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PDF BD9139MUV Data sheet ( Hoja de datos )
| Número de pieza | BD9139MUV | |
| Descripción | 3A 1ch Synchronous Buck Converter | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
2.7V to 5.5V, 3A 1ch
Synchronous Buck Converter with
Integrated FET
BD9139MUV
General Description
The BD9139MUV is ROHM’s high efficiency
step-down switching regulator designed to produce a
voltage as low as 0.8V from a supply voltage of
5.5V/3.3V. 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:
2.7V to 5.5V
0.8V to 3.3V
3.0A (Max)
1MHz(Typ)
100mΩ(Typ)
80mΩ(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
VQFN016V3030
3.00mm x 3.00mm x 1.00mm
Typical Application Circuit
Rf C1
VCC
CIN
EN
PVCC
VCC
ADJ
CBST
L
ITH GND, PGND SW
RITH
CO
VOUT
CITH
R2
Figure 1. Typical Application Circuit
R1
○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
1/22
TSZ02201-0J3J0AJ00170-1-2
03.Oct.2014 Rev.002
1 page  
BD9139MUV
Typical Performance Curves - continued
【VOUT=3.3】
【VOUT=2.5】
【VOUT=1.08】
【VOUT=1.5】
【VOUT=1.2】
【VOUT=1.0】
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
High Side
Low Side
VCC=3.3V
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
5/22
TSZ02201-0J3J0AJ00170-1-2
03.Oct.2014 Rev.002
5 Page 
BD9139MUV
4. Switching Regulator Efficiency
Efficiency ŋ 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) IOUT2 (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 IOUT f
I DR IV E
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) IRMS2 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 Circuit current.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/22
TSZ02201-0J3J0AJ00170-1-2
03.Oct.2014 Rev.002
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet BD9139MUV.PDF ] | |
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