Datasheet

2
LTC1622
ABSOLUTE MAXIMUM RATINGS
W
WW
U
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
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
PACKAGE/ORDER INFORMATION
W
U
U
T
JMAX
= 125°C, θ
JA
= 150°C/ W
S8 PART MARKING
ORDER PART
NUMBER
LTC1622CS8
LTC1622IS8
1622
1622I
ORDER PART
NUMBER
Consult factory for Military grade parts.
1
2
3
4
SENSE
–
I
TH
V
FB
RUN/SS
8
7
6
5
V
IN
PDRV
GND
SYNC/MODE
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 250°C/W
LTC1622CMS8
MS8 PART MARKING
LTDB
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current (Note 3) V
FB
= 0.8V 10 70 nA
V
FB
Regulated Feedback Voltage (Note 3) Commercial Grade ● 0.785 0.8 0.815 V
(Note 3) Industrial Grade
● 0.780 0.8 0.820 V
V
OVL
Output Overvoltage Lockout Referenced to Nominal V
OUT
41625 %
∆V
OSENSE
Reference Voltage Line Regulation V
IN
= 4.2V to 8.5V (Note 3) 0.04 0.08 %/V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop; V
ITH
= 0.2V to 0.625V 0.3 0.5 %
Measured in Servo Loop; V
ITH
= 0.9V to 0.625V –0.3 –0.5 %
I
S
Input DC Supply Current (Note 4)
Burst Mode Inhibited V
IN
= 2.3V 450 µA
Sleep Mode V
ITH
= 0V, V
SYNC/MODE
= 2.4V 350 400 µA
Shutdown V
RUN/SS
= 0V 15 30 µA
Shutdown V
RUN/SS
= 0V, V
IN
= V
UVLO
– 0.1V 4 10 µA
V
RUN/SS
RUN/SS Threshold Commercial Grade ● 0.4 0.7 0.9 V
Industrial Grade
● 0.3 0.7 1.0 V
I
RUN/SS
Soft-Start Current Source V
RUN/SS
= 0V 1 2.5 5 µA
f
OSC
Oscillator Frequency V
FB
= 0.8V 475 550 625 kHz
V
FB
= 0V 75 110 140 kHz
V
SYNC/MODE
SYNC/MODE Threshold V
SYNC/MODE
Ramping Down 1 1.5 V
V
UVLO
Undervoltage Lockout V
IN
Ramping Down ● 1.55 1.92 2.3 V
V
IN
Ramping Up 1.97 2.36 V
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
SENSE
–
I
TH
V
FB
RUN/SS
V
IN
PDRV
GND
SYNC/MODE
(Note 1)
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V