LTC3868 Datasheet, PDF (2/38 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller

LTC3868
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage (V_IN).......................... –0.3V to 28V
Topside Driver Voltages
BOOST1, BOOST2 ................................. –0.3V to 34V
Switch Voltage (SW1, SW2) ......................... –5V to 28V
(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 16V
PLLIN/MODE, 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 Temperature Range (Note 2) ... –40°C to 85°C
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
LTC3868EUH#PBF
LTC3868EUH#TRPBF 3868
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3868IUH#PBF
LTC3868IUH#TRPBF 3868
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°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
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 12V, V_RUN1,2 = 5V, EXTV_CC = 0V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_IN
V_FB1,2
I_FB1,2
V_REFLNREG
V_LOADREG
Input Supply Operating Voltage Range
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
(Note 4) I_TH1,2 Voltage = 1.2V
(Note 4)
(Note 4) V_IN = 4.5V to 24V
(Note4)
Measured in Servo Loop,
∆I_TH Voltage = 1.2V to 0.7V
(Note4)
Measured in Servo Loop,
∆I_TH Voltage = 1.2V to 2V
4
24
V
l 0.788 0.8 0.812
V
±5
±50
nA
0.002 0.02 %/V
l
0.01
0.1
%
l
–0.01 –0.1
%
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