Datasheet

2
LTC1771
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 10V, V
RUN
= open unless otherwise specified.
LTC1771EMS8
T
JMAX
= 125°C, θ
JA
= 200°C/W
ORDER PART
NUMBER
Input Supply Voltage (V
IN
)........................ –0.3V to 20V
Peak Driver Output Current < 10µs (PGATE) ............. 1A
RUN/SS Voltage ......................... –0.3V to (V
IN
+ 0.3V)*
MODE Voltage .......................................... –0.3V to 20V
I
TH
, V
FB
Voltage .......................................... –0.3V to 5V
SENSE Voltage (V
IN
> 12V)..(V
IN
– 12V) to (V
IN
+ 0.3V)*
SENSE Voltage (V
IN
≤ 12V) ........ –0.3V to (V
IN
+ 0.3V)*
(Note 1)
Consult factory for Military grade parts.
Junction Temperature (Note 2)............................ 125°C
Operating Temperature Range (Note 3)
LTC1771E......................................... –40°C to 85°C
LTC1771I ......................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
LTC1771ES8
LTC1771IS8
ORDER PART
NUMBER
RUN/SS
I
TH
V
FB
GND
1
2
3
4
8
7
6
5
MODE
SENSE
V
IN
PGATE
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
TOP VIEW
MODE
SENSE
V
IN
PGATE
RUN/SS
I
TH
V
FB
GND
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
T
JMAX
= 125°C, θ
JA
= 110°C/W
S8 PART MARKING
1771
1771I
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
FB
Feedback Voltage (Note 5) ● 1.205 1.230 1.255 V
I
FB
Feedback Current (Note 5) ● 110 nA
I
SUPPLY
No-Load Supply Current V
IN
= 10V, I
LOAD
= 0 (Note 6) 10 µA
∆V
LINEREG
Reference Voltage Line Regulation V
IN
= 5V to 15V (Note 5) ● 0.003 0.03 %/V
∆V
LOADREG
Output Voltage Load Regulation I
TH
= 0.5V to 2V, Burst Disabled (Note 5) ● 0.25 1 %
I
Q
Input DC Supply Current (Note 4)
Active Mode (PGATE = 0V) V
IN
= 2.8V to 18V 150 235 µA
Sleep Mode (Note 6) V
IN
= 2.8V to 18V, V
FB
= 1.5V 9 15 µA
Shutdown V
IN
= 2.8V to 18V, V
RUN
= 0V 2 6 µA
Short Circuit V
IN
= 2.8V to 18V, V
FB
= 0V 175 275 µA
∆V
SENSE(MAX)
Maximum Current Sense Threshold V
FB
= V
REF
– 20mV ● 110 140 180 mV
∆V
SENSE(MIN)
Minimum Current Sense Threshold V
FB
= V
REF
+ 20mV, Burst Disabled –25 mV
∆V
SENSE(SLEEP)
Sleep Current Sense Threshold I
TH
= 1V 50 mV
t
OFF
Switch Off Time V
FB
at Regulated Value 3 3.5 4 µs
V
FB
= 0V 70 µs
V
MODE
Mode Pin Threshold V
MODE
Rising ● 0.5 1.3 2 V
LTKD
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
*RUN/SS and SENSE cannot exceed 20V.