LM3224 datasheet(4/18 Pages) NSC

4 / 18 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.

7.5V

SW Voltage

21V

FB Voltage (Note 2)

C Voltage (Note 3)

1.26V ± 0.3V

SHDN Voltage

7.5V

FSLCT

7.5V

Maximum Junction

Temperature

150˚C

Power Dissipation(Note 4)

Internally Limited

Lead Temperature

300˚C

Vapor Phase (60 sec.)

215˚C

Infrared (15 sec.)

220˚C

ESD Susceptibility

(Note 5)

Human Body Model

2kV

Machine Model

200V

Operating Conditions

Operating Junction

Temperature Range (Note 6)

−40˚C to +125˚C

Storage Temperature

−65˚C to +150˚C

Supply Voltage

2.7V to 7V

Maximum Output Voltage

20V

Electrical Characteristics

Specifications in standard type face are for T

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

ture Range (T

J = −40˚C to +125˚C). VIN = 2.7V, FSLCT = SHDN = VIN, and IL = 0A, unless otherwise specified.

Symbol

Parameter

Conditions

Min

(Note 6)

Typ

(Note 7)

Max

(Note 6)

Units

Quiescent Current

FB = 2V (Not Switching)

1.3

2.0

SHDN = 0V

0.1

2.0

µA

Feedback Voltage

1.2285

1.26

1.2915

CL(Note 8)

Switch Current Limit

IN = 2.7V (Note 9)

1.9

2.45

2.8

IN = 3V, VOUT = 8V

2.1

IN = 3V, VOUT = 5V

2.2

FB/

∆V

Feedback Voltage Line

Regulation

2.7V

≤ V

≤ 7V

0.085

0.15

%/V

FB Pin Bias Current (Note

10)

250

SS Pin Current

7.5

µA

SS Pin Voltage

1.2090

1.2430

1.2622

Input Voltage Range

2.7

Error Amp Transconductance

∆I = 5µA

135

µmho

Error Amp Voltage Gain

V/V

MAX

Maximum Duty Cycle

92.5

Switching Frequency

FSLCT = Ground

450

615

750

kHz

FSLCT = V

0.9

1.25

1.5

MHz

SHDN

Shutdown Pin Current

SHDN = 2.7V

2.4

5.0

µA

SHDN = 0.3V

0.3

1.2

Switch Leakage Current

SW = 20V

0.2

8.0

µA

DSON

Switch R

DSON

IN = 2.7V, ISW = 1A

0.15

0.4

Ω

SHDN

Shutdown Threshold

Output High

1.2

0.8

Output Low

0.8

0.3

UVP

On Threshold

2.3

2.5

Off Threshold

2.6

2.7

Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to

be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: The FB pin should never exceed VIN.

Note 3: Under normal operation the VC pin may go to voltages above this value. This maximum rating is for the possibility of a voltage being applied to the pin,

however the VC pin should never have a voltage directly applied to it.

Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA,

and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD (MAX) = (TJ(MAX) −TA)/θJA.

Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.

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