LP3906 datasheet(7/47 Pages) TI

7 / 47 page

LP3906

www.ti.com

SNVS456M – AUGUST 2006 – REVISED MAY 2013

OPERATING RATINGS

(1) (2) (3)

Bucks

VIN

2.7V to 5.5V

VEN

0 to (VIN + 0.3V)

Junction Temperature (TJ) Range

−40°C to +125°C

Ambient Temperature (TA) Range

(4)

−40°C to +85°C

Thermal Properties(5)(6) (4)

Junction-to-Ambient Thermal Resistance

(

θJA)NHZ0024B

28°C/W

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under

which operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits

and associated test conditions, see the Electrical Characteristics.

(2)

All voltages are with respect to the potential at the GND pin.

(3)

Min and Max limits are ensured by design, test, or statistical analysis. Typical numbers are not specifications, but do represent the most

likely norm.

(4)

Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power

dissipation exists, special care must be paid to thermal dissipation issues in board design.

(5)

Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ = 160°C (typ.) and

disengages at TJ = 140°C (typ.)

(6)

In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may

have to be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP =

125°C), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to-ambient thermal resistance of the

part/package in the application (

θJA), as given by the following equation: TA-MAX = TJ-MAX-OP − (θJA × PD-MAX). See APPLICATION

NOTES.

GENERAL ELECTRICAL CHARACTERISTICS

(1) (2) (3) (4)

Unless otherwise noted, VIN = 3.6V, Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing

in boldface type apply over the entire junction temperature range for operation,

−40°C to +125°C.

Parameter

Test Conditions

Min

Typ

Max

Units

VPOR

Power-On Reset Threshold

VDD Falling Edge

1.9

TSD

Thermal Shutdown Threshold

160

°C

TSDH

Themal Shutdown Hysteresis

°C

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under

which operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits

and associated test conditions, see the Electrical Characteristics.

(2)

All voltages are with respect to the potential at the GND pin.

(3)

Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not specified, but do represent the most

likely norm.

(4)

This specification is ensured by design.

2C COMPATIBLE INTERFACE ELECTRICAL SPECIFICATIONS(1)

Unless otherwise noted, VIN = 3.6V. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing

in boldface type apply over the entire junction temperature range for operation,

−40°C to +125°C

Parameter

Test Conditions

Min

Typ

Max

Units

FCLK

Clock Frequency

400

kHz

tBF

Bus-Free Time Between Start and Stop

See(1)

1.3

µs

tHOLD

Hold Time Repeated Start Condition

See(1)

0.6

µs

tCLKLP

CLK Low Period

See(1)

1.3

µs

tCLKHP

CLK High Period

See(1)

0.6

µs

tSU

Set Up Time Repeated Start Condition

See(1)

0.6

µs

tDATAHLD

Data Hold time

See(1)

µs

tDATASU

Data Set Up Time

See(1)

100

TSU

Set Up Time for Start Condition

See(1)

0.6

µs

TTRANS

Maximum Pulse Width of Spikes that

See(1)

Must be Suppressed by the Input Filter of

Both DATA & CLK Signals.

(1)

This specification is ensured by design.

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