FAN5341UMPX [ONSEMI]
LED 驱动器，串联升压，带集成式肖特基二极管和单线数字接口;
| 型号： | FAN5341UMPX |
| 厂家： | 
ONSEMI |
| 描述： | LED 驱动器，串联升压，带集成式肖特基二极管和单线数字接口 驱动 光电二极管 接口集成电路 肖特基二极管 驱动器 |
| 文件： | 总11页 (文件大小：364K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LED Driver, Series Boost,
with Integrated Schottky
Diode and Single-Wire
Digital Interface
FAN5341
Description
www.onsemi.com
The FAN5341 is an asynchronous constant−current LED driver
capable of efficiently delivering up to 500 mW to a string of up to five
LEDs in series. Optimized for small form−factor applications,
the 1.2 MHz fixed switching frequency allows the use of small chip
inductors and capacitors.
The FAN5341 uses a simple single−wire digital control interface
to program the brightness levels of the LEDs in 32 linear steps by
applying digital pulses.
For safety, the device features integrated over−voltage,
over−current, short−circuit detection, and thermal−shutdown
protection. In addition, input under−voltage lockout protection is
triggered if the battery voltage is too low.
UDFN6 2 x 2, 0.65P
CASE 517DS
MARKING DIAGRAM
&Z&2&K
341
The FAN5341 is available in a very low profile, small form−factor
2 mm x 2 mm x 0.55 mm 6−lead UMLP package that is green
and RoHS compliant.
&Z
&2
&K
341
= Assembly Plant Code
= 2−Digit Date Code
= Lot Code
= Specific Device Code
Features
• Asynchronous Boost Converter
• Internal Schottky Diode
• Up to 500 mW Output Power
• Drives 3 to 5 LEDs in Series
ORDERING INFORMATION
See detailed ordering and shipping information on page 2 of
this data sheet.
• 2.7 V to 5.5 V Input Voltage Range
• Single−Wire Digital Control Interface to Set LED Brightness Levels
♦ 32 Linear Steps
• 1.2 MHz Fixed Switching Frequency
• Soft−Start Capability
• Input Under−Voltage Lockout (UVLO)
• Output Over−Voltage Protection (OVP)
• Short−Circuit Detection
• Thermal Shutdown (TSD) Protection
• Low Profile 6−lead 2.0 x 2.0 x 0.55 mm UMLP Package
• This Device is Pb−Free, Halogen Free/BFR Free and is RoHS
Compliant
Applications
• Cellular Mobile Handsets
• Mobile Internet Devices
• Portable Media Players
• PDA, DSC, MP3 Players
© Semiconductor Components Industries, LLC, 2009
1
Publication Order Number:
January, 2021 − Rev. 3
FAN5341/D
FAN5341
Table 1. ORDERING INFORMATION
†
Part Number
Temperature Range
−40°C to 85°C
Package
6−lead, 2.0 x 2.0 mm UMLP
Packing Method
FAN5341UMPX
3000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
TYPICAL APPLICATION DIAGRAM
L = 10 mH
VIN
SW
2.7 V to 5.5 V
2
6
3
5
1
4
FAN5341
C
= 1 mF
IN
VOUT
GND
EN
C
= 1 mF
OUT
FB
3−5 LEDs
R
R
= 12.7 W @ ILED = 20 mA
= 10.0 W @ ILED = 25 mA
SET
SET
Figure 1. Typical Application
BLOCK DIAGRAM
5
1
SW
VIN
2
D1
GATE
DRIVE
VOUT
GND
6
BOOST
CONTROL
OVP/
SCD
3
4
FB
EN
Digital I/F
Figure 2. Functional Block Diagram
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2
FAN5341
PIN CONFIGURATION
1
2
3
6
5
4
VOUT
VIN
GND
SW
FB
P1
GND
EN
Figure 3. UMLP6 Package (Top View)
Table 2. PIN DEFINITIONS
Pin #
Name
Description
Boost Output Voltage. Output of the boost regulator. Connect the LEDs to this pin. Connect
1
VOUT
C
(Output Capacitor) to GND.
OUT
2
3
4
VIN
EN
FB
Input Voltage. Connect to power source and decouple with C to GND.
