|
|
PDF SC622 Data sheet ( Hoja de datos )
| Número de pieza | SC622 | |
| Descripción | LED Light Management Unit Charge Pump | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SC622 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
|
No Preview Available !
POWER MANAGEMENT
Features
Input supply voltage range — 3.0V to 5.5V
Charge pump modes — 1x, 1.5x and 2x
Flash LED — 400mA max in flash mode, 250mA max
continuous for spotlight
Two user-configurable 100mA low-noise LDO
regulators
Charge pump frequency — 250kHz
SemWireTM single wire interface — up to 75kbit/s
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 flash
PDA flash
Camera I/O and core power
SC622
LED Light Management Unit
Charge Pump, 400mA Flash LED, Dual
LDOs, and SemWireTM Interface
Description
The SC622 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 continuous or bursted current
to a flash LED using a dedicated flash driver current sink.
The load and supply conditions determine whether the
charge pump operates in 1x, 1.5x, or 2x mode. A flash-
timeout feature disables the flash if active for longer than
1 second. The SC622 also provides two low-dropout, low-
noise linear regulators for powering a camera module or
other peripheral circuits.
The SC622 uses the proprietary SemWireTM single wire
interface. The interface controls all functions of the device,
including flash current and 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.
www.DataSheet4U.com
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
VIN
SWIF
FLEN
VOUT
SC622
COUT
4.7μF
FLASH
July 19, 2007
CBYP
22nF
BYP
GREF
AGND
PGND
FL
LDO1
LDO2
VLDO1 = 2.5V to 3.3V
VLDO2 = 1.5V to 1.8V
C1+ C1- C2+ C2-
C1
2.2μF
C2
2.2μF
CLDO1
1.0μF
CLDO2
1.0μF
US Patents: 6,504,422; 6,794,926
© 2007 Semtech Corporation
1
1 page  
SC622
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min Typ Max Units
LDO Electrical Specifications (continued)
Load Regulation
Dropout Voltage(3)
ΔV
LOAD
V
D
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
Current Limit
Power Supply
Rejection Ratio
Output Voltage Noise
Minimum Output Capacitor
I
LIM
PSRR
LDO1
PSRR
LDO2
e
n-LDO1
e
n-LDO2
C
LDO(MIN)
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, CLDO = 1μF,
I = 50 mA, V = 3.7V
LDO2
IN
Digital I/O Electrical Specifications (FLEN, SWIF)
200
100
50
60
100
50
1
25
mV
20
150 mV
mA
dB
μV
RMS
μF
Input High Threshold
V
IH
V = 5.5V
IN
1.6
V
Input Low Threshold
V
IL
V = 3.0V
IN
0.4 V
wwwIn.pDuataHSihgeheCt4uUrr.econmt
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(4)
tEN
1 ms
SemWire Disable Time(5)
tDIS
10 ms
SemWire Data Latch Delay(6)
D
DL
5 bit
Notes:
(1) Once tripped, flash output will remain disabled until FLEN pin is cycled or reset via serial interface.
(2) Test voltage is V = 4.5V — a relatively extreme LED voltage — to force a transition during test. Typically V = 3.3V for the white LED at
OUT OUT
100mA.
(3) Dropout is defined as (VIN- VLDO1) when VLDO1 drops 100mV from nominal. Dropout does not apply to LDO2 since it has a maximum output voltage
of 1.8V.
(4) The SemWire start-up time is the minimum period that the SWIF pin must be held high to enable the part before commencing
communication.
(5) The SemWire disable time is the minimum period that the SWIF pin must be pulled low to shut the part down.
(6) The SemWire data latch delay is the maximum duration after communication has ended before the register is updated.
5
5 Page 
SC622
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
Pin Name
C2-
PGND
FL
NC
NC
NC
NC
AGND
GREF
FLEN
11 SWIF
12 NC
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 2.2μF capacitor connected to C2+
Ground pin for high current charge pump and Flash LED driver
Current sink output for flash LED(s)
Unused pin — do not terminate
Unused pin — do not terminate
Unused pin — do not terminate
Unused pin — do not terminate
Analog ground pin — connect to ground and separate from PGND current
Ground reference — connect to ground
Control pin for flash LED(s) — high = ON, low = OFF
SemWire single wire interface pin — used to enable/disable the device and to set up all internal
registers (refer to Register Map and SemWire Interface sections)
Unused pin — do not terminate
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 4.7μF capacitor to PGND
Positive connection to bucket capacitor 2 — requires a 2.2μF capacitor connected to C2-
Positive connection to bucket capacitor 1 — requires a 2.2μF capacitor connected to C1-
Battery voltage input — connect with a 2.2μF capacitor to PGND
Negative connection to bucket capacitor 1 — requires a 2.2μF capacitor connected to C1+
Thermal pad for heatsinking purposes — connect to ground plane using multiple vias — not
connected internally
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet SC622.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SC620 | Octal LED Driver | Semtech Corporation |
| SC621 | LED Light Management Unit | Semtech Corporation |
| SC621A | Charge Pump | Semtech Corporation |
| SC622 | LED Light Management Unit Charge Pump | Semtech Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |