ELM9527D-S Datasheet, PDF (1/5 Pages) ELM Technology Corporation – CMOS PWM step-up DC/DC converter

ELM95xxD CMOS PWM step-up DC/DC converter
■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
• Output voltage range
: 2.5V to 5.5V (by 0.1V)
• Low voltage operation
: Vin≥0.98V (RL=30kΩ)
• Low power operation
: 35μW (Typ. ELM9530D)
• High efficiency
: Typ. 85%
• 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
■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
ELM95xxD-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
D
S : Refer to PKG file
N : Refer to PKG file
ELM95 x x D - x
↑↑ ↑ ↑
abc d
5- 1