○Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays

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TSZ02201-0Q3Q0NZ00350-1-2

© 2014 ROHM Co., Ltd. All rights reserved.

17.Feb.2015 Rev.002

TSZ22111・14・001

www.rohm.com

3.5V to 11V, Integrated 2.5A MOSFET 1ch

Boost Converter

BD8311NUV

General Description

BD8311NUV is a high-efficiency step-up switching

regulator with built-in power MOSFET that can output

8V or 10V from a 4-battery voltage supply such as

Li2cell or a 5V fixed power supply line. The built-in

80mΩ N-Channel FET switch is capable of handling

output current up to 2.5A. This IC has a flexible phase

compensation system and a switching frequency of

1.2MHz allowing the use of smaller external output

inductor and capacitor making the construction of a

compact power supply really easy.

Features



Built-In 2.5A/14V N-Channel FET Switch



On-Chip Phase Compensation

Between Input and Output of ERROR AMP.



Output Current:



600mA at 10V (3.5V to 10V input)



800mA at 8V (3.5V to 8V input)



Built-In Soft-Start Function.



Built-In Timer Latch System for Short Circuit

Protection Function.

Application

General Portable Equipment like DSC/DVC Powered

by 4 dry Batteries or Li2cell

Key Specification

 Input Voltage Range:

+3.5V to +11.0V

 Output Voltage Range:

+4.0V to +11.0V

 FET Maximum Current:

2.5A

 Switching Frequency:

1.2MHz(Typ)

 Nch FET ON-Resistance:

80m

Ω(Typ)

 Standby Current:

0

μA (Typ)

 Operating Temperature Range:

-25°C to +85°C

Package

W (Typ) x D (Typ) x H (Max)

Typical Application Circuit

Input: 3.5V to 10V, Output: 10V / 500 mA

PGND

STB

INV

SWOUT

PGND

GND

VCC

Lx

Lx

1

3

4

5

2

10

8

7

6

9

ON/OFF

VREG

10V/500mA

10p

200k

10k

100k

22k

22µF

GRM32EB31C226KE16( Murata)

RSX201L-30 (ROHM)

4.7µH

DE3518E( TOKO)

VBAT=2.5~ 4.5V

10µF

GRM31CB31E106KA75L( Murata)

1µF

GRM21BB11C105KA01( Murata)

1µF

GRM188B11A105KA61( Murata)

3.3~ 5.0V

Figure 1. Typical Application Circuit

VSON010V3030

3.00mm x 3.00mm x 1.00mm

３.5V to 10 V

3.5V to 10 V

4.7μH

DE3518E(TOKO)

10μF

GRM31CB31E106KA75L(Murata)

1μF

GRM188B11A105KA61(Murata)

1μF

GRM21BB11C105KA01(Murata)

PGND

STB

INV

SWOUT

PGND

GND

VCC

LX

LX

VREG

22μF

GRM32EB31C226KE16 (Murata)

10V/500mA

RSX201L-30 (ROHM)

ON/OFF

10pF

200k

Ω

10k

Ω

100k

Ω

22k

Ω

Datasheet