ELM600LA Datasheet, PDF (1/10 Pages) ELM Technology Corporation – ELM600LA 800mA 1.4MHz high efficiency synchronous PWM step down DC/DC converter

ELM600LA 800mA 1.4MHz
high efficiency synchronous PWM step down DC/DC converter
■General description
ELM600LA is high efficiency synchronous step down DC/DC converter operated with current mode and 1.4MHz
constant frequency; internal switch and synchronous rectifier are integrated for high efficiency. In application,
ELM600LA does not require any external Schottky diode. Internal current consumption under operation of
ELM600LA is as low as 200µA and drops to less than 1µA in shutdown mode. With supply voltage from 2.5V
to 6V, ELM600LA can supply load current of 800mA; the output voltage can be regulated as low as 0.6V.
With 1.4MHz switching frequency, ELM600LA makes it possible to adopt small surface amount inductors and
capacitors. Switch duty cycle would be on continuously and 100% at maximum when input voltage is set be to
lower than output voltage.
■Features
• Current mode operation
• Thermal shutdown protection and short circuit protection
• Constant frequency
: Typ.1.4MHz
• Output current
: 800mA
• High efficiency
: Max.95%
• Shutdown current
: Max.1µA(Ven=0V, Vin=6V)
• Supply voltage
: 2.5V to 6V
• Low quiescent current
: Typ.200µA
• Full duty ratio
: 0 to 100% (in dropout)
• Package
: TSOT-25
■Application
• Cellular phone
• PDA and smart phone
• MP3 player
• Digital camera
• Wireless and DSL card
• Microcomputer and DSP power supply
• Portable machine
■Maximum absolute ratings
Parameter
Symbol
Limit
Unit
VIN power supply voltage
Vin
-0.3 to +6.5
V
Apply voltage to SW
Vsw
GND-0.3 to Vin+0.3
V
Apply voltage to EN
Ven
GND-0.3 to Vin+0.3
V
Apply voltage to FB
Vfb
GND-0.3 to Vin+0.3
V
SW peak current
Isw
1.7
A
Power dissipation
Pd
200
mW
Operating temperature range
Top
-40 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
ELM600LA-S, ELM600LA-xx-S
Symbol
a
Package
L: TSOT-25
b
Product version A
c, d
Output voltage
e.g. :
12: Vout=1.2V, 18: Vout=1.8V
e
Taping direction S: Refer to PKG file
* ^{Taping direction is one way.}
• Adj. version
ELM600LA - S
↑↑ ↑
ab e
• Fixed version
ELM600 LA - x x - S
↑↑ ↑ ↑ ↑
ab c d e
10 - 1
Rev.1.1