LTC3251EMSE-1.2 datasheet(2/16 Pages) LINER

Part #	LTC3251EMSE-1.2

Description	500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3251/

LTC3251-1.2/LTC3251-1.5

32511215fa

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

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

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN Minimum Operating Voltage

(Notes 4,5)

q

2.7

V

VIN Maximum Operating Voltage

(Note 5)

q

5.5

V

VIN Continuous Mode Operating Current

IOUT = 0mA, VMD0 = 0, VMD1 = VIN

q

35

mA

Spread Spectrum Disabled MODE = VIN

q

3.75

6

mA

VIN Burst Mode Operating Current

IOUT = 0mA, VMD0 = VIN, VMD1 = 0

q

35

60

µA

Spread Spectrum Disabled MODE = VIN

q

35

60

µA

VIN Super Burst Mode Operating Current

IOUT = 0mA, VMD0 = VIN, VMD1 = VIN

q

10

15

µA

Spread Spectrum Disabled MODE = VIN

q

10

15

µA

VIN Shutdown Current

VMD0 = 0V, VMD1 = 0V (Note 5)

q

0.01

1

µA

VFB Regulation Voltage (LTC3251)

IOUT = 0mA, 2.7V ≤ VIN ≤ 5.5V

q

0.78

0.8

0.82

V

VOUT Regulation Voltage (LTC3251-1.2)

IOUT ≤ 200mA, 2.7V ≤ VIN ≤ 5.5V (Note 5)

q

1.15

1.2

1.25

V

Continuous Mode or Burst Mode Operation

IOUT ≤ 300mA, 2.8V ≤ VIN ≤ 5.5V (Note 5)

q

1.15

1.2

1.25

V

IOUT ≤ 500mA, 3V ≤ VIN ≤ 5.5V (Note 5)

1.15

1.2

1.25

V

VOUT Regulation Voltage (LTC3251-1.2)

IOUT ≤ 40mA

q

1.15

1.2

1.25

V

Super Burst Operation

VOUT Regulation Voltage (LTC3251-1.5)

IOUT ≤ 100mA, 3.1V ≤ VIN ≤ 5.5V (Note 5)

q

1.44

1.5

1.56

V

Continuous Mode or Burst Mode Operation

IOUT ≤ 200mA, 3.2V ≤ VIN ≤ 5.5V (Note 5)

q

1.44

1.5

1.56

V

IOUT ≤ 300mA, 3.3V ≤ VIN ≤ 5.5V (Note 5)

q

1.44

1.5

1.56

V

IOUT ≤ 500mA, 3.5V ≤ VIN ≤ 5.5V (Note 5)

1.44

1.5

1.56

V

VOUT Regulation Voltage (LTC3251-1.5)

IOUT ≤ 40mA

q

1.44

1.5

1.56

V

Super Burst Operation

IOUT Continuous Output Current (LTC3251)

VMD0 = 0, VMD1 = VIN or VMD0 = VIN, VMD1 = 0

q

500

mA

IOUT Super Burst Output Current (LTC3251)

VMD0 = VIN, VMD1 = VIN

q

40

mA

Load Regulation (LTC3251)

0mA

≤ IOUT ≤ 500mA, Referred to FB Pin

0.045

mV/mA

ORDER PART

NUMBER

MSE PART MARKING

EXPOSED PAD IS GND (PIN 11),

MUST BE SOLDERED TO PCB

TJMAX = 125°C, θJA = 40°C/W, θJC = 10°C/W

(Notes 1, 7)

VIN to GND ................................................... –0.3V to 6V

MD0, MD1, MODE and FB to GND . – 0.3V to (VIN + 0.3V)

IOUT (Note 2) ...................................................... 650mA

LTC3251EMSE

The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, C1 = C2 = 1µF, CIN = 1µF, COUT = 10µF,

VMODE = 0V for LTC3251-1.2V or LTC3251-1.5, VOUT = 1.5V for LTC3251, all capacitors ceramic, unless otherwise noted.

LTB4

Operating Temperature Range (Note 3) ... –40

°C to 85°C

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

°C to 150°C

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

°C

ORDER PART

NUMBER

MSE PART MARKING

EXPOSED PAD IS GND (PIN 11),

MUST BE SOLDERED TO PCB

TJMAX = 125°C, θJA = 40°C/W, θJC = 10°C/W

LTC3251EMSE-1.2

LTC3251EMSE-1.5

LTAGM

LTABE

1

2

3

4

5

MD0

VIN

C1+

C1–

GND

10

9

8

7

6

FB

MD1

C2+

VOUT

C2–

TOP VIEW

MSE PACKAGE

10-LEAD PLASTIC MSOP

11

1

2

3

4

5

MD0

VIN

C1+

C1–

GND

10

9

8

7

6

MODE

MD1

C2+

VOUT

C2–

TOP VIEW

MSE PACKAGE

10-LEAD PLASTIC MSOP

11

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