Datasheet

LTC3125
2
3125fa
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
V
IN
, V
OUT
Voltage ......................................... –0.3V to 6V
SW Voltage .................................................. –0.3V to 6V
SW Voltage < 100ns .................................... –0.3V to 7V
All Other Pins ............................................... –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 5) ............................................ –40°C to 125°C
Junction Temperature ........................................... 125°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
TOP VIEW
SW
V
OUT
SHDN
CS
GND
FB
PROG
V
IN
DCB PACKAGE
8-LEAD (2mm s 3mm) PLASTIC DFN
9
3
4
2
1
6
5
7
8
T
JMAX
= 125°C, θ
JA
= 64°C/W (NOTE 6)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 1.8 5.5 V
Minimum Start-Up Voltage
l
1.6 1.8 V
Output Voltage Adjust Range
l
2 5.25 V
Feedback Voltage
l
1.176 1.200 1.229 V
Feedback Input Current 150 nA
Quiescent Current—Shutdown V
SHDN
= 0V, Not Including Switch Leakage, V
OUT
= 0V 0.01 1 µA
Quiescent Current —Active Measured on V
OUT
, Nonswitching 300 500 µA
Quiescent Current—Burst V
IN
= V
OUT
= 3.3V, Measured on V
IN
, FB ≥ 1.230V,
Nonswitching
15 25 µA
N-Channel MOSFET Switch Leakage V
SW
= 5V, V
IN
= 5V 0.1 10 µA
P-Channel MOSFET Switch Leakage V
SW
= 5V, V
OUT
= 0V, V
IN
= 5V 0.1 20 µA
N-Channel MOSFET Switch On-Resistance V
OUT
= 3.3V 0.125 
P-Channel MOSFET Switch On-Resistance V
OUT
= 3.3V 0.200 
N-Channel MOSFET Current Limit
l
1.2 1.8 A
Current Limit Delay to Output (Note 3) 60 ns
Average Input Current Limit R
PROG
= 44.2k
R
PROG
= 44.2k, (Note 4)
l
475
465
500
500
525
535
mA
mA
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V, V
OUT
= 4.5V unless otherwise noted (Note 2).
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3125EDCB#PBF LTC3125EDCB#TRPBF LDGY
8-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/