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