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Número de pieza | BD8963EFJ | |
Descripción | 3A 1ch Synchronous Buck Converter | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
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No Preview Available ! Datasheet
2.7V to 5.5V, 3A 1ch
Synchronous Buck Converter with
Integrated FET
BD8963EFJ
General Description
The BD8963EFJ is ROHM's high efficiency step-down
switching regulator designed to produce a voltage as
low as 1.0V from a supply voltage of 5.5V/3.3V. 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
Soft-Start Function
Thermal Shutdown and UVLO Functions
Short Circuit Current Protection with Time Delay
Function
Shutdown Function
Applications
Power Supply for LSI including DSP, Microcomputer
and ASIC
Key Specifications
Input Voltage Range:
Output Voltage Range:
Average Output Current:
Switching Frequency:
Pch FET ON-Resistance:
Nch FET ON-Resistance:
Standby Current:
Operating Temperature Range:
2.7V to 5.5V
1.0V to 2.5V
3.0A (Max)
1MHz (Typ)
145mΩ(Typ)
80mΩ(Typ)
5.0μA (Typ)
-25°C to +85°C
Package
W(Typ) x D(Typ) x H(Max)
HTSOP-J8
4.90mm x 6.00mm x 1.00mm
Typical Application Circuit
VCC
CIN
VCC
L
EN SW
ADJ
CO
RCOMP
COMP
GND
CCOMP
VOUT
R2
R1
Figure 1. Typical Application Circuit
○Product structure:Silicon monolithic integrated circuit
www.rohm.com
©2012 2012ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○ This product has no designed protection against radioactive rays
1/24
TSZ02201-0J3J0AJ00040-1-2
02.Oct.2014 Rev.003
1 page BD8963EFJ
Typical Performance Curves - continued
VCC=5.0V
Datasheet
[V[VOOUTU=T=11.1.1VV] ]
VVCC=C=55.0.0VV
TTaa==2255°C°C
Output Current: IOUT[mA]
Figure 8. Efficiency vs Output Current
VCC=5.0V
PMOS
NMOS
Temperature: Ta[°C]
Figure 10. ON-Resistance vs Temperature
Temperature: Ta[°C]
Figure 9. Frequency vs Temperature
VCC=5.0V
Temperature: Ta[°C]
Figure 11. EN Voltage vs Temperature
www.rohm.com
©20122012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/24
TSZ02201-0J3J0AJ00040-1-2
02.Oct.2014 Rev.003
5 Page BD8963EFJ
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 2R 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)
PdESR I RMS2 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
©20122012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/24
TSZ02201-0J3J0AJ00040-1-2
02.Oct.2014 Rev.003
11 Page |
Páginas | Total 28 Páginas | |
PDF Descargar | [ Datasheet BD8963EFJ.PDF ] |
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