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PDF BD95835EFJ Data sheet ( Hoja de datos )

Número de pieza BD95835EFJ
Descripción 3A 1ch Synchronous Buck Converter
Fabricantes ROHM Semiconductor 
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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 Range:
0.9V to VIN x 0.7
Using switching frequency 200kHz Freq 600kHz
Output Voltage Range:
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 structureSilicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed protection against radioactive rays.
1/20
TSZ02201-0333AAC00210-1-2
29.May.2013 Rev.004

1 page




BD95835EFJ pdf
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.
TSZ2211115001
5/20
TSZ02201-0333AAC00210-1-2
29.May.2013 Rev.004

5 Page





BD95835EFJ arduino
BD95835EFJ
Datasheet
6. Soft start time
Soft start delay TdSoft star time Tss determines as follows:
Td = Css×Vth / Iss [sec]
Tss = Css×VREF / Iss [sec]
CssSS pin external capacitor
VthInternal MOS Vth typ 0.7V
VREFreference voltage typ. 0.75V
IssSS 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 resistanceRss = 5kΩ typ
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/20
TSZ02201-0333AAC00210-1-2
29.May.2013 Rev.004

11 Page







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