AMS2596 Datasheet, PDF (1/15 Pages) Advanced Monolithic Systems Ltd – 3.3V, 5V, 12Vand adjustable versions

General Description
The AMS2596 is a high efficiency, non-synchronous
step down regulator delivering up to 3A of output
current making it ideal for medium to heavy load
applications. It is designed to operate with wide
input voltage range of 4.5 to 30V while maintaining
1mA of supply current at no load. The output
voltage is either factor programmed or set via two
external resistors to as low as 1.23V.
The regulator operates at fixed 150kHz switching
frequency ensuring low output ripple across the
entire load. It requires only four external
components for minimum PCB footprint and lowest
overall system cost. An independent Enable pin
provides electrical On/Off of the regulator. When
connected to logic high, the regulator shuts down
and consumes less than 100µA of current. Excellent
transient response is achieved with no external
compensation components.
The device provides under-voltage lockout, output
short circuit and over-temperature protection to
safeguard the device and under fault conditions. An
integrated soft-start controls the ramp of the output
voltage and minimizes the inrush current.
The AMS2596 is available in SOIC, TO220, TO252
and TO263 packages, and it is rated for -25 to
+125°C temperature range.
AMS2596
3A 30V Step-Down Converter
Features
• V_IN range: 4.5 - 30V
• V_OUT range: 1.25V to 7V fixed output Voltage
in 100mV steps
• Adjustable version output voltage range
from 1.2V to 25V
• Up to 5A output current
• 150kHz switching frequency
• 900µA supply current
• 80uA standby quiescent current
• 100% Duty Cycle
• Excellent line and load regulation
• Internal Soft Start
• Internal compensation
• Under voltage lockout
• Current Limit Protection
• Over temperature protection
• -25°C to +125°C Temperature Range
• Available in SOIC-8, TO220-5, TO252-5 and
TO263-5 packages
Applications
• LCD Monitor and TV
• High Current Point of Load Regulator
• System Power
• Set Top Box
Typical Application
12V
C1
470uF
U1
4 _Vin
LX ⁶
2 _EN
LX ⁵
3 _n/c
FB ¹
7 _{gnd gnd} 8
AMS2596
R2
10.0k
L1
33uH
D1
B540C
R1
31.7k
2.5V
C2
470uF
3/4/2010
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