LTC3858_15 Datasheet, PDF (2/38 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller

LTC3858
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (V_IN) ......................... –0.3V to 40V
Topside Driver Voltages
BOOST1, BOOST2 ................................. –0.3V to 46V
Switch Voltage (SW1, SW2) ........................ –5V to 40V
PLLIN/MODE,(BOOST1-SW1),
(BOOST2-SW2) ........................................... –0.3V to 6V
RUN1, RUN2 ............................................... –0.3V to 8V
Maximum Current Sourced into Pin
from Source >8V...............................................100μA
SENSE1⁺, SENSE2⁺, SENSE1^–
SENSE2^– Voltages...................................... –0.3V to 28V
FREQ Voltages ..................................... –0.3V to INTV_CC
I_LIM, PHASMD Voltages ....................... –0.3V to INTV_CC
EXTV_CC ...................................................... –0.3V to 14V
I_TH1, I_TH2,V_FB1, V_FB2 Voltages ...................... –0.3V to 6V
PGOOD1, PGOOD2 Voltages ....................... –0.3V to 6V
SS1, SS2, INTV_CC Voltages ......................... –0.3V to 6V
Operating Junction Temperature Range
(Note 2).................................................. –40°C to 125°C
Maximum Junction Temperature (Note 3) ............ 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
32 31 30 29 28 27 26 25
SENSE1^– 1
24 BOOST1
FREQ 2
23 BG1
PHASMD 3
CLKOUT 4
PLLIN/MODE 5
SGND 6
RUN1 7
33
SGND
22 V_IN
21 PGND
20 EXTV_CC
19 INTV_CC
18 BG2
RUN2 8
17 BOOST2
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm s 5mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3858EUH#PBF
LTC3858EUH#TRPBF 3858
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3858IUH#PBF
LTC3858IUH#TRPBF
3858
32-Lead (5mm × 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 non-standard 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 full operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). V_IN = 12V, V_RUN1,2 = 5V, EXTV_CC = 0V unless
otherwise noted.
SYMBOL
V_IN
V_FB1,2
PARAMETER
Input Supply Operating Voltage Range
Regulated Feedback Voltage
I_FB1,2
V_REFLNREG
Feedback Current
Reference Voltage Line Regulation
CONDITIONS
(Note 4) I_TH1,2 = 1.2V
–40°C to 125°C
–40°C to 85°C
(Note 4)
(Note 4) V_IN = 4.5V to 38V
MIN TYP MAX UNITS
4
38
V
l 0.788 0.800 0.812
V
0.792 0.800 0.808
V
±5
±50
nA
0.002 0.02
%/V
3858fc
2