Datasheet

LTC3458L
2
3458lfa
V
IN
, SS, SYNC Voltages ................................. –0.3 to 7V
BURST, SHDN, V
OUT
Voltages ....................... –0.3 to 7V
Operating Temperature Range
(Notes 2, 3) .........................................–40°C to 85°C
Storage Temperature Range ..................–65°C to 125°C
SW Voltage
DC ........................................................... –0.3V to 7V
Pulsed <100ns ........................................ –0.3V to 8V
ABSOLUTE AXI U RATI GS
W
WW
U
(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
= 3.3V, V
OUT
= 5V, R
T
= 200k, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum V
IN
Operating Voltage T
A
= 0°C to 85°C 1.4 1.5 V
T
A
= –40°C to 0°C 1.4 1.7 V
Output Voltage Adjust Range ● 26V
Feedback Voltage 0°C to 85°C, V
OUT
= 3.3V 1.21 1.225 1.25 V
–40°C to 0°C 1.20 1.25 V
Undervoltage (Exit Burst Mode Operation) Below Feedback Voltage –4 %
Feedback Input Current V
FB
= 1.23V 1 50 nA
Quiescent Current – Burst Mode Operation V
IN
Current at 3.3V 12 30 μA
V
OUT
Current at 5V 5 10 μA
Quiescent Current – Shutdown V
IN
Current at 3.3V 0.5 1 μA
V
OUT
Current at 0V 1 3 μA
Quiescent Current – Active V
IN
Current Switching 1 3 mA
NMOS Switch Leakage ● 0.05 5 μA
PMOS Switch Leakage ● 0.05 5 μA
NMOS Switch On Resistance V
OUT
= 5V 0.2 Ω
PMOS Switch On Resistance V
OUT
= 5V 0.3 Ω
Fixed NMOS Current Limit R
ILIM
= 84.5k ● 1.7 2.1 A
Maximum Duty Cycle V
IN
= 3.3V, f
OSC
= 1MHz ● 80 90 %
Minimum Duty Cycle ● 0%
Frequency Accuracy R
T
= 200k ● 0.85 1 1.15 MHz
Error Amplifier Transconductance 60 μA/V
Error Amplifier Source Current 7 μA
T
JMAX
= 125°C, θ
JA
= 45°C/W
12
11
10
9
8
7
1
2
3
4
5
6
V
OUT
BURST
SS
GND
COMP
FB
SW
V
IN
SYNC
SHDN
I
LIM
R
T
TOP VIEW
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
EXPOSED PAD IS PGND (PIN 13),
MUST BE SOLDERED TO PCB
13
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3458LEDE#PBF LTC3458LEDE#TRPBF 3458L 12-Lead (4mm x 3mm) Plastic DFN –40ºC to 85ºC
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC for information on nonstandard 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/