|
|
PDF SC633 Data sheet ( Hoja de datos )
| Número de pieza | SC633 | |
| Descripción | Fixed 5.3V Output Charge Pump Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SC633 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
POWER MANAGEMENT
Features
Input voltage range — 2.9V to 5.5V
VOUT tolerance — 5.3V ±3%
Continuous output current — 275mA, VIN=3V
Peak output current — 400mA
Three charge pump modes — 1x, 1.5x and 2x
Output ripple ≤ 40mVPP for IOUT ≤ 400mA
Short circuit, over-voltage, and over-temperature
protection
Soft-start functionality
Shutdown current — 0.1µA, typical
Ultra thin package — 2 x 2 x 0.6 (mm)
Lead-free and halogen-free
WEEE and RoHS compliant
Applications
Mobile phones
MP3 players
USB On-The-Go
Multi-LED backlit LCDs
Compact flash/CF+ products
PMPs
Digital video cameras
Digital still cameras
PDAs
SC633
Fixed 5.3V Output
Charge Pump Regulator
Description
The SC633 is a high-current voltage regulator using
Semtech’s proprietary low-noise charge pump technol-
ogy. Performance is optimized for use in single Li-Ion
battery cell applications. The regulator provides the per-
formance of a linear, low drop-out (LDO) voltage regulator
when the input is greater than 5.3V. Unlike an LDO, drop-
out is avoided when the input is less than 5.3V. Instead, a
charge pump is activated to provide voltage boost and
the head-room needed for voltage regulation.
Only two 2.2µF bucket capacitors are required to deliver
the full output current. The charge pump provides a low
EMI solution compared to inductive boost regulators.
The SC633’s charge pump has three modes of operation:
2x, 1.5x, and 1x modes. The 2x and 1.5x modes deliver
current to the load in each of two phases. The 1x mode
turns off the charge pump, delivering current through an
LDO. When active, the charge pump provides low-ripple
operationhttp://www.DataSheet4U.net/ at 200kHz, which is typically less than 30mVpp
at the output. The SC633 is capable of delivering 275mA
continuous current, with peak current to 400mA. A 22µF
output capacitor is used for decoupling the load and for
smoothing mode transitions. Hysteresis is provided to
prevent chatter between charge pump modes.
Typical Application Circuit
VBAT
C IN IN
2 2 µF
OUT
VOUT = 5.3V @ 275mA
COUT
2 2 µF
SC633
C h ip
enable
EN C1+
C1-
C2+
GND C2-
C1
2 .2 µF
C2
2 .2 µF
Rev 2.0
US Patent: 7,808,220
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Typical Characteristics
Load Regulation
SC633
Line Regulation
PSRR versus Frequency — 1.0x Mode
Vin=5.5V, Vout=5.3V, 50mA, 1X mode
PSRR versus Frequency — 1.5x Mode
Vin=4.7V, Vout=5.3V, 50mA, 1.5X mode
http://www.DataSheet4U.net/
CIN=COUT=22µF (0805)
C1=C2=2.2µF (0603)
CIN=COUT=22µF (0805)
C1=C2=2.2µF (0603)
PSRR versus Frequency — 2x Mode
Vin=3.5V, Vout=5.3V, 50mA, 2X mode
Quiescent Current
VOUT = 5.3V, IOUT = 0mA
CIN=COUT=22µF (0805)
C1=C2=2.2µF (0603)
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
SC633
Applications Information (continued)
optimum transient performance, when the input voltage
reaches the mode transition thresholds.
that prevents the device from re-enabling until the junc-
tion temperature is reduced by 20°C.
Protection Circuitry
The SC633 also provides protection circuitry that prevents
the device from operating in an unspecified state. These
functions include:
• Over-Current Protection (OCP)
• Short-Circuit Current Protection (SCCP)
• Over-Temperature Protection (OTP)
Over-Current Protection
Over-current protection is provided to limit the output
current. When VOUT is greater than 2V, OCP limits the output
to 1A typical. The threshold at 2V allows the device to
recover from excessive voltage droop during an over
current.
Short-Circuit Current Protection
Short-circuit current protection is provided to limit the
current that can be sourced when the output is shorted to
ground. When a short circuit forces VOUT to drop below 2V,
the SCCP detects the condition and limits the output
current to 600mA (typical).
Over-Temperature Protection
The over-temperature circuit helps prevent the device
from overheating and experiencing a catastrophic failure.
When the junction temperature exceeds 165°C, the device
is disabled. It remains disabled until the junction tempera-
ture drops below this threshold. Hysteresis is included
Capacitor Selection
The SC633 is designed to use low-ESR ceramic capacitors
for the input and output bypass capacitors as well as the
charge pump bucket capacitors. Ideal performance is
achieved when the bucket capacitors are exactly equal.
The value of input and output decoupling capacitors will
vary with system requirements. For best ripple perfor-
mance CIN and COUT are normally 22µF and the bucket
capacitors C1 and C2 are 2.2µF. For low profile designs, two
10µF capacitors may be used in place of each 22µF.
When selecting capacitors for an application, first consider
the DC voltage characteristic of the capacitor. The value
of capacitance at the DC operating voltage may be con-
siderably lower than the rated value. The following table
lists recommended capacitor values which have been
chosen to minimize the impact of this limitation.
Table 1 — Recommended Capacitors
http://www.DataSheet4U.net/
Capacitor
Value
μF
Case
Size
Notes
CIN , COUT
CBUCKET
CBUCKET
Typical output VPP ≤ 20mV in all
charge pump modes
22 0805
Typical input ripple ≤ 100mV in all
charge pump modes
2.2
0603
Required for the full rated output
current
2.2
0402
Useful for load current up to
300mA
NOTE: Use only X5R type capacitors, with a 6.3V rating or higher
The highest capacitance values in the smallest package
sizes will tend to have poor DC voltage characteristics.
The highest value 0402 size capacitor retains as little as
35% of its rated value at 5VDC. The same value chosen in
the next larger package size, 0603, will retain about 60%
of its rated value at 5VDC.
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SC633.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SC630 | Fixed 3.3V High Output Charge Pump Buck/Boost Regulator | Semtech |
| SC630A | 1MHz Fixed 3.3V Output Charge Pump Regulator | Semtech |
| SC631 | Fixed 4.4V Output Charge Pump Regulator | Semtech |
| SC632 | Fixed 5.0V Output Charge Pump Regulator | Semtech |
| 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 |