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SC630A fiches techniques PDF

Semtech - 1MHz Fixed 3.3V Output Charge Pump Regulator

Numéro de référence SC630A
Description 1MHz Fixed 3.3V Output Charge Pump Regulator
Fabricant Semtech 
Logo Semtech 





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SC630A fiche technique
POWER MANAGEMENT
Features
Input voltage range — 2.95V to 5.5V
VOUT tolerance — 3.3V ±3%
Continuous output current — 300mA max
Three charge pump modes — 1x, 1.5x and 2x
Output ripple voltage 33mVPP , typical
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
Tablets
USB On-The-Go
Multi-LED backlit LCDs
Compact flash/CF+ products
Digital video cameras
DVI/HDMI ports
Wi-Fi base stations
Modems
Set-top boxes
SC630A
1MHz Fixed 3.3V Output
Charge Pump Regulator
Description
The SC630A is a high-current voltage regulator using
Semtech’s proprietary low-noise charge pump technol-
ogy. The charge pump provides a low EMI solution
compared to inductive boost regulators. Performance is
optimized for use in single Li-Ion battery cell applications.
The regulator provides the performance of a linear, low
drop-out (LDO) voltage regulator when the battery is
greater than 3.3V. Unlike an LDO, drop-out is avoided
when the battery is less than 3.3V. Instead, a charge pump
is activated to provide voltage boost and the head-room
needed for regulation.
The SC630A’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. Hysteresis is provided to prevent chatter between
charge pump modes. When active, the charge pump pro-
vides low-ripple operation at 1MHz. Typically the output
ripple is 1% of the output voltage — 33mVpp at 215mA.http://www.DataSheet4U.net/
A small 2.2µF capacitor is recommended for all four capaci-
tors. The full rated output current is provided when 2.2µF
is used for both bucket capacitors. At the output, a 2.2µF
capacitor decouples the load and provides smoothing for
mode transitions, while another 2.2µF is used to decouple
the input.
Typical Application Circuit
VBAT
CIN IN
2.2µF
OUT
VOUT = 3.3V @ 300mA
COUT
2.2µF
SC630A
Chip
enable
EN
GND
C1+
C1-
C2+
C2-
C1
2.2µF
C2
2.2µF
Rev. 1.1
© 2011 Semtech Corporation
US Patent: 7,808,220

datasheet pdf - http://www.DataSheet4U.net/

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