MCP1702T-2502E/CB

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1. Describe

The MCP1702T-2502E/CB is a CMOS low dropout (LDO) family Voltage regulator that provides up to 250 mA current while consuming only 2.0 µA of quiescent current current (typical). Input working range is specified from 2.7V to 13.2V, making it two to Six primary battery powered applications, 9V Powered by alkaline batteries and one or two lithium-ion batteries application. The MCP1702T-2502E/CB is capable of delivering 250 mA Input to output voltage is only 625 mV (typ) Differential (VOUT = 2.8V). Output voltage tolerance Typical for MCP1702 is ±0.4% at +25°C and ±3% Maximum operating junction temperature The range is -40°C to +125°C. Line regulation is ±0.1% Typical at +25°C. The available output voltage range of the MCP1702 is 1.2V to 5.0V. LDO output is stable only when used 1 µF output capacitor. ceramic, tantalum or Aluminum electrolytic capacitors can be used for input and output. overcurrent limit and Thermal Shutdown Provides Robust Solution for any application. Package options include SOT-23A, SOT-89-3 and TO-92.

2. Feature

    1. 2.0 µA quiescent current (typ)

    2. Input operating voltage range: 2.7V to 13.2V

    3. 250 mA output current, output voltage  2.5V

    4. 200 mA output current, output voltage < 2.5V

    5. Low dropout (LDO) voltage

        - 625 mV typical @ 250 mA (VOUT = 2.8V)

    6. 0.4% typical output voltage tolerance

    7. Standard output voltage options:

        - 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 4.0V, 5.0V

    8. Output voltage range from 1.2V to 5.5V in 0.1V increments (50mV increments available on request)

    9. Stable 1.0 µF to 22 µF output capacitance

  10. Short circuit protection

  11. Overheating protection

3. Application

    1. Battery powered devices

    2. Battery powered alarm circuit

    3. Smoke Detectors

    4. CO2 detector

    5. Pagers and cell phones

    6. Smart battery pack

    7. Low quiescent current voltage reference

    8. Pocket PC

    9. Digital camera

  10. Microcontroller power supply

  11. Solar Instruments

  12. Consumer Products

  13. Battery powered data logger

4. Function Description

The MCP1702T-2502E/CB CMOS LDO linear regulator is suitable for applications requiring the lowest current consumption while maintaining output voltage regulation. The MCP1702 operates over a continuous load range of 0 mA to 250 mA. The input operating voltage range is 2.7V to 13.2V, enabling it to operate from two or more alkaline batteries or single and multiple Li-Ion batteries.

5. Ground terminal

The regulator is grounded. Connect GND to the negative of the output and the negative of the input capacitor. Only the LDO bias current (2.0 µA typical) flows from this pin; there is no large current. LDO output Adjustment refers to this pin. Minimize the voltage drop between this pin and the negative side of the load.

6. Regulated output voltage

Connect VOUT to the positive side of the load and the positive side of the output capacitor. The positive side of the output capacitor should be physically as close to the LDO VOUT pin as possible. The current flowing out of this pin is equal to the DC load current.

7. UNREGULATED INPUT VOLTAGE PIN

Connect VIN to the input unregulated source voltage. As with all LDO linear regulators, low source impedance is necessary for stable LDO operation. The capacitance required to ensure low source impedance depends on the proximity of the input source capacitors or the type of battery. For most applications, a 1 µF capacitor will ensure stable operation of the LDO circuit. For applications with load currents below 100 mA, the input capacitance requirement can be reduced. The type of capacitors used can be ceramic, tantalum or aluminum electrolytic capacitors. The low ESR characteristics of ceramic will result in better noise and PSRR performance at high frequencies

8. Output regulation

A portion of the LDO output voltage is fed back to the internal error amplifier and compared to a precision internal bandgap reference. The error amplifier output will adjust the amount of current flowing through the P-channel pass transistor, thereby regulating the output voltage to the desired value. Any change in input voltage or output current causes the error amplifier to respond and adjust the output voltage to the target voltage.

9. Overcurrent

The MCP1702T-2502E/CB internal circuitry monitors the amount of current flowing through the P-channel pass transistor. In the event of a short circuit or excessive output current, the MCP1702 will shut down the P-channel device for a short time, after which the LDO will attempt to restart. If excessive current persists, the cycle will repeat itself.

10. Over temperature

The internal power dissipation of the LDO is a function of the input-to-output voltage difference and load current. If the power dissipation in the LDO is too high, the internal junction temperature will rise Above typical shutdown threshold of 150°C. At this point, the LDO will turn off and begin to cool down to the typical turn-on junction temperature The temperature is 130°C. if power consumption is low enough that the device will Continue to cool and operate normally. If the power dissipation remains high, thermal shutdown The protection circuit will turn off the LDO again, protect it from catastrophic failure

11. Device Junction Temperature Rise

The internal junction temperature rise is a function of the internal power dissipation and the thermal resistance of the application from junction to ambient. The thermal resistance from junction to ambient is derived from the EIA/JEDEC standard for measuring the thermal resistance of small surface mount packages. The EIA/JEDEC specification is JESD51-7, "Efficient Thermally Conductive Test Board for Leaded Surface Mount Packages". This standard describes test methods and board specifications for measuring thermal resistance from junction to ambient. The actual thermal resistance for a specific application can vary based on many factors, such as copper area and thickness.

12. Pulsed Load Applications

For some applications, there are pulsed load current events that may exceed the specified 250 mA maximum specification of the MCP1702. The internal current limit of the MCP1702 will prevent high peak load demands from causing non-recoverable damage. The 250 mA rating is a maximum average continuous rating. As long as the average current does not exceed 250 mA, pulsed higher load currents can be applied to the MCP1702. The typical current limit for the MCP1702 is 500 mA (TA +25°C).