Datasheet LT8602 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 42V Quad Monolithic Synchronous Step-Down Regulator |
| Pages / Page | 30 / 1 — FeaTures. DescripTion. Flexible Power Supply System Providing Four. … |
| File Format / Size | PDF / 1.9 Mb |
| Document Language | English |
FeaTures. DescripTion. Flexible Power Supply System Providing Four. Outputs with a Wide Input Range
Model Line for this Datasheet
LT8602
Text Version of Document
LT8602 42V Quad Monolithic Synchronous Step-Down Regulator
FeaTures DescripTion
n
Flexible Power Supply System Providing Four
The LT®8602 is a quad channel, current mode, monolithic
Outputs with a Wide Input 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
3V to 42V Input Voltage Range
with an adjustable frequency from 250kHz to 2.2MHz. The
Output Currents Up to 2.5A and 1.5A
LT8602 can be configured for micropower Burst Mode
High Efficiency Up to 93%
operation or pulse-skipping operation at light load. Mi- n
Two Low Voltage Synchronous Buck Regulators:
cropower operation results in quiescent current of 30µA
2.6V to 5.5V Input Voltage Range
with all four regulators operating in the application below.
Output Currents Up to 1.8A and 94% Efficiency
The high voltage channels are synchronous buck regula- n
Resistor Programmable and Synchronizable
tors that operate from an input of 3V to 42V. The output
250kHz to 2.2MHz Switching Frequency
currents are up to 1.5A (OUT1) and 2.5A (OUT2). The n
Low Ripple Burst Mode® Operation:
low voltage channels operate from an input of 2.6V to
30µA IQ at 12VIN
5.5V. Internal synchronous power switches provide high
Output Ripple < 15mV
efficiency with output currents up to 1.8A. The LT8602 n
Programmable Power-On Reset
uses a 2-phase clock with channels 1 and 3 operating 180° n Power Good Indicators from channels 2 and 4 to reduce input ripple current on n 2-Phase Clock Reduces Input Current Ripple both HV and LV inputs. All channels have cycle-by-cycle n Available in Thermally Enhanced 40-Lead QFN current limit, providing protection against shorted outputs. (6mm × 6mm) or 48-Lead (7mm × 7mm) LQFP Packages Thermal shutdown provides additional protection.
applicaTions
The LT8602 is available in either a 40-lead 6mm × 6mm QFN or a 48-Lead 7mm n × 7mm LQFP package. Automotive Systems L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Distributed Supply Regulation of Analog Devices, Inc. All other trademarks are the property of their respective owners. n Industrial Controls and Power Supplies
Typical applicaTion 5V, 3.3V, 1.8V and 1.2V Step-Down Regulators
IN VIN BST1 6V TO 42V PV LT8602 IN1 OUT1 PV SW1 IN2 5V, 1.5A FB1
HV Channel Efficiency, LV Channel Efficiency,
EN/UVLO
VIN = 12V, VOUT1 = 5V VOUT3 = 1.8V
POREN BST2 100 2.0 100 1.0 RST OUT2 90 1.8 90 0.9 4 SW2 PG1-4 3.3V* EFFICIENCY EFFICIENCY FB2 80 1.6 80 0.8 2 RUN3-4 70 1.4 POWER LOSS (W) 70 0.7 POWER LOSS (W) BIAS 60 1.2 60 0.6 PV FSW = 1MHz F IN3 SW = 1MHz OUT3 50 1.0 50 0.5 SW3 FSW = 2MHz FSW = 2MHz OUT2 1.8V, 1.7A PVIN4 FB3 40 0.8 40 0.4 EFFICIENCY (%) EFFICIENCY (%) INTVCC 30 0.6 30 0.3 CPOR 20 0.4 20 POWER 0.2 POWER LOSS 2 OUT4 10 0.2 10 0.1 TRKSS1, 2 SW4 LOSS 1.2V, 1.8A FB4 0 0 0 0 RT 0 0.3 0.6 0.9 1.2 1.5 0 0.3 0.6 0.9 1.2 1.5 1.8 SYNC LOAD CURRENT (A) LOAD CURRENT (A) GND 8602 TA01b 8602 TA01c *I 8602 TA01a OUT2 = 2.5A – IPVIN3 – IPVIN4 8602fb For more information www.linear.com/LT8602 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information 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 Four
The LT®8602 is a quad channel, current mode, monolithic
Outputs with a Wide Input 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
3V to 42V Input Voltage Range
with an adjustable frequency from 250kHz to 2.2MHz. The
Output Currents Up to 2.5A and 1.5A
LT8602 can be configured for micropower Burst Mode
High Efficiency Up to 93%
operation or pulse-skipping operation at light load. Mi- n
Two Low Voltage Synchronous Buck Regulators:
cropower operation results in quiescent current of 30µA
2.6V to 5.5V Input Voltage Range
with all four regulators operating in the application below.
