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PDF BD8961NV Data sheet ( Hoja de datos )
| Número de pieza | BD8961NV | |
| Descripción | 2.0A 1ch Synchronous Buck Converter | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
4.5V to 5.5V, 2.0A 1ch
Synchronous Buck Converter with Integrated FET
BD8961NV
General Description
The BD8961NV is ROHM's high efficiency step-down
switching regulator designed to produce a voltage as
low as 3.3V from a supply voltage of 5V. It offers high
efficiency by using synchronous switches and provides
fast transient response to sudden load changes by
implementing current mode control.
Features
Fast Transient Response because of Current Mode
Control System
High Efficiency for All Load Ranges because of
Synchronous Switches (Nch/Pch FET)
Soft-Start Function
Thermal Shutdown and UVLO Functions
Short Circuit Protection with Time Delay Function
Shutdown Function
Key Specification
Input Voltage Range:
Output Voltage:
Output Current:
Switching Frequency:
Pch FET ON-Resistance:
Nch FET ON-Resistance:
Standby Current:
Operating Temperature Range:
4.5V to 5.5V
3.3V(Typ)
2.0A (Max)
1.0MHz(Typ)
200mΩ(Typ)
150mΩ(Typ)
0μA (Typ)
-25°C to +105°C
Package
W(Typ) x D(Typ) x H(Max)
Applications
Power Supply for LSI including DSP, Microcomputer and
ASIC
Typical Application Circuit
SON008V5060
5.00mm x 6.00mm x 1.00mm
CIN L
VCC
VCC,PVCC
EN SW
VOUT
RITH
VOUT
ITH
GND,PGND
CO
CITH
Figure 1. Typical Application Circuit
VOUT
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
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TSZ02201-0J3J0AJ00020-1-2
02.Oct.2014 Rev.002
1 page  
BD8961NV
Typical Performance Curves - continued
VCC=5V
Datasheet
VCC=5V
Ta=25°C
Output Current: IOUT [mA]
Figure 8. Efficiency vs Output Current
VCC=5V
PMOS
NMOS
Temperature: Ta [°C]
Figure 10. ON-Resistance VS Temperature
Temperature: Ta [°C]
Figure 9. Frequency VS Temperature
VCC=5V
Temperature: Ta [°C]
Figure 11. EN Voltage VS Temperature
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
5/21
TSZ02201-0J3J0AJ00020-1-2
02.Oct.2014 Rev.002
5 Page 
BD8961NV
Datasheet
4. Switching Regulator Efficiency
Efficiency η may be expressed by the equation shown below:
VOUT IOUT 100 POUT 100 POUT 100
VIN IIN
PIN POUT Pd
%
Efficiency may be improved by reducing the switching regulator power dissipation factors Pdα as follows:
Dissipation Factors:
(1) ON-Resistance Dissipation of Inductor and FET：Pd(I2R)
Pd(I 2 R) IOUT 2 (RCOIL RON )
Where:
RCOIL is the DC resistance of inductor
RON is the ON-Resistance of FET
IOUT is the output current
(2) Gate Charge/Discharge Dissipation：Pd(Gate)
PdGate Cgs f V 2
Where:
Cgs is the gate capacitance of FET
f is the switching frequency
V is the gate driving voltage of FET
(3) Switching Dissipation：Pd(SW)
PdSW VIN 2 CRSS IOUT f
I DRIVE
Where:
CRSS is the reverse transfer capacitance of FET
IDRIVE is the peak current of gate
(4) ESR Dissipation of Capacitor：Pd(ESR)
Pd(ESR) I RMS 2 ESR
Where:
IRMS is the ripple current of capacitor
ESR is the equivalent series resistance
(5) Operating Current Dissipation of IC：Pd(IC)
PdIC VIN ICC
Where:
ICC is the circuit current
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
11/21
TSZ02201-0J3J0AJ00020-1-2
02.Oct.2014 Rev.002
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet BD8961NV.PDF ] | |
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