LM27313XMF datasheet(3/20 Pages) TI

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LM27313

www.ti.com

SNVS487D – DECEMBER 2006 – REVISED APRIL 2013

Operating Ratings

VIN

2.7V to 14V

VSW(MAX)

30V

VSHDN

0V to VIN

Junction Temperature, TJ

(1)

-40°C to 125°C

θJ-A (SOT-23-5)

265°C/W

(1)

The maximum power dissipation which can be safely dissipated for any application is a function of the maximum junction temperature,

TJ(MAX) = 125°C, the junction-to-ambient thermal resistance for the SOT-23 package, θJ-A = 265°C/W, and the ambient temperature, TA.

The maximum allowable power dissipation at any ambient temperature for designs using this device can be calculated using the

formula:

If power dissipation exceeds the maximum specified above, the internal thermal protection circuitry will protect the device by reducing

the output voltage as required to maintain a safe junction temperature.

Electrical Characteristics

Unless otherwise specified: VIN = 5V, VSHDN = 5V, IL = 0 mA, and TJ = 25°C. Limits in standard typeface are for TJ = 25°C, and

limits in boldface type apply over the full operating temperature range (

−40°C ≤ TJ ≤ +125°C). Minimum and Maximum limits

are ensured through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ =

25°C, and are provided for reference purposes only.

Symbol

Parameter

Conditions

Min

Typical

Max

Units

VIN

Input Voltage

2.7

ISW

Switch Current Limit

See(1)

0.80

1.25

RDS(ON)

Switch ON Resistance

ISW = 100 mA

500

650

Ω

Device ON

1.5

VSHDN(TH)

Shutdown Threshold

Device OFF

0.50

VSHDN = 0

ISHDN

Shutdown Pin Bias Current

µA

VSHDN = 5V

VFB

Feedback Pin Reference Voltage

VIN = 3V

1.205

1.230

1.255

IFB

Feedback Pin Bias Current

VFB = 1.23V

VSHDN = 5V, Switching

2.1

3.0

Quiescent Current

VSHDN = 5V, Not Switching

400

500

µA

VSHDN = 0

0.024

ΔVFB/ΔVIN

FB Voltage Line Regulation

2.7V

≤ VIN ≤ 14V

0.02

%/V

fSW

Switching Frequency

1.15

1.6

1.90

MHz

DMAX

Maximum Duty Cycle

Switch Leakage

Not Switching, VSW = 5V

µA

(1)

Switch current limit is dependent on duty cycle. Limits shown are for duty cycles

≤ 50%. See Figure 15 in Application Information –

MAXIMUM SWITCH CURRENT section.

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