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LTC3421

3421f

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum VIN Start-Up Voltage

ILOAD < 1mA

0.88

Minimum VIN Operating Voltage

(Note 4)

0.5

Output Voltage Adjust Range

2.25

5.25

2.40

5.25

Feedback Voltage

1.196

1.220

1.244

Feedback Input Current

VFB = 1.22V

Quiescent Current—Burst Mode Operation

VC = 0V, ENB = 0V (Note 3)

µA

VC = 0V, ENB = 2V (Note 3)

µA

Quiescent Current—Shutdown

SHDN = 0V, ENB = 0V

0.1

µA

SHDN = 0V, ENB > 1.4V

0.2

µA

Quiescent Current—Active

(Note 3)

0.6

1.1

NMOS Switch Leakage

0.1

µA

PMOS Switch Leakage

0.1

µA

NMOS Switch On Resistance

0.1

Ω

PMOS Switch On Resistance

0.14

Ω

NMOS Current Limit

ILIM Resistor = 105k

1.5

ILIM Resistor = 36.5k

4.2

Max Duty Cycle

Min Duty Cycle

VIN, VOUT, VOUTS Voltage ............................ – 0.3V to 6V

BURST, SHDN, SS, ENB, SW,

LBO, LBI, SYNC Voltages .......................... – 0.3V to 6V

Operating Temperature Range

(Notes 2, 5) ............................................. –40

°C to 85°C

Storage Temperature Range ................. – 65

°C to 125°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

ORDER PART NUMBER

Consult LTC Marketing for parts specified with wider operating temperature ranges.

LTC3421EUF

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

TJMAX = 125°C, θJA = 40°C/W 1 LAYER BOARD,

θJA = 35°C/W 4 LAYER BOARD, θJC = 2.6°C/W

EXPOSED PAD IS GND (PIN 25) MUST BE SOLDERED TO PCB

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V, RT = 28k, unless otherwise noted.

24 23 22 21 20 19

TOP VIEW

UF PACKAGE

24-LEAD (4mm

× 4mm) PLASTIC QFN

10 11 12

SHDN

VREF

ENB

VOUTS

VOUT

PGND

UF PART MARKING

3421

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