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Linear Technology Electronic Components Datasheet

LTC3870IUFD Datasheet

PolyPhase Step-Down Slave Controller

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LTC3870
Features
PolyPhase Step-Down
Slave Controller for Digital
Power System Management
Description
n LTC3880 Family Phase Extender Supporting
LTC3880/3880-1, LTC3883/3883-1, LTC3886,
LTC3887 Master Controllers
n Cascade with Multiple Chips for Very Large Current
Applications
n Accurate PolyPhase Current Sharing
n EXTVCC Capable of 5V to 14V Input
n Wide VIN Range: 4.5V to 60V
n Wide Output Voltage Range : 0.5V to 14V
n Wide SYNC Frequency Range: 100kHz to 1MHz
n Pin Programmable of CCM/DCM Operation
n Pin Programmable of Phase-Shift Control
n Integrated Powerful N-Channel MOSFET Gate Drivers
n Available in a 28-Pin (4mm × 5mm) QFN Package
Applications
n High Power Distributed Power Systems
n Telecom Systems
n Industrial Applications
The LTC®3870 is a PolyPhase® step-down slave control-
ler specially designed for multiphase operation with the
LTC3880 family digital power system management DC/DC
controllers. It provides a small and cost effective solution
for supplying very large currents by cascading it with a
master controller. A peak current mode architecture pro-
vides the LTC3870 with excellent current sharing from
phase to phase and from chip to chip.
Coherently working with the LTC3880 family, the LTC3870
does not require additional I2C addresses, and it supports
all programmable features as well as fault protection.
The constant switching frequency can be synchronized
to an external clock from the master controller from
100kHz to 1MHz.
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,
6580258, 5408150
Typical Application
VIN
4.7µF
VOUT0
30A
1.0µH
+ 530µF
2.15k
0.2µF
0.1µF
LTC3880*
RUN0
3.3V
VSENSE0+
RUN1
GPIO0
GPIO1
1.8V VSENSE1
ITH0
ITH1
SYNC
* REFER TO LTC3880 DATA SHEET
FOR MASTER SETUP
VIN
INTVCC
TG0
TG1
BOOST0 BOOST1
SW0
SW1
BG0
BG1
PGND
EXTVCC
LTC3870
IISSEENNSSEE00+– IISSEENNSSEE11+–
0.1µF
0.56µH
VOUT1
40A
1.74k
0.2µF
+ 530µF
RUN0
RUN1
FAULT0
FAULT1
ITH0
ITH1
SYNC
FREQ
PHASMD
ILIM
MODE0
MODE1
SGND
100k
Load Transient Response of a
2-Phase Master (3880)/Slave
(3870) Converter
ILOAD
10A/DIV
0A TO 10A TO 0A
IL_3880(CH1)
10A/DIV
IL_3870(CH1)
10A/DIV
VOUT1
100mV/DIV
AC-COUPLED
VIN = 12V
VOUT1 = 1.8V
50µs/DIV
3870 TA01b
3870 TA01a
3870fb
For more information www.linear.com/LTC3870
1


Linear Technology Electronic Components Datasheet

LTC3870IUFD Datasheet

PolyPhase Step-Down Slave Controller

No Preview Available !

LTC3870
Absolute Maximum Ratings
(Note 1)
VIN.............................................................. –0.3V to 65V
BOOST0, BOOST1........................................–0.3V to 71V
SW0, SW1..................................................... –5V to 65V
ISENSE0+, ISENSE0−, ISENSE1+, ISENSE1–..........–0.3V to 15V
(BOOST0-SW0), (BOOST1-SW1).................. –0.3V to 6V
INTVCC, RUN0/RUN1.................................... –0.3V to 6V
EXTVCC....................................................... –0.3V to 14V
MODE0/MODE1, FREQ, PHASMD, ILIM....–0.3V to INTVCC
FAULT0/FAULT1, ITH0/ITH1, SYNC............... –0.3V to 3.6V
INTVCC, EXTVCC Peak Current (Note 9)................100mA
Operating Junction Temperature Range
........................................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
28 27 26 25 24 23
MODE0 1
ISENSE0+ 2
ISENSE0– 3
RUN0 4
RUN1 5
ISENSE1– 6
ISENSE1+ 7
29
SGND
22 BOOST0
21 BG0
20 VIN
19 PGND
18 EXTVCC
17 INTVCC
16 BG1
MODE1 8
15 BOOST1
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W, θJC_BOT = 3.4°C/W
EXPOSED PAD (PIN 29) IS SGND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3870EUFD#PBF
LTC3870EUFD#TRPBF 3870
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3870IUFD#PBF
LTC3870IUFD#TRPBF 3870
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 15V, VRUN0,VRUN1 = 3.3V, fSYNC = 350kHz
(externally driven) unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
VOUT
IQ
VUVLO
Input Voltage Range
Output Voltage Range
Input Voltage Supply Current
Normal Operation
Undervoltage Lockout Threshold
When VIN > 4.2V
(Note 3)
4.5
60
V
(Note 4)
0.5
14
V
VRUN0,VRUN1 = 0V (Note 5)
1.1
mA
VRUN0,VRUN1 = 3.3V, No Caps on TG and BG
2.6
mA
VINTVCC Falling
VINTVCC Rising
3.7
V
4.0
V
3870fb
2
For more information www.linear.com/LTC3870


Part Number LTC3870IUFD
Description PolyPhase Step-Down Slave Controller
Maker Linear Technology
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LTC3870IUFD Datasheet PDF






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