MAX16810ATU+T [MAXIM]
LED Driver, 16-Segment, BICMOS, 5 X 7 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WHKD-1, TQFN-38;
| 型号： | MAX16810ATU+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | LED Driver, 16-Segment, BICMOS, 5 X 7 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WHKD-1, TQFN-38 驱动 信息通信管理 接口集成电路 |
| 文件： | 总20页 (文件大小：1533K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
General Description
Features
● 16 Constant-Current Output Channels (Up to 55mA
The MAX16809 is an integrated, high-efficiency white
or RGB LED driver. It is designed for LCD backlighting
and other LED lighting applications with multiple strings
of LEDs. The MAX16809’s current-mode PWM control-
ler regulates the necessary voltage to the LED array.
Depending on the input voltage and LED voltage range,
this device can be used with boost or buck-boost (SEPIC)
topologies.
Each)
● ±3% Current Matching Among Outputs
● Paralleling Channels Allows Higher Current per LED
String
● Outputs Rated for 36V Continuous Voltage
● Output-Enable Pin for PWM Dimming (Up to 30kHz)
● One Resistor Sets LED Current for All Channels
● Wide Dimming Ratio Up to 5000:1
The MAX16809 LED driver includes 16 open-drain,
constant-current-sinking LED driver outputs rated for
36V continuous operation. The LED current-control cir-
cuitry achieves ±3% current matching among strings
and enables paralleling of outputs for LED string cur-
rents higher than 55mA. The output-enable pin is used
for simultaneous PWM dimming of all output channels.
Dimming frequency range is 50Hz to 30kHz and dimming
ratio is up to 5000:1. The constant-current outputs are
single resistor programmable and the LED current can be
adjusted up to 55mA per output channel.
● Low Current-Sense Reference (300mV) for High
Efficiency
● 8V to 26.5V Input Voltage or Higher with External
Biasing Devices
● 4-Wire Serial Interface to Control Individual Output
Channels
Applications
● LCD White or RGB LED Backlighting:
LCD TVs, Desktop, and Notebook Panels
Industrial and Medical Displays
● Ambient, Mood, and Accent Lighting
The MAX16809 operates either in stand-alone mode or
with a microcontroller (µC) using an industry-standard,
4-wire serial interface.
The MAX16809 includes overtemperature protection,
operates over the full -40°C to +125°C temperature range,
and is available in a 5mm x 7mm thermally enhanced,
38-pin TQFN exposed pad package.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX16809ATU+
-40°C to +125°C
38 TQFN-EP*
Pin Configuration appears at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuits
V
IN
V
OUT
L
C
OUT
LEDs
Q1
R1
C
C2
R
CS
C
C1
R
C1
R2
OUT CS AGND
COMP
V
FB
CC
C
IN
3V TO 5.5V
V+
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
C
BYP
PGND
LE
MAX16809
DIN
CLK
DOUT
OE
SET
R
SET
REF
RTCT
STAND-ALONE OPERATION
R
T
C
REF
C
T
Typical Operating Circuits continued at end of data sheet.
19-0656; Rev 3; 4/14
MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Absolute Maximum Ratings
V
to AGND ........................................................-0.3V to +30V
OUT0–OUT15 Sink Current...............................................60mA
CC
Current into V
(V
> 24V) ...........................................30mA
Total PGND Current (1s pulse time) ................................960mA
CC CC
V+ to PGND ............................................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C)
A
OUT to AGND........................................... -0.3V to (V + 0.3V)
38-Pin TQFN (derate 35.7mW/°C* above +70°C).....2857mW
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
OUT Current (10µs duration) ................................................±1A
FB, COMP, CS, RTCT, REF to AGND ....................-0.3V to +6V
COMP Sink Current............................................................10mA
OUT0–OUT15 to PGND........................................-0.3V to +40V
DIN, CLK, LE, OE, SET to PGND...............-0.3V to (V+ + 0.3V)
DOUT Current ..................................................................±10mA
*Per JEDEC51 Standard (Multilayer Board).
