LT8601
42V Triple Monolithic
Synchronous Step-Down Regulator
FEATURES
DESCRIPTION
The LT®8601 is a triple channel, current mode, monolithic
buck switching regulator with a programmable power-on
reset. All regulators are synchronized to a single oscillator
with an adjustable frequency from 250kHz to 2.2MHz. The
LT8601 can be configured for micropower Burst Mode or
pulse-skipping operation at light load. Micropower opera-
tion results in quiescent current of 30µA with all three
regulators operating as shown in the application below
with no load applied.
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Flexible Power Supply System Providing Three
Outputs Over a Wide Input Voltage Range
Two High Voltage Synchronous Buck Regulators
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3V to 42V Input Voltage Range
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Output Currents Up to 2.5A and 1.5A
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High Efficiency Up to 93%
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One Low Voltage Synchronous Buck Regulator
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2.6V to 5.5V Input Voltage Range
Output Current Up to 1.8A and 95% Efficiency
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Resistor Programmable and Synchronizable
from 250kHz to 2.2MHz Switching Frequency
The high voltage channels are synchronous buck regula-
tors that operate from an input of 3.0V to 42V. The output
currents are up to 1.5A (OUT1) and 2.5A (OUT2). The
low voltage channel operates from an input of 2.6V to
5.5V. Internal synchronous power switches provide high
efficiency with output currents up to 1.8A. The LT8601
uses a 2-phase clock with channel 1 operating 180° from
channels 2 and 3 to reduce input ripple current on both
HV and LV inputs. All channels have cycle-by-cycle cur-
rent limit, providing protection against shorted outputs.
Thermal shutdown provides additional protection.
Low Ripple Burst Mode® Operation
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30µA I at 12V to 3.3V
Q
IN
OUT2
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Output Ripple < 15mV
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Programmable Power-On Reset
Power Good Indicators
2-Phase Clock Reduces Input Current Ripple
Available in Thermally Enhanced 40-Lead QFN
(6mm × 6mm) Package
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AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
The LT8601 is available in a 40-lead 6mm × 6mm QFN
package.
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Automotive Systems
All registered trademarks and trademarks are the property of their respective owners.
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Distributed Supply Regulation
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Industrial Controls and Power Supplies
TYPICAL APPLICATION
Automotive Input Stepped Down to 5V, 3.3V and 1.8V Outputs at 2MHz
IN
6V TO 24V,
TRANSIENTS
TO 42V
V
BST1
IN
3.3μH
LT8601
HV Channel Efficiency, VOUT1 = 5V
LV Channel Efficiency, VOUT3 = 1.8V
PV
PV
IN1
IN2
OUT1
5V, 1.5A
SW1
FB1
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EN/UVLO
POREN
22μF
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ꢃ ꢄꢅꢀ
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RST
3
BST2
ꢀ
ꢁꢂ
PG1-3
RUN3
BIAS
1μH
OUT2
3.3V, 1A*
SW2
FB2
OUT2
PV
IN3
47μF
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INTV
CC
CPOR
1μH
OUT3
1.8V, 1.8A
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SW3
FB3
2
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TRKSS1, 2
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RT
22μF
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SYNC
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ꢀꢁꢂꢃ ꢄꢅRRꢆꢇꢈ ꢉꢂꢊ
GND
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ꢀꢁꢂꢃ ꢄꢅꢂꢃꢆ
8601 TA01a
*I
= 2.5A – I
– I
MAX
PVIN3 BIAS
Rev. B
1
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