|
|
PDF BD8967FVM Data sheet ( Hoja de datos )
| Número de pieza | BD8967FVM | |
| Descripción | 0.8A 1ch Synchronous Buck Converter | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de BD8967FVM (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
Datasheet
4.5V to 5.5V, 0.8A 1ch
Synchronous Buck Converter with
Integrated FET
BD8967FVM
General Description
BD8967FVM 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 with 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:
4.5V to 5.5V
3.3V±2%
0.8A (Max)
1MHz (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
VCC
CIN
VOUT
RITH
CITH
MSOP8
2.90 mm x 4.00 mm x 0.90 mm
EN
VOUT
VCC,PVCC
SW
ITH
GND,PGND
L
CO
VOUT
Figure 1. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･14･001
○ This product has no designed protection against radioactive rays
1/21
TSZ02201-0J3J0AJ00070-1-2
22.Jan.2015 Rev.003
1 page  
BD8967FVM
Typical Performance Curves – continued
Ta=25°C
Datasheet
Output Current: IOUT [mA]
Figure 8. Efficiency vs Output Current
(VCC=EN=5V, VOUT=3.3V)
Temperature: Ta [°C]
Figure 9. Frequency vs Temperature
VCC=5V
VCC=5V
Temperature: Ta [°C]
Figure 10. NMOS ON-Resistance vs
Temperature
Temperature: Ta [°C]
Figure 11. EN Voltage vs Temperature
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
5/21
TSZ02201-0J3J0AJ00070-1-2
22.Jan.2015 Rev.003
5 Page 
BD8967FVM
Datasheet
4. Switching Regulator Efficiency
Efficiency η may be expressed by the equation shown below:
VOUT
VIN
IOUT
IIN
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
TSZ02201-0J3J0AJ00070-1-2
22.Jan.2015 Rev.003
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet BD8967FVM.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| BD8967FVM | 0.8A 1ch Synchronous Buck Converter | ROHM Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |