ELM95 Datasheet, PDF (1/15 Pages) ELM Electronics – CMOS PWM step-up DC/DC converter

ELM95xxxxE CMOS PWM step-up DC/DC converter
■General description
ELM95xxxxE is CMOS PWM step-up DC/DC converter which consists of reference voltage source, error
amplifier, oscillation circuit, start-up circuit, PWM control circuit, switching current limit circuit, switch
transistor and output voltage setting resistor. For external parts, coil, diode and capacitor are possible choices;
with external parts, 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.There are two switching frequency and maximum duty ratio available:(Switching frequency, Maximum
duty ratio)=(55kHz, 60%) and (100kHz, 77%).
■Features
• Output voltage range
• Low voltage operation
• Low power operation
• High efficiency
• High output voltage accuracy
• Constant switching frequency
• Output current (e.g.)
• Small ripples
• Package
: 2.5V to 5.5V(by 0.1V step)
: Vin≥0.9V(No load)
: 35µW(ELM9530AxE)
: Typ.85%
: ±2.5%
: Typ.55kHz(Type A), Typ.100kHz(Type B)
: 100mA(Type B, Vin=1.5V, Vout=3.3V)
: Ceramic capacitor can be used for output capacitor.
: SOT-89, SOT-23
■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
Vss-0.3 to 8.0
V
Apply voltage to VOUT pin
Vout
Vss-0.3 to 8.0
V
Output current of LX pin
Ilx
500
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
15 - 1
Rev.1.1