MIC5255 datasheet(4/11 Pages) MICREL

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MIC5255

Micrel

August, 2004

M0385-080204

Electrical Characteristics(5)

IN = VOUT + 1V, VEN = VIN; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.

Symbol

Parameter

Conditions

Min

Typical

Max

Units

Output Voltage Accuracy

OUT = 100µA

–11

–22

∆V

LNR

Line Regulation

IN = VOUT + 1V to 6V

0.02

0.05

%/V

∆V

LDR

Load Regulation

OUT = 0.1mA to 150mA

(6)

1.5

2.5

IN – VOUT

Dropout Voltage(7)

OUT = 100µA

0.1

OUT = 100mA

150

OUT = 150mA

135

200

250

Quiescent Current

EN ≤ 0.4V (shutdown)

0.2

µA

GND

Ground Pin Current(8)

OUT = 0mA

150

µA

OUT = 150mA

117

µA

PSRR

Ripple Rejection

f = 10Hz, C

OUT = 1.0µF, CBYP = 0.01µF60

f = 100Hz, V

IN = VOUT +1

f = 10kHz, V

IN = VOUT +1

LIM

Current Limit

OUT = 0V

160

425

Output Voltage Noise

OUT = 1.0µF, CBYP = 0.01µF,

µV(rms)

f = 10Hz to 100kHz

Enable Input

Enable Input Logic-Low Voltage

IN = 2.7V to 5.5V, regulator shutdown

0.4

Enable Input Logic-High Voltage

IN = 2.7V to 5.5V, regulator enabled

1.6

Enable Input Current

IL ≤ 0.4V, regulator shutdown

0.01

µA

IH ≥ 1.6V, regulator enabled

0.01

µA

Shutdown Resistance Discharge

500

Ω

Thermal Protection

Thermal Shutdown Temperature

150

°C

Thermal Shutdown Hysteresis

°C

Notes:

1. Exceeding the absolute maximum rating may damage the device.

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

3. The maximum allowable power dissipation of any T

A (ambient temperature) is 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. The

JA of the MIC5255-x.xBM5 (all

versions) is 235

°C/W on a PC board. See “Thermal Considerations” section for further details.

4. Devices are ESD sensitive. Handling precautions recommended.

5. Specification for packaged product only.

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

from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.

7. Dropout Voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differen-

tial. For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating

voltage is 2.7V.

8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current.

Absolute Maximum Ratings(1)

Supply Input Voltage (V

IN) .................................. 0V to +7V

Enable Input Voltage (V

EN) ................................. 0V to +7V

Power Dissipation (P

D) ........................ Internally Limited

(3)

Junction Temperature (T

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

Storage Temperature (T

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

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

°C

ESD(4) .............................................................................................. 2kV

Operating Ratings(2)

Input Voltage (V

IN) ......................................... +2.7V to +6V

Enable Input Voltage (V

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

Junction Temperature (T

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

Thermal Resistance

SOT-23

(θ

JA) ..................................................... 235°C/W

×2 MLF™ (θ

JA) .................................................. 90°C/W

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