MICREL MIC5270-5.0BM5, MIC5270-3.0BM5, MIC5270-4.1BM5 Datasheet

MIC5270 Micrel

MIC5270

IttyBitty™ Negative Low-Dropout Regulator

Preliminary Information

General Description

The MIC5270 is a µCap 100mA negative regulator in a SOT­23-5 package. With better than 2% initial accuracy, this
regulator provides a very accurate supply voltage for applica­tions that require a negative rail. The MIC5270 sinks 100mA
of output current at very low dropout voltage (600mV maxi­mum at 100mA of output current).

The µCap regulator design is optimized to work with low­value, low-cost ceramic capacitors. The output typically re­quires only a 1µF capacitance for stability.

Designed for applications where small packaging and effi­ciency are critical, the MIC5270 combines LDO design exper­tise with IttyBitty™ packaging to improve performance and
reduce power dissipation. Ground current is optimized to help
improve battery life in portable applications.

The MIC5270 is available in the SOT-23-5 package for space
saving applications and it is available with fixed –3.0V, –4.1V,
and –5.0V outputs.

Ordering Information

Part Number Voltage Temperature Range Package

MIC5270-3.0BM5 –3.0V –40°C to +85°C SOT-23-5
MIC5270-4.1BM5 –4.1V –40°C to +85°C SOT-23-5
MIC5270-5.0BM5 –5.0V –40°C to +85°C SOT-23-5

Features

• IttyBitty™ SOT-23-5 packaging

• Low dropout voltage

• Low ground current

• Tight initial accuracy

• Tight load and line regulation

• Thermal shutdown

• Current limiting

• Stable with low-ESR ceramic capacitors

Applications

• GaAsFET bias

• Portable cameras and video recorders

• PDAs

• Battery-powered equipment

Typical Application

MIC5270-5.0

2

V

IN

GND

54

–OUT–IN

1µF 10µF

V

OUT

–5.0V–6.0V

Pin Description

Pin Number Pin Name Pin Function

1 NC Not internally connected.
2 GND Ground
3 NC Not internally connected.
4 –OUT Negative Regulator Output
5 –IN Negative Supply Input

IttyBitty is a trademark of Micrel, Inc.

Pin Configuration

NC

MIC5270-x.xBM5

NC

GND

13

2

LLxx

45

–IN–OUT

March 1999 283 MIC5270

MIC5270 Micrel

Absolute Maximum Ratings (Note 1)

Input Voltage (V

Power Dissipation (PD) ............................ Internally Limited

Junction Temperature (TJ) ....................... –40°C to +125°C

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

–IN

Operating Ratings (Note 2)

Input Voltage (VIN) .......................................... –16V to –2V

Junction Temperature (TJ) ....................... –40°C to +125°C

Thermal Resistance (θJA)......................................... Note 4

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

Storage Temperature (TS) ....................... –65°C to +150°C

ESD Rating, Note 3

Electrical Characteristics

VIN = V

Symbol Parameter Condition Min Typ Max Units

V

OUT

∆V

OUT

∆V

OUT/VOUT

∆V

OUT/VOUT

VIN – V

I

GND

PSRR Ripple Rejection f = 120Hz 50 dB
I

LIMIT

∆V

OUT

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. Devices are ESD sensitive. Handling precautions recommended.
Note 4. The maximum allowable power dissipation is a function of the maximum junction temperature, T

Note 5. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load

Note 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

Note 8. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of

Note 9. Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line

– 1.0V; C

OUT

Output Voltage Accuracy Variation from nominal V

= 4.7µF, I

OUT

= 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.

OUT

OUT

–2 2 %
–3 3 %

/∆T Output Voltage Temperature Note 5 100 ppm/°C

Coefficient
Line Regulation VIN = V
Load Regulation I

OUT

Dropout Voltage, Note 7 I

Ground Current, Note 8 I

Current Limit V

/∆P

Thermal Regulation Note 9 0.05 %/W

D

resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
P

= (T

D(max)

temperature, and the regulator will go into thermal shutdown. See the “Thermal Considerations” section for details.

range from 100µA to 100mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.

differential.

the load current plus the ground pin current.

regulation effects. Specifications are for a 100mA load pulse at VIN = –16V for t = 10ms.

J(max)–TA

) ÷ θJA, where θJA is 235°C/W. Exceeding the maximum allowable power dissipation will result in excessive die

OUT
OUT

I

OUT

I

OUT

I

OUT
OUT

I

OUT

I

OUT

I

OUT

OUT

– 1V to –16V 0.055 0.15 %/V

OUT

= 100µA to 100mA, Note 6 2.0 %
= 100µA35mV
= 10mA 250 mV
= 50mA 360 450 mV
= 100mA 480 600 mV
= 100µA70µA
= 10mA 250 µA
= 50mA 0.7 mA
= 100mA 2.1 3.0 mA

= 0V 160 300 mA

, the junction-to-ambient thermal

J(max)

MIC5270 284 March 1999