Datasheet LTC3870-1 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | PolyPhase Step-Down Slave Controller for Digital Power System Management |
| Pages / Page | 20 / 1 — FeaTures. DescripTion. LTC3887-1 Phase Extender. Operates with Power … |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
FeaTures. DescripTion. LTC3887-1 Phase Extender. Operates with Power Blocks, DrMOS or External. Gate Drivers and MOSFETs
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LTC3870-1 PolyPhase Step-Down Slave Controller for Digital Power System Management
FeaTures DescripTion
n
LTC3887-1 Phase Extender
The LTC®3870-1 is a PolyPhase® step-down slave control- n
Operates with Power Blocks, DrMOS or External
ler specially designed for multiphase operation with LTC's
Gate Drivers and MOSFETs
digital power system management DC/DC controllers. It n
Cascade with Multiple Chips for Very Large Current
provides a small and cost effective solution for supply-
Applications
ing very large currents by cascading it with a LTC3887-1 n
Accurate PolyPhase Current Sharing
controller. A peak current mode architecture provides the n
EXTVCC Capable of 5V to 14V Input
LTC3870-1 with excellent current sharing from phase to n Wide VIN Range: 4.5V to 60V phase and from chip to chip. n Wide Output Voltage Range : 0.5V to 14V Coherently working with the LTC3887-1, the LTC3870-1 n Wide SYNC Frequency Range: 100kHz to 1MHz does not require additional I2C addresses, and it supports n Pin Programmable CCM/DCM Operation all programmable features as well as fault protection. n Pin Programmable Phase-Shift Control The constant switching frequency can be synchronized n Available in a 24-Pin (4mm × 4mm) QFN Package to an external clock from the LTC3887-1 over a range of 100kHz to 1MHz.
applicaTions
L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, n High Power Distributed Power Systems 6580258, 5408150 n Telecom Systems n Industrial Applications
Typical applicaTion Load Transient Response of a 2-Phase Master (3887-1)/Slave
VIN 7V TO 14V
(3870-1) Converter
22µF 4.7µF VIN INTVCC ILOAD 20A/DIV VCC0 VCC1 10A TO 20A TO 10A LTC3870-1 V I OUT0 V L LTC3887–1 1.0µH 0.56µH OUT1 3.3V, 30A 1.8V, 40A (CH0) DrMOS PWM0 PWM1 DrMOS 10A/DIV 2.15k 1.74k I 530µF 530µF L LTC3870–1 (CH0) 0.2µF 0.2µF 10A/DIV ISENSE0+ ISENSE1+ VOUT 200mV/DIV ISENSE0- ISENSE1- AC–COUPLED 38701 TA01b EXTV LTC3887-1 100µs/DIV CC RUN0 RUN0 VIN = 12V RUN1 RUN1 3.3V 82.5k VOUT = 1.8V VSENSE0+ GPIO0 FAULT0 FREQ GPIO1 FAULT1 PHASMD 1.8V VSENSE1+ ITH0 ITH0 ILIM ITH1 ITH1 MODE0 SYNC SYNC MODE1 GND * REFER TO LTC3887-1 DATA SHEET FOR MASTER SETUP 38701 TA01a 38701f For more information www.linear.com/LTC3870-1 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FeaTures DescripTion
n
LTC3887-1 Phase Extender
The LTC®3870-1 is a PolyPhase® step-down slave control- n
Operates with Power Blocks, DrMOS or External
ler specially designed for multiphase operation with LTC's
Gate Drivers and MOSFETs
digital power system management DC/DC controllers. It n
Cascade with Multiple Chips for Very Large Current
provides a small and cost effective solution for supply-
Applications
ing very large currents by cascading it with a LTC3887-1 n
Accurate PolyPhase Current Sharing
controller. A peak current mode architecture provides the n
EXTVCC Capable of 5V to 14V Input
LTC3870-1 with excellent current sharing from phase to n Wide VIN Range: 4.5V to 60V phase and from chip to chip. n Wide Output Voltage Range : 0.5V to 14V Coherently working with the LTC3887-1, the LTC3870-1 n Wide SYNC Frequency Range: 100kHz to 1MHz does not require additional I2C addresses, and it supports n Pin Programmable CCM/DCM Operation all programmable features as well as fault protection. n Pin Programmable Phase-Shift Control The constant switching frequency can be synchronized n Available in a 24-Pin (4mm × 4mm) QFN Package to an external clock from the LTC3887-1 over a range of 100kHz to 1MHz.
applicaTions
L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, n High Power Distributed Power Systems 6580258, 5408150 n Telecom Systems n Industrial Applications
Typical applicaTion Load Transient Response of a 2-Phase Master (3887-1)/Slave
VIN 7V TO 14V
(3870-1) Converter
22µF 4.7µF VIN INTVCC ILOAD 20A/DIV VCC0 VCC1 10A TO 20A TO 10A LTC3870-1 V I OUT0 V L LTC3887–1 1.0µH 0.56µH OUT1 3.3V, 30A 1.8V, 40A (CH0) DrMOS PWM0 PWM1 DrMOS 10A/DIV 2.15k 1.74k I 530µF 530µF L LTC3870–1 (CH0) 0.2µF 0.2µF 10A/DIV ISENSE0+ ISENSE1+ VOUT 200mV/DIV ISENSE0- ISENSE1- AC–COUPLED 38701 TA01b EXTV LTC3887-1 100µs/DIV CC RUN0 RUN0 VIN = 12V RUN1 RUN1 3.3V 82.5k VOUT = 1.8V VSENSE0+ GPIO0 FAULT0 FREQ GPIO1 FAULT1 PHASMD 1.8V VSENSE1+ ITH0 ITH0 ILIM ITH1 ITH1 MODE0 SYNC SYNC MODE1 GND * REFER TO LTC3887-1 DATA SHEET FOR MASTER SETUP 38701 TA01a 38701f For more information www.linear.com/LTC3870-1 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
