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SC658 데이터시트 PDF




Semtech에서 제조한 전자 부품 SC658은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 SC658 자료 제공

부품번호 SC658 기능
기능 Backlight Driver
제조업체 Semtech
로고 Semtech 로고


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SC658 데이터시트, 핀배열, 회로
POWER MANAGEMENT
Features
Input supply voltage range — 2.9V to 5.5V
Very high efficiency charge pump driver system with
three modes — 1x, 1.5x and 2x
Four programmable current sinks — 0mA to 25mA
Up to three LED grouping options
Fade-in/fade-out feature for main LED bank
Charge pump frequency — 250kHz
SemPulse single wire interface
Backlight current accuracy — ±1.5% typical
Backlight current matching — ±0.5% typical
LED float detection
Automatic sleep mode (LEDs off ) IQ = 60µA (typ.)
Shutdown current — 0.1µA (typical)
Ultra-thin package — 2 x 2 x 0.6 (mm)
Fully WEEE and RoHS compliant
Applications
Cellular phones, smart phones, and PDAs
LCD modules
Portable media players
Digital cameras
Personal navigation devices
Display/keypad backlighting and LED indicators
SC658
Backlight Driver for 4 LEDs
with SemPulseTM Interface
Description
The SC658 is a high efficiency charge pump LED driver
using Semtech’s proprietary charge pump technology.
Performance is optimized for use in single-cell Li-ion
battery applications.
The charge pump provides backlight current utilizing 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 SC658 uses the proprietary SemPulseTM single wire
interface to control all functions of the device, including
backlight currents. The single wire interface minimizes
microcontroller and interface pin counts. The four LEDs
can be grouped in up to three separate banks that can be
independently controlled.
The SC658 enters sleep mode when all the LED drivers are
disabled. In this mode, the quiescent current is reduced
while the device continues to monitor the SemPulse
interface.
With a 2 x 2 (mm) package and four small capacitors, the
SC658 provides a complete LED driver solution with a
minimal PCB footprint.
Typical Application Circuit
VBAT = 2.9 to 5.5V
CIN
2.2µF
From
Microprocessor
IN OUT
SC658
SPIF
BL1
BL2
BL3
BL4
COUT
2.2µF
April 3, 2009
GND
C1+ C1- C2+ C2-
C1
2.2µF
C2
2.2µF
© 2009 Semtech Corporation
US Patents: 6,504,422; 6,794,926





SC658 pdf, 반도체, 판매, 대치품
SC658
Electrical Characteristics (continued)
Parameter
1x Mode to 1.5x Mode
Falling Transition Input Voltage
1.5x Mode to 1x Mode Hysteresis
1.5x Mode to 2x Mode
Falling Transition Input Voltage
Current Sink Off-State
Leakage Current
Charge Pump Frequency
Output Short Circuit
Current Limit
Under Voltage Lockout
Over-Voltage Protection
Over-Temperature
OT Hysteresis
Symbol
VTRANS1x
VHYST1x
VTRANS1.5x
IBLn(off )
fPUMP
IOUT(SC)
VUVLO-OFF
VUVLO-HYS
VOVP
TOT
TOT-HYS
Conditions
IOUT = 40mA, IBLn = 10mA, VOUT = 3.2V
IOUT = 40mA, IBLn = 10mA, VOUT = 3.2V
IOUT = 40mA, IBLn = 10mA, VOUT = 4.2V(4)
VIN = VBLn = 4.2V
VIN = 3.2V
OUT pin shorted to GND
VOUT > 2.5V
Increasing VIN, lock-out released
Hysteresis
OUT pin open circuit, VOUT = VOVP,
rising threshold
Rising temperature
Min Typ Max Units
3.24 V
250 mV
3.07 V
0.1 1 µA
250 kHz
60
mA
300
2.7 V
800 mV
5.7 6.0
V
160 °C
20 °C


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SC658 전자부품, 판매, 대치품
SC658
Typical Characteristics (continued)
Backlight Accuracy (4 LEDs) — 12mA Each
8
6
4
2 ACC Max %
0
-2
ACC Min %
-4
-6
-8
4.2 3.9 3.6 3.3
VIN (V)
3 2.7
Ripple — 1x Mode
CIN = COUT = 4.7µF, 4 LEDs, — 15mA each
VIN (100mV/div)
Output Short Circuit Current Limit
VOUT (1V/div)
0
IOUT (50mA/div)
0
1ms�/�d��iv�
Ripple — 1.5x Mode
CIN = COUT = 4.7µF, VIN = 2.9V, 4 LEDs, — 15mA each
VIN (100mV/div)
VOUT (100mV/div)
IBL (10mA/div)
VOUT (100mV/div)
IBL (10mA/div)
20µs�/�d��iv�
Ripple — 2x Mode
CIN = COUT = 4.7µF, VIN = 2.9V, 4 LEDs — 15mA each
VIN (100mV/div)
20µs�/�d��iv�
Output Open Circuit Protection
VBL (500mV/div)
VOUT (100mV/div)
IBL (10mA/div)
20µs�/�d��iv�
VOUT (1V/div)
IBL (10mA/div)
0
20µs�/�d��iv�


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