CASC
MT3520B
2A,2.3V-6V Input,1.5MHz
Synchronous Step-Down Converter
MT3520B Rev1.0
www.aerosemi.com
Aerosemi Proprietary Information.Unauthorized Photocopy and Duplication Prohibited.
All Rights Reserved.
1
AEROSEMI
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Frequency Operation
2A Output Current
No Schottky Diode Required
2.3V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
PFM Mode for High Efficiency in Light Load
100% Duty Cycle in Dropout Operation
Low Quiescent Current: 40μA
Short Circuit Protection
Thermal Fault Protection
Inrush Current Limit and Soft Start
<1μA Shutdown Current
SOT23-5 package
APPLICATIONS
Cellular and Smart Phones
Wireless and DSL Modems
PDAs
Portable Instruments
Digital Still and Video Cameras
PC Cards
GENERAL DESCRIPTION
The MT3520B is a 1.5MHz constant frequency,
current mode step-down converter. It is ideal for
portable equipment requiring very high current up
to 2A from single-cell Lithium-ion batteries while
still achieving over 90% efficiency during peak
load conditions. The MT3520B also can run at 100%
duty cycle for low dropout operation, extending
battery life in portable systems while light load
operation provides very low output ripple for noise
sensitive applications. The MT3520B can supply
up to 2A output load current from a 2.3V to 6V
input voltage and the output voltage can be
regulated as low as 0.6V. The high switching
frequency minimizes the size of external
components while keeping switching losses low.
The internal slope compensation setting allows the
device to operate with smaller inductor values to
optimize size and provide efficient operation. The
MT3520B is offered in a low profile 6-pin, SOT
package, and is available in an adjustable version.
This device offers two operation modes, PWM
control and PFM Mode switching control, which
allows a high efficiency over the wider range of the
load.
TYPICAL APPLICATION
Figure 1. Basic Application Circuit
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