Datasheet

LTC3708
2
3708fb
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
(Note 1)
32 31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
33
UH PACKAGE
32-LEAD (5mm s 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1RUN/SS
I
TH1
V
FB1
TRACK1
SGND
TRACK2
V
FB2
I
TH2
SENSE1
–
PGND1
BG1
DRV
CC
BG2
PGND2
SENSE2
–
V
CC
V
RNG1
FCB PGOOD I
ON1
BOOST1 TG1 SW1 SENSE1
+
EXTLPF
INTLPF
V
RNG2
I
ON2
BOOST2
TG2
SW2
SENSE2
+
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
LTC3708EUH#PBF LTC3708EUH#TRPBF 3708
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3708EUH LTC3708EUH#TR 3708
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
Input Supply Voltage (V
CC
, DRV
CC
) ............. 7V to –0.3V
Boosted Topside Driver Supply Voltage
BOOST1, 2 ............................................ 42V to –0.3V
Switch Voltage (SW1, 2) .............................. 36V to –5V
SENSE1
+
, SENSE2
+
Voltages ....................... 36V to –5V
SENSE1
–
, SENSE2
–
Voltages .................... 10V to –0.3V
I
ON1
, I
ON2
Voltages .................................... 21V to –0.3V
(BOOST – SW) Voltages .............................. 7V to –0.3V
RUN/SS, PGOOD Voltages .......................... 7V to –0.3V
PGOOD DC Current ................................................. 5mA
TRACK1, TRACK2 Voltages ..............V
CC
+ 0.3V to –0.3V
V
RNG1
, V
RNG2
Voltages .................... V
CC
+ 0.3V to –0.3V
I
TH1
, I
TH2
Voltages.................................... 2.7V to –0.3V
V
FB1
, V
FB2
Voltages .................................. 2.7V to –0.3V
INTLPF, EXTLPF Voltages ......................... 2.7V to –0.3V
FCB Voltages ............................................... 7V to –0.3V
Operating Temperature Range (Note 5).... –40°C to 85°C
Junction Temperature (Note 2) ........................... 125°C
Storage Temperature Range ................... –65°C to 125°C
Refl ow Peak Body Temperature ........................... 260°C
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 5V, DRV
CC
= 5V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
I
Q
Input DC Supply Current
Normal
Shutdown
2.4
250
3
400
mA
μA
I
FB1,2
Feedback Pin Input Current I
TH
= 1.2V (Notes 3, 4) –50 –100 nA
V
REF
Internal Reference Voltage I
TH
= 1.2V, 0°C to 85°C (Notes 3, 4)
I
TH
= 1.2V (Notes 3, 4)
l
0.594
0.591
0.600
0.600
0.606
0.609
V
V
V
FB1,2
Feedback Voltage I
TH
= 1.2V (Note 3) 0.594 0.600 0.606 V
ΔV
FB(LINEREG)1,2
Feedback Voltage Line Regulation V
CC
= 4.5V to 6.5V (Note 3) 0.02 %/V