Output Currents Up to 1.8A and 94% Efficiency
The high voltage channels are synchronous buck regula- n
Resistor Programmable and Synchronizable
tors that operate from an input of 3V to 42V. The output
250kHz to 2.2MHz Switching Frequency
currents are up to 1.5A (OUT1) and 2.5A (OUT2). The n
Low Ripple Burst Mode® Operation:
low voltage channels operate from an input of 2.6V to
30µA IQ at 12VIN
5.5V. Internal synchronous power switches provide high
Output Ripple < 15mV
efficiency with output currents up to 1.8A. The LT8602 n
Programmable Power-On Reset
uses a 2-phase clock with channels 1 and 3 operating 180° n Power Good Indicators from channels 2 and 4 to reduce input ripple current on n 2-Phase Clock Reduces Input Current Ripple both HV and LV inputs. All channels have cycle-by-cycle n Available in Thermally Enhanced 40-Lead QFN current limit, providing protection against shorted outputs. (6mm × 6mm) or 48-Lead (7mm × 7mm) LQFP Packages Thermal shutdown provides additional protection.
applicaTions
The LT8602 is available in either a 40-lead 6mm × 6mm QFN or a 48-Lead 7mm n × 7mm LQFP package. Automotive Systems L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Distributed Supply Regulation of Analog Devices, Inc. All other trademarks are the property of their respective owners. n Industrial Controls and Power Supplies
Typical applicaTion 5V, 3.3V, 1.8V and 1.2V Step-Down Regulators
IN VIN BST1 6V TO 42V PV LT8602 IN1 OUT1 PV SW1 IN2 5V, 1.5A FB1
HV Channel Efficiency, LV Channel Efficiency,
EN/UVLO
VIN = 12V, VOUT1 = 5V VOUT3 = 1.8V
POREN BST2 100 2.0 100 1.0 RST OUT2 90 1.8 90 0.9 4 SW2 PG1-4 3.3V* EFFICIENCY EFFICIENCY FB2 80 1.6 80 0.8 2 RUN3-4 70 1.4 POWER LOSS (W) 70 0.7 POWER LOSS (W) BIAS 60 1.2 60 0.6 PV FSW = 1MHz F IN3 SW = 1MHz OUT3 50 1.0 50 0.5 SW3 FSW = 2MHz FSW = 2MHz OUT2 1.8V, 1.7A PVIN4 FB3 40 0.8 40 0.4 EFFICIENCY (%) EFFICIENCY (%) INTVCC 30 0.6 30 0.3 CPOR 20 0.4 20 POWER 0.2 POWER LOSS 2 OUT4 10 0.2 10 0.1 TRKSS1, 2 SW4 LOSS 1.2V, 1.8A FB4 0 0 0 0 RT 0 0.3 0.6 0.9 1.2 1.5 0 0.3 0.6 0.9 1.2 1.5 1.8 SYNC LOAD CURRENT (A) LOAD CURRENT (A) GND 8602 TA01b 8602 TA01c *I 8602 TA01a OUT2 = 2.5A – IPVIN3 – IPVIN4 8602fb For more information www.linear.com/LT8602 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
