Datasheet

2
LTC3440
3440fb
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Start-Up Voltage ● 2.4 2.5 V
Input Operating Range ● 2.5 5.5 V
Output Voltage Adjust Range ● 2.5 5.5 V
Feedback Voltage ● 1.196 1.22 1.244 V
Feedback Input Current V
FB
= 1.22V 1 50 nA
Quiescent Current, Burst Mode Operation V
C
= 0V, MODE/SYNC = 3V (Note 3) 25 40 μA
Quiescent Current, Shutdown SHDN = 0V, Not Including Switch Leakage 0.1 1 μA
Quiescent Current, Active V
C
= 0V, MODE/SYNC = 0V (Note 3) 600 1000 μA
NMOS Switch Leakage Switches B and C 0.1 5 μA
PMOS Switch Leakage Switches A and D 0.1 10 μA
NMOS Switch On Resistance Switches B and C 0.19 Ω
PMOS Switch On Resistance Switches A and D 0.22 Ω
Input Current Limit ● 1A
Maximum Duty Cycle Boost (% Switch C On) ● 55 75 %
Buck (% Switch A On)
● 100 %
Minimum Duty Cycle ● 0%
Frequency Accuracy ● 0.8 1 1.2 MHz
MODE/SYNC Threshold 0.4 2 V
MODE/SYNC Input Current V
MODE/SYNC
= 5.5V 0.01 1 μA
(Note 1)
V
IN
, V
OUT
Voltage........................................ –0.3V to 6V
SW1, SW2 Voltage ..................................... –0.3V to 6V
V
C
, R
T
, FB, SHDN/SS,
MODE/SYNC Voltage .................................. –0.3V to 6V
ORDER PART
NUMBER
LTC3440EDD
T
JMAX
= 125°C,
θ
JA
= 130°C/ W 1 LAYER BOARD
θ
JA
= 100°C/ W 4 LAYER BOARD
θ
JC
= 45°C/ W
The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
= 3.6V, R
T
= 60k, unless otherwise noted.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
DD
PART MARKING
LBKT
1
2
3
4
5
R
T
MODE/SYNC
SW1
SW2
GND
10
9
8
7
6
V
C
FB
SHDN/SS
V
IN
V
OUT
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC3440EMS
MS
PART MARKING
LTNP
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
EXPOSED PAD (PIN 11) IS GND
MUST BE SOLDERED TO PCB
10
9
6
7
8
4
5
3
2
1
V
C
FB
SHDN/SS
V
IN
V
OUT
R
T
MODE/SYNC
SW1
SW2
GND
11
T
JMAX
= 125°C, θ
JA
= 43°C/ W, θ
JC
= 3°C/ W
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/