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PDF BD8960NV Data sheet ( Hoja de datos )
| Número de pieza | BD8960NV | |
| Descripción | Low Noise High Efficiency Step-down Switching Regulator | |
| Fabricantes | ROHM Semiconductor | |
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Single-chip Type with Built-in FET Switching Regulators
Low Noise High Efficiency
Step-down Switching Regulator
with Built-in Power MOSFET
BD8960NV
No.10027EBT21
●Description
ROHM’s high efficiency step-down switching regulator BD8960NV 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
1) Offers fast transient response with current mode PWM control system.
2) Offers highly efficiency for all load range with synchronous rectifier (Nch/Pch FET)
3) Incorporates soft-start function.
4) Incorporates thermal protection and ULVO functions.
5) Incorporates short-current protection circuit with time delay function.
6) Incorporates shutdown function
7) Employs small surface mount package : SON008V5060
●Applications
Power supply for LSI including DSP, Micro computer and ASIC
●Line up
Parameter
Symbol
www.DataSheet.co.kr
Limits
Unit
VCC Voltage
PVCC Voltage
VCC
PVCC
-0.3～+7 ＊1
-0.3～+7 ＊1
V
V
EN Voltage
VEN
-0.3～+7
V
SW,ITH Voltage
Power Dissipation 1
Power Dissipation 2
VSW,VITH
Pd1
Pd2
-0.3～+7
900＊2
3900＊3
V
mW
mW
Operating temperature range
Topr
-25 ~ +105
℃
Storage temperature range
Tstg
-5 ~ +150
℃
Maximum junction temperature
Tjmax
+150
℃
＊1 Pd should not be exceeded.
＊2 Derating in done 7.2mW/℃ for temperatures above Ta=25℃, Mounted on 70mm×70mm×1.6mm Glass Epoxy PCB.
＊3 Derating in done 31.2mW/℃ for temperatures above Ta=25℃, Mounted on JESD51-7.
●Operating Conditions (Ta=25℃)
Parameter
VCC Voltage
PVCC Voltage
Symbol
VCC *4
PVCC *4
Min.
2.7 *5
2.7 *5
EN Voltage
SW average output current
VEN
Isw *4
0
-
Output voltage Setting Range
VOUT
1.0
＊4 Pd should not be exceeded.
＊5 In case set output voltage 1.6V or more, VccMin. = Vout + 1.3V.
Limits
Typ.
3.3
3.3
-
-
-
Max.
5.5
5.5
VCC
2.0
2.5
Unit
V
V
V
A
V
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/14
2010.04 - Rev.B
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
BD8960NV
Technical Note
●Information on advantages
Advantage 1：Offers fast transient response with current mode control system.
Conventional product (Load response IO=0.1A→0.6A)
BD8960NV (Load response IO=1A→2A)
VOUT
110mV
VOUT
29mV
IOUT
IOUT
Voltage drop due to sudden change in load was reduced by about 50%.
Fig.17 Comparison of transient response
Advantage 2： Offers high efficiency with synchronous rectifier
Utilizes the synchronous rectifying mode and the low on-resistance MOS FETs
incorporated as power transistor.
ON resistance of P-channel MOS FET : 200mΩ(Typ.)
ON resistance of N-channel MOS FET : 160mΩ(Typ.)
www.DataSheet.co.kr
100
90
80
70
60
50
40
30
20
10
0
10
【VOUT=1.2V】
VCC=3.3V
Ta=25℃
100 1000
OU TPU T C U R R EN T:IOU T[mA]
Fig.18 Efficiency
10000
Advantage 3：・Supplied in smaller package due to small-sized power MOS FET incorporated.
・Output capacitor Co required for current mode control: 22μF ceramic capacitor
・Inductance L required for the operating frequency of 1 MHz: 2.2μH inductor
Reduces a mounting area required.
VCC
DC/DC
Convertor
Controller
RITH
CITH
Cin
L VOUT
Co
15mm
10mm
RITH
CIN
CITH
CO
L
Fig.19 Example application
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/14
2010.04 - Rev.B
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
BD8960NV
Technical Note
5. Determination of output voltage
The output voltage VOUT is determined by the equation (6):
VOUT=(R2/R1+1)×VADJ・・・(6) VADJ: Voltage at ADJ terminal (0.8V Typ.)
With R1 and R2 adjusted, the output voltage may be determined as required.
Adjustable output voltage range : 1.0V～2.5V
6
SW
1
ADJ
L
Co
Output
R2
R1
Fig.31 Determination of output voltage
Use 1 kΩ～100 kΩ resistor for R1. If a resistor of the resistance higher than 100 kΩ is used, check the assembled set
carefully for ripple voltage etc.
3.9
The lower limit of input voltage depends on the output voltage.
Basically, it is recommended to use in the condition :
VCCmin = VOUT+1.3V.
Fig.32. shows the necessary output current value at the lower
limit of input voltage. (DCR of inductor : 0.1Ω)
This data is the characteristic value, so it’ doesn’t guarantee the
operation range,
3.7
3.5
3.3
Vo=2.5V
3.1
Vo=1.8V
Vo=2.0V
2.9
●BD8960NV Cautions on PC Board layout
2.7
0
0.5 1 1.5
OUTPUT CURRENT : IOUT[A]
2
Fig.32 minimum input voltage in each output voltage
www.DataSheet.co.kr
R2
R1
RITH
③
CITH
1 ADJ
2
VCC
3 ITH
4
GND
VCC
EN 8
7
PVCC
6
SW
5
PGND
EN
L
CIN
②
Co
①
VOUT
GND
Fig.33 Layout diagram
①For the sections drawn with heavy line, use thick conductor pattern as short as possible.
②Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to
the pin PGND.
③Lay out CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring.
* SON008V5060 (BD8960NV) has thermal FIN on the reverse of the package.
The package thermal performance may be enhanced by bonding the FIN to GND plane which take a large area of PCB.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/14
2010.04 - Rev.B
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
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