Datasheet LT8708-1 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | 80V Synchronous 4-Switch Buck-Boost DC/DC Slave Controller for LT8708 Multiphase System |
| Pages / Page | 36 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| Revision | A |
| File Format / Size | PDF / 2.0 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Load Step (Page 32) VIN = 12V
Model Line for this Datasheet
Text Version of Document
LT8708-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Load Step (Page 32) VIN = 12V Load Step (Page 32) VIN = 14.5V VOUT = 14.5V VOUT = 14.5V
LT8708 IL LT8708 IL 10A/DIV 10A/DIV LT8708-1 IL LT8708-1 IL 10A/DIV 10A/DIV 500μs/DIV 87081 G10 500μs/DIV 87081 G11 VBAT1 = 12V, VBAT2 REGULATED TO 14.5V VBAT1 = 14.5V, VBAT2 REGULATED TO 14.5V LOAD STEP = 10A TO 25A LOAD STEP = 10A TO 25A LOAD APPLIED AT VBAT2 WITH LOAD APPLIED AT VBAT2 WITH BATTERY DISCONNECTED BATTERY DISCONNECTED
Load Step (Page 32) VIN = 16V Load Step (Page 33) VIN = 48V VOUT = 14.5V VOUT = 14.5V
LT8708 IL PHASE 1 20A/DIV LT8708 IL PHASE 2 10A/DIV LT8708-1 IL 20A/DIV PHASE 3 LT8708-1 IL 20A/DIV PHASE 4 LT8708-1 IL LT8708-1 IL 10A/DIV 20A/DIV 500μs/DIV 87081 G12 500μs/DIV 87081 G13 VBAT1 = 16V, VBAT2 REGULATED TO 14.5V VBAT1 = 48V, VBAT2 REGULATED TO 14.5V LOAD STEP = 10A TO 25A LOAD STEP = 20A TO 55A LOAD APPLIED AT VBAT2 WITH LOAD APPLIED AT VBAT2 WITH BATTERY DISCONNECTED BATTERY DISCONNECTED Rev 0 For more information www.analog.com 9 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 Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Common LT8708-1 and LT8708 Features Adding Phases to an LT8708 Application Adding Phases: The Master LT8708 Adding Phases: The Slave LT8708-1 Start-Up Start-Up: SWEN Pin Start-Up: Soft-Start of Switching Regulator Control Overview Power Switch Control Unidirectional and Bidirectional Conduction Error Amplifiers Transfer Function: IOUT(SLAVE) Vs IOUT(MASTER) Transfer Function: CCM Transfer Function: DCM, HCM and Burst Mode Operation Current Monitoring and Limiting Monitoring: IOUT(SLAVE) Monitoring and Limiting: IIN(SLAVE) Multiphase Clocking Applications Information Quick-Start Multiphase Setup Quick Setup: Design the Master Phase Quick Setup: Design the Slave Phase(s) Quick Setup: Evaluation Choosing the Total Number of Phases Operating Frequency Selection CIN and COUT Selection CIN and COUT Selection: VIN Capacitance CIN and COUT Selection: VOUT Capacitance VINHIMON, VOUTLOMON and RVSOFF Configuring the IIN(SLAVE) Current Limits Regulating IOUT(SLAVE) IOUT(SLAVE): Circuit Description IOUT(SLAVE): Configuration Loop Compensation Voltage Lockouts Circuit Board Layout Checklist Design Example Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Load Step (Page 32) VIN = 12V Load Step (Page 32) VIN = 14.5V VOUT = 14.5V VOUT = 14.5V
LT8708 IL LT8708 IL 10A/DIV 10A/DIV LT8708-1 IL LT8708-1 IL 10A/DIV 10A/DIV 500μs/DIV 87081 G10 500μs/DIV 87081 G11 VBAT1 = 12V, VBAT2 REGULATED TO 14.5V VBAT1 = 14.5V, VBAT2 REGULATED TO 14.5V LOAD STEP = 10A TO 25A LOAD STEP = 10A TO 25A LOAD APPLIED AT VBAT2 WITH LOAD APPLIED AT VBAT2 WITH BATTERY DISCONNECTED BATTERY DISCONNECTED
Load Step (Page 32) VIN = 16V Load Step (Page 33) VIN = 48V VOUT = 14.5V VOUT = 14.5V
LT8708 IL PHASE 1 20A/DIV LT8708 IL PHASE 2 10A/DIV LT8708-1 IL 20A/DIV PHASE 3 LT8708-1 IL 20A/DIV PHASE 4 LT8708-1 IL LT8708-1 IL 10A/DIV 20A/DIV 500μs/DIV 87081 G12 500μs/DIV 87081 G13 VBAT1 = 16V, VBAT2 REGULATED TO 14.5V VBAT1 = 48V, VBAT2 REGULATED TO 14.5V LOAD STEP = 10A TO 25A LOAD STEP = 20A TO 55A LOAD APPLIED AT VBAT2 WITH LOAD APPLIED AT VBAT2 WITH BATTERY DISCONNECTED BATTERY DISCONNECTED Rev 0 For more information www.analog.com 9 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 Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Common LT8708-1 and LT8708 Features Adding Phases to an LT8708 Application Adding Phases: The Master LT8708 Adding Phases: The Slave LT8708-1 Start-Up Start-Up: SWEN Pin Start-Up: Soft-Start of Switching Regulator Control Overview Power Switch Control Unidirectional and Bidirectional Conduction Error Amplifiers Transfer Function: IOUT(SLAVE) Vs IOUT(MASTER) Transfer Function: CCM Transfer Function: DCM, HCM and Burst Mode Operation Current Monitoring and Limiting Monitoring: IOUT(SLAVE) Monitoring and Limiting: IIN(SLAVE) Multiphase Clocking Applications Information Quick-Start Multiphase Setup Quick Setup: Design the Master Phase Quick Setup: Design the Slave Phase(s) Quick Setup: Evaluation Choosing the Total Number of Phases Operating Frequency Selection CIN and COUT Selection CIN and COUT Selection: VIN Capacitance CIN and COUT Selection: VOUT Capacitance VINHIMON, VOUTLOMON and RVSOFF Configuring the IIN(SLAVE) Current Limits Regulating IOUT(SLAVE) IOUT(SLAVE): Circuit Description IOUT(SLAVE): Configuration Loop Compensation Voltage Lockouts Circuit Board Layout Checklist Design Example Typical Applications Package Description Typical Application Related Parts
