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PDF BD8964FVM Data sheet ( Hoja de datos )
| Número de pieza | BD8964FVM | |
| Descripción | 1.2A 1ch Synchronous Buck Converter | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
4.0V to 5.5V, 1.2A 1ch
Synchronous Buck Converter with
Integrated FET
BD8964FVM
General Description
The BD8964FVM is ROHM’s high efficiency step-down
switching regulator designed to produce a voltage as
low as 1V 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
PWM Control System
High Efficiency for All Load Ranges with
Synchronous Rectifier (Nch/Pch FET)
Soft-Start Function
Thermal Shutdown and UVLO Functions
Short-Circuit Protection with Time Delay Function
Shutdown Function
Key Specifications
Input Voltage Range:
Output Voltage Range:
Output Current:
Switching Frequency:
Pch FET ON-Resistance:
Nch FET ON-Resistance:
Standby Current:
Operating Temperature Range:
4.0V to 5.5V
1.0V to 1.8V
1.2A (Max)
1.0MHz (Typ)
350mΩ(Typ)
250mΩ(Typ)
0μA (Typ)
-25°C to +85°C
Package
W(Typ) x D(Typ) x H(Max)
Application
Power Supply for LSI including DSP, Microcomputer
and ASIC
Typical Application Circuit
MSOP8
2.90 mm x 4.00 mm x 0.90 mm
VCC
CIN L
EN VCC,PVCC
SW
ADJ
ITH GND,PGND
RITH
CO
CITH
VOUT
R2
R1
Figure 1. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
○ This product has no designed protection against radioactive rays
1/21
TSZ02201-0J3J0AJ00050-1-2
22.Jan.2015 Rev.003
1 page  
BD8964FVM
Typical Performance Curves – continued
[VOUT=1.5V]
Datasheet
VCC=5V
Ta=25°C
Output Current: IOUT [mA]
Figure 8. Efficiency vs Output Current
PMOS
NMOS
VCC=5V
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
TSZ02201-0J3J0AJ00050-1-2
22.Jan.2015 Rev.003
5 Page 
BD8964FVM
Datasheet
4. Switching Regulator Efficiency
Efficiency η may be expressed by the equation shown below:
VOUT
VIN
IOUT
I IN
100
POUT
PIN
100
POUT
POUT Pd
100
%
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)
Pd Gate 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)
Pd SW
VIN 2
CRSS I OUT
I DRIVE
f
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)
Pd IC VIN I CC
Where:
ICC is the circuit current
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
11/21
TSZ02201-0J3J0AJ00050-1-2
22.Jan.2015 Rev.003
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet BD8964FVM.PDF ] | |
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