ELM9427B-S Datasheet, PDF (1/6 Pages) ELM Technology Corporation – CMOS PFM step-up DC/DC converter

ELM94xxB CMOS PFM step-up DC/DC converter
■General description
ELM94xxB 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, ELM94 series is able to
acquire constant output voltage higher than input voltage. The standard output voltages are 2.7V, 3.0V, 3.3V, and
5.0V; ELM94 series can also be designed as semi-custom IC within the range of 2.5V to 5.5V by 0.1V step.
■Features
• Output voltage range
: 2.5V to 5.5V (by 0.1V)
• Low voltage operation
: Vin≥0.98V (RL=30kΩ)
• Low power operation
: 12μW (Typ. ELM9430B)
• High efficiency
: Typ. 80%
• High output voltage accuracy : ±2.5%
• Output current(e.g.)
: 20mA (When Vin=1.5V, Vout=3.0V)
• Package
: SOT-89
■Application
• Constant voltage source for battery-
operated devices
• Constant voltage source for cameras
• Portable communication equipments
• Local regulator
■Maximum absolute ratings
Parameter
Symbol
Limit
Unit
Apply voltage to LX pin
Vlx
12
V
Apply voltage to VOUT pin
Vout
12
V
Output current of LX pin
Ilx
200
mA
Power dissipation
Pd
300
mW
Operating temperature
Top
-40 to +85
°C
Storage temperature
Tstg
-55 to +125
°C
■Selection guide
ELM94xxB-x
Symbol
a, b
Output voltage
c
Product version
d
Taping direction
e.g. :
27: Vout=2.7V 30: Vout=3.0V
33: Vout=3.3V 50: Vout=5.0V
B
S : Refer to PKG file
N : Refer to PKG file
ELM94 x x B - x
↑↑↑ ↑
abc d
■Pin configuration
SOT-89 (TOP VIEW)
Pin No.
1
2
3
Pin name
VSS
VOUT
LX
6-1