Stresses beyond those listed under “bsolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or
any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics (PWM Controller)
(V
= +15V, V+ = +3V to +5.5V referenced to PGND, R = 10kΩ, C = 3.3nF, REF = open, COMP = open, C
= 0.1µF, V = 2V,
CC
T
T
REF FB
CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. T = T = -40°C to +125°C,
J
A
unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
REFERENCE
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Output Voltage
V
I
= 1mA, T = +25°C
4.95
5
0.4
6
5.05
4
V
REF
REF
J
Line Regulation
∆V
12V< V
< 25V, I = 1mA
REF
mV
mV
V
LINE
LOAD
REFT
CC
Load Regulation
∆V
1mA < I
< 20mA
50
REF
Total Output-Voltage Variation
Output Noise Voltage
Output Short-Circuit Current
OSCILLATOR
V
(Note 2)
10Hz < f < 10kHz
= 0V
4.875
30
5.125
V
50
µV
mA
NOISE
I
V
180
SHORT
REF
Initial Accuracy
T = +25°C
51
54
0.2
1
57
kHz
%
%
V
J
Voltage Stability
12V < V
< 25V
0.5
CC
Temperature Stability
RTCT Ramp Peak-to-Peak
RTCT Ramp Valley
1.7
1.1
8.3
8.3
V
V
V
= 2V, T = +25°C
J
7.9
7.5
20
8.7
9.0
RTCT
Discharge Current
I
mA
DIS
o
= 2V, -40 C ≤ T ≤ +125°C
RTCT
J
Frequency Range
f
1000
kHz
OSC
ERROR AMPLIFIER
FB Input Voltage
V
FB shorted to COMP
2.45
2.5
-0.01
100
1
2.55
-0.1
V
µA
dB
MHz
dB
mA
mA
V
FB
I
Input Bias Current
B(FB)
Open-Loop Gain
A
2V ≤ V
≤ 4V
VOL
COMP
Unity-Gain Bandwidth
Power-Supply Rejection Ratio
COMP Sink Current
COMP Source Current
COMP Output-Voltage High
COMP Output-Voltage Low
f
GBW
PSRR
12V ≤ V
≤ 25V
60
2
80
CC
I
V
V
V
V
= 2.7V, V
= 2.3V, V
= 2.3V, R
= 2.7V, R
= 1.1V
6
SINK
FB
FB
FB
FB
COMP
COMP
COMP
COMP
I
= 5V
0.5
5
1.2
5.8
0.1
1.8
1.1
SOURCE
V
= 15kΩ to AGND
OH
V
= 15kΩ to V
V
OL
REF
Maxim Integrated
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Electrical Characteristics (PWM Controller) (continued)
(V
= +15V, V+ = +3V to +5.5V referenced to PGND, R = 10kΩ, C = 3.3nF, REF = open, COMP = open, C
= 0.1µF, V = 2V,
CC
T
T
REF FB
CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. T = T = -40°C to +125°C,
J
A
unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
CURRENT-SENSE AMPLIFIER
Current-Sense Gain
A
(Notes 3, 4)
(Note 3)
2.85
3
3.40
V/V
V
CS
Maximum Current-Sense Signal
Power-Supply Rejection Ratio
Current-Sense Input Bias Current
Current Sense to OUT Delay
MOSFET DRIVER
V
_
0.275 0.300 0.325
70
CS MAX
PSRR
12V ≤ V
≤ 25V
dB
µA
ns
CC
I
V
= 0V
-1
-2.5
CS
COMP
t
50mV overdrive
60
PWM
T = -40°C to +85°C (Note 2)
4.5
4.5
3.5
3.5
2
10
12
7.5
10
J
OUT Low-Side On-Resistance
OUT High-Side On-Resistance
V
_
I
I
= 200mA
Ω
Ω
RDS ONL
SINK
T = -40°C to +125°C
J
T = -40°C to +85°C (Note 2)
J
=
SOURCE
100mA
V
_
RDS ONH
T = -40°C to +125°C
J
Source Current (Peak)
Sink Current (Peak)
Rise Time
I
C
C
C
C
= 10nF
= 10nF
= 1nF
A
A
SOURCE
LOAD
LOAD
LOAD
LOAD
I
1
SINK
t
15
22
ns
ns
R
Fall Time
t
= 1nF
F
UNDERVOLTAGE LOCKOUT/STARTUP
Startup Voltage Threshold
V
_
7.98
7.1
8.4
7.6
0.8
8.82
8.0
V
V
V
CC START
Minimum Operating Voltage After
Turn-On
V
_
CC MIN
Undervoltage-Lockout Hysteresis UVLO
HYST
PULSE-WIDTH MODULATION (PWM)
Maximum Duty Cycle
Minimum Duty Cycle
SUPPLY CURRENT
Startup Supply Current
Operating Supply Current
D
94.5
96
97.5
0
%
%
MAX
D
MIN
I
V
V
= 7.5V
32
3
65
5
µA
mA
V
START
CC
I
= V
= 0V
CC
FB
CS
V
Zener Voltage
V
I = 25mA
CC
24
26.5
CC
Z
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│ 3
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Electrical Characteristics (LED Driver)
(V+ = +3V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. T = T = -40°C
A
J
to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Operating Supply Voltage
Output Voltage
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
V+
3.0
V
V
V
_ _
36
OUT
R
= 360Ω, DIN, LE, CLK = PGND or V+,
Standby Current (Interface Idle, All
Output Ports High Impedance)
SET
3.6
3.8
4.5
mA
OE = V+, DOUT unconnected
Standby Current
(Interface Active, All Output Ports
High Impedance)
R
