Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

IN

-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

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)

V

IN

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

θ

JA (Note 3)

118˚C/W

Electrical Characteristics

Specifications with standard typeface are for T

ture Range (T

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

Symbol

Parameter

Conditions

Min

(Note 4)

Typ

(Note 5)

Max

(Note 4)

Units

V

FB

Feedback Voltage

0.784

0.800

0.816

V

∆V

∆V

IN

Feedback Voltage Line

Regulation

V

0.01

% / V

I

FB

Feedback Input Bias Current

Sink/Source

10

250

nA

UVLO

Undervoltage Lockout

V

2.74

2.90

V

Undervoltage Lockout

V

2.0

2.3

UVLO Hysteresis

0.30

0.44

0.62

F

SW

Switching Frequency

LM2734X

1.2

1.6

1.9

MHz

LM2734Y

0.40

0.55

0.66

D

MAX

Maximum Duty Cycle

LM2734X

85

92

%

LM2734Y

90

96

D

MIN

Minimum Duty Cycle

LM2734X

2

%

LM2734Y

1

R

DS(ON)

Switch ON Resistance

V

300

600

m

Ω

I

CL

Switch Current Limit

V

1.2

1.7

2.5

A

I

Q

Quiescent Current

Switching

1.5

2.5

mA

Quiescent Current (shutdown)

V

30

nA

I

BOOST

Boost Pin Current

LM2734X (50% Duty Cycle)

2.5

3.5

mA

LM2734Y (50% Duty Cycle)

1.0

1.8

V

EN_TH

Shutdown Threshold Voltage

V

0.4

V

Enable Threshold Voltage

V

1.8

I

EN

Enable Pin Current

Sink/Source

10

nA

I

SW

Switch Leakage

40

nA

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.

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

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

Note 5: Typicals represent the most likely parametric norm.

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