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PDF SC627A Data sheet ( Hoja de datos )
| Número de pieza | SC627A | |
| 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 SC627A (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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POWER MANAGEMENT
SC627A
LED Light Management Unit
Charge Pump, 4 LEDs, 700mA Flash LED,
Dual LDOs, and I2C Interface
Features
Description
Input supply voltage range — 3.0V to 5.5V
Charge pump modes — 1x, 1.5x and 2x
Four programmable current sinks with 32 steps from
0.5mA to 25mA
Flash LED — 700mA 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
Backlight current accuracy ±1.5% typical
Backlight current matching ±0.5% typical
Programmable fade-in/fade-out for main backlight
External flash control pin to sync with camera
Optional 1s flash time out
Automatic sleep mode (LEDs 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 backlighting and flash
PDA backlighting and flash
Camera I/O and core power
www.DataSheet4U.com
The SC627A 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 backlight current in
conjunction with four matched current sinks. It also can
supply continuous or bursted current to a flash LED using
the dedicated flash driver current sink. The load and
supply conditions determine whether the charge pump
operates in 1x, 1.5x, or 2x mode. An optional fading feature
that gradually adjusts the backlight current is provided to
simplify control software. A flash-timeout feature disables
the flash if active for longer than 1 second.The SC627A also
provides two low-dropout, low-noise linear regulators for
powering a camera module or other peripheral circuits.
The SC627A uses an I2C compatible serial interface. The
interface controls all functions of the device, including
backlight and flash currents as well as 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
VIN VOUT
SDA SC627A
SCL
FLEN
EN
BYP
BL 1
BL 2
BL 3
BL 4
FL
AGND
PGND
LDO 1
LDO 2
COUT
4.7μF
MAIN BACKLIGHT
FLASH
VLDO1 = 2.5V to 3.3V
VLDO2 = 1.5V to 1.8V
May 21, 2007
C1+ C1- C2+ C2-
C1
2.2μF
C2
2.2μF
CLDO1
1μF
CLDO2
1μF
© 2007 Semtech Corporation
US Patents: 6,504,422; 6,794,926
1
1 page  
SC627A
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min Typ
LDO Electrical Specifications (continued)
Load Regulation
ΔV
LOAD
Dropout Voltage(5)
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
VBL1 (500mV/div)
VOUT (2V/div)
IBL1 (20mA/div)
www.DataSheet4U.com
Time (200μs/div)
SC627A
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 24 Páginas | |
| PDF Descargar | [ Datasheet SC627A.PDF ] | |
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