high efficiency synchronous PWM step-down DC/DC converter
■General
description
ELM601BA is high efficiency synchronous step down DC/DC converter operated with current mode and
2.5MHz constant frequency; internal switch and synchronous rectifier are integrated for high efficiency. In
application, ELM601BA does not require any external Schottky diode. Internal current consumption under
operation of ELM601BA is as low as 300µA and shutdown current is Typ.1μA. With supply voltage from 2.9 V
to 5.5V, ELM601BA can supply load current of 1.5A. The output voltage range of ELM601BA is 1V to 5V, and
can be adjusted by FB pin.
With 2.5MHz switching frequency, ELM601BA 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 to be
lower than output voltage.
ELM601BA
1.5A 2.5MHz
■Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Low output noise across load range
Excellent transient response
Start up into pre-bias output
Internal soft start
Input under-voltage lockout
Over voltage protection
Short circuit protection
Thermal shutdown protection
Input voltage
: 2.9V to 5.5V
Output voltage range (adj.)
: 1V to 5V
Output current
: Max.1.5A
Shutdown current
: Typ.1μA
High efficiency
: 93%
Constant frequency
: Typ.2.5MHz
Duty-cycle low dropout operation : 0 to 100%
Package
: SOT-25
■Application
•
•
•
•
•
•
Bluetooth product
DSC and PMP
GPS device
POL regulator
Portable HDD
Wireless LAN
■Maximum absolute ratings
Parameter
VIN power supply voltage
Apply voltage to SW
Apply voltage to VOUT
Apply voltage to EN
Power dissipation
Operating temperature range
Storage temperature range
Symbol
Vin
Vsw
Vout
Ven
Pd
Top
Tstg
Limit
-0.3 to +6.0
GND-1 to Vin+1 (6V Max.)
GND-1 to Vin-3 (20ns Max.)
-0.3 to +6.0
GND-0.3 to Vin+0.3
200
-40 to +85
-65 to +150
Unit
V
V
V
V
mW
°C
°C
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
7-1
Rev.1.0