= 360Ω, f = 5MHz, OE = V+,
SET
CLK
4.8
mA
DIN, LE = PGND or V+, DOUT unconnected
Supply Current
(Interface Idle, All Output Ports
Active Low)
R
= 360Ω, OE = PGND, DIN,
SET
I+
30
52.5
mA
LE = V+, DOUT unconnected
INTERFACE (DIN, CLK, DOUT, LE, OE)
Input-Voltage High
0.7
x V+
V
V
V
IH
(DIN, CLK, LE, OE)
Input-Voltage Low
(DIN, CLK, LE, OE)
0.3
x V+
V
IL
Hysteresis Voltage
(DIN, CLK, LE, OE)
V
0.8
V
HYST
LEAK
Input Leakage Current
(DIN, CLK)
I
-1
+1
µA
OE Pullup Current to V+
I
V+ = 5.5V, OE = PGND
0.25
0.25
1.5
1.5
25
25
µA
µA
OE
LE Pulldown Current to PGND
I
V+ = 5.5V, LE = V+
LE
V+
- 0.5V
Output-Voltage High (DOUT)
Output-Voltage Low (DOUT)
V
I
= 4mA
SOURCE
V
V
OH
V
I = 4mA
SINK
0.5
OL
0°C ≤ T ≤ +125°C, V
= 1V to 2.5V,
A
OUT
43.25 47.5 51.75
R
= 360Ω
SET
OUT_ _ Output Current
OUT_ _ Leakage Current
I
_ _
mA
µA
OUT
T
= -40°C, V
= 1V to 2.5V,
A
OUT
40
55
1
R
= 360Ω
SET
OE = V+
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
5V Timing Characteristics
(V+ = +4.5V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. T = T
=
A
J
-40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1, 5)
A
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX UNITS
INTERFACE TIMING CHARACTERISTICS
CLK Clock Period
t
40
19
19
4
ns
ns
ns
ns
ns
CP
CLK Pulse-Width High
t
CH
CLK Pulse-Width Low
t
CL
DS
DH
DO
DIN Setup Time
t
DIN Hold Time
t
8
DOUT Propagation Delay
DOUT Rise Time
t
10
50
10
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
t
t
C
C
= 10pF, 20% to 80%
= 10pF, 80% to 20%
DR
DF
LW
DOUT
DOUT Fall Time
DOUT
LE Pulse-Width High
t
20
15
LE Setup Time
t
LS
LE Rising to OUT_ _ Rising Delay
LE Rising to OUT_ _ Falling Delay
CLK Rising to OUT_ _ Rising Delay
CLK Rising to OUT_ _ Falling Delay
OE Rising to OUT_ _ Rising Delay
OE Falling to OUT_ _ Falling Delay
OUT_ _ Turn-On Fall Time
OUT_ _ Turn-Off Rise Time
t
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
110
340
110
340
110
340
210
130
LRR
t
LRF
t
CRR
t
CRF
t
OER
t
OEF
t
80% to 20% (Note 6)
20% to 80% (Note 6)
F
t
R
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
3.3V Timing Characteristics
(V+ = +3V to < +4.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. T = T
=
A
J
-40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1, 5)
A
PARAMETERS
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
INTERFACE TIMING CHARACTERISTICS
CLK Clock Period
t
52
24
24
4
ns
ns
ns
ns
ns
CP
CLK Pulse-Width High
t
CH
CLK Pulse-Width Low
t
CL
DS
DH
DO
DIN Setup Time
t
DIN Hold Time
t
8
DOUT Propagation Delay
DOUT Rise Time
t
12
70
12
12
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
t
C
C
= 10pF, 20% to 80%
= 10pF, 80% to 20%
DR
DOUT
DOUT Fall Time
t
DF
DOUT
LE Pulse-Width High
t
20
15
LW
LE Setup Time
t
LS
LE Rising to OUT_ _ Rising Delay
LE Rising to OUT_ _ Falling Delay
CLK Rising to OUT_ _ Rising Delay
CLK Rising to OUT_ _ Falling Delay
OE Rising to OUT_ _ Rising Delay
OE Falling to OUT_ _ Falling Delay
OUT_ _ Turn-On Fall Time
OUT_ _ Turn-Off Rise Time
t
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
140
400
140
400
140
400
275
150
LRR
t
LRF
t
CRR
t
CRF
t
OER
t
OEF
t
80% to 20% (Note 6)
20% to 80% (Note 6)
F
t
R
Note 1: This device is 100% production tested at T = +25°C and +125°C. Limits to -40°C are guaranteed by design.
J
Note 2: Guaranteed by design, not production tested.
Note 3: Parameter is measured at trip point of latch with V = 0V.
FB
Note 4: Gain is defined as A = ∆VCOMP/∆VCS, 0.05V ≤ VCS ≤ 0.25V.
Note 5: See Figures 3 and 4.
Note 6: A 65Ω pullup resistor is connected from OUT_ _ to 5.5V. Rising refers to V
when current through OUT_ _ is turned off
OUT_ _
and falling refers to V
when current through OUT_ _ is turned on.
OUT_ _
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Typical Operating Characteristics
(V
= +15V, V+ = 3V to 5.5V, R = 10kΩ, C = 3.3nF, V
= COMP = open, C = 0.1µF, V = 2V, CS = AGND = PGND = 0V.
REF FB
CC
T
T
REF
Typical values are at T = +25°C, unless otherwise noted.)