IN
Enable Brightness Control. Program dimming levels by driving pin with digital pulses.
Voltage Feedback. The boost regulator regulates this pin to 0.253 V to control the LED
string current. Tie this pin to a current setting resistor (R ) between GND and the cathode
SET
of the LED string.
5
6
SW
Switching node. Tie inductor L1 from VIN to SW pin.
Ground. Tie directly to a GND plane.
GND
Table 3. ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Min.
Max.
Units
6.0
V
VIN Pin
−0.3
–0.3
−0.3
−0.3
V
IN
V
+ 0.3
V
, V
FB, EN Pins
SW Pin
V
V
IN
FB
EN
22.0
22.0
V
SW
V
OUT
VOUT Pin
V
ESD
Electrostatic Discharge Protection
Level
Human Body Model per JESD22−A114
Charged Device Model per JESD22−C101
3.3
2.0
kV
T
Junction Temperature
–40
–65
+150
+150
+260
°C
°C
°C
J
T
Storage Temperature
STG
T
L
Lead Soldering Temperature, 10 Seconds
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
Table 4. RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Supply Voltage
Min.
2.7
6.2
5
Max.
5.5
Units
V
V
IN
V
IN
V
VOUT Voltage (Note 1)
VOUT Load Current
Ambient Temperature
Junction Temperature
17.5
25
V
OUT
OUT
I
500 mW Maximum Output Power
mA
°C
T
A
–40
–40
+85
+125
T
J
°C
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
1. Application should guarantee that minimum and maximum duty−cycle should fall between 20−85% to meet the specified range.
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3
FAN5341
Table 5. THERMAL PROPERTIES
Symbol
Parameter
Typical
Units
θ
JA
Junction−to−Ambient Thermal Resistance, UMLP6 Package
70
°C/W
NOTE: Junction−to−ambient thermal resistance is a function of application and board layout. This data is measured with four−layer 2s2p
boards in accordance to JEDEC standard JESD51. Special attention must be paid not to exceed junction temperature T at a
J(max)
given ambient temperature T .
A
Table 6. ELECTRICAL SPECIFICATIONS
(V = 2.7 V to 5.5 V and T = −40C to +85°C unless otherwise noted. Typical values are at T = 25°C and V = 3.6 V.)
IN
A
A
IN
Symbol
POWER SUPPLIES
Parameter
Conditions
Min
Typ
Max
Units
I
Shutdown Supply Current
EN = GND, V = 3.6 V
0.30
2.35
2.15
250
0.75
2.60
2.40
μA
SD
IN
V
Under−Voltage Lockout Threshold
V
IN
IN
Rising
Falling
2.10
1.90
V
UVLO
V
V
Under−Voltage Lockout Hysteresis
mV
UVHYST
EN: ENABLE PIN
V
HIGH−Level Input Voltage
LOW−Level Input Voltage
EN Pull−Down Resistance
EN Low Time for Dimming
Time Delay Between Steps
EN Low, Shutdown Pulse Width
1.2
V
V
IH
V
0.4
400
300
IL
R
200
0.5
0.5
1
300
kW
μs
μs
ms
EN
LO
T
V
IN
V
IN
V
IN
= 3.6 V; See Figure 14
T
HI
= 3.6 V; See Figure 14
T
SD
= 3.6 V; from Falling Edge of EN
FEEDBACK AND REFERENCE
V
Feedback Voltage
I
= 20 mA from −40°C to +85°C,
240
253
0.1
266
1.0
mV
FB
LED
2.7 V ≤ V ≤ 5.5 V
IN
I
FB
Feedback Input Current
V
= 253 mV
μA
FB
POWER OUTPUTS
R
Boost Switch On−Resistance
V
V
= 3.6 V, I
= 2.7 V, I
= 100 mA
= 100 mA
= V
600
650
0.1
mW
DS(ON)_Q1
IN
SW
IN
SW
I
SW Node Leakage (Note 2)
EN = 0, V = V
= 5.5 V,
2.0
μA
SW(OFF)
IN
SW
OUT
V
LED
= 0
I
Boost Switch Peak Current Limit
V
IN
= 3.6 V
750
1.2
mA
LIM−PK
OSCILLATOR
f
Boost Regulator Switching
Frequency
1.0
1.4
MHz
V
SW
OUTPUT AND PROTECTION
V
OVP
Boost Output Over−Voltage
Protection
18.0
18.9
0.8
21.0
OVP Hysteresis
V
V
Short Circuit Detection
V
V
Falling
Rising
V
− 1.4
V
V
TLSC
OUT
OUT
IN
Threshold
V
THSC
V
OUT
Short Circuit Detection
V
IN
− 1.2
OUT
Threshold
D
Maximum Boost Duty Cycle
(Notes 3, 4)
85
%
MAX
D
Minimum Boost Duty Cycle
(Notes 3, 4)
20
MIN
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4
FAN5341
Table 6. ELECTRICAL SPECIFICATIONS (continued)
(V = 2.7 V to 5.5 V and T = −40C to +85°C unless otherwise noted. Typical values are at T = 25°C and V = 3.6 V.)
