Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Unless otherwise specified,

voltages are from the indicated

pins to GND.

VIN, CS+, CS-, SW

-0.3V to +22V

VDD, PGOOD

-0.3V to +6V

EN, SYNC, SS/TRACK, FADJ,

COMP, FB, LG

-0.3V to VDD

CBOOT

-0.3V to +24V

CBOOT to SW

+6V

CS+ to CS-

-2V to +2V

Storage Temperature

-65°C to 150°C

Junction Temperature

150°C

Lead Temperature

(Soldering, 10 sec)

260°C

Minimum ESD Rating (Note 2)

±2kV

Input Voltage Range (Note 3)

VIN

+3.0V to +20V

VIN (VDD = VIN)

+3.0V to +5.5V

VDD to GND

+2.2V to +5.5V

SS/TRACK, SYNC, EN

0V to V

VDD

PGOOD

0V to +5.5V

Junction Temperature

-40°C to + 125°C

θ

40°C/W

θ

40°C/W

type are for T

and maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely

parametric norm at T

System Parameters

Symbol

Parameter

Conditions

Min

Typ

Max

Units

OPERATIONAL SPECIFICATIONS

I

Q

Quiescent Current

V

4.5

6.0

mA

I

QSD

Quiescent Current In Shutdown

V

25

45

µA

UVLO

UVLO

Input Under Voltage Lockout

V

2.7

2.9

2.99

V

UVLO

HYS

UVLO Hysteresis

V

300

mV

REFERENCE

V

FB

Feedback Voltage

0.594

0.600

0.606

V

I

FB

Feedback Pin Bias Current

V

-50

0

50

nA

SWITCHING

F

SW

Switching Frequency

R

950

1150

1350

kHz

F

SW

Switching Frequency

R

400

500

600

kHz

F

SW

Switching Frequency

R

175

214

265

kHz

D

MAX

Maximum Duty Cycle

F

93

95

%

T

OFF_MIN

Minimum Off Time

V

125

165

205

ns

VDD SUB-REGULATOR

V

DD

Sub-Regulator Output Voltage

I

4.0

4.5

5.0

V

ERROR AMPLIFIER

B

W-3db

Open Loop Bandwidth

2

MHz

A

VOL

Error Amp DC Gain

50

dB

V

SLEW_RISE

Error Amplifier Rising Slew Rate

V

5

V/µs

V

SLEW_FALL

Error Amplifier Falling Slew Rate

V

3

V/µs

I

SOURCE

COMP Source Current

V

8

12

mA

I

SINK

COMP Sink Current

V

4

12

mA

V

COMP_MAX

Max COMP Voltage

V

3.1

V

V

COMP_MIN

Min COMP Voltage

V

0.5

V

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