LT3120
26V, 9A Low-I CC/CV
Q
Monolithic Buck-Boost Converter
FEATURES
DESCRIPTION
The LT®3120 is a high efficiency 26V monolithic buck-
boost converter. Extensive feature integration and very
low resistance internal power switches minimize the total
solution footprint for even the most demanding applica-
tions. A proprietary 4-switch PWM architecture provides
seamless low noise operation from input voltages above,
equal to, or below the output voltage.
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Input Voltage Range: 2.5V to 26V
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0.8V to 24V Output Voltage Range
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High Output Current
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6.5A with V
= 5V, V > 6V
OUT
IN
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3A with V
= 5V, V = 3V
OUT
OUT
IN
6.5A with V
= 12V, V > 14V
IN
4 A with V
= 12V, V = 9V
OUT
IN
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Ultralow Noise Buck-Boost Architecture
Programmable Output Current Limit
External frequency programming as well as synchroniza-
tion using an internal PLL enable operation over a wide
switching frequency range of 400kHz to 2MHz. The wide
2.5V to 26V input range is well suited for operation from
unregulated power sources including battery stacks and
backup capacitors. After start-up, operation is possible
with input voltages as low as 500mV.
Programmable Frequency Range: 400kHz to 2MHz
Accurate Enable Comparator Threshold
Burst Mode® Operation, No-Load I = 35µA
Q
Current Mode Control
External Clock Synchronization
Maximum Power Point Control
28-Lead 4mm × 5mm LQFN Package
Other features include, output short-circuit protection,
thermal overload protection, less than 3µA shutdown cur-
rent, power good indicator, Burst Mode operation, and
maximum power point control.
APPLICATIONS
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RF Power Supply
The LT3120 is offered in thermally enhanced 28-lead
4mm × 5mm LQFN package.
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USB Power Delivery
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System Backup Power Supply
1-Cell to 5-Cell Lithium Battery Powered Products
Wide Input Range Power Supply
Lead Acid to 12V Regulator
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All registered trademarks and trademarks are the property of their respective owners.
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TYPICAL APPLICATION
Wide Input Range 750kHz 5V Regulator
Efficiency, VOUT = 5V, fSW = 750kHz
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