ELM620BA Datasheet, PDF (1/10 Pages) ELM Technology Corporation – 1.4MHz high efficiency synchronous PWM step up DC/DC converter

ELM620BA 1.4MHz
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 .
■Features
• 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
• Cellular phone
• Digital camera
• MP3 player
• Portable machine
• Wireless handset
■Maximum absolute ratings
Parameter
Symbol
Limit
Unit
VIN power supply voltage
Vin
-0.3 to +6.0
V
Apply voltage to SW
Vsw
GND-0.3 to Vout+0.3
V
Apply voltage to FB
Vfb
GND-0.3 to Vout+0.3
V
Apply voltage to EN
Ven
GND-0.3 to Vout+0.3
V
Apply voltage to VOUT
Vout
-0.3 to +6.0
V
Power dissipation
Pd
250
mW
Operating temperature range
Top
-30 to +85
°C
Storage temperature range
Tstg
-65 to 125
°C
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
■Selection guide
ELM620BA-S
Symbol
a
Package
b
Product version
c
Taping direction
* ^{Taping direction is one way.}
B: SOT-26
A
S: Refer to PKG file
ELM620BA - S
↑↑ ↑
ab c
10 - 1
Rev.1.0