MIC5504-XYMT

Part: MIC5501/2/3/4 — Micrel Inc.

Type: Low-Dropout (LDO) Linear Regulator

Description: 2.5 V to 5.5 V input, 300 mA low-dropout linear regulator with 160 mV dropout at 300 mA and 38 μA typical ground current.

Operating Conditions:

• Supply voltage: 2.5 V to 5.5 V
• Operating temperature: -40 °C to +125 °C (junction)
• Enable voltage: 0 V to VIN

Absolute Maximum Ratings:

• Max supply voltage: 6 V (-0.3 V to 6 V)
• Max junction/storage temperature: -65 °C to +150 °C (storage), -40 °C to +150 °C (junction)

Key Specs:

• Output voltage accuracy: ±2.0% (TJ = 25 °C), ±3.0% (-40 °C to +125 °C)
• Dropout voltage: 160 mV typ., 380 mV max. at IOUT = 300 mA
• Dropout voltage: 80 mV typ., 190 mV max. at IOUT = 150 mA
• Ground pin current: 38 μA typ., 55 μA max. at IOUT = 0 mA
• Ground pin current: 42 μA typ., 65 μA max. at IOUT = 300 mA
• Ground pin current in shutdown: 0.05 μA typ., 1 μA max. at VEN = 0 V
• Current limit: 400 mA min., 630 mA typ., 900 mA max. (VOUT = 0 V)
• Ripple rejection: 60 dB at f = 1 kHz (COUT = 1 μF)
• Turn-on time: 50 μs typ., 125 μs max. (COUT = 1 μF, IOUT = 150 mA)

Features:

• Fixed output voltages from 1.0 V to 3.3 V
• 300 mA guaranteed output current
• Stable with 1 μF ceramic output capacitors
• Output discharge circuit (MIC5502, MIC5504)
• Internal enable pull-down resistor (MIC5503, MIC5504)
• Thermal-shutdown and current-limit protection
• Zero-off-mode current state when disabled

Applications:

• Smart phones
• DSC, GPS, PMP, and PDAs
• Medical devices
• Portable electronics
• 5V systems

Package:

• 4-lead Thin DFN (1.0 mm × 1.0 mm)
• 5-pin SOT23

• Input voltage range: 2.5V to 5.5V
• Fixed output voltages from 1.0V to 3.3V
• 300mA guaranteed output current
• High output accuracy (±2%)
• Low quiescent current: 38μA
• Stable with 1μF ceramic output capacitors
• Low dropout voltage: 160mV @ 300mA
• Output discharge circuit: MIC5502, MIC5504
• Internal enable pull-down: MIC5503, MIC5504
• Thermal-shutdown and current-limit protection
• 4-lead 1.0mm × 1.0mm Thin DFN package
• MIC5504 5-pin SOT23 package

• Smart phones
• DSC, GPS, PMP, and PDAs
• Medical devices
• Portable electronics
• 5V systems

___________________________________________________________________________________________________________

4-Pin 1mm × 1mm Thin DFN (MT) (Top View)

5-Pin SOT23 (M5) (Top View)

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

The MIC5501/2/3/4 is designed to provide 300mA 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 = 300mA. The actual power dissipation of the regulator circuit can be determined using Equation 1:

$$P_{\mathrm{D}} = (V_{\mathrm{IN}} - V_{\mathrm{OUT1}}) I_{\mathrm{OUT}} + V_{\mathrm{IN}} I_{\mathrm{GND}}$$

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

$$\begin{aligned} \mathrm{P_D} &= (3.6\text{V} - 2.8\text{V}) \times 300\text{mA} \ \mathrm{P_D} &= 0.240\text{W} \end{aligned}$$

To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and Equation 2:

$$P_{D(\max)} = \left(\frac{T_{J(\max)} - T_A}{\theta_{JA}}\right)$$

TJ(max) = 125°C, the maximum junction temperature of the die, θJA thermal resistance = 250°C/W for the DFN package.

Substituting PD for P D(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-toambient 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-MYMT at an input voltage of 3.6V and 300mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows:

$$0.240\text{W} = (125^\circ\text{C} - \text{T}{\text{A}})/(250^\circ\text{C}/\text{W}) \ \text{T}{\text{A}} = 65^\circ\text{C}$$

Therefore, the maximum ambient operating temperature allowed in a 1mm × 1mm 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 Micrel's Designing with Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at:

http://www.micrel.com/_PDF/other/LDOBk_ds.pdf

Micrel Inc. · 2180 Fortune Drive · San Jose, CA 95131 · USA · tel +1 (408) 944-0800 · fax + 1 (408) 474-1000 · http://www.micrel.com

4-Pin 1mm x 1mm Thin DFN (MT)