LTC3870_15 Datasheet, PDF (22/22 Pages) Linear Technology – PolyPhase Step-Down Slave Controller for LTC3880/LTC3883 with Digital Power System Management

LTC3870
Typical Application
4-Phase 1.5V Step-Down Converter with Sensing Resistors and External V_CC
V_IN
6V TO 24V
4.7µF
5V_CC
84.5k
V_IN
INTV_CC
TG0
PHASMD
EXTV_CC
FREQ
BOOST0
SW0
BG0
MODE0
MODE1
I_LIM
SGND
I_SENSE0+
I_SENSE0–
LTC3880-1*
RUN0
5V_{CC EXTVCC RUN1}
GPIO0
1.5V _VSENSE0+
V_SENSE1
GPIO1
I_TH0
I_TH1
SYNC
* REFER TO LTC3880 DATA SHEET
FIGURE TA04 FOR MASTER SETUP
LTC3870
TG1
RUN0
RUN1 BOOST1
FAULT0
FAULT1
I_TH0
I_TH1
SYNC
SW1
BG1
PGND
I_SENSE1+
I_SENSE1–
0.1µF
100Ω
1000pF
100Ω
0.42µH 0.0015Ω
530µF
V_OUT
1.5V
80A
0.1µF
100Ω
1000pF 100Ω
0.42µH 0.0015Ω
530µF
3870 TA04
Related Parts
PART NUMBER
LTC3880/LTC3880-1
LTC3883/LTC3883-1
LTC3882
LTC2974
LTC2977
LTM4676
DESCRIPTION
Dual Output Multiphase Step-Down Controller with Digital
Power System Management
Single Output Step-Down Controller with Digital Power
System Management
Dual Output Multiphase Step-Down DC/DC Voltage Mode
Controller with Digital Power System Management
4-Channel PMBus Power System Manager Featuring
Accurate Output Current Measurement
8-Channel PMBus Power System Manager Featuring
Accurate Output Voltage Measurement
Dual 13A or Single 26A µModule Regulator with Digital
Power System Management
COMMENTS
V_IN Up to 24V, 0.5V ≤ V_OUT ≤ 5.5V, Analog Control Loop, I²C/
PMBus Interface with EEPROM and 16-Bit ADC
V_IN Up to 24V, 0.5V ≤ V_OUT ≤ 5.5V, Analog Control Loop, I²C/
PMBus Interface with EEPROM and 16-Bit ADC
V_IN Up to 38V, 0.5V ≤ V_OUT ≤ 5.25V, Analog Control Loop, I²C/
PMBus Interface with EEPROM and 16-Bit ADC
0.25% TUE 16-Bit ADC, Voltage/Current/Temperature
Monitoring and Supervision
Fault Logging to Internal EPROM, Monitors Eight Output
Voltage Channels and One Input Voltage
4.5V ≤ V_IN ≤ 26.5V, 0.5V ≤ V_OUT ≤ 5.4V, 16mm × 16mm ×
5.01mm BGA Package
22 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_Fo3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC3870}
[phone] ^● FAX: [phone] ^● www.linear.com/LTC3870
3870fa
LT 0814 REV A • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2014