R2A20101BM Datasheet, PDF (1/10 Pages) Renesas Technology Corp – Monolithic Synchronous Step-Down DC/DC Converter

R2A20101BM/NP
Monolithic Synchronous Step-Down DC/DC Converter
REJ03D0790-0300
Rev.3.00
May 14, 2008
Features
• Built-in low Ron power MOS FETs
Pch Ron = 0.30 Ω (Typ), Nch Ron = 0.14 Ω (Typ)
• High switching frequency: 2 MHz (Max)
• Output current: 650 mA (Max)
• Output ON/OFF control
• Vout control
• Power good monitor
• Current share for redundant power supply operation
• Vout = 0.5 V to (VIN – 0.5) V
Application
• POL (Point of Load) power supplies
• Power supply for microcomputer systems
MCU-Core, I/O, Memory (DDR, SRAM, FLASH, HDD, etc.), FPGA, DSP, Graphic Processor
• Battery powered equipment systems
Cellular phone (CDMA power amplifier, MCU, DSP, ASIC), PDA, Digital camera, Portable game, Handy terminal
Operating Circuit Example
Vin
2.5V to 5.5V
Cin
4.7µF
Power Good
Signal Output
Error Amp. Output
(for Current Share)
Vref Input
(for Vout Control)
R2A20101
VIN
LX
ON/OFF
PGND
PWGD
CRFB
EAO
VFB
VREF
AGND
(Internal Vref = 0.5V)
Notes: 1. All ceramic capacitor
2. Rcf1 : Rcf2(recommend) = 3 : 2
3. fsw is adjustable by Ccf1, Rcf1, and Rcf2.
L1
2.2µH
Rcf2
68kΩ
Rcf1
100kΩ
Iout: Up to 650mA
Ccf1
47pF _Rvf2
390kΩ
Rvf1
150kΩ
Vout
1.8V
Cout
4.7µF
REJ03D0790-0300 Rev.3.00 May 14, 2008
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