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PDF BD89630EFJ Data sheet ( Hoja de datos )
| Número de pieza | BD89630EFJ | |
| Descripción | 2A 1ch Synchronous Buck Converter integrated FET | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
2.7V to 5.5V, 2A 1ch
Synchronous Buck Converter integrated FET
BD89630EFJ
●General Description
ROHM’s high efficiency step-down switching regulator
BD89630EFJ is a power supply designed to produce a
low voltage including 1 volts from 5.5/3.3 volts power
supply line. Offers high efficiency with synchronous
rectifier. Employs a current mode control system to
provide faster transient response to sudden change in
load.
●Features
Offers fast transient response with current mode
PWM control system.
Offers highly efficiency for all load range with
synchronous rectifier (Nch/Pch FET)
Incorporates soft-start function.
Incorporates thermal protection and ULVO
functions.
Incorporates short-current protection circuit with
time delay function.
Incorporates shutdown function
●Applications
Power supply for LSI including DSP, Micro computer
and ASIC
●Key Specification
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
2A(Max.)
1MHz(Typ.)
145mΩ(Typ.)
80mΩ(Typ.)
5μA (Typ.)
-25℃ to +85℃
●Package
HTSOP-J8
(Typ.) (Typ.) (Max.)
4.90mm x 6.00mm x 1.00mm
●Typical Application Circuit
HTSOP-J8
VCC Cin
L
EN VCC SW
VADJ
RCOMP
ADJ
COMP
GND
CO
CCOMP
Fig.1 Typical Application Circuit
VOUT
RFB1
VADJ
RFB2
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･14･001
○This product is not designed protection against radioactive rays.
1/21
TSZ02201-0J3J0AJ00270-1-2
2012.08.28 Rev.001
1 page  
BD89630EFJ
100
【VOUT=1.1V】
90 VCC=5.0V
80 Ta=25℃
70
60
50
40
30
20
10
0
10
100 1000
OUTPUT CURRENT:IOUT[mA]
Fig.8 Efficiency
10000
Datasheet
Fig.9 Ta-FOSC
Fig.10 Ta-RONN, RONP
Fig.11 Ta-VEN
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
5/21
TSZ02201-0J3J0AJ00270-1-2
2012.08.28 Rev.001
5 Page 
BD89630EFJ
Datasheet
●Switching regulator efficiency
Efficiency ŋ may be expressed by the equation shown below:
η= VOUT×IOUT ×100[%]= POUT ×100[%]=
Vin×Iin
Pin
POUT
×100[%]
POUT+PDα
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)
2) Gate charge/discharge dissipation：PD(Gate)
3) Switching dissipation：PD(SW)
4) ESR dissipation of capacitor：PD(ESR)
5) Operating current dissipation of IC：PD(IC)
1)PD(I2R)=IOUT2×(RCOIL+RON) (RCOIL[Ω]：DC resistance of inductor, RON[Ω]：ON resistance of FET, IOUT[A]：Output
current.)
2)PD(Gate)=Cgs×f×V2 (Cgs[F]：Gate capacitance of FET, f[Hz]：Switching frequency, V[V]：Gate driving voltage of FET)
3)PD(SW)= Vin2×CRSS×IOUT×f
IDRIVE
(CRSS[F]：Reverse transfer capacitance of FET, IDRIVE[A]：Peak current of gate.)
4)PD(ESR)=IRMS2×ESR (IRMS[A]：Ripple current of capacitor, ESR[Ω]：Equivalent series resistance.)
5)PD(IC)=Vin×ICC (ICC[A]：Circuit current.)
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
11/21
TSZ02201-0J3J0AJ00270-1-2
2012.08.28 Rev.001
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet BD89630EFJ.PDF ] | |
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