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PDF BD8312HFN Data sheet ( Hoja de datos )
| Número de pieza | BD8312HFN | |
| Descripción | 0.8A 1ch Synchronous Buck Converter Integrated MOSFET | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
3.5V to 14V, 0.8A 1ch Synchronous Buck
Converter Integrated MOSFET
BD8312HFN
General Description
BD8312HFN can produce 1.2V, 1.8V, 3.3V, or 5V
stepped-down output voltages from a power supply
composed of 4 batteries, which can be Li2cell, Li3cell,
or from a 5V/12V fixed power supply line. The built-in
synchronous rectification switches are capable of
withstanding up to15V. This IC has a flexible phase
compensation system and a switching frequency of
1.5MHz allowing the use of smaller external output
inductor and capacitor making the construction of a
compact power supply really easy.
Features
Built-In 1.0A/15V Pch/Nch Synchronous
Rectification SW
On-Chip Phase Compensation Device between
Input and Output of Error AMP.
Built-In Soft-Start Function.
Built-In Timer Latch System for Short Circuit
Protection Function.
Application
For Portable Equipments like DSC/DVC Powered by 4
Dry Batteries or Li2cell and Li3cell, or General
Consumer-Equipment with 5V/12 V Lines
Typical Application Circuit
Input: 4.5V to 10V, output: 3.3V / 500mA
VBAT=4.5V to 10V
Key Specifications
Input Voltage Range:
Output Voltage Range:
Output Current:
Switching Frequency:
Pch FET ON-Resistance:
Nch FET ON-Resistance:
Standby Current:
Operating Temperature Range:
+3.5V to +14V
+1.2V to +12V
0.8A(Max)
1.5MHz(Typ)
450mΩ(Typ)
300mΩ(Typ)
0μA(Typ)
-25°C to +85°C
Package
W (Typ) x D (Typ) x H (Max)
HSON8
2.90mm x 3.00mm x 0.60mm
LX
Figure 1. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
1/21
TSZ02201-0Q3Q0NZ00360-1-2
17.Feb.2015 Rev.002
1 page  
BD8312HFN
Typical Performance Curves
(Unless otherwise specified, Ta = 25°C, VCC = 7.4V）
1.02
1.01
1.00
0.99
0.98
-40 -20
0 20 40 60 80 100 120
Temperature [°C]
Figure 4. INV Threshold vs Temperature
1.02
1.01
1.00
0.99
0.98
0
5
VCC [V]
10
Figure 5. INV Threshold vs Power Supply Voltage
5.3
5.2
5.1
5.0
4.9
4.8
4.7
-40
0 40 80
Temperature [°C]
120
Figure 6. VREG Output vs Temperature
8
7
6
5
4
3
2
1
0
0 2 4 6 8 10 12 14
VCC [V]
Figure 7. VREG Output vs Power Supply Voltage
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/21
TSZ02201-0Q3Q0NZ00360-1-2
17. Feb.2015 Rev.002
5 Page 
BD8312HFN
3. Reference Application Data 2
(Input 4.5V, 6.0V, 8.4V, 10V, Output 3.3V )
60 180
Phase
40 120
20 60
00
Gain
-20 -60
-40 -120
-60
100
1000
10000
Frequency [Hz]
100000
Figure 25. Frequency Response 1
(VCC=4.5V, IO=250mA)
-180
1000000
60 180
Phase
40 120
20 60
00
Gain
-20 -60
-40 -120
-60
100
1000
10000
Frequency [Hz]
100000
Figure 26. Frequency Response 2
(VCC =6.0V, IO=250mA)
-180
1000000
Frequency [Hz]
Figure 27. Frequency Response 3
(VCC=8.4V, IO =250mA)
Frequency [Hz]
Figure 28. Frequency Response 4
(VCC=10V, IO=250mA)
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/21
TSZ02201-0Q3Q0NZ00360-1-2
17. Feb.2015 Rev.002
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet BD8312HFN.PDF ] | |
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