LTC1622
ABSOLUTE
MAXIMUM
RATINGS
Input Supply Voltage (V
IN
).........................– 0.3V to 10V
RUN/SS Voltage .......................................– 0.3V to 2.4V
SYNC/MODE Voltage ................................. – 0.3V to V
IN
SENSE
–
Voltage .......................................... 2.4V to V
IN
PDRV Peak Output Current (< 10µs) ......................... 1A
Storage Ambient Temperature Range ... – 65°C to 150°C
PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
SENSE
–
1
I
TH
2
V
FB
3
RUN/SS 4
8
7
6
5
V
IN
PDRV
GND
SYNC/MODE
TOP VIEW
SENSE
–
1
I
TH
2
V
FB
3
8
7
6
5
V
IN
PDRV
GND
SYNC/MODE
LTC1622CMS8
MS8 PART MARKING
LTDB
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 250°C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL
I
VFB
V
FB
V
OVL
∆V
OSENSE
V
LOADREG
I
S
PARAMETER
Feedback Current
Regulated Feedback Voltage
Output Overvoltage Lockout
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input DC Supply Current
Burst Mode Inhibited
Sleep Mode
Shutdown
Shutdown
RUN/SS Threshold
Soft-Start Current Source
Oscillator Frequency
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V
CONDITIONS
(Note 3) V
FB
= 0.8V
(Note 3) Commercial Grade
(Note 3) Industrial Grade
Referenced to Nominal V
OUT
V
IN
= 4.2V to 8.5V (Note 3)
Measured in Servo Loop; V
ITH
= 0.2V to 0.625V
Measured in Servo Loop; V
ITH
= 0.9V to 0.625V
(Note 4)
V
IN
= 2.3V
V
ITH
= 0V, V
SYNC/MODE
= 2.4V
V
RUN/SS
= 0V
V
RUN/SS
= 0V, V
IN
= V
UVLO
– 0.1V
Commercial Grade
Industrial Grade
V
RUN/SS
= 0V
V
FB
= 0.8V
V
FB
= 0V
V
SYNC/MODE
Ramping Down
V
IN
Ramping Down
V
IN
Ramping Up
q
q
q
q
q
V
RUN/SS
I
RUN/SS
f
OSC
V
SYNC/MODE
SYNC/MODE Threshold
V
UVLO
Undervoltage Lockout
2
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range
Commercial ............................................ 0°C to 70°C
Industrial ........................................... – 45°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC1622CS8
LTC1622IS8
S8 PART MARKING
1622
1622I
RUN/SS 4
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 150°C/ W
MIN
0.785
0.780
4
TYP
10
0.8
0.8
7.5
0.04
0.3
– 0.3
450
350
15
4
MAX
70
0.815
0.820
10.5
0.08
0.5
– 0.5
UNITS
nA
V
V
%
%/V
%
%
µA
µA
µA
µA
V
V
µA
kHz
kHz
V
V
V
400
30
10
0.9
1.0
5
625
140
1.5
2.3
2.36
0.4
0.3
1
475
75
1.55
0.7
0.7
2.5
550
110
1
1.92
1.97
LINER [ LINEAR TECHNOLOGY ]