IN
A
A
IN
Symbol
Parameter
Conditions
Min
Typ
150
35
Max
Units
°C
T
TSD
T
HYS
Thermal Shutdown
Thermal Shutdown Hysteresis
°C
2. SW leakage current includes the leakage current of 2 internal switches, SW to GND and SW to VOUT.
3. Not tested in production and guaranteed by design.
4. Application should guarantee that minimum and maximum duty cycle should fall between 20−85% to meet the specified range.
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5
FAN5341
ELECTRICAL SPECIFICATIONS
90
90
5 LEDs
5 LEDs
L = 10 mH
L = 4.7 mH
C
= 1.0 mF
OUT
C
= 1.0 mF
OUT
I
= 25 mA
LED
I
= 25 mA
LED
80
70
60
50
80
70
60
50
VIN = 2.7 V
VIN = 2.8 V
VIN = 3.6 V
VIN = 4.2 V
VIN = 3.6 V
VIN = 4.2 V
20
25
5
10
15
20
25
5
10
15
LED Current (mA)
LED Current (mA)
Figure 5. 5 LEDs: Efficiency vs. LED Current
vs. Input Voltage
Figure 4. 5 LEDs: Efficiency vs. LED
Current vs. Input Voltage
0.8
90
4 LEDs
L = 10 mH
0.6
0.4
C
LED
= 1.0 mF
OUT
I
= 25 mA
80
70
60
50
0.2
0
−0.2
−0.4
−0.6
VIN = 2.7 V
VIN = 3.6 V
VIN = 4.2 V
−40°C
+25°C
+85°C
2.7
3
3.3
3.6
3.9
4.2
20
25
5
10
15
Input Voltage (V)
LED Current (mA)
Figure 7. Delta of VFB over Input Voltage and
Temperature for 4 LEDs with L = 10 mH and
Figure 6. 4 LEDs: Efficiency vs. LED
Current vs. Input Voltage
C
OUT = 1.0 mF at ILED = 25 mA
90
80
70
60
50
20.0
19.5
19.0
18.5
18.0
17.5
17.0
3 LEDs
4 LEDs
L = 10 mH
L = 10 mH
C
LED
= 1.0 mF
OUT
C
LED
= 1.0 mF
OUT
I
= 25 mA
I
= 25 mA
VIN = 2.8 V
VIN = 3.6 V
VIN = 4.2 V
2.7
3
3.3
3.6
3.9
4.2
20
25
5
10
15
Input Voltage (V)
LED Current (mA)
Figure 9. Over−Voltage Protection vs. Input
Figure 8. 3 LEDs: Efficiency vs. LED Current
vs. Input Voltage
Voltage
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6
FAN5341
ELECTRICAL SPECIFICATIONS (continued)
Figure 11. FAN5341 Dimming Operation at VIN = 3.6 V
Figure 10. Line Transient Response for 4 LEDs
for 4 LEDs with L = 10 mH, COUT = 1.0 mF
at VIN = 3.6 V + 0.6 V with L = 10 mH,
and ILED = 25 mA
C
OUT = 1.0 mF and ILED = 25 mA
Figure 13. Steady−State Waveform for VOUT,
Switch Voltage and Inductor Current for 4 LEDs
at VIN = 3.6 V + 0.6 V with L = 10 mH, COUT = 1.0 mF
and ILED = 25 mA
Figure 12. Startup Waveform for Switch Voltage,
Inductor Current, VFB and EN for 4 LEDs
at VIN = 3.6 V + 0.6 V with L = 10 mH,
C
OUT = 1.0 mF and ILED = 25 mA
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7
FAN5341
CIRCUIT DESCRIPTION
Overview
Digital Dimming Control
The FAN5341 is an inductive current−mode boost serial
LED driver that achieves LED current regulation by
The FAN5341 starts driving the LEDs at the maximum
brightness level. After startup, the control logic is ready to
accept programming pulses to decrease the brightness level
by the number of positive edges applied to the EN pin.
