A7121A
DC-DC CONVERTER BUCK (STEP-DOWN)
1MHz, 2.0A, SYNCHRONOUS
AiT Semiconductor Inc.
www.ait-ic.com
DESCRIPTION
FEATURES
The A7121A is
synchronous buck regulator using
a
high efficiency monolithic
constant
High Efficiency: Up to 97%
1MHz Constant Switching Frequency
2.0A Output Current at VIN=3V
Integrated Main Switch and Synchronous Rectifier
No Schottky Diode Required
2.7V to 6.0V Input Voltage Range
a
frequency, current mode architecture. Supply current
with no load is 60uA and drops to <1uA in shutdown.
The 2.7V to 6.0V input voltage range makes the
A7121A ideally suited for single Li-Ion, two to four AA
battery-powered applications. 100% duty cycle
provides low dropout operation, extending battery life
in portable systems. PWM pulse skipping mode
operation provides very low output ripple voltage for
noise sensitive applications. Switching frequency is
internally set at 1MHz, allowing the use of small
surface mount inductors and capacitors. The internal
synchronous switch increases efficiency and
eliminates the need for an external Schottky diode.
Low output voltages are easily supported with the
0.6V feedback reference voltage.
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Quiescent Current: 60μA(input < 4.2V)
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Robust protection features, OCP, SCP, TSD
Same BOM L-C passive components for VIN=5V
to VOUT = 3.3V, 2.5V, 1.8V, 1.2V, and 1.0V
Shutdown Current <1uA
Internal Soft start Circuitry
Available in SOT-25 and SOT-26 Packages
APPLICATION
The A7121A is available in SOT-25 and SOT-26
packages.
Set Top Box
Portable Instruments
ORDERING INFORMATION
Battery Powered Equipment
Wireless Access Point Router and DSL Modems
Personal and Notebook Computer
Microprocessors and DSP Core Supplies
Digital Still and Video Cameras
Package Type
Part Number
A7121AE5R
A7121AE5VR
A7121AE6R
A7121AE6VR
SOT-25
SPQ: 3,000pcs/Reel
SOT-26
E5
E6
SPQ: 3,000pcs/Reel
TYPICAL APPLICATION
V: Halogen free Package
R: Tape & Reel
Note
AiT provides all RoHS products
Figure 1. Typical Application Circuit
REV1.3
- JUL 2013 RELEASED, NOV 2016 UPDATED -
- 1 -
AITSEMI [ AiT Semiconductor ]
