LM27966 datasheet(3/13 Pages) NSC

3 / 13 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 6.0V

SCL, SDIO, VIO, RESET 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)

(Note 4)

ESD Rating(Note 5)

Human Body Model

2.0kV

Operating Rating (Notes 1, 2)

Input Voltage Range

2.7V to 5.5V

LED Voltage Range

2.0V to 4.0V

Junction Temperature (T

J) Range

-30˚C to +100˚C

Ambient Temperature (T

Range(Note 6)

-30˚C to +85˚C

Thermal Properties

Juntion-to-Ambient Thermal

Resistance (

JA), SQA24A Package

(Note 7)

41.3˚C/W

ESD Caution Notice National Semiconduc-

tor recommends that all integrated circuits be handled with

appropriate ESD precautions. Failure to observe proper

ESD handling techniques can result in damage to the

device.

Electrical Characteristics (Notes 2, 8)

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; VRESET =VIN; VIO = 1.8V VDx = 0.4V; VDAUX = 0.4V; RSET = 16.9kΩ;Dx =DAUX =

Fullscale Current; EN-MAIN, EN-D5 Bits = “1”; C1=C2=1.0µF, C

IN=COUT=1.0µF; Specifications related to output current(s) and

current setting pins (I

Dx and ISET) apply to Main Display and Auxiliary LED. (Note 9)

Symbol

Parameter

Condition

Min

Typ

Max

Units

Output Current Regulation

Main Display or Auxiliary LED

Enabled

3.0V

≤ V

≤ 5.5V

EN-AUX= ’0’

18.2

(-9.5%)

20.1

22.0

(+9.5%)

(%)

3.0V

≤ V

≤ 5.5V

EN-AUX = ’1’ and EN-MAIN = EN-D5 = ’0’

19.2

(-7.7%)

20.8

22.4

(+7.7%)

(%)

Maximum Output Current

Regulation

Main Display and Auxiliary LED

Enabled

(Note 10)

3.2V

≤ V

≤ 5.5V

SET = 8.33k

Ω

LED = 3.6V

EN-MAIN = EN-D5 = EN-AUX = “1”

AUX

Dx-MATCH

LED Current Matching

(Note 11)

0.3

1.7

OUT

Open-Loop Charge Pump Output

Resistance

Gain = 3/2

2.75

Ω

Gain = 1

DxTH

Dx 1x to 3/2x Gain Transition

Threshold

Dx Falling

RSET = 16.9k

Ω

175

Current Source Headroom Voltage

Requirement

(Note 12)

Dxx = 95% xIDxx (nom.)

Dxx (nom)

≈ 15mA)

Gain = 3/2

EN-MAIN = EN-D5 and/or EN-AUX= "1"

110

Quiescent Supply Current

Gain = 1.5x, No Load

2.90

3.32

Shutdown Supply Current

All EN-x bits = "0"

3.4

5.4

µA

SET

SET Pin Voltage

2.7V

≤ V

≤ 5.5V

1.25

Dx/

SET

Output Current to Current Set

Ratio Main Display, DAUX

200

Switching Frequency

0.89

1.27

1.57

MHz

START

Start-up Time

OUT = 90% steady state

250

µs

PWM

Internal Diode Current PWM

Frequency

kHz

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