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LTC3709 Datasheet, PDF (2/24 Pages) Linear Technology – Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing
◁
LTC3709
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VCC, DRVCC) ............ 7V to – 0.3V
Boosted Topside Driver Supply Voltage
(BOOST1, BOOST2) .................................. 37V to – 0.3V
Switch Voltage (SW1, 2) ............................. 31V to – 1V
SENSE1+, SENSE2+ Voltages ....................... 31V to – 1V
SENSE1–, SENSE2– Voltages .................... 10V to – 0.3V
ION Voltage ............................................... 31V to –0.3V
(BOOST – SW) Voltages ..............................7V to – 0.3V
RUN/SS, PGOOD Voltages .......................... 7V to – 0.3V
TRACK Voltage ............................................7V to – 0.3V
VRNG Voltage ................................. VCC + 0.3V to – 0.3V
ITH Voltage ............................................... 2.7V to – 0.3V
VFB Voltage .............................................. 2.7V to – 0.3V
INTLPF, EXTLPF Voltages ........................ 2.7V to – 0.3V
VOS+, VOS– Voltages ................................... 7V to – 0.3V
FCB Voltage ................................................ 7V to – 0.3V
Operating Temperature Range ................ – 40°C to 85°C
Junction Temperature (Note 2) ............................ 125°C
Storage Temperature Range ................ – 65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
32 31 30 29 28 27 26 25
RUN/SS 1
24 SENSE1–
ITH 2
VFB 3
TRACK 4
SGND 5
23 PGND1
22 BG1
21 DRVCC
33
20 BG2
SGND 6
VOS– 7
DIFFOUT 8
19 PGND2
18 SENSE2–
17 VCC
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
EXPOSED PAD IS SGND (PIN 33)
MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 34°C/ W
ORDER PART NUMBER UH PART MARKING
LTC3709EUH
3709
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = DRVCC = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Main Control Loop
IQ
Input DC Supply Current
Normal
Shutdown
2.4
3
25
65
IFB
VFB
∆VFB(LINEREG)
∆VFB(LOADREG)
gm(EA)
tON
FB Pin Input Current
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
On-Time
tON(MIN)
tOFF(MIN)
Minimum On-Time
Minimum Off-Time
ITH = 1.2V (Note 3)
ITH = 1.2V (Note 3)
VIN = 4V to 6.5V (Note 3)
ITH = 0.5V to 2V (Note 3)
ITH = 1.2V (Note 3)
VIN = 20V, ION = 180µA
VIN = 20V, ION = 90µA
VIN = 20V, ION = 540µA
VIN = 20V, ION = 90µA
● 0.594
1.3
90
180
– 35
0.600
0.02
– 0.12
1.45
116
233
45
250
– 60
0.606
– 0.2
1.6
140
280
100
350
UNITS
mA
µA
nA
V
%/V
%
mS
ns
ns
ns
ns
3709f
2
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