LM2734Z datasheet(3/9 Pages) NSC

3 / 9 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

-0.5V to 24V

SW Voltage

-0.5V to 24V

Boost Voltage

-0.5V to 30V

Boost to SW Voltage

-0.5V to 6.0V

FB Voltage

-0.5V to 3.0V

EN Voltage

-0.5V to (V

IN + 0.3V)

Junction Temperature

150˚C

ESD Susceptibility (Note 2)

2kV

Storage Temp. Range

-65˚C to 150˚C

Soldering Information

Infrared/Convection Reflow (15sec)

220˚C

Wave Soldering Lead Temp. (10sec)

260˚C

Operating Ratings (Note 1)

3V to 20V

SW Voltage

-0.5V to 20V

Boost Voltage

-0.5V to 25V

Boost to SW Voltage

1.6V to 5.5V

Junction Temperature Range

−40˚C to +125˚C

Thermal Resistance

JA (Note 3)

TSOT23–6

118˚C/W

Electrical Characteristics

Specifications with standard typeface are for T

J = 25˚C, and those in boldface type apply over the full Operating Tempera-

ture Range (T

J = -40˚C to 125˚C). VIN = 5V, VBOOST -VSW = 5V unless otherwise specified. Datasheet min/max specification

limits are guaranteed by design, test, or statistical analysis.

Symbol

Parameter

Conditions

Min

(Note 4)

Typ

(Note 5)

Max

(Note 4)

Units

Feedback Voltage

0.784

0.800

0.816

∆V

FB/

∆V

Feedback Voltage Line

Regulation

IN =3Vto20V

0.01

% / V

Feedback Input Bias Current

Sink/Source

250

UVLO

Undervoltage Lockout

IN Rising

2.74

2.90

Undervoltage Lockout

IN Falling

2.0

2.3

UVLO Hysteresis

0.30

0.44

0.62

Switching Frequency

2.2

3.0

3.6

MHz

MAX

Maximum Duty Cycle

MIN

Minimum Duty Cycle

DS(ON)

Switch ON Resistance

BOOST -VSW =3V

(TSOT Package)

300

600

Ω

BOOST -VSW =3V

(LLP Package)

340

650

Ω

Switch Current Limit

BOOST -VSW =3V

1.2

1.7

2.5

Quiescent Current

Switching

1.5

2.5

Quiescent Current (shutdown)

EN =0V

BOOST

Boost Pin Current

(Switching)

4.25

EN_TH

Shutdown Threshold Voltage

EN Falling

0.4

Enable Threshold Voltage

EN Rising

1.8

Enable Pin Current

Sink/Source

Switch Leakage

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see Electrical Characteristics.

Note 2: Human body model, 1.5k

Ω in series with 100pF.

Note 3: Thermal shutdown will occur if the junction temperature exceeds 165˚C. The maximum power dissipation is a function of TJ(MAX) , θJA and TA . The

maximum allowable power dissipation at any ambient temperature is PD =(TJ(MAX) –TA)/θJA . All numbers apply for packages soldered directly onto a 3” x 3” PC

board with 2oz. copper on 4 layers in still air. For a 2 layer board using 1 oz. copper in still air,

θJA = 204˚C/W.

Note 4: Guaranteed to National’s Average Outgoing Quality Level (AOQL).

Note 5: Typicals represent the most likely parametric norm.

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