Can ship immediately
General Description
The MIC39100, MIC39101, and MIC39102 are 1A low dropout linear voltage regulators that provide low voltage, high current output from an extremely small package. The MIC39100/1/2 offers extremely low dropout (typically 410 mV at 1A) and low ground current (typically 11 mA at 1A).
The MIC39100 is a fixed output regulator offered in the SOT-223 package. The MIC39101 and MIC39102 are fixed and adjustable regulators, respectively, in a thermally enhanced 8-lead SOIC package.
The MIC39100/1/2 is ideal for PC add-in cards that need to convert from standard 5V to 3.3V,3.3V to 2.5V,or 2.5V to 1.8V. A guaranteed maximum dropout voltage of 630 mV over all operating conditions allows the MIC39100/1/2 to provide 2.5V from a supply as low as 3.13V and 1.8V from a supply as low as 2.43V.
The MIC39100/1/2 is fully protected with overcurrent limiting, thermal-shutdown, and reverse-battery protection. Fixed voltages of 5.0V, 3.3V, 2.5V, and 1.8V are available on MIC39100/1 with adjustable output voltages to 1.24V on MIC39102.
Enable Input
The MIC39101 and MIC39102 feature an active-HIGH enable input (EN) that allows on/off control of the regulator. Current drain reduces to zero when the device is shutdown, with only microamperes (µA) of leakage current. The EN input has TTL/CMOS-comparable thresholds for simple logic interfacing. EN can be directly tied to VIN and pulled-up to the maximum supply voltage.
Characteristics
One of the secrets of the MIC39101/2’s performance is its power SO-8 package. Lower thermal resistance means more output current or higher input voltage for a given package size.
Lower thermal resistance is achieved by joining the four ground leads with the die attach paddle to create a single-piece electrical and thermal conductor. This concept has been used by MOSFET manufacturers for years, proving very reliable and cost effective for the user.
Thermal resistance consists of two main elements, θJC (junction-to-case thermal resistance) and θCA (case-to-ambient thermal resistance, see Figure 4-3).
θJC is the resistance from the die to the leads of the package. θCA is the resistance from the leads to the ambient air and it includes θCS (case-to-sink thermal resistance) and θSA (sink-to-ambient thermal resistance).
Features
1. Fixed and Adjustable Output Voltages to 1.24V
2. 410 mV Typical Dropout at 1A Load
- Best Recommended for 3.0V to 2.5V Conversion
- Best Recommended for 2.5V to 1.8V Conversion
3. 1A Minimum Guaranteed Output Current
4. 1% Initial Accuracy
5. Low Ground Current
6. Current-Limiting and Thermal-Shutdown Protection
7. Reversed-Battery and Reversed-Leakage Protection
8. Fast Transient Response
9. Low Profile SOT-223 Package
10. Power SO-8 Package Applications
11. LDO Linear Regulator for PC Add-In Cards
12. High-Efficiency Linear Power Supplies
13. SMPS Post Regulator
14. Multimedia and PC Processor Supplies
15. Battery Chargers
16. Low Voltage Microcontrollers and Digital Logic
