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LTC1622 Datasheet(PDF) 2 Page - Linear Technology

Part # LTC1622
Description  Low Input Voltage Current Mode Step-Down DC/DC Controller
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1622 Datasheet(HTML) 2 Page - Linear Technology

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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 (< 10
µs) ......................... 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
TJMAX = 125°C, θJA = 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
ITH
VFB
RUN/SS
8
7
6
5
VIN
PDRV
GND
SYNC/MODE
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 250°C/ W
LTC1622CMS8
MS8 PART MARKING
LTDB
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IVFB
Feedback Current
(Note 3) VFB = 0.8V
10
70
nA
VFB
Regulated Feedback Voltage
(Note 3) Commercial Grade
q
0.785
0.8
0.815
V
(Note 3) Industrial Grade
q
0.780
0.8
0.820
V
VOVL
Output Overvoltage Lockout
Referenced to Nominal VOUT
416
25
%
∆VOSENSE
Reference Voltage Line Regulation
VIN = 4.2V to 8.5V (Note 3)
0.04
0.08
%/V
VLOADREG
Output Voltage Load Regulation
Measured in Servo Loop; VITH = 0.2V to 0.625V
0.3
0.5
%
Measured in Servo Loop; VITH = 0.9V to 0.625V
– 0.3
– 0.5
%
IS
Input DC Supply Current
(Note 4)
Burst Mode Inhibited
VIN = 2.3V
450
µA
Sleep Mode
VITH = 0V, VSYNC/MODE = 2.4V
350
400
µA
Shutdown
VRUN/SS = 0V
15
30
µA
Shutdown
VRUN/SS = 0V, VIN = VUVLO – 0.1V
4
10
µA
VRUN/SS
RUN/SS Threshold
Commercial Grade
q
0.4
0.7
0.9
V
Industrial Grade
q
0.3
0.7
1.0
V
IRUN/SS
Soft-Start Current Source
VRUN/SS = 0V
1
2.5
5
µA
fOSC
Oscillator Frequency
VFB = 0.8V
475
550
625
kHz
VFB = 0V
75
110
140
kHz
VSYNC/MODE SYNC/MODE Threshold
VSYNC/MODE Ramping Down
1
1.5
V
VUVLO
Undervoltage Lockout
VIN Ramping Down
q
1.55
1.92
2.3
V
VIN Ramping Up
1.97
2.36
V
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
SENSE
ITH
VFB
RUN/SS
VIN
PDRV
GND
SYNC/MODE
(Note 1)
The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V


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