MIC5504-3.3YM5

Part: MIC5501/2/3/4

Type: Low Dropout (LDO) Regulator

Key Specs:

• Input Voltage Range: 2.5V to 5.5V
• Fixed Output Voltages: 1.0V to 3.3V
• Guaranteed Output Current: 300 mA
• Output Accuracy: ±2%
• Low Quiescent Current: 38 μA
• Low Dropout Voltage: 160 mV @ 300 mA

Features:

• Stable with 1 μF Ceramic Output Capacitors
• Output Discharge Circuit (MIC5502, MIC5504)
• Internal Enable Pull-Down (MIC5503, MIC5504)
• Thermal-Shutdown and Current-Limit Protection
• Zero-off-mode current state
• Operating Junction Temperature Range: –40°C to +125°C

Applications:

• Smartphones
• DSC, GPS, PMP, and PDAs
• Medical Devices
• Portable Electronics
• 5V Systems

Package:

• 4-Lead 1.0 mm x 1.0 mm Thin DFN Package
• MIC5501/4 5-Lead SOT23 Package

• Input Voltage Range: 2.5V to 5.5V
• Fixed Output Voltages from 1.0V to 3.3V
• 300 mA Guaranteed Output Current
• High Output Accuracy (±2%)
• Low Quiescent Current: 38 μA
• Stable with 1 μF Ceramic Output Capacitors
• Low Dropout Voltage: 160 mV @ 300 mA
• Output Discharge Circuit: MIC5502, MIC5504
• Internal Enable Pull-Down: MIC5503, MIC5504
• Thermal-Shutdown and Current-Limit Protection
• 4-Lead 1.0 mm x 1.0 mm Thin DFN Package
• MIC5501/4 5-Lead SOT23 Package

• Smartphones
• DSC, GPS, PMP, and PDAs
• Medical Devices
• Portable Electronics
• 5V Systems

The descriptions of the pins are listed in Table 3-1.

Absolute Maximum Ratings †

• Enable Voltage (VEN) –0.3V to VIN
• Power Dissipation (PD) Internally Limited, Note 1
• ESD Rating (Note 2) 3 kV

Operating Ratings ‡

† Notice: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability.

‡ Notice: The device is not guaranteed to function outside its operating ratings.

• Note 1: The maximum allowable power dissipation of any TA (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.
  • 2: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series with 100 pF.

TABLE 1-1: ELECTRICAL CHARACTERISTICS

Electrical Characteristics: VIN = VEN = VOUT + 1V; CIN = COUT = 1 μF; IOUT = 100 μA; TJ = +25°C, bold values indicate –40°C to +125°C, unless noted.

TABLE 1-1: ELECTRICAL CHARACTERISTICS (CONTINUED)

Electrical Characteristics: VIN = VEN = VOUT + 1V; CIN = COUT = 1 μF; IOUT = 100 μA; TJ = +25°C, bold values indicate –40°C to +125°C, unless noted.

Note 1: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects are covered by the thermal regulation specification.

2: Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. For outputs below 2.5V, dropout voltage is the input-to-output differential with the minimum input voltage 2.5V.

3: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current.

TEMPERATURE SPECIFICATIONS (Note 1)

Note 1: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.

2.0 TYPICAL PERFORMANCE CURVES

Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

FIGURE 2-1: Power Supply Rejection Ratio.

FIGURE 2-2: Dropout Voltage vs. Output Current.

FIGURE 2-3: Dropout Voltage vs. Temperature.

FIGURE 2-4: Ground Current vs. Supply Voltage.

FIGURE 2-5: Ground Current vs. Load Current.

Temperature.

FIGURE 2-6: Ground Current vs.

FIGURE 2-7: Output Voltage vs. Output Current.

Voltage.

FIGURE 2-8: Output Voltage vs. Supply

FIGURE 2-9: Output Voltage vs. Temperature.

FIGURE 2-10: Current Limit vs. Supply Voltage.

FIGURE 2-11: Enable Turn-On.

FIGURE 2-14: Load Transient.

FIGURE 2-15: Line Transient.