A
OPERATING SUPPLY CURRENT
vs. TEMPERATURE AFTER STARTUP
STARTUP CURRENT
vs. TEMPERATURE
(f
= f = 300kHz)
OSC SW
BOOTSTRAP UVLO vs. TEMPERATURE
10
9
41
39
37
35
33
31
29
27
25
5.1
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
C
= 560pF
V
= 7.5V
T
CC
V
RISING
CC
8
7
V
FALLING
CC
6
5
4
3
2
1
0
HYSTERESIS
-40 -25 -10
5 20 35 50 65 80 95 110 125
-40 -25 -10
5 20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
REFERENCE VOLTAGE
vs. TEMPERATURE
5.000
4.998
4.996
4.994
4.992
4.990
4.988
4.986
4.984
4.982
4.980
5.08
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
5.05
5.00
4.95
4.90
4.85
4.80
4.75
4.70
4.65
I
= 1mA
REF
I
= 1mA
REF
I
= 20mA
REF
-40 -25 -10
5 20 35 50 65 80 95 110 125
10 12 14 16 18 20 22 24 26
0
10
20
30
40
50
60
70
TEMPERATURE (°C)
V
CC
(V)
I
(mA)
REF
OSCILLATOR FREQUENCY (f
)
OSCILLATOR R /C DISCHARGE CURRENT
T T
OSC
vs. TEMPERATURE
vs. TEMPERATURE
8.04
8.02
8.00
7.98
7.96
7.94
7.92
7.90
7.88
550
R
T
C
T
= 3.65kΩ
= 560pF
V
= 2V
RT/CT
540
530
520
510
500
490
480
470
460
450
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Typical Operating Characteristics
(V
= +15V, V+ = 3V to 5.5V, R = 10kΩ, C = 3.3nF, V
= COMP = open, C = 0.1µF, V = 2V, CS = AGND = PGND = 0V.
REF FB
CC
T
T
REF
Typical values are at T = +25°C, unless otherwise noted.)
A
CURRENT-SENSE TRIP THRESHOLD
TIMING RESISTANCE
OUT IMPEDANCE vs. TEMPERATURE
vs. TEMPERATURE
vs. OSCILLATOR FREQUENCY
(R
PMOS DRIVER)
DS_ON
1000
100
10
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
0.40
0.38
0.36
0.34
0.32
0.30
0.28
0.26
0.24
0.22
0.20
I
= 100mA
SOURCE
C
= 1nF
T
C
= 560pF
T
C
T
= 220pF
C
T
= 100pF
C
C
= 10nF
= 4.7nF
T
1
T
C
T
= 3.3nF
C
T
= 2.2nF
0.1
-40 -25 -10
5
20 35 50 65 80 95 110 125
10k
100k
1M
10M
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
FREQUENCY (Hz)
TEMPERATURE (°C)
OUT IMPEDANCE vs. TEMPERATURE
PROPAGATION DELAY FROM CURRENT-LIMIT
COMPARATOR TO OUT vs. TEMPERATURE
ERROR-AMPLIFIER OPEN-LOOP GAIN
(R
DS_ON
NMOS DRIVER)
AND PHASE vs. FREQUENCY
MAX16809 toc14
10
9
8
7
6
5
4
3
2
1
0
100
I
= 200mA
10
SINK
140
120
100
80
90
80
70
60
50
40
30
20
10
0
-15
-40
GAIN
-65
PHASE
-90
60
-115
-140
-165
-190
40
20
0
-20
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
0.01
1
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
10M 100M
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY CURRENT
vs. OSCILLATOR FREQUENCY
COMP VOLTAGE LEVEL TO TURN
OFF DEVICE vs. TEMPERATURE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
NTERFACE IDLE, ALL OUTPUTS OFF, R = 720Ω)
SET
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
2.00
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
V
CC
= 15V
C
= 100pF
T
6
= +125°C
A
T
= +85°C
A
1.95
1.90
1.85
1.80
T
= +125°C
A
T
= +25°C
A
T
A
= -40°C
T
A
= -40°C
3.0
3.5
4.0
4.5
5.0
5.5
-40 -25 -10
5
20 35 50 65 80 95 110 125
20 120 220 320 420 520 620 720 820 920 1020
FREQUENCY (kHz)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Typical Operating Characteristics
(V
= +15V, V+ = 3V to 5.5V, R = 10kΩ, C = 3.3nF, V
= COMP = open, C
= 0.1µF, V = 2V, CS = AGND = PGND = 0V.
CC
T
T
REF
REF FB
Typical values are at T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS OFF, R
= 360Ω)
(INTERFACE IDLE, ALL OUTPUTS ON, R
= 720Ω)
SET
SET
3.70
45
40
T
= +85°C
T
A
= +125°C
A
T
A
= +125°C
3.65
3.60
3.55
3.50
T
= +85°C
A
35
30
25
20
15
T
= +25°C
A
T
A
= -40°C
T
= +25°C
5.0
A
T
= -40°C
4.5
A
3.0
3.5
4.0
4.5
5.0
5.5
3.0
3.5
4.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
OUT_ _ CURRENT vs. OUT_ _ VOLTAGE
(R = 720, V+ = 3.3V)
(INTERFACE IDLE, ALL OUTPUTS ON, R
= 360Ω)
SET
SET
45
30
25
20
15
10
5
T
= -40°C
A
40
T
= +85°C
A
T
= +125°C
A
35
30
25
20
15
T
T
= +25°C
= +85°C
A
A
T
= +125°C
A
T
= +25°C
5.0
A
T
A
= -40°C
4.0
0
3.0
3.5
4.5
5.5
0
0.5
1.0
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
OUT_ _ VOLTAGE (V)
OUT_ _ CURRENT vs. OUT_ _ VOLTAGE
(R = 360Ω, V+ = 3.3V)
OUT_ _ CURRENT vs. OUT_ _ VOLTAGE
(R = 720Ω, V+ = 5.0V)
SET
SET
60
50
40
30
20
10
0
30
25
20
15
10
5
T
A
= -40°C
T
= -40°C
A
T
= +25°C
A
T
= +25°C
= +85°C
A
T
= +85°C
T
A
A
T
= +125°C
T
= +125°C
A
A
0
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
OUT_ _ VOLTAGE (V)
OUT_ _ VOLTAGE (V)
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Typical Operating Characteristics
(V
= +15V, V+ = 3V to 5.5V, R = 10kΩ, C = 3.3nF, V
= COMP = open, C = 0.1µF, V = 2V, CS = AGND = PGND = 0V.
