MIC79050 datasheet(3/20 Pages) MICREL

3 / 20 page

June 2000

MIC79050

Micrel

Electrical Characteristics

IN = VBAT + 1.0V; COUT = 4.7µF, IOUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.

Symbol

Parameter

Conditions

Min

Typical

Max

Units

BAT

Battery Voltage Accuracy

variation from nominal V

OUT –5°C to +60°C

–0.75

+0.75

∆V

BAT/∆T

Battery Voltage

Note 4

ppm/

°C

Temperature Coefficient

∆V

BAT/VBAT

Line Regulation

IN = VBAT + 1V to 16V

0.009

0.05

%/V

0.1

%/V

∆V

BAT/VBAT

Load Regulation

OUT = 100µA to 500mA, Note 5

0.05

0.5

0.7

IN – VBAT

Dropout Voltage, Note 6

OUT = 500mA

380

500

600

GND

Ground Pin Current, Notes 7, 8

EN ≥ 3.0V, IOUT = 100µA

130

µA

170

µA

EN ≥ 3.0V, IOUT = 500mA

GND

Ground Pin Quiescent Current,

EN ≤ 0.4V (shutdown)

0.05

µA

Note 8

EN ≤ 0.18V (shutdown)

0.10

µA

PSRR

Ripple Rejection

f = 120Hz

LIMIT

Current Limit

BAT = 0V

750

900

1000

∆V

BAT/∆PD

Thermal Regulation

Note 9

0.05

%/W

ENABLE Input

ENL

Enable Input Logic-Low Voltage

EN = logic low (shutdown)

0.4

0.18

EN = logic high (enabled)

2.0

ENL

Enable Input Current

ENL ≤ 0.4V (shutdown)

0.01

–1

µA

ENL ≤ 0.18V (shutdown)

0.01

–2

µA

ENH

ENH ≥ 2.0V (enabled)

µA

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

The device is not guaranteed to function outside its operating rating.

Note 3.

The maximum allowable power dissipation at any T

A (ambient temperature) is calculated using: PD(max) = (TJ(max) – TA) ÷ θJA. Exceeding the

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

Note 4.

Battery voltage temperature coefficient is the worst case voltage change divided by the total temperature range.

Note 5.

Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load

range from 100

µA to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.

Note 6.

Dropout voltage is defined as the input to battery output differential at which the battery voltage drops 2% below its nominal value measured at

1V differential.

Note 7:

Ground pin current is the charger quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the

load current plus the ground pin current.

Absolute Maximum Ratings (Note 1)

Supply Input Voltage (V

IN) ............................ –20V to +20V

Power Dissipation (P

D) ............... Internally Limited, Note 3

Junction Temperature (T

J) ....................... –40°C to +125°C

Lead Temperature (soldering, 5 sec.) ....................... 260

°C

Storage Temperature (T

S) ....................... –65°C to +150°C

Operating Ratings (Note 2)

Supply Input Voltage (V

IN) ........................... +2.5V to +16V

Enable Input Voltage (V

EN) .................................. 0V to VIN

Junction Temperature (T

J) ....................... –40°C to +125°C

Package Thermal Resistance (Note 3) ...............................

MSOP-8 (

JA) ...................................................... 80°C/W

SOP-8(

JA) .......................................................... 63°C/W

SOT-223(

JC) ...................................................... 15°C/W

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