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Linear Technology Electronic Components Datasheet

LTC3870IUF-1 Datasheet

PolyPhase Step-Down Slave Controller

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LTC3870-1
Features
PolyPhase Step-Down
Slave Controller for Digital
Power System Management
Description
nn LTC3887-1 Phase Extender
nn Operates with Power Blocks, DrMOS or External
Gate Drivers and MOSFETs
nn Cascade with Multiple Chips for Very Large Current
Applications
nn Accurate PolyPhase Current Sharing
nn EXTVCC Capable of 5V to 14V Input
nn Wide VIN Range: 4.5V to 60V
nn Wide Output Voltage Range : 0.5V to 14V
nn Wide SYNC Frequency Range: 100kHz to 1MHz
nn Pin Programmable CCM/DCM Operation
nn Pin Programmable Phase-Shift Control
nn Available in a 24-Pin (4mm × 4mm) QFN Package
Applications
nn High Power Distributed Power Systems
nn Telecom Systems
nn Industrial Applications
The LTC®3870-1 is a PolyPhase® step-down slave control-
ler specially designed for multiphase operation with LTC's
digital power system management DC/DC controllers. It
provides a small and cost effective solution for supply-
ing very large currents by cascading it with a LTC3887-1
controller. A peak current mode architecture provides the
LTC3870-1 with excellent current sharing from phase to
phase and from chip to chip.
Coherently working with the LTC3887-1, the LTC3870-1
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 LTC3887-1 over a range of
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
7V TO 14V
22µF
4.7µF
VOUT0
3.3V, 30A
1.0µH
530µF
2.15k
0.2µF
DrMOS
LTC3887-1
RUN0
3.3V
RUN1
VSENSE0+ GPIO0
1.8V
GPIO1
VSENSE1+ ITH0
ITH1
SYNC
* REFER TO LTC3887-1 DATA SHEET
FOR MASTER SETUP
VIN INTVCC
VCC0
VCC1
LTC3870-1
PWM0
PWM1
DrMOS
ISENSE0+ ISENSE1+
ISENSE0- ISENSE1-
RUN0
RUN1
FAULT0
FAULT1
ITH0
ITH1
SYNC
EXTVCC
FREQ
PHASMD
ILIM
MODE0
MODE1
GND
82.5k
0.56µH
1.74k
0.2µF
Load Transient Response of a
2-Phase Master (3887-1)/Slave
(3870-1) Converter
ILOAD
20A/DIV
10A TO 20A TO 10A
VOUT1
1.8V, 40A
530µF
IL LTC3887–1
(CH0)
10A/DIV
IL LTC3870–1
(CH0)
10A/DIV
VOUT
200mV/DIV
AC–COUPLED
VIN = 12V
VOUT = 1.8V
100µs/DIV
38701 TA01b
38701 TA01a
For more information www.linear.com/LTC3870-1
38701f
1


Linear Technology Electronic Components Datasheet

LTC3870IUF-1 Datasheet

PolyPhase Step-Down Slave Controller

No Preview Available !

LTC3870-1
Absolute Maximum Ratings
(Note 1)
VIN.............................................................. –0.3V to 65V
VCC0, VCC1..................................................... –0.3V to 6V
ISENSE0+, ISENSE0−, ISENSE1+, ISENSE1−........ –0.3V to 15V
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 7)................100mA
Operating Junction
Temperature Range............................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
ISENSE0+ 1
ISENSE0– 2
RUN0 3
RUN1 4
ISENSE1– 5
ISENSE1+ 6
24 23 22 21 20 19
18 VCC0
17 VIN
25
16 GND
GND
15 EXTVCC
14 INTVCC
13 VCC1
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 46.9°C/W, θJC_BOT = 4.5°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
Order Information
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
–40°C to 125°C
LTC3870IUF-1#PBF
LTC3870IUF-1#TRPBF 38701
24-Lead (4mm × 4mm) 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.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
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
VIN
Input Voltage Range
VOUT
Output Voltage Range
IQ
Input Voltage Supply Current
Normal Operation
VUVLO
Undervoltage Lockout Threshold
when VIN > 4.2V
CONTROL LOOP
IISENSE0+,
IISENSE1+
IISENSE0–,
IISENSE1
Current Sense + Pin Current
Current Sense – Pin Current
CONDITIONS
(Note 3)
(Note 4)
VRUN0, VRUN1 = 0V
VRUN0, VRUN1 = 3.3V
VINTVCC Falling
VINTVCC Rising
VISENSE0,1+ = 3.3V
VISENSE0,1– = 3.3V
MIN TYP MAX UNITS
4.5
60
V
0.5
14
V
1.1
mA
2.6
mA
3.7
V
4.0
V
l
±0.1
±1
µA
l
±0.1
±1
µA
38701f
2
For more information www.linear.com/LTC3870-1


Part Number LTC3870IUF-1
Description PolyPhase Step-Down Slave Controller
Maker Linear
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