REF FB
CC
T
T
REF
Typical values are at T = +25°C, unless otherwise noted.)
A
OUT_ _ CURRENT vs. OUT_ _ VOLTAGE
OUT_ _ CURRENT vs. V+
(R
SET
= 360Ω, V+ = 5.0V)
(R
SET
= 720Ω, V
= 2V)
OUT
60
50
40
30
20
10
0
25.0
T
= -40°C
A
24.5
24.0
23.5
23.0
T
= +85°C
A
T
= +125°C
T
= +25°C
A
A
T
= +85°C
A
T
= +125°C
T
A
= +25°C
A
TA = -40°C
0
0.5
1.0
1.5
2.0
2.5
3.0
3.0
3.5
4.0
4.5
5.0
5.5
OUT_ _ VOLTAGE (V)
SUPPLY VOLTAGE (V)
OUT_ _ CURRENT vs. V+
OUT_ _ CURRENT vs. SET RESISTANCE
(V+ = 5.0V)
(R
SET
= 360Ω, V
= 2V)
OUT
49
48
47
46
50
40
30
20
10
0
T
= +25°C
A
T
= -40°C
A
T
= +85°C
A
T
= +125°C
3.5
A
3.0
4.0
4.5
5.0
5.5
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
SET RESISTANCE (kΩ)
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Pin Description
PIN
NAME
FUNCTION
1, 31, 32,
36, 38
N.C.
No Connection. Not internally connected. Leave unconnected.
2
3
FB
Error-Amplifier Inverting Input
Error-Amplifier Output
COMP
4–11
OUT8–OUT15 LED Driver Outputs. OUT8–OUT15 are open-drain, constant-current-sinking outputs rated for 36V.
Active-Low, Output Enable Input. Drive OE low to PGND to enable the OUT0–OUT15. Drive OE
12
13
OE
high to disable OUT0–OUT15.
Serial-Data Output. Data is clocked out of the 16-bit internal shift register to DOUT on CLK’s
rising edge.
DOUT
14
15
SET
V+
LED Current Setting. Connect R
from SET to PGND to set the LED current.
SET
LED Driver Positive Supply Voltage. Bypass V+ to PGND with a 0.1µF ceramic capacitor.
16, 17
18
PGND
DIN
Power Ground
Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
Serial-Clock Input
19
CLK
Latch-Enable Input. Data is loaded transparently from the internal shift register(s) to the output
latch(es) while LE is high. Data is latched into the output latch(es) on LE’s falling edge, and retained
while LE is low.
20
LE
21–28
29
OUT0–OUT7 LED Driver Outputs. OUT0–OUT7 are open-drain, constant-current-sinking outputs rated for 36V.
PWM Controller Timing Resistor/Capacitor Connection. A resistor R from RTCT to REF and a
T
RTCT
capacitor C from RTCT to AGND set the oscillator frequency.
T
30
33
34
CS
PWM Controller Current-Sense Input
AGND
OUT
Analog Ground
MOSFET Driver Output OUT. Connects to the gate of the external n-channel MOSFET.
Power-Supply Input. Bypass V
to AGND with a 0.1µF ceramic capacitor or a parallel combination
CC
35
37
—
V
CC
of a 0.1µF and a higher value ceramic capacitor.
REF
EP
5V Reference Output. Bypass REF to AGND with a 0.1µF ceramic capacitor.
Exposed Paddle. Connect to the ground plane for improved power dissipation. Do not use as the
only ground connection.
current-sensing feedback circuitry (not simple current
mirrors) to ensure very small current variations over
Detailed Description
The MAX16809 LED driver includes an internal switch-
mode controller that can be used as a boost or buck-boost
(SEPIC) converter to generate the voltage necessary to
drive the multiple strings of LEDs. This device incorpo-
rates an integrated low-side driver, a programmable oscil-
lator (20kHz to 1MHz), an error amplifier, a low-voltage
(300mV) current sense for higher efficiency, and a 5V
reference to power up external circuitry (see Figures 1a
and 1b).
the full allowed range of output voltage (see the Typical
Operating Characteristics). The 4-wire serial interface
comprises a 16-bit shift register and a 16-bit transpar-
ent latch. The shift register is written through a clock
input, CLK, and a data input, DIN, and the data propa-
gates to a data output, DOUT. The data output allows
multiple drivers to be cascaded and operated together.
