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PDF SC624A Data sheet ( Hoja de datos )
| Número de pieza | SC624A | |
| Descripción | LED Light Management Unit Charge Pump | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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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
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
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
SC624A
LED Light Management Unit
Charge Pump, 4 LEDs, Dual LDOs,
and I2C Interface
Description
The SC624A 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 SC624A also
provides two low-dropout, low-noise linear regulators for
powering a camera module or other peripheral circuits.
The SC624A uses an I2C compatible serial interface. The
interface controls all functions of the device, including
backlight current and two LDO voltage outputs.
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.
www.DataSheet4U.com
Typical Application Circuit
VBAT
CIN
1μF
I2C Data
I2C Clock
Enable Control
CBYP
22nF
June 27, 2007
VIN VOUT
SDA SC624A
SCL
EN
BYP
BL 1
BL 2
BL 3
BL 4
COUT
2.2μF
MAIN BACKLIGHT
AGND
PGND
LDO 1
LDO 2
VLDO1 = 2.5V to 3.3V
VLDO2 = 1.5V to 1.8V
C1+ C1- C2+ C2-
C1 C2
1μF 1μF
CLDO1
1μF
CLDO2
1μF
© 2007 Semtech Corporation
US Patents: 6,504,422; 6,794,926
1
1 page  
SC624A
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min Typ
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 (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 
SC624A
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
Pin Name
C2-
PGND
NC
BL1
BL2
BL3
BL4
AGND
SCL
NC
11 SDA
12 EN
13 BYP
14 LDO2
15 LDO1
www.Dat1a6Sheet4U.com VOUT
17 C2+
18 C1+
19 VIN
20 C1-
T THERMAL PAD
Pin Function
Negative connection to bucket capacitor 2 — requires a 1μF capacitor connected to C2+
Ground pin for high current charge pump
Unused pin — do not terminate
Current sink output for main backlight LED 1 — leave this pin open if unused
Current sink output for main backlight LED 2 — leave this pin open if unused
Current sink output for main backlight LED 3 — leave this pin open if unused
Current sink output for main backlight LED 4 — leave this pin open if unused
Analog ground pin — connect to ground and separate from PGND current
I2C clock input pin
Unused pin — do not terminate
I2C bi-directional data pin — used for read and write operations for all internal registers (refer to
Register Map and I2C Interface sections)
Chip enable — active high — low state resets all registers (see register map table)
Bypass pin for voltage reference — connect with a 22nF capacitor to AGND
Output of LDO2 — connect with a 1μF capacitor to AGND
Output of LDO1 — connect with a 1μF capacitor to AGND
Charge pump output — all LED anode pins should be connected to this pin — requires a 2.2μF
capacitor to PGND
Positive connection to bucket capacitor 2 — requires a 1μF capacitor connected to C2-
Positive connection to bucket capacitor 1 — requires a 1μF capacitor connected to C1-
Battery voltage input — connect with a 1μF capacitor to PGND
Negative connection to bucket capacitor 1 — requires a 1μF capacitor connected to C1+
Thermal pad for heatsinking purposes — connect to ground plane using multiple
vias — not connected internally
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet SC624A.PDF ] | |
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