SC621 PDF даташит
Спецификация SC621 изготовлена «Semtech Corporation» и имеет функцию, называемую «LED Light Management Unit». |
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Детали детали
Номер произв | SC621 |
Описание | LED Light Management Unit |
Производители | Semtech Corporation |
логотип |
23 Pages
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POWER MANAGEMENT
SC621
LED Light Management Unit
Charge Pump, 4 LEDs, 400mA Flash LED,
Dual LDOs, and SemWireTM Interface
Features
Description
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
Two programmable 200mA 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
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
Lead-free and halogen-free
WEEE and RoHS compliant
Applications
Cellular phone backlighting and flash
PDA backlighting and flash
Camera I/O and core power
The SC621 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 SC621 also
provides two low-dropout, low-noise linear regulators for
powering a camera module or other peripheral circuits.
The SC621 uses the proprietary SemWireTM single wire
interface. The interface controls all functions of the
device, including backlight and flash currents as well as
two LDO voltage outputs. 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.
The two LDOs can be enabled when the device is in sleep
mode. Total current reduces to 0.1μA in shutdown.
Typical Application Circuit
VBAT
CIN
2.2μF
SemWire
Interface
Flash
Control
CBYP
22nF
VIN VOUT
SWIF
FLEN SC621
BYP
GREF
AGND
PGND
BL1
BL2
BL3
BL4
FL
LDO1
LDO2
COUT
4.7μF
MAIN BACKLIGHT
FLASH
VLDO1 = 2.5V to 3.3V
VLDO2 = 1.5V to 1.8V
C1+ C1- C2+ C2-
C1
2.2μF
C2
2.2μF
CLDO1
1μF
CLDO2
1μF
US Patents: 6,504,422; 6,794,926
October 20, 2009
© 2009 Semtech Corporation
1
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SC621
Pin Configuration
20 19 18 17 16
C2-
PGND
FL
BL1
BL2
1
2
3
4
5
TOP VIEW
T
15 LDO1
14 LDO2
13 BYP
12 NC
11 SWIF
6 7 8 9 10
Ordering Information
Device
Package
SC621ULTRT(1)(2)
MLPQ-UT-20 3×3
SC621EVB
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Lead-free packaging only. Device is WEEE and RoHS compliant,
and halogen-free.
MLPQ-UT-20; 3x3, 20 LEAD
θ = 35°C/W
JA
Marking Information
621
yyww
xxxx
yyww = Date Code
xxxx = Semtech Lot No.
2
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SC621
Absolute Maximum Ratings
Recommended Operating Conditions
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
VOUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VOUT + 0.3)
Pin Voltage - All Other Pins (V) . . . . . . . . . . . -0.3 to (VIN + 0.3)
VOUT Short Circuit Duration. . . . . . . . . . . . . . . . Continuous
VLDO1, VLDO2 Short Circuit Duration. . . . . . . Continuous
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ambient Temperature Range (°C) . . . . . . . . -40 < TA < +85
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 < VIN < 5.5
VOUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 < VOUT< 5.25
Voltage Difference between any two LEDs (V) . . . . . . <1.2
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) . . . . 35
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JESD22-A114-B.
(2) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise noted, T = +25°C for Typ, -40ºC to +85°C for Min and Max, T = 125ºC, V = 3.0V to 4.2V, C = C = C = 2.2μF,
A
J(MAX)
IN
IN 1 2
C = 4.7μF (ESR = 0.03Ω), ΔV ≤ 1.2V(1)
OUT F
Parameter
Symbol
Conditions
Min Typ Max Units
Supply Specifications
Shutdown Current
Total Quiescent Current
I
Q(OFF)
I
Q
Shutdown, V = 4.2V
IN
Sleep (LDOs off ), SWIF = V
IN
Sleep (LDOs on), SWIF = V ,
IN
V > (V + 300mV), I < 200mA
IN LDO
LDO
Charge pump in 1x mode, 4 backlights on
0.1 2
100 160
220 340
3.8 4.65
μA
μA
Charge pump in 1.5x mode, 4 backlights on
4.6 5.85 mA
Charge pump in 2x mode, 4 backlights on
4.6 5.85
Fault Protection
Output Short Circuit
Current Limit
Over-Temperature
Flash Mode Safety Timer(2)
I
OUT(SC)
T
OTP
t
FL(MAX)
VOUT pin shorted to GND
Flash sink active
300
160
0.75 1.00
1.25
mA
°C
s
3
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