1A 1.5MHz
ELM600xB
high efficiency synchronous PWM step down DC/DC converter
http://www.elm-tech.com
■General description
ELM600xB is a high efficiency step down DC/DC converter operated with current mode and constant
frequency. The internal switch and synchronous rectifier are integrated for high efficiency. External Schottky
diodes are not required. The supply current is only 100μA during operation and drops to less than 1μA in
shutdown. ELM600xB can supply 1A of load current from 2.5V to 5.5V supply voltage.
The switching frequency is set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. It
can run 100% duty cycle for low dropout application. The output voltage of ELM600xB is adjustable from the
FB pin.
■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
: Typ.1.5MHz
: 1A
• Digital camera
: Max.95%
• Wireless and DSL card
• Microcomputer and DSP power supply
• Portable machine
: Max.1µA(Ven=0V, Vin=5.5V)
: 2.5V to 5.5V
: Typ.110µA(Outgoing stopped)
: 0 to 100% (in dropout)
: DFN6-2x2, TSOT-25
• Package
■Maximum absolute ratings
Parameter
VIN power supply voltage
Apply voltage to SW
Apply voltage to EN
Apply voltage to FB
SW peak current
Symbol
Vin
Vsw
Ven
Vfb
Isw
Limit
-0.3 to +6.0
Unit
V
V
V
V
GND-0.3 to Vin+0.3
GND-0.3 to Vin+0.3
GND-0.3 to Vin+0.3
3.0 (*2)
1000 (DFN6-2x2) (*3)
600 (TSOT-25) (*3)
-40 to +85
A
Power dissipation
Pd
mW
Operating temperature range
Storage temperature range
Caution:
Top
Tstg
°C
°C
-65 to +150
* 1. Permanent damage to the device may occur when ratings above maximum absolute ones are used.
* 2. Output current must not exceed power dissipation specified in maximum absolute ratings.
* 3. Mounted on glass epoxy board (FR-4). (76.2mm×114.3mm×1.6mm : based on EIJ/JEDEC standard size), 2layers,
Cu thickness 35μm, Cu area : top side 20%, back side 100%.
Rev.1.0
7 - 1
ELM-TECH [ ELM Technology Corporation ]
