Datasheet

LTC3442
2
3442fb
For more information www.linear.com/LTC3442
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN
, V
OUT
Voltage ............................................– 0.3 to 6V
SW1, SW2 Voltage
DC ............................................................... –0.3 to 6V
Pulsed <100ns
.................................................–0.3 to 7V
SHDN/SS, BURST Voltage
............................... –0.3 to 6V
R
LIM
...........................................................................V
IN
Operating Temperature (Note 2) ................–40°C to 85°C
Maximum Junction Temperature (Note 4)
.............. 125°C
Storage Temperature Range
....................–65°C to 125°C
(Notes 1, 4)
12
11
10
9
8
7
1
2
3
4
5
6
FB
V
C
R
LIM
V
IN
V
OUT
BURST
SHDN/SS
R
T
SGND
SW1
PGND
SW2
TOP VIEW
13
PGND
DE12 PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
= 125°C, θ
JA
= 53°C/W 1-LAYER BOARD
θ
JA
= 43°C/W 4-LAYER BOARD, θ
JC
= 4.3°C/W
EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3442EDE#PBF LTC3442EDE#TRPBF 3442
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
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/
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
= 3.6V, R
T
= 64.9k, unless otherwise noted (Note 2).
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Start-Up Voltage
l
2.3 2.4 V
Output Voltage Adjust Range
l
2.4 5.25 V
Feedback Voltage
l
1.19 1.22 1.25 V
Feedback Input Current V
FB
= 1.22V 1 50 nA
Quiescent Current – Burst Mode Operation V
FB
= 1.22V, BURST = 0V (Note 3) 35 60 µA
Quiescent Current – Shutdown SHDN = 0V, V
OUT
= 0V, Not Including Switch Leakage 0.1 1 µA
Quiescent Current – Active BURST = V
IN
(Note 3) 600 1100 µA
NMOS Switch Leakage Switches B and C 0.1 2
µA
PMOS Switch Leakage Switches A and D 0.1 3 µA
NMOS Switch On Resistance Switches B and C 0.10 Ω
PMOS Switch On Resistance Switches A and D 0.10 Ω
Input Current Limit
l
2 3 A
Reverse Current Limit 0.5 A
Burst Mode Operation Current Limit 0.9 A
Max Duty Cycle Boost (% Switch C On)
Buck (% Switch A In)
l
l
70
100
88 %
%
Min Duty Cycle
l
0 %
Frequency Accuracy
l
570 670 770 kHz
Error Amp A
VOL
90 dB
Error Amp Source Current BURST > 1.25V 11 µA