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Número de pieza | R2A20101NP | |
Descripción | Monolithic Synchronous Step-Down DC/DC Converter | |
Fabricantes | Renesas Technology | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de R2A20101NP (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
No Preview Available ! R2A20101BM/NP
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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
Page 1 of 9
1 page 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: 3.3kΩ
Rcf2: 2.2kΩ
Rcf1: 10kΩ
Rcf2: 6.8kΩ
Rcf1: 33kΩ
Rcf2: 22kΩ
Rcf1: 330kΩ
Rcf2: 220kΩ
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 (kΩ)
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
Page 5 of 9
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet R2A20101NP.PDF ] |
Número de pieza | Descripción | Fabricantes |
R2A20101NP | Monolithic Synchronous Step-Down DC/DC Converter | Renesas Technology |
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