LTC3870-1 PolyPhase Step-Down Slave Controller for Digital Power System Management Fea T Descrip T 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 EXTV Capable of 5V to 14V Input LTC3870-1 with excellent current sharing from phase to CC n Wide V Range: 4.5V to 60V phase and from chip to chip. IN 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 2 does not require additional I C 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. L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks a T 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 6580258, 5408150 High Power Distributed Power Systems n Telecom Systems n Industrial Applications Typical a T Load Transient Response of a 2-Phase Master (3887-1)/Slave V IN 7V TO 14V (3870-1) Converter 22F 4.7F V INTV IN CC I LOAD 20A/DIV V V CC0 CC1 10A TO 20A TO 10A LTC3870-1 I LTC38871 V L V OUT0 OUT1 (CH0) 1.0H 0.56H 3.3V, 30A 1.8V, 40A 10A/DIV DrMOS PWM0 PWM1 DrMOS I LTC38701 L 2.15k 1.74k 530F 530F (CH0) 0.2F 0.2F 10A/DIV I + I + V OUT SENSE0 SENSE1 200mV/DIV I - I - SENSE0 SENSE1 ACCOUPLED 38701 TA01b 100s/DIV EXTV LTC3887-1 CC V = 12V RUN0 RUN0 IN RUN1 RUN1 V = 1.8V 82.5k 3.3V OUT V + GPIO0 FAULT0 FREQ SENSE0 GPIO1 FAULT1 PHASMD 1.8V V + I I I SENSE1 TH0 TH0 LIM I I MODE0 TH1 TH1 SYNC SYNC MODE1 GND * REFER TO LTC3887-1 DATA SHEET FOR MASTER SETUP 38701 TA01a 38701f 1 For more information www.linear.com/LTC3870-1 ion pplica ions pplica ion uresLTC3870-1 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW V ............................................................. 0.3V to 65V IN V , V .................................................... 0.3V to 6V CC0 CC1 I +, I , I +, I ....... 0.3V to 15V SENSE0 SENSE0 SENSE1 SENSE1 24 23 22 21 20 19 INTV , RUN0/RUN1 .................................. 0.3V to 6V CC + I 1 18 V SENSE0 CC0 EXTV .................................................... 0.3V to 14V CC I 2 17 V SENSE0 IN MODE0/MODE1, RUN0 GND 3 25 16 GND FREQ, PHASMD, I ........................0.3V to INTV RUN1 4 15 EXTV LIM CC CC FAULT0/FAULT1, I /I , SYNC .............. 0.3V to 3.6V I 5 14 INTV SENSE1 CC TH0 TH1 + I 6 13 V INTV , EXTV Peak Current (Note 7) ...............100mA SENSE1 CC1 CC CC Operating Junction 7 8 9 10 11 12 Temperature Range ............................ 40C to 125C Storage Temperature Range .................. 65C to 150C UF PACKAGE 24-LEAD (4mm 4mm) PLASTIC QFN T = 125C, = 46.9C/W, = 4.5C/W JMAX JA JC BOT EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3870EUF-1 PBF LTC3870EUF-1 TRPBF 38701 24-Lead (4mm 4mm) Plastic QFN 40C to 125C LTC3870IUF-1 PBF LTC3870IUF-1 TRPBF 38701 40C to 125C 24-Lead (4mm 4mm) Plastic QFN Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: