MIC5205 150mA Low-Noise LDO Regulator

General Description

The MIC5205 is an efficient linear voltage regulator with ultra low-noise output, very low dropout voltage (typically 17mV at light loads and 165mV at 150mA), and very low ground current (600⎧A at 100mA output). The MIC5205 offers better than 1% initial accuracy.

Designed especially for hand-held, battery-powered devices, the MIC5205 includes a CMOS or TTL compatible enable/shutdown control input. When shut down, power consumption drops nearly to zero. Regulator ground current increases only slightly in dropout, further prolonging battery life.

Key MIC5205 features include a reference bypass pin to improve its already excellent low-noise performance, reversed-battery protection, current limiting, and overtemperature shutdown.

The MIC5205 is available in fixed and adjustable output voltage versions in a small SOT-23-5 package.

For low-dropout regulators that are stable with ceramic output capacitors, see the µCap MIC5245/6/7 family. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com.

Features

• Ultra-low-noise output

• High output voltage accuracy

• Guaranteed 150mA output

• Low quiescent current

• Low dropout voltage

• Extremely tight load and line regulation

• Very low temperature coefficient

• Current and thermal limiting

• Reverse-battery protection

• “Zero” off-mode current

• Logic-controlled electronic enable

Applications

• Cellular telephones

• Laptop, notebook, and palmtop computers

• Battery-powered equipment

• PCMCIA VCC and VPP regulation/switching

• Consumer/personal electronics

• SMPS post-regulator/dc-to-dc modules

• High-efficiency linear power supplies

Absolute Maximum Ratings⁽¹⁾

Supply Input Voltage (V_IN).............................. –20V to +20V

Enable Input Voltage (V_EN)............................. –20V to +20V

Power Dissipation (P_D).................Internally Limited, Note 3

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

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

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

Operating Ratings⁽²⁾

Input Voltage (V_IN)......................................... +2.5V to +16V

Enable Input Voltage (V_EN).....................................0V to V_IN

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

Thermal Resistance, SOT-23-5 (θ_JA)........................ Note 3

Typical Application

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