LTC3709 Linear Technology, LTC3709 Datasheet - Page 2

• Manufacturer Part Number: LTC3709
• Description: No RSENSE Synchronous DC/DC Controller
• Manufacturer: Linear Technology

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LTC3709
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (V
Boosted Topside Driver Supply Voltage
(BOOST1, BOOST2) .................................. 37V to – 0.3V
Switch Voltage (SW1, 2) ............................. 31V to – 1V
SENSE1
SENSE1
I
(BOOST – SW) Voltages ..............................7V to – 0.3V
RUN/SS, PGOOD Voltages .......................... 7V to – 0.3V
TRACK Voltage ............................................7V to – 0.3V
V
I
V
INTLPF, EXTLPF Voltages ........................ 2.7V to – 0.3V
V
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
2
ELECTRICAL CHARACTERISTICS
SYMBOL
Main Control Loop
I
I
V
∆V
∆V
g
t
t
t
ON
TH
temperature range, otherwise specifications are at T
Q
FB
ON
ON(MIN)
OFF(MIN)
RNG
FB
OS
FB
m(EA)
FB(LINEREG)
FB(LOADREG)
Voltage ............................................... 2.7V to – 0.3V
Voltage ............................................... 31V to –0.3V
+
Voltage .............................................. 2.7V to – 0.3V
, V
Voltage ................................. V
OS
+
–
, SENSE2
, SENSE2
–
Voltages ................................... 7V to – 0.3V
PARAMETER
Input DC Supply Current
FB Pin Input Current
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
On-Time
Minimum On-Time
Minimum Off-Time
Normal
Shutdown
W
+
–
Voltages ....................... 31V to – 1V
Voltages .................... 10V to – 0.3V
CC
, DRV
W W
CC
) ............ 7V to – 0.3V
CC
+ 0.3V to – 0.3V
U
A
= 25°C. V
CONDITIONS
I
I
V
I
I
V
V
V
V
The
TH
TH
TH
TH
IN
IN
IN
IN
IN
= 1.2V (Note 3)
= 1.2V (Note 3)
= 0.5V to 2V (Note 3)
= 1.2V (Note 3)
= 4V to 6.5V (Note 3)
= 20V, I
= 20V, I
= 20V, I
= 20V, I
●
CC
denotes specifications which apply over the full operating
= DRV
PACKAGE/ORDER I FOR ATIO
ON
ON
ON
ON
Consult LTC Marketing for parts specified with wider operating temperature ranges.
= 180µA
= 90µA
= 540µA
= 90µA
ORDER PART NUMBER
CC
= 5V, unless otherwise noted.
LTC3709EUH
DIFFOUT
RUN/SS
TRACK
SGND
SGND
V
V
OS
I
TH
FB
–
1
2
3
4
5
6
7
8
32-LEAD (5mm × 5mm) PLASTIC QFN
32 31 30 29 28 27 26 25
9 10 11 12
EXPOSED PAD IS SGND (PIN 33)
T
MUST BE SOLDERED TO PCB
JMAX
●
= 125°C, θ
UH PACKAGE
TOP VIEW
0.594
33
MIN
180
1.3
90
13 14 15 16
JA
U
= 34°C/ W
UH PART MARKING
– 0.12
0.600
0.02
1.45
TYP
– 35
116
233
250
2.4
25
45
3709
W
24
23
22
21
20
19
18
17
SENSE1
PGND1
BG1
DRV
BG2
PGND2
SENSE2
V
0.606
MAX
– 0.2
CC
– 60
140
280
100
350
1.6
65
3
CC
–
–
UNITS
U
3709f
%/V
mA
mS
µA
nA
ns
ns
ns
ns
%
V