The contents of the 16-bit shift register are loaded into
the transparent latch through a latch-enable input, LE.
The latch is transparent to the shift register outputs
when high and latches the current state on the falling
edge of LE. Each driveoutput is an open-drain, con-
stant-current sink that should be connected to the
The MAX16809 LED driver includes a 4-wire serial
interface and a current-mode PWM controller to gen-
erate the necessary voltage for driving 16 open-drain,
constant-current-sinking output ports. The driver uses
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
cathode of a string of LEDs connected in series. The
constant-current capability is up to 55mA per output,
The number of channels can be expanded by using the
MAX6970 and MAX6971 family in conjunction with the
MAX16809.
set for all 16 outputs by an external resistor, R
. The
SET
device can operate in a stand-alone mode (see the
Typical Operating Circuits).
UVLO
VOLTAGE-
DIVIDER
REFERENCE
2.5V
PREREG
5V
V
CC
26.5V
THERMAL
SHUTDOWN
VDD
EN_REF
MAX16809
REF
BG
5V REG
SNS
REG_OK
DELAY
VOLTAGE
DIVIDER
AGND
V
CC
300mV
I
LIM
OUT
S
R
Q
CS
CPWM
2R
VEA
CLK
FB
COMP
R
OSC
Q
RTCT
CLK
DIN
SERIAL-TO-PARALLEL SHIFT REGISTER
DOUT
V+
D0
D0
D1
D1
D2
D2
D3
D3
D4
D4
D5
D5
D6
D6
D7
D8
D9
D9
D10
D10
D11
D11
D12
D12
D13
D13
D14
D14
D15
D15
OUTPUT LATCHES
POWER-ON
RESET
LE
D7
D8
OE
V+
CONSTANT-CURRENT SINK
CURRENT
REFERENCE
THERMAL
SHUTDOWN
SET
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
PGND
Figure 1a. Internal Block Diagram
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
typically 4.5Ω. The driver can source 2A and sink 1A typi-
cally. This allows for the MAX16809 to quickly turn on and
V+
off high gate-charge MOSFETs. Bypass V
with one or
CC
more 0.1µF ceramic capacitors to AGND, placed close to
. The average current sourced to drive the external
MAX16809
V
68W/L
W/L
CC
OUT_ _
MOSFET depends on the total gate charge (QG) and
operating frequency of the converter. The power dissipa-
tion in the MAX16809 is a function of the average output
1.23
R
EST
1.23V
945R
drive current (I
). Use the following equation to cal-
DRIVE
culate the power dissipation in the device due to I
:
DRIVE
R
I
= (Q x f
)
DRIVE
G
SW
PD = (I
+ I ) x V
DRIVE
CC CC
SET
PGND
where I
is the operating supply current. See the
CC
Typical Operating Characteristics for the operating supply
current at a given frequency.
Figure 1b. OUT_ _ Driver Internal Diagram
Switch-Mode Controller
Error Amplifier
The MAX16809 includes an internal error amplifier. The
inverting input is at FB and the noninverting input is
internally connected to a 2.5V reference. Set the output
voltage using a resistive divider between output of the
Current-Mode Control Loop
The advantages of current-mode control over volt-
age-mode control are twofold. First, there is the feed-for-
ward characteristic brought on by the controller's ability
to adjust for variations in the input voltage on a cycle-by-
cycle basis. Second, the stability requirements of the cur-
rent-mode controller are reduced to that of a single-pole
system unlike the double pole in the voltage-mode control
scheme. The MAX16809 uses a current-mode control
loop where the output of the error amplifier is compared to
converter V
, FB, and AGND. Use the following for-
OUT
mula to set the output voltage:
R1
V
= 1 +
x V
FB
OUT
R2
where V = 2.5V.
FB
the current-sense voltage (V ). When the current-sense
CS
signal is lower than the inverting input of the CPWM com-
parator, the output of the comparator is low and the switch
is turned on at each clock pulse. When the current-sense
signal is higher than the inverting input of the CPWM
comparator, the output is high and the switch is turned off.
Oscillator
The oscillator frequency is programmable using an exter-
nal capacitor and a resistor at RTCT (see R and C
in the Typical Operating Circuits). R is connected from
T
T
T
RTCT to the 5V reference (REF), and C is connected
T
from RTCT to AGND. REF charges C through R until
T
T
Undervoltage Lockout (UVLO)
The turn-on supply voltage for the MAX16809 is 8.4V
its voltage reaches 2.8V. C then discharges through an
T
8.3mA internal current sink until C 's voltage reaches
T
(typ). Once V
reaches 8.4V, the reference powers up.
CC
1.1V, at which time C is allowed to charge through R
T
T
There is a 0.8V of hysteresis from the turn-on voltage
to the UVLO threshold. Once V reaches 8.4V, the
again. The oscillator's period is the sum of the charge
CC
and discharge times of C . Calculate the charge time as
T
MAX16809 operates with V
down to 7.6V. Once V
CC
CC
follows:
goes below 7.6V (typ), the device is in UVLO. When in
UVLO, the quiescent supply current into V falls back to
t
= 0.57 x R x C
T T
C
CC
32µA (typ), and OUT and REF are pulled low.
where t is in seconds, R in ohms (Ω), and C in
C
T
T
Farads (F).
