ELM601BA Datasheet, PDF (1/7 Pages) ELM Technology Corporation – ELM601BA 1.5A 2.5MHz high efficiency synchronous PWM step-down DC/DC converter

ELM601BA 1.5A 2.5MHz
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.
■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
Symbol
Limit
Unit
VIN power supply voltage
Vin
-0.3 to +6.0
V
Apply voltage to SW
Vsw
GND-1 to Vin+1 (6V Max.)
GND-1 to Vin-3 (20ns Max.)
V
Apply voltage to VOUT
Vout
-0.3 to +6.0
V
Apply voltage to EN
Ven
GND-0.3 to Vin+0.3
V
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.
7-1
Rev.1.0