SGM3735 [SGMICRO]
One-Wire Dimming, 38V Boost LED Driver;
| 型号： | SGM3735 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | One-Wire Dimming, 38V Boost LED Driver |
| 文件： | 总10页 (文件大小：642K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM3735
One-Wire Dimming, 38V Boost LED Driver
GENERAL DESCRIPTION
FEATURES
The SGM3735 is a high efficiency constant current LED
driver with a 1MHz PWM boost converter. An internal
low-side N-channel MOSFET and a high switching
frequency make the SGM3735 easy to use small
components and optimized for compact solutions.
● Input Voltage Range: 2.7V to 5.5V
● Support up to 10 LEDs in Series
● Integrated 40V/1.35A Switch
● High Efficiency PWM Boost Converter
● Low Feedback Voltage: 200mV
● 500kΩ Pull-Down Resistor on EN/SET Pin
● One-Wire Dimming Interface
The SGM3735 is capable of driving either up to 10
LEDs in series for 38V output or total 260mA current
with 3 LEDs in series per string while achieving high
conversion efficiency.
● Switching Frequency: 1MHz
● 38V LED Open Protection
● Automatic Soft-Start for Reducing Inrush Current
● Less than 1µA Shutdown Current
● -40℃ to +85℃ Operating Temperature Range
● Available in a Green TSOT-23-6 Package
32-step FB reference voltage can be programmed by
one-wire dimming interface. Compared to normal PWM
dimming control, it can avoid audible noise and reduce
inrush current.
The SGM3735 provides very low shutdown current. It
also includes a comprehensive set of protection
features such as over-voltage protection, cycle-by-
cycle input current limit and thermal shutdown.
APPLICATIONS
LED Backlighting
Mobile Phones and Digital Photo Frames
Portable Devices
The SGM3735 is available in a Green TDFN-2×2-8L
package. It operates over an ambient temperature
range of -40℃ to +85℃.
Automotive Navigation
SG Micro Corp
JULY 2014–REV. A.1
www.sg-micro.com
SGM3735
One-Wire Dimming, 38V Boost LED Driver
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
3735
XXXX
SGM3735
TDFN-2×2-8L
SGM3735YTDE8G/TR
Tape and Reel, 3000
-40℃ to +85℃
MARKING INFORMATION
NOTE: XXXX = Date Code.
X X X X
Date Code - Week
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
Input Voltage, VIN................................................. -0.3V to 6V
High Voltage Nodes, SW, VOUT ....................... -0.3V to 40V
Other Pins, FB, EN/SET ...........................-0.3V to VIN + 0.3V
Package Thermal Resistance
TDFN-2×2-8L, θJA...................................................... 75℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................3000V
MM.................................................................................200V
RECOMMENDED OPERATING CONDITIONS
Operating Temperature Range .......................-40℃ to +85℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
JULY 2014
2
SGM3735
One-Wire Dimming, 38V Boost LED Driver
PIN CONFIGURATION
(TOP VIEW)
PGND
VIN
1
2
3
4
8
7
6
5
SW
VOUT
FB
EN/SET
GND
RSET
TDFN-2×2-8L
PIN DESCRIPTION
PIN
1
NAME
PGND
VIN
FUNCTION
Power Ground Pin.
Input Supply Pin.
Enable Control and One-Wire Dimming Interface. Pull it high to enable the device and pull it low for
2
3
EN/SET 3ms to shut down the device. Apply an input pulse signal to this pin for LED brightness control. The
32-step LED current control can be programmed by EN/SET pin.
4
5
GND
Ground Pin.
Current Setting Pin. Connect an external resistor from RSET pin to ground to program the maximum
white LED current.
RSET
6
7
8
FB
VOUT
SW
Feedback Input for Current. It is regulated at 200mV.
Output Voltage Pin.
Boost Converter Switching Node.
Exposed
Pad
GND
Exposed Pad. It should be soldered to PCB board and connected to GND.
TYPICAL APPLICATION
L
D1
Up to 38V Output
Input Range
2.7V ~ 5.5V
2
3
8
7
VIN
SW
VOUT
COUT
CIN
Up to 10 in series
or up to 10S4P
SGM3735
6
5
FB
1kΩ
CTRL
RSET
Brightness Control
RSET
PGND
RSET
GND
4
1
SG Micro Corp
www.sg-micro.com
JULY 2014
3
SGM3735
One-Wire Dimming, 38V Boost LED Driver
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, L = 10μH, CIN = 10μF, COUT = 0.47μF, Full = -40℃ to +85℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
IC Supply
Input Voltage Range
VIN
Full
2.7
5.5
2.6
V
V
Input Under-Voltage Lockout
UVLO Hysteresis
UVLO
VHYS
Rising edge
2.5
0.15
0.20
0.72
0.1
+25℃
+25℃
+25℃
+25℃
+25℃
V
Quiescent Current (Non Switching)
Operating Current (Switching)
VIN Pin Shutdown Current
Step-Up Converter
VFB = 0.4V
VFB = 0V
VEN = 0V
0.35
1.20
1
mA
mA
μA
IQ
ISHDN
Voltage Feedback Regulation Voltage
NMOS On-Resistance
VREF
RDS(ON)
ISW
Full
+25℃
+25℃
+25℃
Full
192
200
0.36
0.01
1.35
1.0
212.5
0.55
1
mV
Ω
SW Pin Leakage Current
Peak NMOS Current Limit
Oscillator Frequency
μA
A
ILIM
1.0
0.8
92
1.7
fS
1.22
MHz
%
Maximum Duty Cycle
DMAX
VOVP
tS
95
+25℃
Full
Over-Voltage Threshold
Measured at VOUT pin
35.5
38
40.5
0.35
750
V
Start-Up Time
800
μs
+25℃
Control
Logic Low Threshold
VIL
VIH
Full
V
V
Logic High Threshold
Full
1.5
0.4
0.4
3
Minimum Logic High Pulse Width Timing
Logic Low Pulse Width Timing
Minimum Shutdown Pulse Width Timing
Junction Thermal Shutdown Threshold
Junction Thermal Shutdown Hysteresis
tHIGH_MIN
tLOW
μs
μs
ms
℃
℃
+25℃
+25℃
+25℃
tOFF
150
15
NOTE:
1. The SGM3735 is guaranteed to meet performance specifications over the -40℃ to +85℃ operating temperature range by
design, characterization and correlation with statistical process controls.
