ELM93-SERIES Datasheet, PDF (1/8 Pages) ELM Technology Corporation – PFM step-up DC/DC converter

ELM93xxxB CMOS High efficiency PFM step-up DC/DC converter
http://www.elm-tech.com
■General description
ELM93xxxB is CMOS step-up DC/DC converter which consists of reference voltage source, error amplifier,
oscillation circuit, start-up circuit, PFM control circuit, switching transistor and output voltage setting resistor.
For external parts, coil, diode and capacitor are possible choices; with external parts, ELM93 series is able to
acquire constant output voltage higher than input voltage. The standard output voltages are 2.7V, 3.0V, and 3.3V;
ELM93 series can also be designed as semi-custom IC within the range of 1.8V to 3.8V by 0.1V step.
■Features
• Output voltage range
: 1.8V to 3.8V (by 0.1V)
• Low voltage operation
: Vin≥0.9V(RL=30kΩ)
• Low power operation
: Typ.24μW(ELM9330xB)
• High efficiency
: Typ.85%
• High output voltage accuracy : ±2.5%
• Output current (e.g.)
: 40mA(Vin=1.5V, Vout=3.0V)
• Package
: SOT-89, SOT-23
■Application
• Constant voltage source for battery-
operated devices
• Constant voltage source for cameras
• Portable communications equipments
• Local regulator
■Maximum absolute ratings
Parameter
Symbol
Limit
Unit
Apply voltage to LX pin
Vlx
5
V
Apply voltage to VOUT pin
Vout
4
V
Output current of LX pin
Ilx
200
mA
Power dissipation
Pd
500 (SOT-89)
250 (SOT-23)
mW
Operating temperature
Top
-40 to +85
°C
Storage temperature
Tstg
-55 to +125
°C
■Selection guide
ELM93xxxB-x
Symbol
a, b
Output voltage
c
Package
d
Product version
e
Taping direction
e.g. :
27: Vout=2.7V
30: Vout=3.0V
33: Vout=3.3V
A: SOT-89
B: SOT-23
B
S: Refer to PKG file
N: Refer to PKG file
ELM93 x x x B - x
↑↑↑ ↑ ↑
abc d e
Rev.1.0
8-1