1.4MHz
ELM620BA
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
■Application
• Cellular phone
• Digital camera
• MP3 player
• Output voltage drop protection
• Thermal shutdown protection and short circuit protection
• Input voltage
: 0.6V to 5.0V
: 2.5V to 6.0V
: Typ.300µA
: < 1µA
• Portable machine
• Wireless handset
• Output voltage
• Low current consumption
• Shutdown current
• Low start-up voltage
: Typ.0.9V
• Low switch on (internal switch) resistance : 0.35Ω
• Constant frequency
• High efficiency
• Package
: Typ.1.4MHz
: 96%
: SOT-26
■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
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
Unit
V
V
V
V
Vin
Vsw
Vfb
Ven
Vout
Pd
V
250
-30 to +85
-65 to 125
mW
°C
°C
Top
Tstg
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
■Selection guide
ELM620BA-S
Symbol
ELM620BA - S
a
b
c
Package
Product version
Taping direction
B: SOT-26
A
S: Refer to PKG file
↑ ↑ ↑
a b c
Taping direction is one way.
*
Rev.1.0
10 - 1