NPC SM6702-27HA, SM6702-27HB, SM6702-30HA, SM6702-30HB, SM6702-33HB Datasheet

SM6702 series

NIPPON PRECISION CIRCUITS INC.

PFM Step-up DC/DC Converter

OVERVIEW

The SM6702 series are step-up DC/DC converter ICs, fabricated using NPC’s Molybdenum-gate CMOS pro­cess. They incorporate reference voltage source, error amplifier, oscillator, start-up circuit, PFM (Pulse Fre­quency Modulation) control circuit into a single chip. The only external components required are a Coil, Diode
and output smoothing capacitors to form a step-up DC/DC converter. They employ PFM voltage control cir­cuits to achieve high efficiency, stable constant-voltage output.

FEATURES

■

Power dissipation : 24 µ W at V

■

Start-up input voltage : 0.9 V (max) at R

■

Output voltage : 2.2 V to 3.3 V, available in 0.1 Vstep

■

High efficiency : 85% at V

■

Low ripple voltage

■

Package : SOT23-3, SOT89-3

IN

= 1.5 V, V

IN

= 1.5 V, V

= 30 k Ω

L

OUT

= 3.0 V, I

OUT

= 3.0 V, I

OUT

= 100 µ A

OUT

= 1 mA

APPLICATIONS

PDA, Mobile IT equipment

■

Digital Stil Camera

■

Pager

■

Constant-voltage sources for battery-operated equipment

■

Local voltage sources

■

ORDERING INFORMATION

De vice Output voltage

SM6702-33HB 3.3 V SOT89-3
SM6702-30HA 3.0 V SOT23-3
SM6702-30HB 3.0 V SOT89-3
SM6702-27HA 2.7 V SOT23-3
SM6702-27HB 2.7 V SOT89-3
SM6702-24HA 2.4 V SOT23-3

1. Stepwise setting with a step of 0.1V in the range of 2.2V to 3.3V is available.

1

Package

NIPPON PRECISION CIRCUITS—1

HB

SM6702 series

PINOUT

(Top view)

SM6702 −×× HA(SOT23 − 3) SM6702 −×× HB(SOT89 − 3)

3

20

2

12

1 23

PIN DESCRIPTION

Number

−××

SM6702

HA SM6702

1 1 VS S Ground
2 3 LX Switching pin
3 2 O UT Outpu t (device supply pin)

−××

Name Description

PACKAGE DIMENSIONS

(Unit : mm)

SM6702 −×× HA(SOT23 − 3) SM6702 −×× HB(SOT89 − 3)

2.9 ± 0.2

0 to 15

4.5 ± 0.1

1.55 ± 0.15

1.5 ± 0.1

0.4 ± 0.1

0.95 0.95

0.4 ± 0.1

0.2

1.0

φ

1.6 ± 0.2

2.8 ± 0.2

1.1 ± 0.2

0.8 ± 0.1

M

0.05 ± 0.05

0.2min

0.15

4.0 ± 0.3

0.1

±

1.1 ± 0.2 2.5 ± 0.1 (0.4)

0.42 ± 0.1 0.42 ± 0.1

(8 )

1.5 1.5

(8 )

0.47 ± 0.1

NIPPON PRECISION CIRCUITS—2

(5 )

0.1 ± 0.05

(5 )

0.37 ± 0.1

BLOCK DIAGRAM

OUT

SM6702 series

LX

PFM OSC

VREF

START−UP

VSS

NIPPON PRECISION CIRCUITS—3