If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

SW Pin Voltage

−0.5 V to 14.5V

BOOT, V

−0.5V to 10V

FREQ Pin

100µA

θ

240˚C/W

T

150˚C

Storage Temperature Range

−65˚C to +150˚C

Lead Temp. (Soldering, 5 sec)

260˚C

Power Dissipation (T

(Note 2)

500mW

ESD Rating (Note 3)

2kV

V

2.5V to 5V

FB, EN Pins

0 to V

DD

BOOT Pin

0 to 10V

Ambient Temperature (T

−40˚C to +85˚C

Electrical Characteristics

Limits in standard typeface are for T

−40˚C to +85˚C. Unless otherwise specified: V

Symbol

Parameter

Condition

Typ

Min

Max

Units

V

IN_ST

Minimum Start-Up Supply

Voltage (Note 4)

I

1.1

1.2

V

V

IN_OP

Minimum Operating Supply

Voltage (once started)

I

0.65

V

V

FB

FB Pin Voltage

1.24

1.2028

1.2772

V

V

OUT_MAX

Maximum Output Voltage

14

V

V

HYST

Hysteresis Voltage (Note 7)

30

45

mV

η

Efficiency

V

= 500mA

87

%

V

= 200mA

87

D

Switch Duty Cycle

70

60

80

%

I

DD

Operating Quiescent Current

(Note 6)

DD

80

110

µA

I

SD

Shutdown Quiescent Current

(Note 7)

V

0.01

2.5

µA

I

CL

Switch Peak Current Limit

2.85

A

R

DS_ON

MOSFET Switch On

Resistance

0.17

Ω

Enable Section

V

EN_LO

EN Pin Voltage Low (Note 8)

0.15V

DD

V

V

EN_HI

EN Pin Voltage High (Note 8)

0.7V

DD

V

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device

outside of its rated operating conditions.

given in the Absolute Maximum Ratings, whichever is lower.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. For Pin 8 (SW) the ESD rating is 1.5 kV.

Note 5: This is the hysteresis value of the internal comparator used for the gated-oscillator control scheme.

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