DC/DC Converter

Boost Type and Buck Type DC/DC converters are provided. Selection of output voltage, output current, switch frequency and PWM/PFM is available. Minimum input voltage is allowed 0.9V. And output voltage option is selectable 1.8V to 5.5V by 0.1V step.

PFM Step up

Part number	Feature	Starting voltage	Output voltage	Efficiency	Oscillating frequency	Package	Datasheet
ELM91series	PFM Step up DC/DC converter DC/DC controller	0.9V	1.8 to 5.5V	Typ 85%	Typ 100kHz	SOT-23 SOT-89 SC-70 (SOT-323)
ELM94series	PFM Step up	0.98V	2.5 to 5.5V	Typ 80%	Typ 35kHz	SOT-89
ELM93series	High efficiency PFM Step up	0.9V	1.8 to 3.8V	Typ 85%	Typ 100kHz	SOT-23 SOT-89

PWM Step up

Part number	Feature	Starting voltage	Output voltage	Efficiency	Oscillating frequency	Package	Datasheet
ELM95series	PWM Step up	0.98V	2.5 to 5.5V	Typ 85%	Typ 55kHz	SOT-89
ELM92series	CE High output current PWM Step up	0.9V	2.5 to 5.5V	Typ 85%	Typ 600kHz	SOT-89 SOT-89-5
ELM620BA	high efficiency synchronous PWM Step up DC/DC converter	0.9V	2.5 to 6.0V	Max.96%	Typ.1.4MHz	SOT-26

PWM Step down

Part number	Feature	Supply voltage range	Output voltage	Efficiency	Oscillating frequency	Package	Datasheet
ELM600LA	high efficiency synchronous PWM Step down DC/DC converter	2.5 to 6.0V	0.6 to 6.0V	Max.95%	Typ 1.4MHz	TSOT-25
ELM601BA	high efficiency synchronous PWM Step down DC/DC converter	2.9 to 5.5V	1.0 to 5.0V	Max.93%	Typ 2.5MHz	SOT-25
ELM610DA	PWM Step down DC/DC converter	5.5 to 36.0V	0.8V to Vin	Typ.87%	Typ.150kHz	SOP-8
ELM611DA	high efficiency synchronous PWM Step down DC/DC converter	4.75 to 23.0V	0.923 to 18.0V	Max.93%	Typ 350kHz	SOP-8