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MIC5306
150mA Micropower Cap Baseband LDO
General Description
The MIC5306 is a micropower, Cap low dropout regulator designed for optimal performance in a small space. It is capable of sourcing 150mA of output current and only draws 16A of operating current. This high performance LDO offers fast transient response and good PSRR while consuming a minimum of current. Ideal for battery operated applications; the MIC5306 offers 1% accuracy, extremely low dropout voltage (45mV @ 100mA). Equipped with a TTL logic compatible enable pin, the MIC5306 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5306 is a Cap design, operating with very small ceramic output capacitors for stability, reducing required board space and component cost. The MIC5306 is available in fixed output voltages in Thin SOT23-5 packaging.
Features
* * * * * Input voltage range: 2.25V to 5.5V Ultra-low IQ: Only 16A operating current Stable with ceramic output capacitor Low dropout voltage of 45mV @ 100mA High output accuracy - 1.0% initial accuracy - 2.0% over temperature * Thermal Shutdown Protection * Current Limit Protection
Applications
* * * * * * Digital Logic Power Supply Stand-by power supply Cellular phones PDAs Portable electronics Notebook PCs
_________________________________________________________________________________________________________
Typical Application
20 18 16 14 12 10 8 6 4 2 0 VOUT = 2.8V VIN = VOUT + 1V COUT = 1F TEMPERATURE (C)
Ground Pin Current vs. Temperature
150mA 100A
MIC5306 VIN 1F EN GND VOUT 1F
Applications Co-processor
Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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MIC5306
Block Diagram
VIN
OUT
EN
1.25V Reference
GND
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MIC5306
Ordering Information
Part Number MIC5306-1.8YD5 MIC5306-2.5YD5 MIC5306-2.6YD5
Note: * Under bar symbol may not to scale. ** For other voltage options. Contact Micrel for details.
Marking Code* N918 N925 N926
Output Voltage** 1.8V 2.5V 2.6V
Junction Temp. Range -40C to 125C -40C to 125C -40C to 125C
Package TSOT23-5 TSOT23-5 TSOT23-5
Pin Configuration
EN GND VIN 1 3 2
4 N/C
5 OUT
MIC5306-x.xYD5
Pin Description
Pin Number 1 2 3 4 5 Pin Name IN GND EN NC OUT Pin Function Supply Input Ground Enable Input. Active High. High = on, low = off. Do not leave floating. No Connect Output Voltage
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) .............................. 0V to 6V Enable Input Voltage (VEN)............................. 0V to 6V Power Dissipation (PD) ...................Internally Limited(3) Junction Temperature ...................... -40C to +125C Lead Temperature (soldering, 5sec.) .................260C Storage Temperature (Ts) ................ -65C to +150C
Operating Ratings(2)
Supply Input Voltage (VIN)........................2.25V to 5.5V Enable Input Voltage (EN1/EN2/LOWQ)................... 0V to VIN Junction Temperature (TJ) ................. -40C to +125C TSOT23-5(JA) ............................................... 235C
Electrical Characteristics
VIN = VOUT + 1.0V; COUT = 1.0F, IOUT = 100A; TJ = 25C, bold values indicate -40C to +125, unless noted.
Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage(4) Ground Pin Current Ground Pin Current in Shutdown Ripple Rejection Current Limit Thermal Shutdown Thermal Shutdown Hysteresis Output Voltage Noise Enable Input Enable Input Voltage Enable Input Current Turn-on Time(5)
Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = TJ(max) - TA / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 4. 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 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V. 5. Turn-on time is measured from Ven=1V of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
Conditions Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT +1V to 5.5V IOUT = 100A to 150mA IOUT = 50mA IOUT = 100mA IOUT = 150mA IOUT = 0mA to 150mA; VIN = 5.5V VEN 0.2V; VIN = 5.5V f = 10Hz to 1kHz; COUT = 1F; IOUT = 150mA f = 20kHz; COUT = 1F; IOUT = 150mA VOUT = 0V
Min -1 -2
Typ
0.01 0.5 25 45 65 16 0.01 62 35 285 150 15 91
Max +1 +2 0.3 0.5 1 1.5
Units % % %/V % mV
200 25 1 A A dB 500 mA C C Vrms V V A A s
175
COUT = 1F; 10Hz to 100kHz Logic Low Logic High VIL 0.2V VIH 1.0V COUT = 1F
0.2 1 0.01 0.01 250 1 1 500
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Typical Characteristics
Ripple Rejection
-80