MOSFET Driver
The discharge time is then:
OUT drives an external n-channel MOSFET and swings
from AGND to V . Ensure that V remains below the
t
D
= (R x C x 1000) / [(4.88 x R ) - (1.8 x 1000)]
T T T
CC
CC
absolute maximum V
OUT is a push-pull output with the on-resistance of the
pMOS typically 3.5Ω and the on-resistance of the nMOS
rating of the external MOSFET.
GS
where t is in seconds, R in ohms (Ω), and C in
Farads (F).
D
T
T
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
The oscillator frequency is then:
V
CS
R
CS
=
I
1
P−P
f
=
OSC
t
+ t
(
)
D
C
I
is the peak current that flows through the MOSFET.
P-P
Reference Output
REF is a 5V reference output that can source 20mA.
Bypass REF to AGND with a 0.1µF capacitor.
When the voltage produced by this current (through the
current-sense resistor) exceeds the current-limit com-
parator threshold, the MOSFET driver (OUT) turns the
switch off within 60ns. In most cases, a small RC filter is
required to filter out the leading-edge spike on the sense
waveform. Set the time constant of the RC filter at 50ns.
Current Limit
The MAX16809 includes a fast current-limit comparator
to terminate the ON cycle during an overload or a fault
Buck-Boost (SEPIC) Operation
condition. The current-sense resistor, R , connected
between the source of the external MOSFET and
AGND, sets the current limit. The CS input has a volt-
CS
Figure 2 shows a buck-boost application circuit using
the MAX16809 in a stand-alone mode of operation.
SEPIC topology is necessary when the total forward
age trip level (V ) of 0.3V. Use the following equation
CS
to calculate R
:
voltage of the LEDs in a string is such that V
can be
CS
OUT
below or above V .
IN
V
V
OUT
IN
C
1
L1
D
C
OUT
L2
Q1
R1
C
C2
R
CS
C
C1
R
C1
R2
OUT CS AGND
COMP
V
FB
CC
C
IN
3V TO 5.5V
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
V+
C
BYP
PGND
MAX16809
DIN
LE
EXTERNAL
CLOCK INPUT
CLK
DOUT
OE
EXTERNAL
DIM INPUT
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
SET
RTCT
REF
R
T
R
SET
C
REF
C
T
Figure 2. Buck-Boost (SEPIC) Operation
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
LE is the latch-enable input of the MAX16809 that trans-
fers data from the 16-bit shift register to its 16-bit output
latches (transparent latch). The data latches on the
falling edge of LE (Figure 4). The fourth input (OE) pro-
vides output-enable control of the output drivers. When
OE is driven high, the outputs (OUT0–OUT15) are forced
to high impedance without altering the contents of the
output latches. Driving OE low enables the outputs to fol-
low the state of the output latches. OE is independent of
the serial interface operation. Data can be shifted into
the serial-interface shift register and latched, regardless
of the state of OE. DOUT is the serial-data output that
shifts data out from the MAX16809's 16-bit shift regis-
ter on the rising edge of CLK. Data at DIN propagates
through the shift register and appears at DOUT 16 clock
cycles later. Table 1 shows the 4-wire serial-interface truth
table.
LED Driver
4-Wire Interface
The MAX16809 also operates in a stand-alone mode (see
the Typical Operating Circuits). For use with a microcon-
troller, the MAX16809 features a 4-wire serial interface
using DIN, CLK, LE, OE inputs and DOUT as a data
output. This interface is used to write the LED channels?
data to the MAX16809. The serial-interface data word
length is 16 bits, D0?D15. See Figure 3.
The functions of the five interface pins are as follows:
DIN is the serial-data input, and must be stable when it
is sampled on the rising edge of CLK. Data is shifted in
MSB first. This means that data bit D15 is clocked in first,
followed by 15 more data bits, finishing with the LSB, D0.
CLK is the serial-clock input that shifts data at DIN into the
MAX16809's 16-bit shift register on its rising edge.
Table 1. 4-Wire Serial-Interface Truth Table
SERIAL
CLOCK
INPUT
LOAD
INPUT
BLANKING
INPUT
OUTPUT CONTENTS
CURRENT AT OUT_ _
SHIFT REGISTER CONTENTS
LATCH CONTENTS
DATA
INPUT
DIN
CLK
D0 D1 D2
…
…
…
…
…
…
Dn-1
Dn
LE
D0 D1 D2
…
Dn-1 Dn
OE
D0 D1 D2
…
Dn-1 Dn
H
L
H
L
R0 R1
R0 R1
Rn-2 Rn-1
Rn-2 Rn-1
X
R0 R1 R2
Rn-1
X
Rn
X
X
X
X
L
R0 R1 R2
P0 P1 P2
…
…
…
Rn-1 Rn
Pn-1 Pn
P0 P1 P2
Pn-1
Pn
H
L
P0 P1 P2
…
…
Pn-1 Pn
X
X
X
X
X
H
L
L
L
L
L
L = Low Logic Level
H = High Logic Level
X = Don't Care
P = Present State (Shift Register)
R = Previous State (Latched)
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
LE
CLK
t
LW
t
t
CH
CL
t
LS
t
CP
t
DH
t
DS
D15
D14
D1
D0
DIN
t
DO
D15
DOUT
OE
t
OEW
t
t
OEF
OER
80%
20%
OUT_ _
t
t
F
R
Figure 3. 4-Wire Serial-Interface Timing Diagram
Selecting External Component
RSET to Set LED Output Current
The MAX16809 uses an external resistor, R
LE
t
LRF
, to set
SET
OUT_ _
the LED current for outputs OUT0–OUT15. The minimum
allowed value of R is 311Ω, which sets the output
SET
currents to 55mA. The maximum allowed value of R
is
SET
LE
t
5kΩ (I _ _ = 3.6mA) and the maximum allowed capac-
OUT
LRR
itance at SET is 100pF.
