Datasheet LT8601 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 42V Triple Monolithic Synchronous Step-Down Regulator |
| Pages / Page | 26 / 1 — FeaTures. DescripTion. Flexible Power Supply System Providing Three. … |
| File Format / Size | PDF / 1.6 Mb |
| Document Language | English |
FeaTures. DescripTion. Flexible Power Supply System Providing Three. Outputs Over a Wide Input Voltage Range
Text Version of Document
LT8601 42V Triple Monolithic Synchronous Step-Down Regulator
FeaTures DescripTion
n
Flexible Power Supply System Providing Three
The LT®8601 is a triple channel, current mode, monolithic
Outputs Over a Wide Input Voltage Range
buck switching regulator with a programmable power-on n
Two High Voltage Synchronous Buck Regulators
reset. All regulators are synchronized to a single oscillator n
3V to 42V Input Voltage Range
with an adjustable frequency from 250kHz to 2.2MHz. The n
Output Currents Up to 2.5A and 1.5A
LT8601 can be configured for micropower Burst Mode or n
High Efficiency Up to 93%
pulse-skipping operation at light load. Micropower opera- n
One Low Voltage Synchronous Buck Regulator
tion results in quiescent current of 30µA with all three n
2.6V to 5.5V Input Voltage Range
regulators operating as shown in the application below n
Output Current Up to 1.8A and 95% Efficiency
with no load applied. n
Resistor Programmable and Synchronizable
The high voltage channels are synchronous buck regula-
from 250kHz to 2.2MHz Switching Frequency
tors that operate from an input of 3.0V to 42V. The output n
Low Ripple Burst Mode
®
Operation
currents are up to 1.5A (OUT1) and 2.5A (OUT2). The n
30µA IQ at 12VIN to 3.3VOUT2
low voltage channel operates from an input of 2.6V to n
Output Ripple < 15mV
5.5V. Internal synchronous power switches provide high n
Programmable Power-On Reset
efficiency with output currents up to 1.8A. The LT8601 n Power Good Indicators uses a 2-phase clock with channel 1 operating 180° from n 2-Phase Clock Reduces Input Current Ripple channels 2 and 3 to reduce input ripple current on both n Available in Thermally Enhanced 40-Lead QFN HV and LV inputs. All channels have cycle-by-cycle cur- (6mm × 6mm) Package rent limit, providing protection against shorted outputs. Thermal shutdown provides additional protection.
applicaTions
The LT8601 is available in a 40-lead 6mm × 6mm QFN n Automotive Systems package. n Distributed Supply Regulation n Industrial Controls and Power Supplies L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.
Typical applicaTion Automotive Input Stepped Down to 5V, 3.3V and 1.8V Outputs at 2MHz
IN VIN BST1 6V TO 24V, PV LT8601 3.3μH IN1
HV Channel Efficiency, V
TRANSIENTS OUT1
OUT1 = 5V LV Channel Efficiency, VOUT3 = 1.8V
SW1 TO 42V PVIN2 5V, 1.5A 100 2.0 100 1.0 EN/UVLO FB1 22μF 90 1.8 90 0.9 POREN EFFICIENCY EFFICIENCY RST 80 1.6 80 0.8 3 BST2 PG1-3 70 VIN = 12V 1.4 POWER LOSS (W) 70 0.7 POWER LOSS (W) RUN3 1μH OUT2 SW2 3.3V, 1A* OUT2 60 1.2 60 0.6 BIAS FB2 PVIN3 47μF 50 1.0 50 0.5 INTVCC 40 0.8 40 0.4 EFFICIENCY (%) POWER EFFICIENCY (%) POWER CPOR 30 LOSS 0.6 30 LOSS 0.3 2 1μH OUT3 TRKSS1, 2 SW3 20 0.4 20 0.2 1.8V, 1.8A FB3 f f RT 10 SW = 1MHz 0.2 10 SW = 1MHz 0.1 22μF fSW = 2MHz fSW = 2MHz SYNC 0 0 0 0 GND 0 0.3 0.6 0.9 1.2 1.5 0 0.3 0.6 0.9 1.2 1.5 1.8 8601 TA01a LOAD CURRENT (A) LOAD CURRENT (A) *IMAX = 2.5A – IPVIN3 – IBIAS 8601 TA01b 8601 TA01c 8601fa For more information www.linear.com/LT8601 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FeaTures DescripTion
