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PDF SC622A Data sheet ( Hoja de datos )
| Número de pieza | SC622A | |
| Descripción | LED Light Management Unit Charge Pump | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC622A (archivo pdf) en la parte inferior de esta página. Total 23 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 — 400mA max in flash mode, 250mA max
continuous for spotlight
Two user-configurable 100mA low-noise LDO
regulators
Charge pump frequency — 250kHz
I2C compatible interface — up to 400kHz
External flash control pin to sync with camera
Optional 1s flash time out
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
Camera I/O and core power
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SC622A
LED Light Management Unit
Charge Pump, 400mA Flash LED, Dual
LDOs, and I2C Interface
Description
The SC622A is a high efficiency charge pump LED driver
using Semtech’s proprietary mAhXLifeTM technology.
Performance is optimized for use in single-cell Li-ion
battery applications.
The charge pump provides continuous or bursted current
to a flash LED using a dedicated flash driver current sink.
The load and supply conditions determine whether the
charge pump operates in 1x, 1.5x, or 2x mode. A flash-
timeout feature disables the flash if active for longer than
1 second. The SC622A also provides two low-dropout,
low-noise linear regulators for powering a camera module
or other peripheral circuits.
The SC622A uses an I2C compatible serial interface. The
interface controls all functions of the device, including
flash current and two LDO voltage outputs. The flash/
spotlight output is triggered via either the I2C interface or
a dedicated pin.
In sleep mode, the device reduces quiescent current to
100μA while continuing to monitor the serial interface.
The two LDOs can be enabled when the device is in sleep
mode. Total current reduces to 0.1μA in shutdown.
Typical Application Circuit
VBAT
CIN
2.2μF
I2C Data
I2C Clock
Flash Control
Enable Control
CBYP
22nF
July 19, 2007
VIN VOUT
SDA SC622A
SCL
FLEN
EN
COUT
4.7μF
FLASH
BYP
AGND
PGND
FL
LDO 1
LDO 2
VLDO1 = 2.5V to 3.3V
VLDO2 = 1.5V to 1.8V
C1+ C1- C2+ C2-
C1
2.2μF
C2
2.2μF
CLDO1
1μF
© 2007 Semtech Corporation
CLDO2
1μF
US Patents: 6,504,422; 6,794,926
1
1 page  
SC622A
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min Typ
LDO Electrical Specifications (continued)
Load Regulation
ΔV
LOAD
Dropout Voltage(3)
Current Limit
Power Supply
Rejection Ratio
V
D
I
LIM
PSRR
LDO1
PSRR
LDO2
Output Voltage Noise
e
n-LDO1
e
n-LDO2
Minimum Output Capacitor
C
LDO(MIN)
Digital I/O Electrical Specifications (FLEN, EN)
V = 3.3V, V = 3.7V,
LDO1
IN
I = 1mA to 100 mA
LDO1
V = 1.8V, V = 3.7V,
LDO2
IN
I = 1mA to 100 mA
LDO2
I = 100mA
LDO1
2.5V < VLDO1 < 3V, f < 1kHz, CBYP = 22nF, ILDO1 = 50mA,
V = 3.7V with 0.5V ripple
IN P-P
f < 1kHz, CBYP = 22nF, ILDO2 = 50mA,
V = 3.7V with 0.5V ripple
IN P-P
LDO1, 10Hz < f < 100kHz, CBYP = 22nF, CLDO = 1μF,
I = 50 mA, V = 3.7V, 2.5V < V < 3V
LDO1
IN
LDO1
LDO2, 10Hz < f < 100kHz, CBYP = 22nF,
C = 1μF, I = 50 mA, V = 3.7V
LDO LDO2
IN
200
100
50
60
100
50
1
Input High Threshold
V
IH
V = 5.5V
IN
1.6
Input Low Threshold
V
IL
V = 3.0V
IN
wwwIn.pDuataHSihgeheCt4uUrr.econmt
I
IH
V = 5.5V
IN
-1
Input Low Current
I
IL
V = 5.5V
IN
-1
I2C Interface
Interface complies with slave mode I2C interface as described by Philips I2C specification version 2.1 dated January, 2000.
Digital Input Voltage
SDA Output Low Level
Digital Input Current
Hysteresis of
Schmitt Trigger Inputs
Maximum Glitch Pulse
Rejection
V
B-IL
VB-IH
I
B-IN
V
HYS
t
SP
IDIN (SDA) ≤ 3mA
1.6
-0.2
0.1
50
Max Units
25
mV
20
150 mV
mA
dB
μV
RMS
μF
V
0.4 V
+1 μA
+1 μA
0.4 V
V
0.4 V
0.2 μA
V
ns
5
5 Page 
Typical Characteristics (continued)
Output Short Circuit Current Limit
V =0V, V =4.2V, 25°C
OUT IN
VOUT (1V/div)
IOUT (100mA/div)
Time (1ms/div)
Output Open Circuit Protection
V =3.7V, 25°C
IN
VFL (500mV/div)
VOUT (2V/div)
6V
IFL (100mA/div)
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0V
Time (200μs/div)
SC622A
Flash Mode Safety Timer
V =3.7V, 25°C
IN
VFLEN (5V/div)
VOUT (2V/div)
IFL (200mA/div)
Time (200ms/div)
Flash Current Pulse
VFLEN (5V/div)
I =400mA, V =3.7V, V =3.7V, 25°C
FL IN OUT
VOUT (2V/div)
IFL (200mA/div)
Time (40ms/div)
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet SC622A.PDF ] | |
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