AW3640
February 2018 V1.2
www.awinic.com.cn 1 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
200mA 1-Wire Configurable Front Flash LED Driver
with Ultra Small Package
FEATURES
Front Flash LED Driving
200mA Maximum Flash Current
16 Steps Current 1-wire Pulse Configurable,
12.5mA/step
LED Current Accuracy: ±15%
Low Dropout Voltage: 65mV@200mA (Typ.)
Efficiency: 94% (VIN=3.6V, VF=3.4V)
Shutdown Current: <0.1μA
Ultra Small 1.5×1.0×0.55mm3 DFN-6L Package
APPLICATION
Front Camera Flash
LED Torch Mode
GENERAL DESCRIPTION
AW3640 is a low voltage-drop current sink LED
driver, which supports both Torch and Flash
modes. The current-regulation sink integrated in
the chip make the LED current capable of keeping
constant when input voltage, LED forward voltage
or temperature changing. The LED current can be
adjusted among 16 steps by sending 1-wire pulse
into the EN pin, and the maximum value is 200mA.
AW3640 is available in an ultra small 1.5mm×
1.0mm×0.55mm DFN-6L package. And only one
multi-layer ceramic capacitor is needed for the
peripheral of the solution.
In shut down mode, AW3640 turns off all internal
circuit and the consumption is less than 0.1μA.
The device requires 2.8V~5.5V input voltage range
and an operating temperature range of -40~85℃.
TYPICAL APPLICATION CIRCUIT
AW3640
ILED
VIN
GND
Battery
EN
1uF
+
_4
2
1,3
6
12n≤16
GPIO
Figure 1 AW3640 Application Circuit for Single LED
All the trademarks mentioned in the document are the property of their owners.
AW3640
February 2018 V1.2
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PIN CONFIGURATION AND TOP MARK
PIN DEFINITION
No.
NAME
DESCRIPTION
1
GND
Ground.
2
ILED
Open drain current sink pin, connected to LED cathode.
3
GND
Ground.
4
VIN
Power Supply (2.8V-5.5V)
5
NC
Not connected.
6
EN
Enable pin. LED current can be adjusted by sending 1-wire pulse into
this pin.
AW3640
February 2018 V1.2
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ORDERING INFORMATION
Part
Number
Temperature
Package
Moisture
Sensitivity
Level
Environmental
Information
Marking
Delivery Form
AW3640
DNR
-40℃～85℃
1.5mm×1.0mm
DFN-6L
MSL3
ROHS+HF
DXX
Tape and Reel
3000pcs/Reel
AW3640
Shipping
R: Tape & Reel
Package Type
DN: DFN
TYPICAL APPLICATION CIRCUITS
AW3640
ILED
VIN
GND
Battery
EN
1uF
+
_4
2
1,3
6
12n≤16
GPIO
Figure 2 AW3640 Application Circuit for Single LED
AW3640
ILED
VIN
GND
Battery
EN
1uF
+
_4
2
1,3
6
12n≤16
GPIO1
AW3640
ILED
VIN
GND
EN
4
2
1,3
6
2n≤16
1
GPIO2
Figure 3 AW3640 Application Circuit for Dual LEDs
AW3640
February 2018 V1.2
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ABSOLUTE MAXIMUM RATINGS(NOTE1)
PARAMETERS
Range
Unit
VIN, ILED
-0.3 to 6
V
EN
−0.3 to (VIN+0.3)
V
Max Junction Temperature TJMAX
125
℃
Storage Temperature TSTG
-65 to 150
℃
Maximum lead temperature (soldering)
260
℃
Junction to Ambient Thermal Resistance θJA
148.2
℃/W
ESD, All Pins(NOTE2)
HBM
8000
V
MM
300
V
CDM
1000
V
Latch-Up
JEDEC STANDARD NO.78B DECEMBER 2008
+IT：+450
-IT：-450
mA
RECOMMENDED OPERATING CONDITIONS
PARAMETERS
Range
Unit
VIN
2.8 to 5.5
V
Junction temperature (TJ)
-40 to 125
℃
Ambient temperature (TA)
-40 to 85
℃
NOTE1: Conditions out of those ranges listed in "absolute maximum ratings" may cause permanent damages
to the device. In spite of the limits above, functional operation conditions of the device should within the ranges
listed in "recommended operating conditions". Exposure to absolute-maximum-rated conditions for prolonged
periods may affect device reliability.