FIGURE 2-16: Auto-Discharge (No Load).

3.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1: PIN FUNCTION TABLE

4.0 APPLICATION INFORMATION

MIC5501/2/3/4 are low-noise 300 mA LDOs. The MIC5502 and MIC5504 include an auto-discharge circuit that is switched on when the regulator is disabled through the enable (EN) pin. The MIC5503 and MIC5504 have an internal pull-down resistor on the EN pin to ensure the output is disabled if the control signal is tri-stated. The MIC5501/2/3/4 regulators are fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown.

4.1 Input Capacitor

The MIC5501/2/3/4 are high performance, high bandwidth devices. An input capacitor of 1 μF is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional high frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high frequency noise and are good practice in any RF-based circuit. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics lose most of their capacitance over temperature and are therefore, not recommended.

4.2 Output Capacitor

The MIC5501/2/3/4 require an output capacitor of 1 μF or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors are not recommended because they may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1 μF ceramic output capacitor and does not improve significantly with larger capacitance.

X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range.

4.3 No-Load Stability

Unlike many other voltage regulators, the MIC5501/2/3/4 remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications.

4.4 Enable/Shutdown

The MIC5501/2/3/4 each come with an active-high enable pin that allows the regulator to be disabled. Forcing the EN pin low disables the regulator and sends it into an off mode current state drawing virtually zero current. When disabled, the MIC5502 and MIC5504 switches an internal 25Ω load on the regulator output to discharge the external capacitor.

Forcing the EN pin high enables the output voltage. The MIC5501 and MIC5502 enable pin uses CMOS technology and the EN pin cannot be left floating; a floating EN pin may cause an indeterminate state on the output. The MIC5503 and MIC5504 have an internal pull-down resistor on the enable pin to disable the output when the enable pin is floating.

4.5 Thermal Considerations

The MIC5501/2/3/4 are designed to provide 300 mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. For example if the input voltage is 3.6V, the output voltage is 2.8V, and the output current is 300 mA. The actual power dissipation of the regulator circuit can be determined using Equation 4-1:

EQUATION 4-1:

$P_D = (V_IN - V_OUT1) × I_OUT + V_IN × I_GND$

Because this device is CMOS and the ground current is typically <100 μA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation:

EQUATION 4-2:

$P_D = (3.6V - 2.8V) × 300mA = 0.240 W$

To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and Equation 4-3:

EQUATION 4-3:

$P_D(MAX) = frac{T_J(MAX) - T_A}{Θ_JA}$

Where:

TJ(MAX) = 125°C, the max. junction temp. of the die. θJA = Thermal resistance of 250°C/W for the DFN package.

Substituting PD for PD(MAX) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 250°C/W.

The maximum power dissipation must not be exceeded for proper operation.

For example, when operating the MIC5501-YMT at an input voltage of 3.6V and 300 mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows:

EQUATION 4-4:

0.240W 125C TA = – 250C/W TA = 65C

Therefore, the maximum ambient operating temperature allowed in a 1 mm × 1 mm DFN package is 65°C. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the "Regulator Thermals" section of Microchip's Designing with Low-Dropout Voltage Regulators handbook.

5.0 PACKAGING INFORMATION

5.1 Package Marking Information

5-Lead SOT23* XX

TABLE 5-1: ABBREVIATED TOP MARK

4-Lead TDFN 1 mm x 1 mm Package Outline and Recommended Land Pattern

APPENDIX A: REVISION HISTORY

Revision A (April 2018)

• Converted Micrel document MIC5501/2/3/4 to Microchip data sheet DS20006006A.
• Minor text changes throughout.

NOTES:

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• Enable Voltage (VEN) –0.3V to VIN
• Power Dissipation (PD) Internally Limited, Note 1
• ESD Rating (Note 2) 3 kV

The MIC5501/2/3/4 are designed to provide 300 mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. For example if the input voltage is 3.6V, the output voltage is 2.8V, and the output current is 300 mA. The actual power dissipation of the regulator circuit can be determined using Equation 4-1: