CMOS High efficiency PFM step-up DC/DC converter
ELM93xxxB
■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
■Application
• Output voltage range
• Low voltage operation
• Low power operation
• High efficiency
: 1.8V to 3.8V (by 0.1V)
: Vin≥0.9V (RL=30kΩ)
: 24μW (Typ. ELM9330xB)
: Typ. 85%
: 2.5%
: 40mA
• Constant voltage source for battery-
operated devices
• Constant voltage source for cameras
• Portable communications equipments
• Local regulator
• High output voltage accuracy
• Output current (e.g.)
(When Vin=1.5V, Vout=3.0V)
: SOT-89, SOT-23
• Package
■Maximum absolute ratings
Parameter
Apply voltage to LX pin
Apply voltage to VOUT pin
Output current of LX pin
Symbol
Vlx
Vout
Ilx
Limit
5
4
Unit
V
V
200
mA
300 (SOT-89)
200 (SOT-23)
-40 to +85
-55 to +125
Power dissipation
Pd
mW
Operating temperature
Storage temperature
Top
Tstg
°C
°C
■Selection guide
ELM93xxxB-x
Symbol
e.g. :
a, b
Output voltage
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
↑ ↑ ↑ ↑ ↑
c
d
e
Package
a b c d e
Product version
Taping direction
8 - 1
ELM-TECH [ ELM Technology Corporation ]