Figure 14 shows the digital pulse dimming control.
maintaining 0.253 V across the R
resistor. The current
SET
through the LED string (I
) is therefore given by:
LED
0.253
RSET
ILED
+
(eq. 1)
Over−Current and Short−Circuit Detection
The boost regulator employs a cycle−by−cycle peak
inductor current limit of ~750 mA.
The voltage V
is determined by the sum of the forward
OUT
voltages across each LED, plus the voltage across R
which is always 253 mV.
,
SET
Over−Voltage / Open−Circuit Protection
Driving Five LEDs in Series
FAN5341 can drive five LEDs in series but, the forward
If the LED string is an open circuit, FB remains at 0 V and
the output voltage continues to increase in the absence of
an over−voltage protection (OVP) circuit. The FAN5341’s
voltage (V ) of the LED MUST be less than 3.5 V such that
F
it remains under the over−voltage specification of 18.9 V.
OVP circuit disables the boost regulator when V
OUT
exceeds 18.9 V and continues to keep the regulator off until
drops below 18.1 V.
UVLO and Soft−Start
If EN has been low for more than 1 ms, the IC may initiate
V
OUT
a “cold start” soft−start cycle when EN rises, provided V
is above the UVLO threshold.
IN
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs
and remains in effect until the die cools to 125°C, at which
time, the circuit is allowed to begin the soft−start sequence.
Digital Interface
The FAN5341 implements a single−wire digital interface
to program the LED brightness to one of thirty−two (32)
levels spaced in linear steps. With this single−wire solution,
the FAN5341 does not require the system processor to
constantly supply a signal to it to drive the LEDs.
t
SD
t
HI
t
LO
EN
4
28
29
3
30
31
0
1
2
0
1
Level 32: 100%
Level 32: 100%
Level 31
Level 31
Level 30
Level 29
Level 28
Level 5
Level 4
Shutdown
Level 3
Level 2
Level 1
Figure 14. Digital Pulse−Dimming Control Diagram
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8
FAN5341
APPLICATION INFORMATION
Inductor & Output Capacitor Selection
Table 7. RECOMMENDED EXTERNAL COMPONENTS
# of LEDs Inductor (L)
Part Number
LQH43MN100K03
Manufacturer
Murata
TDK
Min C
Part Number
Manufacturer
OUT
3, 4, 5
10.0 mH
1.00 mF
CV105X5R105K25AT
AVX/Kyocera
NLCV32T−100K−PFR
VLF3010AT−100MR49−1
LQH43MN4R7K03
TDK
4.7 mH
Murata
TDK
1.00 mF
CV105X5R105K25AT
AVX/Kyocera
NLCV32T−4R7M−PFR
LPF2010T−4R7M
ABCO
Component Placement and PCB Recommendations
Figure 15. Recommended Component Placement
PCB Recommendations
Input Capacitance
In a typical application, the input and output capacitors
should be placed as close to the IC as possible; no additional
capacitance is needed to ensure proper functionality.
However, in a testing environment, where the FAN5341 is
typically powered by a power supply with relatively long
cables, an additional input capacitor (10 mF) may be needed
to ensure stable functioning. This capacitor should be placed
close to where the power supply cables attach to
the FAN5341 evaluation board.
• The inductor can be connected to VIN with vias
through another layer if needed.
• The feedback pin should be connected back to the IC
on a sub−layer.
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9
MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
UDFN6 2x2, 0.65P
CASE 517DS
ISSUE O
DATE 31 OCT 2016
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DESCRIPTION:
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UDFN6 2x2, 0.65P
PAGE 1 OF 1
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