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PDF SC624 Data sheet ( Hoja de datos )
| Número de pieza | SC624 | |
| 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 SC624 (archivo pdf) en la parte inferior de esta página. Total 22 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
Four programmable current sinks with 32 steps from
0.5mA to 25mA
Two user-configurable 100mA low-noise LDO
regulators
Charge pump frequency — 250kHz
SemWireTM single wire interface — up to 75kbit/s
Backlight current accuracy ±1.5% typical
Backlight current matching ±0.5% typical
Programmable fade-in/fade-out for main backlight
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
PDA backlighting
Camera I/O and core power
SC624
LED Light Management Unit
Charge Pump, 4 LEDs, Dual LDOs,
and SemWireTM Interface
Description
The SC624 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. 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. The SC624 also
provides two low-dropout, low-noise linear regulators for
powering a camera module or other peripheral circuits.
The SC624 uses the proprietary SemWireTM single wire
interface. The interface controls all functions of the device,
including backlight current and two LDO voltage outputs.
The single wire implementation minimizes microcontroller
and interface pin counts.
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.
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Typical Application Circuit
VBAT
CIN
1μF
SemWire
Interface
CBYP
22nF
June 27, 2007
VIN VOUT
SWIF
SC624
COUT
2.2μF
MAIN BACKLIGHT
BYP
GREF
AGND
PGND
BL1
BL2
BL3
BL4
LDO1
LDO2
VLDO1 = 2.5V to 3.3V
VLDO2 = 1.5V to 1.8V
C1+ C1- C2+ C2-
C1 C2
1μF 1μF
CLDO1
1μF
CLDO2
1μF
US Patents: 6,504,422; 6,794,926
© 2007 Semtech Corporation
1
1 page  
SC624
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min Typ Max Units
LDO Electrical Specifications (continued)
Load Regulation
ΔV
LOAD
Dropout Voltage(4)
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 (SWIF)
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, CLDO = 1μF,
I = 50 mA, V = 3.7V
LDO2
IN
200
100
50
60
100
50
1
25
mV
20
150 mV
mA
dB
μV
RMS
μF
Input High Threshold
V
IH
V = 5.5V
IN
1.6
V
Input Low Threshold
V
IL
V = 3.0V
IN
0.4 V
wwwIn.pDuataHSihgeheCt4uUrr.econmt
I
IH
V = 5.5V
IN
-1 +1 μA
Input Low Current
I
IL
V = 5.5V
IN
-1 +1 μA
SemWire Bit Rate
f
SWIF
10 75 kbit/s
SemWire Start-up Time(5)
tEN
1 ms
SemWire Disable Time(6)
tDIS
10 ms
SemWire Data Latch Delay(7)
D
DL
5 bit
Notes:
(1) ΔV is the voltage difference between any two LEDs.
F
(2) Current matching equals ± [I - I ] / [I + I ].
BL(MAX) BL(MIN
BL(MAX) BL(MIN)
(3) Test voltage is V = 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically V = 3.2V for white LEDs.
OUT OUT
(4) Dropout is defined as (VIN- VLDO1) when VLDO1 drops 100mV from nominal. Dropout does not apply to LDO2 since it has a maximum output voltage
of 1.8V.
(5) The SemWire start-up time is the minimum period that the SWIF pin must be held high to enable the part before commencing
communication.
(6) The SemWire disable time is the minimum period that the SWIF pin must be pulled low to shut the part down.
(7) The SemWire data latch delay is the maximum duration after communication has ended before the register is updated.
5
5 Page 
SC624
Block Diagram
VIN 19
VIN
C1+ C1-
18 20
C2+ C2-
17 1
mAhXLifeTM Fractional
Charge Pump
(1x, 1.5x, 2x)
VOUT
SWIF 11
GREF 9
SemWireTM
Digital
Interface
and Logic
Control
BYP 13
Bandgap
Reference
NC 10
NC 12
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AGND 8
Oscillator
Current
Setting
DAC
Voltage
Setting
DAC
VIN
LDO1
VIN
LDO2
16 VOUT
2 PGND
4 BL1
5 BL2
6 BL3
7 BL4
3 NC
15 LDO1
14 LDO2
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet SC624.PDF ] | |
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