LTC1871 Linear Technology, LTC1871 Datasheet - Page 2

• Manufacturer Part Number: LTC1871
• Description: Wide Input Range/ No RSENSE Current Mode Boost/ Flyback and SEPIC Controller
• Manufacturer: Linear Technology

ABSOLUTE AXI U RATI GS
LTC1871
(Note 1)
V
INTV
INTV
GATE Voltage ........................... – 0.3V to V
I
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
Junction Temperature (Note 3) ............................ 125 C
Storage Temperature Range ................. – 65 C to 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
ELECTRICAL CHARACTERISTICS
The
V
SYMBOL
Main Control Loop
V
I
V
V
V
I
V
I
g
V
V
I
I
2
Q
RUN
FB
SENSE(ON)
SENSE(OFF)
TH
m
IN(MIN)
RUN
RUN
RUN(HYST)
FB
V
V
V
V
ITH(BURST)
SENSE(MAX)
IN
IN
V
FB
IN
ITH
FB(OV)
FB
, FB Voltages ....................................... – 0.3V to 2.7V
= V
Voltage ............................................... – 0.3V to 36V
+
–
CC
CC
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
INTVCC
Voltage ........................................... – 0.3V to 7V
Output Current ........................................ 50mA
PARAMETER
Minimum Input Voltage
Input Voltage Supply Current
Rising RUN Input Threshold Voltage
Falling RUN Input Threshold Voltage
RUN Pin Input Threshold Hysteresis
RUN Input Current
Feedback Voltage
FB Pin Input Current
Line Regulation
Load Regulation
Error Amplifier Transconductance
Burst Mode Operation I
Maximum Current Sense Input Threshold
SENSE Pin Current (GATE High)
SENSE Pin Current (GATE Low)
= 5V, V
FB Pin, Overvoltage Lockout
Continuous Mode
Burst Mode Operation, No Load
Shutdown Mode
RUN
W
= 1.5V, R
W W
TH
FREQ
Pin Voltage
= 80k, V
MODE/SYNC
INTVCC
U
CONDITIONS
(Note 4)
V
V
V
V
V
2.5V V
V
V
I
Falling I
Duty Cycle < 20%
V
V
TH
MODE/SYNC
MODE/SYNC
RUN
ITH
ITH
MODE/SYNC
FB(OV)
SENSE
SENSE
Pin Load = 5 A (Note 5)
= 0.2V (Note 5)
= 0.2V (Note 5)
+ 0.3V
= 0V
= 0V, unless otherwise specified.
= 0V
= 30V
– V
TH
IN
Voltage (Note 5)
FB(NOM)
= 5V, V
= 0V, V
= 0V, V
30V
in Percent
PACKAGE/ORDER I FOR ATIO
FB
ITH
TH
Consult LTC Marketing for parts specified with wider operating temperature ranges.
MODE/
= 1.4V, V
= 0.5V to 0.90V (Note 5)
= 0.2V (Note 5)
SYNC
FREQ
RUN
I
FB
TH
T
JMAX
10-LEAD PLASTIC MSOP
1
2
3
4
5
ITH
= 125 C,
MS PACKAGE
TOP VIEW
= 0.75V
JA
= 120 C/ W
10
9
8
7
6
SENSE
V
INTV
GATE
GND
IN
CC
1.223
1.198
1.218
1.212
MIN
120
2.5
2.5
– 1
50
U
MS PART MARKING
1.348
1.248
1.230
0.002
– 0.1
TYP
550
250
100
650
150
0.3
0.1
10
18
35
ORDER PART
1
6
LTC1871EMS
NUMBER
W
LTSX
A
= 25 C.
1.273
1.298
1.242
1.248
MAX
1000
0.02
500
150
180
20
60
60
10
50
5
UNITS
U
mho
%/V
mV
mV
nA
nA
%
%
V
A
A
A
V
V
V
V
V
V
A
A