CMOS PWM step-up DC/DC converter
ELM95xxD
■General description
ELM95xxD series is CMOS PWM step-up DC/DC converter which consists of reference voltage source, error
amplifier, oscillation circuit, start-up circuit, PWM control circuit, switch transistor and output voltage setting
resistor. For external parts, coil, diode and capacitor are possible choices; with external parts, ELM95 series
can acquire constant output voltage higher than input voltage. The standard output voltages are 2.7V,3.0V,3.3V
and 5.0V; ELM95 series can also be designed as semi-custom IC within the range of 2.5V to 5.5V by 0.1V step.
With newly-developed PWM control circuit, ELM95 series is able to modulate switching time smoothly with
constant frequency and consequently generates stable output with small ripples.
■Features
■Application
• Output voltage range
• Low voltage operation
• Low power operation
• High efficiency
: 2.5V to 5.5V (by 0.1V)
: Vin≥0.98V (RL=30kΩ)
: 35μW (Typ. ELM9530D)
: Typ. 85%
• Constant voltage source for battery-
operated devices
• Constant voltage source for cameras
• Portable communication equipments
• Local regulator
• High output voltage accuracy : 2.5%
• Output current (e.g.)
: 10mA (When Vin=1.5V, Vout=3.0V)
• Constant output frequency : Typ. 55kHz
• Small ripples
• Package
: SOT-89
■Maximum absolute ratings
Parameter
Apply voltage to LX pin
Apply voltage to VOUT pin
Output current of LX pin
Power dissipation
Symbol
Vlx
Vout
Ilx
Pd
Top
Limit
12
12
200
300
-40 to +85
-55 to +125
Unit
V
V
mA
mW
°C
Operating temperature
Storage temperature
Tstg
°C
■Selection guide
ELM95xxD-x
Symbol
e.g.:
27: Vout=2.7V
30: Vout=3.0V
33: Vout=3.3V
50: Vout=5.0V
D
S : Refer to PKG file
N: Refer to PKG file
ELM95 x x D - x
a, b
Output voltage
↑ ↑ ↑
a b c
↑
d
c
Product version
Taping direction
d
5 - 1