Datasheet

2
LTC3704
3704fb
(Note 1)
V
IN
Voltage ............................................... –0.3V to 36V
INTV
CC
Voltage ........................................... –0.3V to 7V
INTV
CC
Output Current ........................................ 50mA
GATE Voltage ........................... –0.3V to V
INTVCC
+ 0.3V
I
TH
Voltage ............................................... –0.3V to 2.7V
NFB Voltage .............................................. –2.7V to 2.7V
RUN, MODE/SYNC Voltages ....................... –0.3V to 7V
FREQ Voltage ............................................–0.3V to 1.5V
SENSE Pin Voltage ................................... – 0.3V to 36V
Operating Temperature Range (Note 2) .. – 40°C to 85°C
LTC3704E ............................................ –40°C to 85°C
LTC3704I........................................... –40°C to 125°C
Junction Temperature (Note 3)............................ 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC3704EMS
LTC3704IMS
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
MS PART MARKING
LTYT
LTCFW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= V
INTVCC
= 5V, V
RUN
= 1.5V, R
T
= 80k, V
MODE/SYNC
= 0V, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
V
IN(MIN)
Minimum Input Voltage 2.5 V
I
Q
Input Voltage Supply Current (V
INTVCC
= Open, No Switching) (Note 4)
Continuous Mode V
MODE/SYNC
= 5V, V
ITH
= 0.75V 550 1000 μA
Burst Mode Operation, No Load V
MODE/SYNC
= 0V, V
ITH
= 0V (Note 5) 250 500 μA
Shutdown Mode V
RUN
= 0V 10 20 μA
V
RUN
+
Rising RUN Input Threshold Voltage V
INTVCC
= Open 1.348 V
V
RUN
–
Falling RUN Input Threshold Voltage V
INTVCC
= Open 1.223 1.248 1.273 V
● 1.198 1.298 V
V
RUN(HYST)
RUN Pin Input Threshold Hysteresis 50 100 150 mV
I
RUN
RUN Input Current 1 100 nA
V
NFB
Negative Feedback Voltage V
ITH
= 0.4V (Note 5) –1.218 –1.230 –1.242 V
V
ITH
= 0.4V (Note 5) ● –1.212 –1.248 V
V
ITH
= 0.4V (I-Grade) (Notes 2 and 5) ● –1.205 –1.255 V
I
NFB
NFB Pin Input Current 7.5 15 μA
ΔV
NFB
Line Regulation 2.5V ≤ V
IN
≤ 30V 0.002 0.02 %/V
ΔV
IN
ΔV
NFB
Load Regulation V
MODE/SYNC
= 0V, V
ITH
= 0.5V to 0.90V (Note 5) ● –1 –0.1 %
ΔV
ITH
g
m
Error Amplifier Transconductance I
TH
Pin Load = ±5μA (Note 5) 650 μmho
V
ITH(BURST)
Burst Mode Operation I
TH
Pin Voltage Falling I
TH
Voltage 0.17 V
V
SENSE(MAX)
Maximum Current Sense Input Threshold Duty Cycle < 20% 120 150 180 mV
I
SENSE(ON)
SENSE Pin Current (GATE High) V
SENSE
= 0V 40 75 μA
I
SENSE(OFF)
SENSE Pin Current (GATE Low) V
SENSE
= 30V 0.1 5 μA
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
T
JMAX
= 125°C, θ
JA
= 120°C/ W
1
2
3
4
5
RUN
I
TH
NFB
FREQ
MODE/
SYNC
10
9
8
7
6
SENSE
V
IN
INTV
CC
GATE
GND
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