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PDF BD8646FV Data sheet ( Hoja de datos )
| Número de pieza | BD8646FV | |
| Descripción | Flexible Step-down Switching Regulator | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Single-chip Type with Built-in FET type Switching Regulators
Flexible Step-down
Switching Regulator
with Built-in Power MOSFET
BD8646FV
No.10027EAT44
●Description
The BD8646FV is a synchronous step-down switching regulator that integrates 2 low resistances N-channel MOSFETs.
It achieves 2A continuous output current over a wide input supply range.
Current mode operation provides fast transient response and easy phase compensation.
●Feature
1) Synchronous rectification with built-in FET type DC/DC converter
2) 2.0A output current
3) Range of operation power-supply voltage 4.5V～18V
4) Reference voltage FB 0.8V±1%
5) Programmable frequency 100kHz～600kHz
6) Over current protection function
7) Thermal shutdown function
8) Under voltage protection
9) Soft start time out function / Soft start delay circuit
10) Programmable OFFLATCH time
●Applications
FPD,DVD,HDD Recorder,STB,Amusement,Other
●Absolute maximum rating (Ta=25℃)
Parameter
Symbol
Ratings
Unit
Input supply voltage
VIN 20 V
BOOT terminal voltage
VBOOT
28
V
EN terminal voltage
Input terminal voltage
VEN
VINP*1
GND-0.3 ～ VIN+0.3
GND-0.3 ～ 7
V
V
SW terminal voltage
VSW GND-0.3 ～ VIN+0.3 V
Output current
Power dissipation
IOUT 2.5 A
Pd
1.19*2
W
Operating temperature
Topr -20 ～ 85 ℃
Storage temperature
Tstg -55 ～ 150 ℃
*1 VINP Application terminal: SS/DELAY, FB, FC, RT, PSET
*2 (70mm×70mm, thickness 1.6mm, and four layer glass epoxy substrates)When mounting substrate and the package
back exposure part are connected with solder
Operating at higher than Ta=25℃, 9.5mW shall be reduced per 1
●Operating conditions
Parameter
Symbol
Min.
Input supply voltage
VIN 4.5
Output current
IOUT
-
* This product is not designed for protection against radioactive rays.
Ratings
Typ.
-
-
Max.
18.0
2.0
Unit
V
A
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/13
2010.09 - Rev.A
Free Datasheet http://www.Datasheet4U.com
1 page  
BD8646FV
Technical Note
●Operation description
1 Enable control
The device can be controlled ON/OFF by EN terminal (15 pin) voltage.
An internal circuit starts when VEN reaches 1.4V.
When standing up of VIN is too steep (1msec or less), a defective start might be caused according to the state of Pascon
between GND substrate pattern and power supply-when the terminal EN is short-circuited to the terminal VIN and it is used.
VEN
EN terminal
VENH
VENL
0
SS terminal
VSS
VSSCLM
VSSTH
0
VO
Output setting voltage
0
tSS
Fig.12 ON/OFF transition wave form in EN controlling
2 Soft start time set function
As for BD8646FV, output can do soft start without overshoot by charging soft start capacity (CSS) connected between
SS/DELAY (9 pin) and GND (10 pin) terminal.
Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily.
(Refer to 5-2 soft start time setting method)
3 OSC oscillation frequency setting function
The output oscillation frequency can be set by connecting resistance between terminal RT (13 pin) and GND
(range = 100kHz – 600kHz)
The relation between RT terminal resistance and the oscillation frequency follows Fig.13.
10000
1000
100
10
1
10 100
RT[kΩ]
Fig.13 Oscillation frequency setting by RT resistance
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/13
1000
2010.09 - Rev.A
Free Datasheet http://www.Datasheet4U.com
5 Page 
BD8646FV
●I/O equivalence circuit
4, 5 ,6PIN(SW)
VIN
SW
GND
11PIN(FB)
VIN
FB 50kΩ
14PIN(PSET)
VIN
50kΩ
100kΩ
2kΩ
PSET
GND
GND
GND
7PIN(BOOT)
VREG5
BOOT
SW
12PIN(FC)
VIN
10kΩ
VIN
5kΩ FC
400Ω
10kΩ
SGND SGND
SGND
PGND
15PIN(EN)
VIN
EN
330kΩ
GND
600kΩ
GND GND
Technical Note
9PIN(SS/DELAY)
50kΩ
50kΩ
SS/ DELAY
2kΩ
13PIN(RT)
10kΩ
VIN
1kΩ
2kΩ RT
GND
GND
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/13
2010.09 - Rev.A
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet BD8646FV.PDF ] | |
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