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DC/DC Converter. R2A20101BM Datasheet

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DC/DC Converter. R2A20101BM Datasheet






R2A20101BM Converter. Datasheet pdf. Equivalent




R2A20101BM Converter. Datasheet pdf. Equivalent





Part

R2A20101BM

Description

Monolithic Synchronous Step-Down DC/DC Converter



Feature


www.DataSheet4U.com R2A20101BM/NP Monol ithic Synchronous Step-Down DC/DC Conve rter REJ03D0790-0300 Rev.3.00 May 14, 2 008 Features • Built-in low Ron powe r MOS FETs Pch Ron = 0.30 Ω (Typ), Nc h Ron = 0.14 Ω (Typ) • High switchi ng frequency: 2 MHz (Max) • Output cu rrent: 650 mA (Max) • Output ON/OFF c ontrol • Vout control • Power good monitor • Current share for redund.
Manufacture

Renesas Technology

Datasheet
Download R2A20101BM Datasheet


Renesas Technology R2A20101BM

R2A20101BM; ant 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, FLAS H, HDD, etc.), FPGA, DSP, Graphic Proce ssor • Battery powered equipment syst ems Cellular phone (CDMA power amplifie r, MCU, DSP, ASIC), PDA, Digital camera , Portable game, Handy termi.


Renesas Technology R2A20101BM

nal Operating Circuit Example Vin 2.5V to 5.5V Cin 4.7 µ F Power Good Signal Output Error Amp. Output (for Current S hare) Vref Input (for Vout Control) R2 A20101 VIN ON/ OFF PWGD EAO LX PGND CRF B VFB L1 2.2 µ H Iout: Up to 650mA Vout 1.8V Rcf2 68k Ω Ccf1 47pF Rvf 2 390k Ω Rvf1 150k Ω Rcf1 100k Ω Cout 4.7 µ F AGND VREF (Internal Vr ef = 0.5V) Notes: 1. All cer.


Renesas Technology R2A20101BM

amic capacitor 2. Rcf1 : Rcf2(recommend) = 3 : 2 3. fsw is adjustable by Ccf1, Rcf1, and Rcf2. REJ03D0790-0300 Rev.3. 00 May 14, 2008 Page 1 of 9 R2A20101BM /NP Block Diagram ON/OFF www.DataShee t4U.com SHDN Shut Down PWGD Power Good Comparator UVLO VIN Ref 1.15V 1.3MΩ VREF – + Vref × 10% + – PWM Co ntrol Logic LX PGND CRFB VFB AGND SS EAO 1MΩ 1.5kΩ Error Am.

Part

R2A20101BM

Description

Monolithic Synchronous Step-Down DC/DC Converter



Feature


www.DataSheet4U.com R2A20101BM/NP Monol ithic Synchronous Step-Down DC/DC Conve rter REJ03D0790-0300 Rev.3.00 May 14, 2 008 Features • Built-in low Ron powe r MOS FETs Pch Ron = 0.30 Ω (Typ), Nc h Ron = 0.14 Ω (Typ) • High switchi ng frequency: 2 MHz (Max) • Output cu rrent: 650 mA (Max) • Output ON/OFF c ontrol • Vout control • Power good monitor • Current share for redund.
Manufacture

Renesas Technology

Datasheet
Download R2A20101BM Datasheet




 R2A20101BM
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




 R2A20101BM
R2A20101BM/NP
Block Diagram
ON/OFF
PWGD
VREF
EAO
Shut Down
SHDN
UVLO
Ref 1.15V
Power Good
Comparator
+
1.3M
Vref × 10%
1.5k
+
SS
Error Amplifier
1M
www.DataSheet4U.com
VIN
PWM
Control
Logic
LX
PGND
CRFB
VFB
AGND
Absolute Maximum Ratings
Item
Symbol
Ratings
Power supply voltage
ON/OFF, PWGD, EAO, VREF,
LX, CRFB, VFB terminal voltage
VIN
VMAX
6
–0.3 to (VIN + 0.3)
PGND terminal voltage
Operating ambient temperature
VPGND
Topr(Ta)
–0.3 to +0.3
–40 to +85
Junction temperature 1
Tjmax1
+125
Junction temperature 2
Tjmax2
+150
Storage temperature
Tstg
–55 to +150
Notes: 1. Rated voltages are with reference to the AGND pin.
2. Operation by Tjmax2 is made within 24 hours through life.
Unit
V
V
V
°C
°C
°C
°C
(Ta = 25°C)
Note
1
1
1
2
REJ03D0790-0300 Rev.3.00 May 14, 2008
Page 2 of 9




 R2A20101BM
R2A20101BM/NP
Pin Arrangement
R2A20101BM
(CSP-15)
54321
A A5 A3 A1
B B4 B2
C C5 C3 C1
D D4 D2
E E5 E3 E1
F F4 F2
(Bottom view)
12
11
10
9
8
7
www.DataSheet4U.com
R2A20101NP
(QFN-24)
13 14 15 16 17 18
19
20
21
22
23
24
654321
(Bottom view)
Pin Description
Pin No.
R2A20101BM
(CSP-15)
R2A20101NP
(QFN-24)
Pin Name
Pin Function
A1, A3, A5
15, 16, 17
PGND
Power ground
B2, B4
11, 20
LX
Inductor connection node
C1, C3, C5
10, 21
VIN
Power supply voltage input
D4
22 ON/OFF
Output on/off control input
D2
9 CRFB
CR feedback input
E5
23 PWGD
Power good monitor output
E1
8 VFB
Feedback voltage input
F4
2 EAO
Error amplifier output (for current share)
E3
5 VREF
Vout control voltage input
F2
4 AGND
Analog ground (IC chip ground voltage)
Note: Please apply solder to pins 1, 3, 6, 7, 12, 13, 14, 18, 19, and 24 even though they are NC pins.
Solder on the underside pads improves heat-radiation characteristics.
REJ03D0790-0300 Rev.3.00 May 14, 2008
Page 3 of 9






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