800mA 1.4MHz
ELM600LA
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
■Application
• Current mode operation
• Cellular phone
• Thermal shutdown protection and short circuit protection
• PDA and smart phone
• MP3 player
• Constant frequency
• Output current
• High efficiency
• Shutdown current
• Supply voltage
• Low quiescent current
• Full duty ratio
• Package
: Typ.1.4MHz
: 800mA
• Digital camera
: Max.95%
• Wireless and DSL card
• Microcomputer and DSP power supply
• Portable machine
: Max.1µA(Ven=0V, Vin=6V)
: 2.5V to 6V
: Typ.200µA
: 0 to 100% (in dropout)
: TSOT-25
■Maximum absolute ratings
Parameter
VIN power supply voltage
Apply voltage to SW
Apply voltage to EN
Apply voltage to FB
Symbol
Vin
Vsw
Ven
Vfb
Isw
Limit
-0.3 to +6.5
GND-0.3 to Vin+0.3
GND-0.3 to Vin+0.3
GND-0.3 to Vin+0.3
1.7
Unit
V
V
V
V
SW peak current
A
Power dissipation
Operating temperature range
Storage temperature range
Pd
Top
Tstg
200
-40 to +85
-65 to +150
mW
°C
°C
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
■Selection guide
• Adj. version
ELM600LA-S, ELM600LA-xx-S
Symbol
ELM600LA - S
↑ ↑ ↑
a
Package
L: TSOT-25
b
Product version
A
a b e
e.g. :
• Fixed version
c, d
e
Output voltage
Taping direction
12: Vout=1.2V, 18: Vout=1.8V
S: Refer to PKG file
ELM600 LA - x x - S
↑ ↑ ↑ ↑ ↑
Taping direction is one way.
*
a b c d e
Rev.1.1
10 - 1