LTC3125_15 Datasheet, PDF (2/18 Pages) Linear Technology – 1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit

LTC3125
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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
PIN CONFIGURATION
TOP VIEW
GND 1
8 SW
FB 2
9
7 V_OUT
PROG 3
6 SHDN
V_IN 4
5 CS
DCB PACKAGE
8-LEAD (2mm s 3mm) PLASTIC DFN
T_JMAX = 125°C, θ_JA = 64°C/W (NOTE 6)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3125EDCB#PBF
LTC3125EDCB#TRPBF LDGY
8-Lead (2mm × 3mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 125°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.3V, V_OUT = 4.5V unless otherwise noted (Note 2).
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
1
50
nA
Quiescent Current—Shutdown
Quiescent Current—Active
Quiescent Current—Burst
V_SHDN = 0V, Not Including Switch Leakage, V_OUT = 0V
Measured on V_OUT, Nonswitching
V_IN = V_OUT = 3.3V, Measured on V_IN, FB ≥ 1.230V,
Nonswitching
0.01
1
μA
300
500
μA
15
25
μA
N-Channel MOSFET Switch Leakage
P-Channel MOSFET Switch Leakage
V_SW = 5V, V_IN = 5V
V_SW = 5V, V_OUT = 0V, V_IN = 5V
0.1
10
μA
0.1
20
μA
N-Channel MOSFET Switch On-Resistance
P-Channel MOSFET Switch On-Resistance
N-Channel MOSFET Current Limit
V_OUT = 3.3V
V_OUT = 3.3V
0.125
Ω
0.200
Ω
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)
475
500
525
mA
l 465
500
535
mA
3125fa
2