LTC3731CUH Linear Technology, LTC3731CUH Datasheet - Page 2

• Manufacturer Part Number: LTC3731CUH
• Description: IC SW REG CTRLR SYNC BUCK 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3731CUH

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 6 V
• Frequency - Switching: 225kHz ~ 680kHz
• Voltage - Input: 4 ~ 36 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Power - Output: -

ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
LTC3731
Topside Driver Voltages (BOOST
Switch Voltage (SW
Boosted Driver Voltage (BOOST
Peak Output Current <1ms (TG
Supply Voltages (V
Pin Voltage .................................................. 7V to –0.3V
RUN/SS, PLLFLTR, PLLIN, UVADJ,
FCB Voltages ............................................. V
SENSE
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
SYMBOL
Main Control Loop
V
temperature range, otherwise specifications are at T
2
REGULATED
Order Options
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
+
, SENSE
PARAMETER
Regulated Voltage at IN
Tape and Reel: Add #TR
T
JMAX
–
ORDER PART NUMBER
SENSE1
SENSE1
SENSE2
SENSE2
SENSE3
SENSE3
PLLFLTR
DIFFOUT
RUN/SS
Voltages ........................ 5.5V to –0.3V
UVADJ
W
PLLIN
SGND
EAIN
= 125°C, θ
CC
FCB
V
IN
IN
I
http://www.linear.com/leadfree/
N
CC
TH
+
–
+
–
+
–
–
+
)................................... 32V to –5V
, V
LTC3731CG
LTC3731IG
36-LEAD PLASTIC SSOP
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
DR
G PACKAGE
JA
TOP VIEW
), PGOOD
W W
= 95°C/W, θ
+
N
U
N
, BG
N
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
– SW
) ............ 38V to –0.3V
JC
CLKOUT
PGOOD
BOOST1
TG1
SW1
BOOST2
TG2
SW2
V
BG1
PGND
BG2
BG3
SW3
TG3
BOOST3
PHASMD
SGND2
= 32°C/W
DR
N
) ..................... 5A
N
) .... 7V to –0.3V
W
CONDITIONS
V
LTC3731I
U
ITH
CC
A
= 1.2V (Note 3)
= 25°C. V
to –0.3V
The
U
(Note 1)
●
CC
denotes the specifications which apply over the full operating
= V
I
Operating Ambient Temperature Range
LTC3731C .................................................... 0°C to 70°C
LTC3731I ................................................. –40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ..................–65°C to 125°C
Lead Temperature G Package (Soldering, 10sec).. 300°C
Peak Body Temperature UH Package ................... 240°C
RUN/SS
ORDER PART NUMBER
TH
Voltage ................................................ 2.4V to –0.3V
LTC3731CUH
LTC3731IUH
= 5V unless otherwise noted.
SENSE1
SENSE1
SENSE2
SENSE2
SENSE3
DIFFOUT
EAIN
EXPOSED PAD (PIN 33) IS SIGNAL GROUND
IN
(SGND) AND MUST BE SOLDERED TO PCB
–
+
–
+
–
–
1
2
3
4
5
6
7
8
T
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
JMAX
32-LEAD PLASTIC QFN
= 125°C, θ
UH PACKAGE
●
●
33
0.596
0.594
0.591
JA
MIN
= 34°C/W
UH PART MARKING
24
23
22
21
20
19
18
17
0.600
0.600
TYP
BOOST2
TG2
SW2
V
BG1
PGND
BG2
BG3
3731
3731I
CC
0.604
0.606
0.609
MAX
UNITS
3731fb
V
V
V