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PDF BD9134MUV Data sheet ( Hoja de datos )
| Número de pieza | BD9134MUV | |
| Descripción | 3.0A 1ch Synchronous Buck Converter | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
4.5V to 5.5V, 3.0A 1ch
Synchronous Buck Converter with
Integrated FET
BD9134MUV
General Description
BD9134MUV is ROHM’s high efficiency step-down
switching regulator designed to provide a voltage as
low as 3.3V from a supply voltage of 5V. It offers high
efficiency by using pulse skip control technology and
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 because of
Synchronous Switches (Nch/Nch FET) and SLLMTM
(Simple Light Load Mode)
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:
High side FET ON-Resistance:
Low side FET ON-Resistance:
Standby Current:
Operating Temperature Range:
4.5V to 5.5V
3.25V to 3.35V
3.0A(Max)
1MHz(Typ)
82mΩ(Typ)
70mΩ(Typ)
0μA (Typ)
-40°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
VQFN020V4040
4.00mm x 4.00mm x 1.00mm
Rf C1
VCC
CIN
EN
PVCC
VCC
VOUT
CBST
L
ITH GND, PGND SW
RITH
CO
CITH
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
TSZ02201-0J3J0AJ00150-1-2
03.Oct.2014 Rev.002
1 page  
BD9134MUV
Typical Performance Curves – continued
VOUT=3.3V
VCC=5V
Ta=25°C
Output Current: IOUT[mA]
Figure 8. Efficiency vs Output Current
VCC=5V
Temperature: Ta[°C]
Figure 9. Frequency vs Temperature
VCC=5V
Temperature: Ta[°C]
Figure 10. ON-Resistance 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
TSZ02201-0J3J0AJ00150-1-2
03.Oct.2014 Rev.002
5 Page 
BD9134MUV
4. Switching Regulator Efficiency
Efficiency η may be expressed by the equation shown below:
VOUT IOUT 100 POUT 100 POUT 100
VIN LIN
PIN POUT Pd
%
Efficiency may be improved by reducing the switching regulator power dissipation factors Pda 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:
F is the reverse transfer capacitance of FET.
V is the peak current of gate.
(4) ESR Dissipation of Capacitor：Pd(ESR)
PdESR 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
TSZ02201-0J3J0AJ00150-1-2
03.Oct.2014 Rev.002
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet BD9134MUV.PDF ] | |
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