SG Micro Corp
www.sg-micro.com
JULY 2014
4
SGM3735
One-Wire Dimming, 38V Boost LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
TA = +25℃, L = 10μH, CIN = 10μF, COUT = 0.47μF, unless otherwise noted.
Feedback Voltage vs. Input Voltage
Feedback Voltage vs. Temperature
215
210
205
200
195
190
185
215
210
205
200
195
190
185
VIN = 3.6V
2.5
3
3.5
4
4.5
5
5.5
-50
-25
0
25
50
75
100
Input Voltage (V)
Temperature (℃)
Efficiency vs. Input Voltage
LED = 20mA, L = 10μH
Efficiency vs. Input Voltage
90
88
86
84
82
80
90
88
86
84
82
80
I
ILED = 20mA, L = 22μH
10 LEDs
5
10 LEDs
5
2.5
3
3.5
4
4.5
5.5
2.5
3
3.5
4
4.5
5.5
Input Voltage (V)
Input Voltage (V)
Switching Waveform
Efficiency vs. Output Current
VIN = 3.6V, L = 10μH
100
90
80
70
60
50
VSW
AC Coupled
VOUT
10 LEDs
25
IL
VIN = 3.6V, ILED = 20mA, L=10μH, 8 LEDs
Time (1μs/div)
0
5
10
15
20
30
Output Current (mA)
SG Micro Corp
www.sg-micro.com
JULY 2014
5
SGM3735
One-Wire Dimming, 38V Boost LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TA = +25℃, L = 10μH, CIN = 10μF, COUT = 0.47μF, unless otherwise noted.
Open LED Protection
Start-Up
VFB
VEN
VOUT
VOUT
VIN = 3.6V, ILED = 20mA, L = 10μH, 8 LEDs
Time (100μs/div)
VIN = 3.6V, ILED = 20mA, L = 10μH, 8 LEDs
Time (400μs/div)
SG Micro Corp
www.sg-micro.com
JULY 2014
6
SGM3735
One-Wire Dimming, 38V Boost LED Driver
DETAILED DESCRIPTION
Table 1. Current Setting
DATA
LED Current Ratio
32/32
DATA
9
LED Current Ratio
24/32
DATA
17
LED Current Ratio
16/32
DATA
25
LED Current Ratio
1
2
3
4
5
6
7
8
8/32
7/32
6/32
5/32
4/32
3/32
2/32
1/32
31/32
10
23/32
18
15/32
26
30/32
11
22/32
19
14/32
27
29/32
12
21/32
20
13/32
28
28/32
13
20/32
21
12/32
29
27/32
14
19/32
22
11/32
30
26/32
15
18/32
23
10/32
31
25/32
16
17/32
24
9/32
32
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
JULY 2014 ‒ REV.A to REV.A.1
Page
Changed GENERAL DESCRIPTION section.......................................................................................................................................................1
Changed Figure 1................................................................................................................................................................................................9
Changes from Original (MARCH 2014) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JULY 2014
7
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-2×2-8L
D
e
N8
E1
D1
L
E
k
N4
N1
b
BOTTOM VIEW
TOP VIEW
1.20
0.65
0.60 1.95
A
A1
A2
SIDE VIEW
0.24
0.50
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
0.800
0.050
MIN
0.028
0.000
MAX
0.031
0.002
A
A1
A2
D
0.700
0.000
0.203 REF
0.008 REF
1.900
1.100
1.900
0.500
2.100
1.300
2.100
0.700
0.075
0.043
0.075
0.020
0.083
0.051
0.083
0.028
D1
E
E1
k
0.200 MIN
0.500 TYP
0.008 MIN
0.020 TYP
b
0.180
0.250
0.300
0.450
0.007
0.010
0.012
0.018
e
L
SG Micro Corp
www.sg-micro.com
TX00056.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
TDFN-2×2-8L
7″
9.5
2.30
2.30
1.10
4.0
4.0
2.0
8.0
Q1
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
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