high efficiency synchronous PWM step up DC/DC converter
■General
description
ELM620BA is synchronous PWM step-up DC/DC converter with high efficiency and 1.4MHz fixed frequency;
by adopting synchronous switch, ELM620BA is able to provide high efficiency without external Schottky diode.
ELM620BA is able to activate within the range from 0.6V to 5V of input voltage and 2.5V to 6V of output one.
For 3V or 3.3V output, ELM620BA can provide current up to 260mA by a single AA cell, or to 600mA by 2
serial-connected AA cells.
With 1.4MHz switching frequency, small coils and capacitors can be adopted; therefore, ELM620BA is possible
to be assembled within small areas on the board .
ELM620BA
1.4MHz
■Features
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Current mode control
Output voltage drop protection
Thermal shutdown protection and short circuit protection
Input voltage
: 0.6V to 5.0V
Output voltage
: 2.5V to 6.0V
Low current consumption
: Typ.300µA
Shutdown current
: < 1µA
Low start-up voltage
: Typ.0.9V
Low switch on (internal switch) resistance : 0.35Ω
Constant frequency
: Typ.1.4MHz
High efficiency
: 96%
Package
: SOT-26
■Application
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Cellular phone
Digital camera
MP3 player
Portable machine
Wireless handset
■Maximum absolute ratings
Parameter
VIN power supply voltage
Apply voltage to SW
Apply voltage to FB
Apply voltage to EN
Apply voltage to VOUT
Power dissipation
Operating temperature range
Storage temperature range
Symbol
Vin
Vsw
Vfb
Ven
Vout
Pd
Top
Tstg
Limit
-0.3 to +6.0
GND-0.3 to Vout+0.3
GND-0.3 to Vout+0.3
GND-0.3 to Vout+0.3
-0.3 to +6.0
250
-30 to +85
-65 to 125
Unit
V
V
V
V
V
mW
°C
°C
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
■Selection guide
Symbol
a
b
c
ELM620BA-S
Package
Product version
Taping direction
B: SOT-26
A
S: Refer to PKG file
ELM620BA - S
↑↑ ↑
ab c
* Taping direction is one way.
10 - 1
Rev.1.0