Datasheet LT8603 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 42V, Low IQ, Quad Output Triple Monolithic Buck Converter and Boost Controller |
| Pages / Page | 38 / 1 — FEATURES. DESCRIPTION. Flexible Power Supply System Capable of Four. … |
| File Format / Size | PDF / 1.9 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. Flexible Power Supply System Capable of Four. Regulated Outputs with VBATT << VOUT
Text Version of Document
LT8603 42V, Low IQ, Quad Output Triple Monolithic Buck Converter and Boost Controller
FEATURES DESCRIPTION
n
Flexible Power Supply System Capable of Four
The LT®8603 is a highly flexible, quad output regulator
Regulated Outputs with VBATT << VOUT
combining two high input voltage capable monolithic n
Two High Voltage Synchronous Buck Regulators
step-down switching regulators, one low input voltage n
3V to 42V Input Voltage Range
capable monolithic step-down regulator, and a boost n
Output Currents Up to 2.5A and 1.5A
controller to satisfy a wide range of applications while n
One Low Voltage Synchronous Buck Regulator
occupying minimal board space. n
2.6V to 5.5V Input Voltage Range
With the boost controller configured to supply the chip n
Output Currents Up to 1.8A
VIN supply, the LT8603 produces three precisely regulated n
One Boost Controller Allows Buck Converters to
outputs even when the boost input voltage falls signifi-
Regulate with VBATT << VOUT
cantly below the regulated output voltages, such as dur- n
Selectable Burst Mode® Operation Allows Low
ing an automotive cold crank scenario. Alternatively, with
28µA IQ with High Voltage Channels Active
the boost controller driven from one of the step-down n Programmable Power-On Reset regulator outputs or configured as a SEPIC, the LT8603 n Individual Channel Power Good Indicators provides four precisely regulated outputs over a wide n Step-Down Switching Frequency: 250kHz to 2.2MHz input voltage range. n Available in 40-Lead QFN (6mm × 6mm) Package The LT8603 provides robust regulation by including a cycle-by-cycle current limit for all step-down regulators,
APPLICATIONS
thermal shutdown, and a boost controller that can tolerate n Automotive Stop-Start and Cold Crank Ride Through reverse battery connections and negative transient input n Last-Gasp CPU Power Hold-Up voltages down to –42V. n Industrial Controls and Power Supplies All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Cold Crank Tolerant Automotive Triple Output Supply LT8603 Response to a Cold Crank
VBATT OUT4
Automotive Input Waveform
2V TO 42V 8V FOR (BOOST 2V < VBATT < 8.5V START-UP ABOVE 4.3V) EN/UVLO VIN PVIN1 PVIN2 ISP4 ISN4 V INTV GATE4 BATT CC4 VOUT4 INTVCC FB4 FSEL4A FSEL4B BST1 RT SYNC SW1 OUT1 5V, 1.5A VOLTAGE CPOR 2V/DIV 2 LT8603 FB1 TRKSS1-2 VOUT1 BST2 V PV OUT2 IN3 SW2 OUT2 3.3V, RUN3 2.5A – I OUT2 BIAS PVIN3 FB2 VOUT3 4 PG1-4 PG1-4 0V SW3 OUT3 POREN POREN 1.2V, 1.8A RESET RST 8603 TA01b GND FB3 TIME (10ms/DIV) 8603 TA01a 8603f For more information www.linear.com/LT8603 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 System Architecture Boost Controller Buck Regulators General Functions PCB Layout Thermal Considerations Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
Flexible Power Supply System Capable of Four
The LT®8603 is a highly flexible, quad output regulator
Regulated Outputs with VBATT << VOUT
combining two high input voltage capable monolithic n
Two High Voltage Synchronous Buck Regulators
step-down switching regulators, one low input voltage n
3V to 42V Input Voltage Range
capable monolithic step-down regulator, and a boost n
Output Currents Up to 2.5A and 1.5A
controller to satisfy a wide range of applications while n
One Low Voltage Synchronous Buck Regulator
occupying minimal board space. n
2.6V to 5.5V Input Voltage Range
With the boost controller configured to supply the chip n
Output Currents Up to 1.8A
VIN supply, the LT8603 produces three precisely regulated n
One Boost Controller Allows Buck Converters to
outputs even when the boost input voltage falls signifi-
Regulate with VBATT << VOUT
cantly below the regulated output voltages, such as dur- n
Selectable Burst Mode® Operation Allows Low
ing an automotive cold crank scenario. Alternatively, with
28µA IQ with High Voltage Channels Active
the boost controller driven from one of the step-down n Programmable Power-On Reset regulator outputs or configured as a SEPIC, the LT8603 n Individual Channel Power Good Indicators provides four precisely regulated outputs over a wide n Step-Down Switching Frequency: 250kHz to 2.2MHz input voltage range. n Available in 40-Lead QFN (6mm × 6mm) Package The LT8603 provides robust regulation by including a cycle-by-cycle current limit for all step-down regulators,
APPLICATIONS
thermal shutdown, and a boost controller that can tolerate n Automotive Stop-Start and Cold Crank Ride Through reverse battery connections and negative transient input n Last-Gasp CPU Power Hold-Up voltages down to –42V. n Industrial Controls and Power Supplies All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Cold Crank Tolerant Automotive Triple Output Supply LT8603 Response to a Cold Crank
VBATT OUT4
Automotive Input Waveform
2V TO 42V 8V FOR (BOOST 2V < VBATT < 8.5V START-UP ABOVE 4.3V) EN/UVLO VIN PVIN1 PVIN2 ISP4 ISN4 V INTV GATE4 BATT CC4 VOUT4 INTVCC FB4 FSEL4A FSEL4B BST1 RT SYNC SW1 OUT1 5V, 1.5A VOLTAGE CPOR 2V/DIV 2 LT8603 FB1 TRKSS1-2 VOUT1 BST2 V PV OUT2 IN3 SW2 OUT2 3.3V, RUN3 2.5A – I OUT2 BIAS PVIN3 FB2 VOUT3 4 PG1-4 PG1-4 0V SW3 OUT3 POREN POREN 1.2V, 1.8A RESET RST 8603 TA01b GND FB3 TIME (10ms/DIV) 8603 TA01a 8603f For more information www.linear.com/LT8603 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 System Architecture Boost Controller Buck Regulators General Functions PCB Layout Thermal Considerations Typical Applications Package Description Typical Application Related Parts
