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 pro-
cess. They incorporate reference voltage source, error amplifier, oscillator, start-up circuit, PFM (Pulse Fre-
quency 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 cir-
cuits to achieve high efficiency, stable constant-voltage output.
FEATURES
I
I
I
I
I
I
Power dissipation : 24
µ
W at V
IN
= 1.5 V, V
OUT
= 3.0 V, I
OUT
= 100
µ
A
Start-up input voltage : 0.9 V (max) at R
L
= 30 k
Ω
Output voltage : 2.2 V to 3.3 V, available in 0.1 Vstep
High efficiency : 85% at V
IN
= 1.5 V, V
OUT
= 3.0 V, I
OUT
= 1 mA
Low ripple voltage
Package : SOT23-3, SOT89-3
APPLICATIONS
I
I
I
I
I
PDA, Mobile IT equipment
Digital Stil Camera
Pager
Constant-voltage sources for battery-operated equipment
Local voltage sources
ORDERING INFORMATION
D e vice
SM6702-33HB
SM6702-30HA
SM6702-30HB
SM6702-27HA
SM6702-27HB
SM6702-24HA
Output voltag e
1
3.3 V
3.0 V
3.0 V
2.7 V
2.7 V
2.4 V
P ackag e
S O T89-3
S O T23-3
S O T89-3
S O T23-3
S O T89-3
S O T23-3
1. Stepwise setting with a step of 0.1V in the range of 2.2V to 3.3V is available.
NIPPON PRECISION CIRCUITS—1