OUT_ _
Use the following formula to set the output current:
CLK
17,100V
t
CRF
R
SET
=
OUT_ _
I
OUT_ _
where I
_ _ is the desired output current in milliamps
OUT
CLK
and the value for R
is in ohms.
t
CRR
SET
OUT_ _
Overtemperature Cutoff
The MAX16809 contains an internal temperature sen-
sor that turns off all outputs when the die temperature
exceeds +165°C. The outputs are enabled again when
the die temperature drops below +140°C. Register con-
tents are not affected, so when a driver is overdissipating,
the external symptom is the load LEDs cycling on and off
as the driver repeatedly overheats and cools, alternately
turning itself off and then back on again.
Figure 4. LE and CLK to OUT_ _ Timing
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
where:
Stand-Alone Operation
In stand-alone operation, the MAX16809 does not use
the 4-wire interface (see the Typical Operating Circuits).
Connect DIN and LE to V+ and provide at least 16
external clock pulses to CLK to enable 16 output ports.
This startup pulse sequence can be provided either using
an external clock or the PWM signal. The external clock
can also be generated using the signal at RTCT and an
external comparator.
V+ = supply voltage
I+ = V+ operating supply current
DUTY = PWM duty cycle applied to OE
V
= MAX16809 port output voltage when driving load
OUTi
LED(s)
IOUTi = LED drive current programmed by R
PD = power dissipation
SET
LED Dimming
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching
losses and clean, stable operation. Use a multilayer board
whenever possible for better noise immunity. Protect
sensitive analog grounds by using a star ground con-
figuration. Minimize ground noise by connecting AGND,
PGND, the input bypass-capacitor ground lead, and the
output-filter ground lead to a single point (star ground con-
figuration). Also, minimize trace lengths to reduce stray
capacitance, trace resistance, and radiated noise. The
trace between the output voltage-divider and the FB pin
must be kept short, as well as the trace between AGND
and PGND.
PWM Dimming
All the output channels can be dimmed simultaneously
by applying a PWM signal (50Hz to 30kHz) to OE. This
allows for a wide range of dimming up to a 5000:1 ratio.
Each channel can be independently turned on and off
using a 4-wire serial interface. The dimming is proportion-
al to the PWM duty cycle.
LED Current Amplitude Adjustment
Using an analog or digital potentiometer as RSET allows
for LED current amplitude adjustment and linear dimming.
Computing Power Dissipation
Use the following equation to estimate the upper limit
power dissipation (PD) for the MAX19:
i =15
∑
PD = DUTY × (V+ x I+) +
V
x I
OUTi OUTi
i = 0
+ (V
x I
CC CC
)
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MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Typical Operating Circuits (continued)
V
V
IN
OUT
L
D
LEDs
C
OUT
R1
C
C2
R
CS
C
C1
R
C1
R2
OUT CS AGND
COMP
V
FB
CC
C
IN
3V TO 5.5V
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
V+
C
BYP
PGND
MAX16809
SCLK
CLK
DIN
DOUT
LE
MOSI
MISO
µC
LOAD
ENABLE
OE
SET
REF
RTCT
OPERATION WITH MICROCONTROLLER
R
T
R
SET
C
REF
C
T
Maxim Integrated
│ 18
www.maximintegrated.com
MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Pin Configuration
Chip Information
PROCESS: BiCMOS
TOP VIEW
31 30 29 28 27 26 25 24 23 22 21 20
N.C. 32
AGND 33
OUT 34
19 CLK
Package Information
18 DIN
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
17 PGND
16 PGND
V
35
36
CC
MAX16809
N.C.
V+
15
14 SET
13
REF 37
38
N.C.
DOUT
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
+
1
2
3
4
5
6
7
8
9
10 11 12
38 TQFN-EP
T3857M+1
21-0172
90-0007
TQFN
Maxim Integrated
│ 19
www.maximintegrated.com
MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Revision History
REVISION REVISION
PAGES
DESCRIPTION
NUMBER
DATE
10/06
3/07
CHANGED
0
1
2
3
Initial release
—
Released the MAX16810 on the data sheet.
Removed the MAX16810 from the data sheet.
No /V OPNs; removed Automotive reference from Applications section
1, 14, 16, 22, 23
8/09
1–20
1
4/14
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2014 Maxim Integrated Products, Inc.
│ 20
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