n
Flexible Power Supply System Providing Three
The LT®8601 is a triple channel, current mode, monolithic
Outputs Over a Wide Input Voltage Range
buck switching regulator with a programmable power-on n
Two High Voltage Synchronous Buck Regulators
reset. All regulators are synchronized to a single oscillator n
3V to 42V Input Voltage Range
with an adjustable frequency from 250kHz to 2.2MHz. The n
Output Currents Up to 2.5A and 1.5A
LT8601 can be configured for micropower Burst Mode or n
High Efficiency Up to 93%
pulse-skipping operation at light load. Micropower opera- n
One Low Voltage Synchronous Buck Regulator
tion results in quiescent current of 30µA with all three n
2.6V to 5.5V Input Voltage Range
regulators operating as shown in the application below n
Output Current Up to 1.8A and 95% Efficiency
with no load applied. n
Resistor Programmable and Synchronizable
The high voltage channels are synchronous buck regula-
from 250kHz to 2.2MHz Switching Frequency
tors that operate from an input of 3.0V to 42V. The output n
Low Ripple Burst Mode
®
Operation
currents are up to 1.5A (OUT1) and 2.5A (OUT2). The n
30µA IQ at 12VIN to 3.3VOUT2
low voltage channel operates from an input of 2.6V to n
Output Ripple < 15mV
5.5V. Internal synchronous power switches provide high n
Programmable Power-On Reset
efficiency with output currents up to 1.8A. The LT8601 n Power Good Indicators uses a 2-phase clock with channel 1 operating 180° from n 2-Phase Clock Reduces Input Current Ripple channels 2 and 3 to reduce input ripple current on both n Available in Thermally Enhanced 40-Lead QFN HV and LV inputs. All channels have cycle-by-cycle cur- (6mm × 6mm) Package rent limit, providing protection against shorted outputs. Thermal shutdown provides additional protection.
applicaTions
The LT8601 is available in a 40-lead 6mm × 6mm QFN n Automotive Systems package. n Distributed Supply Regulation n Industrial Controls and Power Supplies L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.
Typical applicaTion Automotive Input Stepped Down to 5V, 3.3V and 1.8V Outputs at 2MHz
IN VIN BST1 6V TO 24V, PV LT8601 3.3μH IN1
HV Channel Efficiency, V
TRANSIENTS OUT1
OUT1 = 5V LV Channel Efficiency, VOUT3 = 1.8V
SW1 TO 42V PVIN2 5V, 1.5A 100 2.0 100 1.0 EN/UVLO FB1 22μF 90 1.8 90 0.9 POREN EFFICIENCY EFFICIENCY RST 80 1.6 80 0.8 3 BST2 PG1-3 70 VIN = 12V 1.4 POWER LOSS (W) 70 0.7 POWER LOSS (W) RUN3 1μH OUT2 SW2 3.3V, 1A* OUT2 60 1.2 60 0.6 BIAS FB2 PVIN3 47μF 50 1.0 50 0.5 INTVCC 40 0.8 40 0.4 EFFICIENCY (%) POWER EFFICIENCY (%) POWER CPOR 30 LOSS 0.6 30 LOSS 0.3 2 1μH OUT3 TRKSS1, 2 SW3 20 0.4 20 0.2 1.8V, 1.8A FB3 f f RT 10 SW = 1MHz 0.2 10 SW = 1MHz 0.1 22μF fSW = 2MHz fSW = 2MHz SYNC 0 0 0 0 GND 0 0.3 0.6 0.9 1.2 1.5 0 0.3 0.6 0.9 1.2 1.5 1.8 8601 TA01a LOAD CURRENT (A) LOAD CURRENT (A) *IMAX = 2.5A – IPVIN3 – IBIAS 8601 TA01b 8601 TA01c 8601fa For more information www.linear.com/LT8601 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
