LED Flash. AS3685A Datasheet

AS3685A Flash. Datasheet pdf. Equivalent

AS3685A Datasheet
Recommendation AS3685A Datasheet
Part AS3685A
Description Ultra Small High Efficiency 1000mA Charge Pump for White LED Flash
Feature AS3685A; AS3685A/AS3685B Product Brief austria micro systems Product Brief AS3685A/AS3685B Ultra Small Hig.
Manufacture austriamicrosystems
Datasheet
Download AS3685A Datasheet




austriamicrosystems AS3685A
AS3685A/AS3685B
DDataasthaesetheet
austriamicrosystems
AS3685A/AS3685B
Ultra Small High Efficiency 1000mA Charge Pump for White
LED Flash
1 General Description
The AS3685 is low noise high efficiency capacitive
charge pump with 1:1, 1:1.5 and 1:2 operating
modes in a small 3x3mm DFN10 or a tiny 2x1.5mm
WL-CSP (Wafer Level Chip Scale Package)
package. It can drive one flash led at up to 1000mA
current. It supports flash/torch and indicator mode
for the flash led.
Additionally the AS3685 limits the flash time
automatically to protect the flash LED.
2 Key Features
ƒ High Efficiency capactive charge pump with 1:1,
1:1.5 and 1:2 modes
1:2 Mode can be disabled
(different device versions available)
ƒ Up to 1000mA Led Current
ƒ Automatic Charge Pump Mode switching (Up)
ƒ LED cathode disconnect in Shutdown
ƒ Overtemperature Protection
ƒ Automatic 800ms Flash Timeout to protect the
flash LED
ƒ Two Device Variants:
AS3685A: Direct control to select three
currents
AS3685B: Single Pin Interface or Two Pin
Interface with Strobe Input; 17 different
currents can be selected
ƒ Package
DFN10 3x3mm (10 pins + exposed pad)
WL-CSP (Wafer Level Chip Scale Package)
3x4 balls 0.5mm pitch (2x1.5mm)
3 Applications
ƒ Flash / Torch for Mobile Phones, Digital
Cameras and PDA
4 Application Diagram
Figure 1 – Application Diagram of AS3685A/AS3685B
CFLY1 1.0 F
CFLY2 1.0 F
VBAT
CBAT
2.2 F
C1+ C1- C2+ C2-
VBAT
VCP
AS3685A
EN1 AS3685B
ILED
EN2
ISET VSS
RTXMASK
RISET
CVCP
2.2 F
DLED
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austriamicrosystems AS3685A
AS3685A/AS3685B
Datasheet
Table of Contents
1 General Description........................................................................................................................................... 1
2 Key Features ..................................................................................................................................................... 1
3 Applications ....................................................................................................................................................... 1
4 Application Diagram .......................................................................................................................................... 1
5 Characteristics................................................................................................................................................... 3
5.1 Absolute Maximum Ratings..................................................................................................................... 3
5.2 Operating Conditions .............................................................................................................................. 3
5.3 Electrical Characteristics ......................................................................................................................... 4
6 Typical Operation Characteristics...................................................................................................................... 6
7 Detailed Functional Description ......................................................................................................................... 8
7.1 Low Noise Charge Pump ........................................................................................................................ 8
7.1.1 Mode Switching........................................................................................................................ 8
7.1.2 Soft Start .................................................................................................................................. 9
7.2 Current Source (Sink).............................................................................................................................. 9
7.2.1 AS3685A Current Setting ......................................................................................................... 9
7.2.2 AS3685B Current Setting ....................................................................................................... 12
7.2.3 AS3685A and AS3685B TXMask Function ............................................................................ 15
7.3 Protection Functions.............................................................................................................................. 16
7.3.1 Overtemperature Protection ................................................................................................... 16
7.3.2 Flash Timeout ........................................................................................................................ 16
7.4 Layout Recommendations..................................................................................................................... 16
8 External Components ...................................................................................................................................... 17
8.1 Capacitor and Resistor Selection .......................................................................................................... 17
8.2 Usage of PCB Wire Inductance............................................................................................................. 17
8.3 External Component Specifications ...................................................................................................... 17
9 Pinout and Packaging...................................................................................................................................... 18
9.1 DFN10 3x3mm ...................................................................................................................................... 18
9.1.1 Pin Assignments DFN10 3x3mm ........................................................................................... 18
9.1.2 Pin Descriptions DFN10 3x3mm ............................................................................................ 18
9.1.3 Package Drawings and Marking DFN10 3x3.......................................................................... 19
9.2 WL-CSP 2x1.5mm (Wafer Level Chip Scale Package) ......................................................................... 21
9.2.1 Pin Assignments WL-CSP 2x1.5mm...................................................................................... 21
9.2.2 Pin Descriptions WL-CSP 2x1.5mm....................................................................................... 21
9.2.3 Package Drawings and Marking WL-CSP 2x1.5mm .............................................................. 22
10 Ordering Information........................................................................................................................................ 23
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austriamicrosystems AS3685A
AS3685A/AS3685B
Datasheet
5 Characteristics
5.1 Absolute Maximum Ratings
Stresses beyond those listed in Table 1 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 Section 5
Electrical Characteristics is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 1 – Absolute Maximum Ratings
Symbol Parameter
Min Max Unit
Note
VBATMAX
Maximum Supply Voltage
-0.3 7.0 V
IIN
Input Pin Current without causing
latchup
-25
+25 mA
At 25ºC, Norm: Jedec 17
TSTRG
Storage Temperature Range
-55 125 °C
Humidity
5 85 %
Non condensing
VESD
PT
Electrostatic Discharge
-1000
Total Continuous Power Dissipation
PDERATE
PT Derating Factor 2
1000
1.14
1.02
16.3
14.7
V
W
W
mW/
°C
mW/
°C
Norm: MIL 883 E Method 3015
DFN10 3x3mm, TA = 70°C 1
WL-CSP 2x1.5mm, TA = 70°C 1
DFN10 3x3mm
WL-CSP 2x1.5mm
TJUNC
TBODY
Notes:
1.
2.
Junction Temperature
Body Temperature during Soldering
150 °C
260
°C
according to IPC/JEDEC J-
STD-020C
Depending on actual PCB layout and PCB used; for peak power dissipation during flashing see
document ‘AS3685 Thermal Measurements’
For 1A flash current see application notes ‘AN3685_1Aflash’ and ‘AN3685_1Aflash_thermal_1v0’.
The PT derating factor changes the total continuous power dissipation, if the ambient temperature
is different to 70°C. Therefore for e.g. 85°C calculate PT85°C = PT – PDERATE * (85°C – 70 °C)
5.2 Operating Conditions
Table 2 – Operating Conditions
Symbol Parameter
VBAT
Battery Supply Voltage
VBATFUNC
Battery Supply Voltage,
Functionally working
IBAT Operating Current
TAMB
IOFF
Ambient Temperature
Off mode current
Min Typ Max Unit
Note
3.0 3.6 5.5 V
Supply voltage range
2.6
V
AS3685 functionally working,
but not all parameters fulfilled
0.4
A
Depending on load current
and charge pump mode
2.0 A Limited lifetime, max 20,000s
-30 25 85 °C
1.0 4.0 μA
EN1 = 0, EN2 = 0;
VBAT<=4.2V
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