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PDF R2A20101NP Data sheet ( Hoja de datos )

Número de pieza R2A20101NP
Descripción Monolithic Synchronous Step-Down DC/DC Converter
Fabricantes Renesas Technology 
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No Preview Available ! R2A20101NP Hoja de datos, Descripción, Manual

R2A20101BM/NP
www.DataSheet4U.com
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 (Typ), Nch Ron = 0.14 (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
68k
Rcf1
100k
Iout: Up to 650mA
Ccf1
47pF Rvf2
390k
Rvf1
150k
Vout
1.8V
Cout
4.7µF
REJ03D0790-0300 Rev.3.00 May 14, 2008
Page 1 of 9

1 page




R2A20101NP pdf
R2A20101BM/NP
Main Characteristics
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
1
10000
2700
1100
1000
CR Feedback Constant vs. Switching Frequency
www.DataSheet4U.com
Rcf1: 3.3k
Rcf2: 2.2k
Rcf1: 10k
Rcf2: 6.8k
Rcf1: 33k
Rcf2: 22k
Rcf1: 330k
Rcf2: 220k
10
100
Ccf1 (pF)
1000
Range of CR Feedback Constant Selection
10000
Range of
CR feedback constant selection
100
33
12
10
1
2.2
10 100 220
Rcf2 (k)
1000
Reference Voltage vs. Ambient Temperature
0.520
0.515
0.510
0.505
0.500
0.495
0.490
0.485
0.480
–50 –25 0
25 50 75 100 125
Ta (°C)
Switching Operating Current vs. Ambient Temperature
14
12
10
8
6
4
2
0
–50 –25 0 25 50 75 100 125
Ta (°C)
REJ03D0790-0300 Rev.3.00 May 14, 2008
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