SC623 Datasheet PDF - Semtech Corporation
| Part Number | SC623 | |
| Description | LED Light Management Unit Charge Pump | |
| Manufacturers | Semtech Corporation | |
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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
Flash LED — 400mA max in flash mode, 250mA max
continuous for spotlight
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
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
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SC623
LED Light Management Unit
Charge Pump, 4 LEDs, 400mA Flash LED,
and SemWireTM Interface
Description
The SC623 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 SC623 uses the proprietary SemWireTM single wire
interface. The interface controls all functions of the device,
including backlight and flash currents. The single wire
implementation minimizes microcontroller and interface
pin counts. The flash/spotlight output is triggered via
either the SemWire interface or a dedicated pin.
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.
Typical Application Circuit
VBAT
CIN
2.2μF
SemWire
Interface
Flash
Control
VIN VOUT
SWIF
FLEN SC623
GREF
AGND
PGND
BL1
BL2
BL3
BL4
FL
C1+ C1- C2+ C2-
C1
2.2μF
C2
2.2μF
COUT
4.7μF
June 27, 2007
© 2007 Semtech Corporation
MAIN BACKLIGHT
FLASH
US Patents: 6,504,422; 6,794,926
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SC623
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min Typ Max Units
Digital I/O Electrical Specifications (FLEN, SWIF)
Input High Threshold
V
IH
V = 5.5V
IN
1.6
V
Input Low Threshold
V
IL
V = 3.0V
IN
0.4 V
Input High Current
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)
t
EN
1 ms
SemWire Disable Time(6)
t
DIS
10 ms
SemWire Data Latch Delay(7)
D
DL
5 bit
Notes:
(1) ΔV is the voltage difference between any two LEDs.
F
(2) Once tripped, flash output will remain disabled until FLEN pin is cycled or reset via serial interface.
(3) Current matching equals ± [I - I ] / [I + I ].
BL(MAX) BL(MIN
BL(MAX) BL(MIN)
(4) Test voltage is VOUT = 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically VOUT = 3.2V for white LEDs.
(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.
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for SC623 electronic component. |
| Information | Total 21 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ SC623.PDF Datasheet ] | |
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