LTC3870_15 Datasheet, PDF (2/22 Pages) Linear Technology – PolyPhase Step-Down Slave Controller for LTC3880/LTC3883 with Digital Power System Management

LTC3870
Absolute Maximum Ratings
(Note 1)
V_IN.............................................................. –0.3V to 65V
BOOST0, BOOST1........................................–0.3V to 71V
SW0, SW1..................................................... –5V to 65V
I_SENSE0+, I_SENSE0−, I_SENSE1+, I_SENSE1–..........–0.3V to 15V
(BOOST0-SW0), (BOOST1-SW1).................. –0.3V to 6V
INTV_CC, RUN0/RUN1.................................... –0.3V to 6V
EXTV_CC....................................................... –0.3V to 14V
MODE0/MODE1, FREQ, PHASMD, I_LIM....–0.3V to INTV_CC
FAULT0/FAULT1, I_TH0/I_TH1, SYNC............... –0.3V to 3.6V
INTV_CC, EXTV_CC 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
I_SENSE0+ 2
I_SENSE0– 3
RUN0 4
RUN1 5
I_SENSE1– 6
I_SENSE1+ 7
29
SGND
22 BOOST0
21 BG0
20 V_IN
19 PGND
18 EXTV_CC
17 INTV_CC
16 BG1
MODE1 8
15 BOOST1
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 43°C/W, θ_{JC_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 T_A = 25°C. (Note 2) V_IN = 15V, V_RUN0,V_RUN1 = 3.3V, f_SYNC = 350kHz
(externally driven) unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_IN
V_OUT
I_Q
V_UVLO
Input Voltage Range
Output Voltage Range
Input Voltage Supply Current
Normal Operation
Undervoltage Lockout Threshold
When V_IN > 4.2V
(Note 3)
4.5
60
V
(Note 4)
0.5
14
V
V_RUN0,V_RUN1 = 0V (Note 5)
1.1
mA
V_RUN0,V_RUN1 = 3.3V, No Caps on TG and BG
2.6
mA
V_INTVCC Falling
V_INTVCC Rising
3.7
V
4.0
V
3870fa
2
For more information www.linear.com/LTC3870