20 GROUND CURRENT (A)
150mA
Ground Pin Current vs. Output Current
-70 -60 -50 dB -40 -30 -20 100A
18 16 14 12 10 8 6 4 2 0 0 VOUT = 2.8V VIN = VOUT + 1V COUT = 1F 20 40 60 80 100 120 140 OUTPUT CURRENT (mA)
20 18 16 14 12 10 8 6 4 2 0
Ground Pin Current vs. Temperature
150mA 100A
VOUT = 2.8V -10 VIN = VOUT + 1V COUT = 1F 0 0.01 0.1 1 10 100 1000 FREQUENCY (kHz)
VOUT = 2.8V VIN = VOUT + 1V COUT = 1F TEMPERATURE (C)
18 GROUND CURRENT (uA) 16 14 12 10 8 6 4 2 0 2
Ground Pin Current vs. Supply Voltage
DROPOUT VOLTAGE (mV)
150mA 100A
80 70 60 50 40 30 20 10 0 0
Dropout Voltage vs. Output Current
DROPOUT VOLTAGE (mV)
100 90 80 70 60 50 40 30 20 10 0
Dropout Voltage vs. Temperature
150mA
100mA
50mA 25mA
VOUT = 2.8V COUT = 1F 2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE (V)
VOUT = 2.8V VIN = VOUT + 1V COUT = 1F 20 40 60 80 100 120 140 OUTPUT CURRENT (mA)
TEMPERATURE (C)
3 2.5
Output Voltage vs. Supply Voltage
3.4
150mA
Output Voltage vs. Temperature
3.2 3 2.8 2.6 2.4 VOUT = 2.8V VIN = VOUT + 1V COUT = 1F IOUT = 100A TEMPERATURE (C)
1E+02
Output Noise Spectral Density
1E+01
2 100A 1.5 1 0.5 0 0 VOUT = 2.8V COUT = 1F 1 2 3 4 5 SUPPLY VOLTAGE (V)
1E-00 1E-01 VOUT = 2.8V VIN = 3.8V COUT = 1F ROUT 1E-02 0.01 0.1 1 10 100 1000 10000 FREQUENCY (kHz)
2.2 2
350 OUTPUT CURRENT (mA) 300 250 200 150 100 50
Current Limit vs. Supply Voltage
ENABLE THRESHOLD (V)
1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
Enable Threshold vs. Temperature
0 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 SUPPLY VOLTAGE (V)
VOUT = 2.8V COUT = 1F
TEMPERATURE (C)
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Functional Characteristics
Enable Turn-On Transient
Line Transient Response
Enable Voltage (1V/div)
Input Voltage (1V/div)
5V 4V
Output Voltage (1V/div)
Output Voltage (20mV/div)
VOUT = 2.8V VIN = V OUT + 1V COUT = 1F
VOUT = 2.8V VIN = VOUT + 1V COUT = 1F
Time (100s/div)
Time (400s/div)
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MIC5306 is typically < 50A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (3.8V - 2.8V) 150mA PD = 0.15W To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation: TJ(max) - TA PD(max) =
JA
Applications Information
Input Capacitance A 1F capacitor should be placed from IN to GND if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input. Output Capacitance An output capacitor is required between OUT and GND to prevent oscillation. Larger values improve the regulator's transient response. The output capacitor value may be increased without limit. The output capacitor should have below ESR 300m and a resonant frequency above 1MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. Since many aluminum electrolytics have electrolytes that freeze at about -30C, solid tantalums are recommended for operation below -25C. Enable Forcing EN (enable/shutdown) high (>1V) enables the regulator. EN is compatible with CMOS logic gates. If the enable/shutdown feature is not required, connect EN (pin 3) to IN (supply input, pin 1). Current Limit There is overcurrent protection circuitry built into the MIC5306. Even with the output grounded, current will be limited to approximately 285mA. Further protection is provided by thermal shutdown. Thermal Considerations The MIC5306 is designed to provide 150mA 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. Given that the input voltage is 3.8V, the output voltage is 2.8V and the output current equals 150mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT) IOUT + VIN IGND Because this device is CMOS and the ground current
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 235C/W Table 1 shows junction-to-ambient thermal resistance for the MIC5306 in the TSOT23-5 package.
Package TSOT23-5 JA Recommended Minimum Footprint 235C/W JC 2C/W
Table 1. TSOT23-5 Thermal Resistance
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 235C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5306-2.8 at an input voltage of 3.8V and 150mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.15W = (125C - T) / 235C/W T = 89.75C Therefore, a 2.8V application at 150mA of output current can accept an ambient operating temperature of 89.8C in a TSOT23-5 package. 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
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Package Information
5-Pin TSOT-23
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Inc.
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