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PDF SC628A Data sheet ( Hoja de datos )
| Número de pieza | SC628A | |
| Descripción | LED Flash Driver Charge Pump | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC628A (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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POWER MANAGEMENT
Features
Input supply voltage range — 3.0V to 5.5V
Charge pump modes — 1x, 1.5x and 2x
Flash LED — 1000mA max in flash mode, 275mA max
continuous for spotlight
Charge pump frequency — 250kHz
I2C compatible interface — up to 400kHz
External flash control pin to sync with camera
One second flash time out with disable feature
Automatic sleep mode (flash off ) — I = 100μA
Q
Low shutdown current — 0.1μA (typical)
Ultra-thin package — 3mm x 3mm x 0.6mm
Fully WEEE and RoHS compliant
Applications
Cellular phone flash
PDA flash
SC628A
LED Flash Driver
Charge Pump with 1000mA Flash Mode,
275mA Spotlight Mode, and I2C Interface
Description
The SC628A is a high efficiency charge pump LED driver
using Semtech’s proprietary charge pump technology.
Performance is optimized for use in single-cell Li-ion
battery applications. The load and supply conditions
determine whether the charge pump operates in 1x, 1.5x,
or 2x mode.
The charge pump provides continuous spotlight mode
current or pulsed flash mode current to an LED using a
dedicated current sink. In flash mode, a flash-timeout
feature turns off the flash if active for longer than 1 second.
In spotlight mode, the timeout feature is disabled to allow
continuous operation of the LED.
The SC628A uses an I2C compatible serial interface to set
the flash mode or the spotlight mode current. The flash/
spotlight output is triggered via either the I2C interface or
a dedicated flash enable pin (FLEN).
In sleep mode, the device reduces quiescent current to
100μA while continuing to monitor the serial interface.
Total current reduces to 0.1μA in shutdown.
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Typical Application Circuit
VBAT = 3.0V to 5.5V
CIN
4.7μF
I2C Data
I2C Clock
Flash Control
Enable Control
July 14, 2009
IN OUT
SDA SC628A
SCL
FLEN
EN
AGND
PGND
FL
C1+ C1- C2+ C2-
COUT
4.7μF
FLASH
C1
2.2μF
C2
2.2μF
US Patents: 6,504,422; 6,794,926
1
1 page  
SC628A
Electrical Characteristics (continued)
Parameter
I2C Timing
Clock Frequency
SCL Low Period(3)
SCL High Period(3)
Data Hold Time(3)
Data Setup Time(3)
Setup Time for Repeated
START Condition(3)
Hold Time for Repeated
START Condition(3)
Setup Time for STOP
Condition(3)
Bus-Free Time Between
STOP and START(3)
Symbol
f
SCL
t
LOW
t
HIGH
t
HD_DAT
t
SU_DAT
tSU_STA
tHD_STA
tSU_STO
t
BUF
Conditions
Min Typ Max Units
400 440 kHz
1.3 μs
0.6 μs
0 μs
250 ns
0.6 μs
0.6 μs
0.6 μs
1.3 μs
Interface Start-up Time(3)
t Bus Start-up Time After EN Pin is Pulled High
EN
1 ms
Notes:
(1) Once tripped, flash output will remain disabled until FLEN pin is cycled or reset via serial interface.
(2) Test voltage is V = 4.5V — a relatively extreme LED voltage — to force a transition during test. Typically V = 3.3V for the white LED at
OUT OUT
100mA.
(3) Guaranteed by design
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5
5 Page 
Block Diagram
IN 19
C1+ C1-
18 20
C2+ C2-
17 1
mAhXLifeTM Fractional
Charge Pump
(1x, 1.5x, 2x)
EN 12
SDA 11
FLEN 10
SCL 9
I2C
Compatible
Interface
and Logic
Control
Oscillator
Current
Setting
DAC
Flash Output
Current Sink
NC 13
AGND 8
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Bandgap
Reference
SC628A
16 OUT
2 PGND
4 NC
5 NC
6 NC
7 NC
3 FL
15 NC
14 NC
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet SC628A.PDF ] | |
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