NOTE2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Test
method: MIL-STD-883G Method 3015.7
AW3640
February 2018 V1.2
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ELECTRICAL CHARACTERISTICS
VBAT=3.8V, TA=25℃ for typical values (unless otherwise noted)
Symbol
Description
Test Conditions
Min
Typ.
Max
Units
Power supply
VIN
Input operation voltage
2.8
5.5
V
ISHUTDOWN
Current in Shutdown mode
EN=0
0.1
1
A
IQ
Quiescent Current in Active
mode
EN=1, ILED floating
255
A
Digital Logical Interface
VIL
Logic input low level
0.4
V
VIH
Logic input high level
1.3
V
REN
Pull down resistor inside
100
kΩ
1-Wire Dimming Pulse Timing
TLO
EN pulse low time
0.5
500
μs
THI
EN pulse high time
0.5
μs
TSHDN
Chip shutdown delay
Measure from EN falling edge
to the chip entering shutdown
mode
0.8
2.5
ms
LED Driver
ILED
Current accuracy
ILED=200mA
170
200
230
mA
VDROP
Dropout voltage
ILED=200mA
65
100
mV
AW3640
February 2018 V1.2
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FUNCTIONAL BLOCK DIAGRAM
DEGLITCH CURRENT
ADC
CURRENT
REFERENCE
CURRENT
SINK
6
4
1,3
2
GND
EN
VIN ILED
5
NC
Figure 4 AW3640 Functional Block
AW3640
February 2018 V1.2
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TYPICAL CHARACTERISTICS
Figure 5 Quiescent Current vs. Input Voltage Figure 6 LED Current vs. ILED pin Voltage
Figure 7 LED Current vs. Temperature Figure 8 LED Current vs. 1-Wire Dimming Step
AW3640
February 2018 V1.2
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DETAILED DESCRIPTION
AW3640 is a low voltage-drop current sink LED driver, which supports both Torch and Flash modes. The
current-regulation sink integrated in the chip make the LED current capable of keeping constant when input
voltage, LED forward voltage or temperature changing. The LED current can be adjusted among 16 steps by
sending 1-wire pulse into the EN pin, and the maximum value is 200mA.
ENABLE CONTROL
The voltage level at EN pin determines the operation state of the chip. When the EN pin is set to high, AW3640
operates in normal state. And the chip would enter shutdown mode if the EN pin is set to low for over 2.5ms, as
a built-in shutdown delay circuit in AW3640. The shutdown current dissipated by AW3640 is less than 0.1μA.
GLITCH ELIMINATION
AW3640 built in deglitch circuit. The interference between signals inside the portable device is unavoidable,
thus deglitch circuit is necessary at the EN pin. The deglitch circuit inside AW3640 is capable of eliminating the
glitch which is narrower than 80ns, preventing the incorrect trigger at the EN pin effectively.
APPLICATION INFORMATION
1-WIRE PULSE DIMMING
AW3640 adopts the 1-wire pulse dimming to avoid the switch noise. A 4-bit DAC inside AW3640 allows
counting the rising edge at the EN pin to set the LED current (refer to Figure 5 and Table 1). Figure 5 shows that
the first high level hold time TON should be over 20μs to make sure the chip start up regularly, and meantime
setting the LED current to the maximum value. Other EN pulse timing requirements include normal high level
time THI should longer than 0.5μs, and low level time TLO should between 0.5μs and 500μs.
EN
ILED
16/16 15/16 14/16 13/16 12/16 3/16 2/16 1/16
16/16
20us<TON 0.5us<THI 0.5us<TLO<500us 2.5ms<TSHDN
1 2 34515
616 1
Figure 9 AW3640 1-wire dimming timing diagram
The LED current steps down along with the increasing EN pulse rising edge number as shown in table 1. After
the current set process, the EN pin should set to high level.
AW3640
February 2018 V1.2
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Table 1 LED Current vs. EN Rising Edge Number
EN Rising Edge Number
LED Current (mA)
EN Rising Edge Number
LED Current (mA)
1
200
9
100
2
187.5
10
87.5
3
175
11
75
4
162.5
12
62.5
5
150
13
50
6
137.5
14
37.5
7
125
15
25
8
112.5
16
12.5
EFFICIENCY
AW3640 is a low voltage-drop current sink LED driver, its operation efficiency can be approximately calculated
as below.
