ELM621LA Datasheet, PDF (1/9 Pages) ELM Electronics – High efficiency 30V step up DC/DC converter

ELM621LA High efficiency 30V step up DC/DC converter
■General description
ELM621LA is a high efficiency step-up DC/DC converter using a constant frequency, current mode
architecture. Featuring current-mode and fixed frequency operation, this device incorporates an integrated
main switch and the switching frequency is internally set at 1.3MHz, allowing the use of small surface mount
inductors and capacitor. As for the output voltage, it can be regulated ranging from 2.7V to 30V.
ELM621LA is available in a low profile TSOT-25 package.
■Features
• Current mode operation
• Thermal shutdown protection
• Undervoltage-lockout (UVLO)
• Input voltage range
• Internal current limit
• Shutdown current
• Constant frequency operation
• High efficiency
• Package
: 2.5V to 5.5V
: 1.45A
: < 0.1µA
: Typ.1.3MHz
: 90%
: TSOT-25
■Application
• Cellular telephones
• PDAs and smart phones
• MP3 players
• Wireless and DSL card
• Digital still cameras
• Slim-type DVD
• Portable instruments
■Maximum absolute ratings
Parameter
Symbol
Limit
Unit
VIN power supply voltage
Vin
GND-0.3 to +6.5
V
Apply voltage to EN
Ven
GND-0.3 to +6.5
V
Apply voltage to FB
Vfb
GND-0.3 to +6.5
V
Apply voltage to SW
Vsw
GND-0.3 to +43
V
SW peak current
Isw
2
A
Power dissipation
Pd
200
mW
Operating temperature range
Top
-20 to +85
°C
Storage temperature range
Tstg
-65 to +150
°C
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
■Selection guide
ELM621LA-S
Symbol
a
Package
b
Product version
c
Taping direction
* ^{Taping direction is one way.}
L: TSOT-25
A
S: Refer to PKG file
ELM621LA - S
↑↑ ↑
ab c
9- 1
Rev.1.2