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SC654ULTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
© 2009 Semtech Corporation
POWER MANAGEMENT
1
US Patents: 6,504,422; 6,794,926
Typical Application Circuit
SC654
Light Management Unit for
6 LEDs with SemPulseTM Interface
SC654
IN
SPIF
GND
OUT
BL1
BL5
C
IN
2.2μF
BL6
C1+
From
Microprocessor
V
BAT
= 2.9 to 5.5V
C
OUT
2.2μF
C2
2.2μF
C1
2.2μF
BL2
BL3
BL4
C2+C1- C2-
Features
Input supply voltage range — 2.9V to 5.5V
Very high e ciency charge pump driver system with
three modes — 1x, 1.5x and 2x
Six 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  oat detection
Automatic sleep mode (LEDs o ) — I
Q
= 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
Description
The SC654 is a high e ciency 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 six
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 SC654 uses the proprietary SemPulse
TM
single wire
interface to control all functions of the device, including
backlight currents. The single wire interface minimizes
microcontroller and interface pin counts. The six LEDs
can be grouped in up to three separate banks that can be
independently controlled.
The SC654 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
SC654 provides a complete LED driver solution with a
minimal PCB footprint.
January 30, 2009
2
Pin Con guration
Marking Information
Ordering Information
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Lead-free package only. Device is WEEE and RoHS compliant.
MLPQ-UT-14; 2x2, 14 LEAD
θ
JA
= 127°C/W
SC654
TOP VIEW
1
2
3
8
9
10
45
6
7
14 13 12 11
BL3 C2+
SPIF
BL2
BL5
BL4
BL1
IN
OUT
C1+
C1-
BL6
GND
C2-
Device Package
SC654ULTRT
(1)(2)
MLPQ-UT-14 2×2
SC654EVB Evaluation Board
...0W
yw
0W = Marking code for SC654
yw = Date Code
3
Exceeding the above speci cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters
speci ed in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JESD22-A114
(2) ∆V
F(max)
= 1.0V when V
IN
= 2.9V, higher V
IN
supports higher ∆V
F(max)
(3) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB per JESD51 standards.
Absolute Maximum Ratings
IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V
OUT
+ 0.3)
Pin Voltage — All Other Pins (V) . . . . . . . . -0.3 to ( V
IN
+ 0.3)
OUT Short Circuit Duration . . . . . . . . . . . . . . . . Continuous
ESD Protection Level
(1)
(kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Unless otherwise noted, T
A
= +25°C for Typ, -40°C to +85°C for Min and Max, T
J(MAX)
= 125°C, V
IN
= 3.7 V, C
IN
= C
1
= C
2
= C
OUT
= 2.2µF (ESR = 0.03)
(1)
Electrical Characteristics
Recommended Operating Conditions
Ambient Temperature Range (°C) . . . . . . . . -40 ≤ T
A
≤ +85
Input Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . 2.9 ≤ V
IN
≤ 5.5
Output Voltage (V) . . . . . . . . . . . . . . . . . . . . . 2.5 ≤ V
OUT
≤ 5.25
Voltage Di erence between any two LEDs (V). . ∆V
F
< 1.0
(2)
Thermal Information
Thermal Resistance, Junction to Ambient
(3)
(°C/W) . . 127
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . .+150
Storage Temperature Range (°C) . . . . . . . . . . . -65 to +150
Peak IR Re ow Temperature (10s to 30s) (°C) . . . . . . +260
SC654
Parameter Symbol Conditions Min Typ Max Units
Shutdown Current I
Q(OFF)
0.1 2 µA
Total Quiescent Current I
Q
All outputs disabled, SPIF = V
IN
(2)
60 100 µA
Charge pump enabled, 1x Mode, all LEDs on,
I
BLn
= 0.5mA
1.8
mA
Charge pump in 1x mode, 2.9V <V
IN
< 4.2V, all LEDs
on, I
BLn
= 25mA
5.4
Charge pump in 1.5x, 2x mode, 2.9V <V
IN
< 4.2V, all
LEDs on, I
BLn
= 25mA
6.5
Maximum Total Output Current I
OUT(MAX)
V
IN
> 2.9V, sum of all active LED currents,
V
OUT(MAX)
= 4.2V
150 mA
Backlight Current Setting I
BLn
Nominal setting for BL1 thru BL6 0 25 mA
Backlight Current Matching I
BL-BL
I
BLn
= 12mA
(3)
-3.5 ±0.5 +3.5 %
Backlight Current Accuracy I
BL_ACC
I
BLn
= 12mA -8 ±1.5 +8 %
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

SC654ULTRT

Mfr. #:
Buy SC654ULTRT
Manufacturer:
Semtech
Description:
IC LED DRIVER RGLTR 25MA 14MLPQ
Lifecycle:
New from this manufacturer.
Delivery:
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