IN
F
OUTIN
OUTF
ININ
OUTF
IN
OUT V
V
IV IV
IV IV
P
P
≈
VF in the formula represents the forward voltage of LED. If VIN is 3.6V, VF is 3.4V, the chip efficiency is about
94%.
PCB LAYOUT CONSIDERATION
To make fully use of the performance of AW3640, the guidelines below should be followed.
1、 All the peripherals should be placed as close to the device as possible. Place the input capacitor CIN on the
top layer (same layer as the AW3640) and close to VIN (pin4).
2、 Route the power line (shown in Figure 2) as widely and shortly as possible to reduce parasitic impedance.
3、 To optimize the heat dissipation performance, the GND pins (pin1 & 3) should be connected to the PCB
ground plane using as many vias as possible.
AW3640
February 2018 V1.2
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TAPE AND REEL INFORMATION
CARRIER TAPE
PIN1
Pin 1
User Direction of Feed
AW3640
February 2018 V1.2
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REEL
NOTE:
1、 ALL DIMS IN mm;
2、 General Tolerance ±0.25mm.
AW3640
February 2018 V1.2
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PACKAGE INFORMATION
SYMBOL
Dimensions in
Millimeters
Dimensions in
Inches
Min.
Max.
Min.
Max.
A
0.500
0.600
0.020
0.024
A1
0.000
0.050
0.000
0.002
A3
0.152REF.
0.006REF.
b
0.150
0.250
0.006
0.010
b1
0.150REF.
0.006REF.
D
0.900
1.100
0.035
0.043
E
1.400
1.600
0.055
0.063
e
0.500BSC.
0.020BSC.
k
0.300REF.
0.012REF.
k1
0.250REF.
0.010REF.
L
0.300
0.400
0.012
0.016
L1
0.350
0.450
0.014
0.018
AW3640
February 2018 V1.2
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LAND PATTERN EXAMPLE
0.50.3
0.5
0.26 1.26
NOTE: Dimensions are in millimeters.
AW3640
February 2018 V1.2
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REFLOW
Figure 10 Package Reflow Oven Thermal Profile
Reflow Note
Spec
Average ramp-up rate (217℃c to Peak)
Max. 3℃/sec
Time of Preheat temp.(from 150℃ to 200℃)
60-120sec
Time to be maintained above 217℃
60-150sec
Peak Temperature
250℃-260℃
Time within 5℃ of actual peak temp
20-40sec.
Ramp-down rate
Max. 6℃/sec
Time from 25℃ to peak temp
Max. 8min.
AW3640
February 2018 V1.2
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REVISION HISTORY
Vision
Date
Change Record
V0.9
July 2016
Datasheet V0.9 Released
V1.0
October 2016
Datasheet V1.0 Released
V1.1
January 2017
1. Added Tape and Reel information;
2. Added RoHS and MSL statements.
3. Added Land pattern example.
V1.2
February 2018
1. Updated Ordering Information table;
2. Deleted Page1 Chinese content.
AW3640
February 2018 V1.2
www.awinic.com.cn 16 Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
DISCLAIMER
Information in this document is believed to be accurate and reliable. However, Shanghai AWINIC Technology
Co., Ltd (AWINIC Technology) does not give any representations or warranties, expressed or implied, as to the
accuracy or completeness of such information and shall have no liability for the consequences of use of such
information.
AWINIC Technology reserves the right to make changes to information published in this document, including
without limitation specifications and product descriptions, at any time and without notice. Customers shall obtain
the latest relevant information before placing orders and shall verify that such information is current and
complete. This document supersedes and replaces all information supplied prior to the publication hereof.
AWINIC Technology products are not designed, authorized or warranted to be suitable for use in medical,
military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an AWINIC
Technology product can reasonably be expected to result in personal injury, death or severe property or
environmental damage. AWINIC Technology accepts no liability for inclusion and/or use of AWINIC Technology
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risk.
Applications that are described herein for any of these products are for illustrative purposes only. AWINIC
Technology makes no representation or warranty that such applications will be suitable for the specified use
without further testing or modification.
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