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PDF AS3685A Data sheet ( Hoja de datos )
| Número de pieza | AS3685A | |
| Descripción | Ultra Small High Efficiency 1000mA Charge Pump for White LED Flash | |
| Fabricantes | austriamicrosystems | |
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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
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)
Up to 1000mA Led Current
Automatic Charge Pump Mode switching (Up)
LED cathode disconnect in Shutdown
Overtemperature Protection
Automatic 800ms Flash Timeout to protect the
flash LED
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
Package
− DFN10 3x3mm (10 pins + exposed pad)
− WL-CSP (Wafer Level Chip Scale Package)
3x4 balls 0.5mm pitch (2x1.5mm)
3 Applications
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
www.austriamicrosystems.com/AS3685
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Revision 2.2
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AS3685A/AS3685B
Datasheet
Table 4 – Current Source (Sink) Characteristics
Symbol Parameter
ITORCH2ISET
Torch Current to Bias Current
Ratio
Min
VSWITCH
Mode Switching Threshold on
V(ILED) between 1:1 -> 1:1.5
and 1:1.5 -> 1:2
150
Typ
1639
400
200
Max
250
Unit
A/A
mV
mV
Note
AS3685A, EN1=0, EN2=1
(150mA with RISET = 14.2kΩ)
AS3685A, EN1=1, EN2=1 or
AS3685B with ILED>350mA
(with RISET = 14.2kΩ)
All lower currents
Table 5 –Digital Interface characteristics
Symbol Parameter
VIH High Level Input voltage
VIL Low Level Input voltage
ILEAKAGE
Input pin leakage current
tPULSEWIDTH
Pulsewidth for signals on EN1
and EN2 (high or low pulses)
Min
1.5
0.0
-10
1.0
Typ Max Unit
Note
VBAT
0.5
V
V
For Pins EN1 and EN2
10 μA
unlimited μs
Do not leave EN1 and EN2
floating; (47kΩ pulldowns can
be used)
Table 6 – Protection Functions
Symbol Parameter
TOVTEMP Overtemperature protection
Min
TOVTEMPHYST
Overtemperature protection
Hysteresis
tFLASHTIMEOUT
Flash Timeout Time
-20%
Typ Max Unit
Note
If the junction temperature
140
°C
exceeds TOVTEMP, the current
sink will be disabled and the
charge pump switched back
into 1:1 mode until the
5 °C temperature drops below
TOVTEMP - TOVTEMPHYST
800
+20% ms
AS3685A, EN1=1, EN2=1 or
AS3685B flash modes
www.austriamicrosystems.com/AS3685
(ptr)
Revision 2.2
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5 Page 
AS3685A/AS3685B
Datasheet
Figure 15 – AS3685A Pulsed Indicator Mode
EN1
Set duration of Torch-Pulse (tTORCH)
with number of pulses on pin EN2
EN2
ILED
Torch
Current
max. 128µs
min tPULSEWIDTH
(1µs)
typ. 64µs
off
Table 8 – AS3685A tTORCH timings
H-L Pulses on EN2
1,2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
≥17
tTORCH
0ms
ignored (noise filter)
1ms
2ms
3ms
4ms
5ms
6ms
7ms
8ms
9ms
10ms
11ms
12ms
13ms
14ms
15ms
tTORCH
off t
www.austriamicrosystems.com/AS3685
(ptr)
Revision 2.2
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AS3685A.PDF ] | |
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