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Número de pieza | BD95835EFJ | |
Descripción | 3A 1ch Synchronous Buck Converter | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
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No Preview Available ! Datasheet
4.5V to 18V, 3A 1ch
Synchronous Buck Converter
BD95835EFJ
●Description
BD95835EFJ is a 1ch synchronous buck converter that
can generate a wide range of output voltage at the input
voltage range (4.5V to 18V). Space-saving and high
efficient switching regulator can be achieved due to
built-in N-MOSFET power transistors. The IC also
incorporates constant ON TIME control mode which
facilitates ultra-high transient response against changes
in load. Variable soft start function, short circuit
protection and over voltage protection are incorporated.
The BD95835EFJ is designed for power supplies for
Digital AV Equipment.
●Applications
・LCD TVs
・Set Top Boxes (STB)
・DVD/Blu-ray players/recorders
・Broadband Network and Communication Interface
・Amusement, other.
●Typical Application
●Features
・Input Voltage Range:
4.5V to 18.0V
・Output Current:
3.0A (Max.)
・Reference Voltage:
0.750V±1.2%
・Output Voltage Range①:
0.9V to VIN x 0.7
Using switching frequency 200kHz ≦Freq ≦ 600kHz
・Output Voltage Range②:
0.9V to VIN x 0.6
Using switching frequency 600kHz <Freq ≦ 800kHz
・Built-in Power MOS FET
High-side Nch FET ON resistance: 100mΩ(typ.)
Low-side Nch FET ON resistance: 100mΩ(typ.)
・Fast Transient Responses due to ON TIME control
・Over Current Protection (OCP)
・Thermal Shut Down (TSD)
・Under-Voltage Lock-Out (UVLO)
・Short Circuit Protection (SCP)
・Over Voltage Protection (OVP)
・Variable Soft Start
●Package
HTSOP-J8
W(Typ.) x D(Typ.) x H(Max.)
4.90mm x 6.00mm x 1.00mm
●Pin Configuration (TOP VIEW)
Thermal Pad
(to be shorted to GND)
BST 1
VIN 2
SW 3
GND 4
(TOP VIEW)
8 SS
7 EN
6 RT
5 FB
Figure 2. Pin Configuration
VIN L VOUT
Figure 1. Typical Application Circuit
○Product structure:Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays.
1/20
TSZ02201-0333AAC00210-1-2
29.May.2013 Rev.004
1 page BD95835EFJ
●Typical Performance Curves (Unless otherwise noted Ta=25℃, VIN=12V, VOUT=3.3V, freq=400kHz)
Datasheet
100
90
80
70
60
50
40
30
20
10
0
0.01
VOUT = 5.0V
VOUT = 3.3V
VOUT = 1.2V
0.1
Iout [A]
1
Figure 4. Efficiency 1
(VIN=12V, L=4.7H, 400kHz)
100
90
80
70
60
50
40
30
20
10
0
10 0.01
600kHz
400kHz
0.1
Iout [A]
1
Figure 5. Efficiency 2
(VIN=12V, VOUT=3.3V, L=4.7H)
10
VOUT
(AC)
20mV/div
SW
5V/div
VOUT
(AC)
20mV/div
SW
5V/div
2sec/div
2sec/div
Figure 6. VOUT Ripple voltage
(VIN=12V, VOUT=3.3V, L=4.7H, COUT=20F, Iout=0A)
Figure 7. VOUT Ripple voltage
(VIN=12V, VOUT=3.3V, L=4.7H, COUT=20F, Iout=3A)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/20
TSZ02201-0333AAC00210-1-2
29.May.2013 Rev.004
5 Page BD95835EFJ
Datasheet
6. Soft start time
Soft start delay Td、Soft star time Tss determines as follows:
Td = Css×Vth / Iss [sec]
Tss = Css×VREF / Iss [sec]
Css:SS pin external capacitor
Vth:Internal MOS Vth typ 0.7V
VREF:reference voltage typ. 0.75V
Iss:SS charge current typ. 10uA
Rush current is determined as follows:
IIN = COUT × VOUT / Tss [A]
EN
SS
REF FB
VOUT
I_VIN
Td Tss
Figure 20. Soft start Timing Chart
When EN=L, UVLO, TSD operates, SS is discharged.
In case of Self-resume type, SS is also discharged after 30us latch off delay detecting OVP or SCP.
(SS discharge resistance:Rss = 5kΩ typ)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/20
TSZ02201-0333AAC00210-1-2
29.May.2013 Rev.004
11 Page |
Páginas | Total 24 Páginas | |
PDF Descargar | [ Datasheet BD95835EFJ.PDF ] |
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