Datasheet
LTC3442
2
3442fa
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
Operating Temperature (Note 2) ............. –40°C to 85°C
Maximum Junction Temperature (Note 4) ............ 125°C
Storage Temperature Range ................. –65°C to 125°C
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● 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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Start-Up Voltage ● 2.3 2.4 V
Output Voltage Adjust Range ● 2.4 5.25 V
Feedback Voltage ● 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 ● 23 A
Reverse Current Limit 0.5 A
Burst Mode Operation Current Limit 0.9 A
Max Duty Cycle Boost (% Switch C On) ● 70 88 %
Buck (% Switch A In)
● 100 %
Min Duty Cycle ● 0%
Frequency Accuracy ● 570 670 770 kHz
Error Amp A
VOL
90 dB
Error Amp Source Current 11 µA
Error Amp Sink Current 300 µA
Burst Threshold (Falling) 0.88 V
Burst Threshold (Rising) 1.12 V
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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 IS PGND (PIN 13), MUST BE SOLDERED TO PCB
12
11
10
9
8
7
1
2
3
4
5
6
FB
V
C
R
LIM
V
IN
V
OUT
BURST
SHDN/SS
RT
SGND
SW1
PGND
SW2
TOP VIEW
13
DE12 PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
ORDER PART NUMBER
DE PART MARKING
LTC3442EDE 3442