LM27953 datasheet(3/11 Pages) NSC

3 / 11 page

Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

IN pin voltage

-0.3V to 7.1V

EN pin voltages

-0.3V to (V

IN+0.3V)

w/ 6.0V max

Dx Pin Voltages

-0.3V to

POUT+0.3V)

w/ 6.0V max

Continuous Power Dissipation

(Note 3)

Internally Limited

Junction Temperature (T

J-MAX)

150oC

Storage Temperature Range

-65oC to +150o C

Maximum Lead Temperature

(Soldering, 10 sec.)

265oC

ESD Rating (Note 4)

Human Body Model - I

Dx Pins:

Human Body Model - All other Pins:

Machine Model - I

Dx Pins:

Machine Model - All Other Pins:

1.0kV

2.0kV

100V

200V

Operating Rating (Notes 1, 2)

Input Voltage Range

2.7V to 5.5V

Junction Temperature (T

J) Range

-30˚C to +125˚C

Ambient Temperature (T

A) Range

(Note 5)

-30˚C to +85˚C

Thermal Properties

Juntion-to-Ambient Thermal

Resistance (

JA), (Note 6)

100˚C/W

Electrical Characteristics (Notes 2, 7)

Limits in standard typeface are for T

J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-

less otherwise specified: V

IN = 3.6V; VDx = 0.6V; EN = 1.5V; RSET = 8.35k

Ω;C

IN,C1,C2 , and CPOUT = 1µF. (Note 8)

Symbol

Parameter

Condition

Min

Typ

Max

Units

Output Current Regulation

3.0V

≤ V

≤ 4.2V, and V

IN = 5.5V

0.45V

≤ V

≤ 3.8V

SET = 8.35k

Ω

13.5

(-10%)

16.5

(+10%)

(%)

3.0V

≤ V

≤ 5.5V;

0.6V

≤ V

≤ 3.8V

SET = 6.25k

Ω

3.0V

≤ V

≤ 5.5V;

0.3V

≤ V

≤ 3.8V

SET = 12.5k

Ω

2.7V

≤ V

≤ 3.0V;

0.45V

≤ V

≤ 3.8V

SET = 8.35k

Ω

Dx-MATCH

Current Matching Between

Outputs

IN = 3.0V (Note 9)

0.6

Quiescent Supply Current

2.7V

≤ V

≤ 4.2V;

No Load Current,

EN=ON

4.4

6.75

Shutdown Supply Current

2.7V

≤ V

≤ 5.5V,

ENA OFF

2.3

µA

SET

SET Pin Voltage

2.7V

≤ V

≤ 5.5V

1.25

Dx/ISET

Output Current to Current Set

Ratio

100

OUT

Charge Pump Output Resistance

(Note 10)

IN = 3.0V

2.7

Ω

Current Source Headroom

Voltage Requirement (Note 11)

Dx =95%XIDx (nom)

SET = 8.35k

Ω

Dx (nom)

≈ 15mA)

320

Switching Frequency

3.0V

≤ V

≤ 4.2V

375

500

625

kHz

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