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Overview
| Topology | Buck-Boost Converter |
| Input voltage | 3-42 V |
| Switching frequency | 250-2200 kHz |
| Output 1 | 3.3 V |
| Output 2 | 10 V |
| Output 3 | 5 V |
| Output 4 | 1.2 V |
| IC revision | 1 |
Description
The LT®8603 is a highly flexible, quad output regulator combining two high input voltage capable monolithic step-down switching regulators, one low input voltage capable monolithic step-down regulator, and a boost controller to satisfy a wide range of applications while occupying minimal board space. With the boost controller configured to supply the chip VIN supply, the LT8603 produces three precisely regulated outputs even when the boost input voltage falls significantly below the regulated output voltages, such as during an automotive cold crank scenario. Alternatively, with the boost controller driven from one of the step-down regulator outputs or configured as a SEPIC, the LT8603 provides four precisely regulated outputs over a wide input voltage range. The LT8603 provides robust regulation by including a cycle-by-cycle current limit for all step-down regulators, thermal shutdown, and a boost controller that can tolerate reverse battery connections and negative transient input voltages down to –42V.
Features
- Flexible Power Supply System Capable of Four Regulated Outputs with VBATT << VOUT
- Two High Voltage Synchronous Buck Regulators
- 3V to 42V Input Voltage Range
- Output Currents Up to 2.5A and 1.5A
- One Low Voltage Synchronous Buck Regulator
- 2.6V to 5.5V Input Voltage Range
- Output Currents Up to 1.8A
- One Boost Controller Allows Buck Converters to
- Regulate with VBATT << VOUT
- Selectable Burst Mode® Operation Allows Low 28µA IQ with High Voltage Channels Active
- Programmable Power-On Reset
- Individual Channel Power Good Indicators
- Step-Down Switching Frequency: 250kHz to 2.2MHz
- Available in 40-Lead QFN (6mm × 6mm) Package
Typical applications
- Automotive Stop-Start and Cold Crank Ride Through
- Last-Gasp CPU Power Hold-Up
- Industrial Controls and Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Mount | L1(µH) | L2(µH) | n | IR(A) | IR 2(A) | ISAT1(A) | ISAT2(A) | RDC 1(mΩ) | RDC 2(mΩ) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-LHMI SMT Power Inductor, 1 µH, 6.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance1 µH | Performance Rated Current6.2 A | Saturation Current @ 10%6.5 A | Saturation Current @ 30%12.5 A | DC Resistance27 mΩ | Self Resonant Frequency89 MHz | MountSMT | – | – | – | – | – | – | – | – | – | ||||
| WE-LHMI SMT Power Inductor, 1.5 µH, 7.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance1.5 µH | Performance Rated Current7.8 A | Saturation Current @ 10%7.7 A | Saturation Current @ 30%14.2 A | DC Resistance25 mΩ | Self Resonant Frequency45 MHz | MountSMT | – | – | – | – | – | – | – | – | – | ||||
 | WE-CFWI Coupled Flatwire Inductor, 2.2 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CFWI Coupled Flatwire Inductor | Inductance2.2 µH | – | – | – | – | – | – | Inductance 12.2 µH | Inductance 22.2 µH | Turns Ratio1:1 | Rated Current18 A | Rated Current 218 A | Saturation Current 135 A | Saturation Current 235 A | DC Resistance 14.2 mΩ | DC Resistance 24.2 mΩ | ||||
| WE-LHMI SMT Power Inductor, 3.3 µH, 5.45 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance3.3 µH | Performance Rated Current5.45 A | Saturation Current @ 10%5.55 A | Saturation Current @ 30%10.9 A | DC Resistance38 mΩ | Self Resonant Frequency27 MHz | MountSMT | – | – | – | – | – | – | – | – | – |