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MIC5307
300mA Micropower Cap Baseband LDO
General Description
The MIC5307 is a micropower, Cap low dropout regulator designed for optimal performance where smaller packages are required. It is capable of sourcing 300mA of output current while only drawing 20A 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 MIC5307 offers 1% initial accuracy, extremely low dropout voltage and is equipped with a TTL logic compatible enable pin. The MIC5307 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5307 is a Cap design, operating with very small ceramic output capacitors for stability, reducing required board space and component cost. The MIC5307 is available in fixed output voltages in the Thin SOT23-5 package and the 6-pin 2mm x 2mm Thin MLF(R) package. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * Input voltage range: 2.4V to 5.5V Ultra-low IQ: Only 20A operating current Stable with ceramic output capacitor Low dropout voltage of 120mV @ 300mA 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
Ground Pin Current vs. Temperature
300mA 100A
MIC5307
VIN EN GND VOUT
1F
2.2F
26 24 22 20 18 16 14 12 10 8 6 4 2 0
VIN = VOUT + 1V VOUT = 2.8V COUT = 2.2F 20 40 60 80 TEMPERATURE (C)
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. 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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MIC5307
Block Diagram
VIN EN QuickStart VOUT
VREF
Error LDO Amp
Thermal Shutdown
Current Limit GND
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Ordering Information(1)
Part Number MIC5307-1.5YD5 MIC5307-1.8YD5 MIC5307-2.8YD5 MIC5307-3.0YD5 MIC5307-2.8YMT
Notes * Underbar ( _ ) symbol may not be to scale. ** 2x2mm Thin MLF(R) is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Marking Code QQ15* QQ18* QQ28* QQ30* Q28**
Voltage 1.5V 1.8V 2.8V 3.0V 2.8V
Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package 5-Pin TSOT23 5-Pin TSOT23 5-Pin TSOT23 5-Pin TSOT23 6-Pin 2mm x 2mm Thin MLF
(R)
Lead Finish Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free
Pin Configuration
EN GND VIN 1 3 2
EN 1 GND 2
4 N/C 5 OUT
6 NC 5 NC 4 VOUT
VIN 3
MIC5307-x.xYD5 5-Pin Thin SOT23 (D5)
MIC5307-x.xYMT 6-Pin 2mm x 2mm Thin MLF(R) (MT)
Pin Description
Pin Number TSOT23 1 2 3 4 5 - Pin Number Thin MLF(R) 3 2 1 5 4 6 Pin Name VIN GND EN NC VOUT NC Pin Function Supply Input Ground Enable Input. Active High. High = on, low = off. Do not leave floating No Connect Output Voltage No Connect
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) ............................................... 0V to 6V Enable Input Voltage (VEN)..................................... 0V to 6V Power Dissipation (PD)(3) ...........................Internally Limited Junction Temperature (TJ) ........................-40C to +125C Lead Temperature (soldering, 5sec.)......................... 260C Storage Temperature (Ts) .........................-65C to +150C ESD Rating(4) .................................................................. 2kV
Operating Ratings(2)
Supply voltage (VIN) ....................................... 2.4V to +5.5V Enable Input Voltage.............................................. 0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Thermal Resistance TSOT23-5 (JA)................................................235C/W 2x2 Thin MLF-6 (JA) .........................................93C/W
Electrical Characteristics(5)
VIN = VOUT + 1.0V; COUT = 2.2F; IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C, unless noted.
Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage(4) Condition Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT +1V to 5.5V IOUT = 100A to 300mA IOUT = 50mA IOUT = 100mA IOUT = 150mA IOUT = 300mA IOUT = 0mA to 150mA; VIN = 5.5V IOUT = 0mA to 300mA; VIN = 5.5V VEN < 0.2V; VIN = 5.5V f = 10Hz to 1kHz; COUT = 2.2F; IOUT = 300mA f = 20kHz; COUT = 2.2F; IOUT = 300mA VOUT = 0V Min -1 -2 0.01 0.5 20 40 60 120 18 20 0.01 62 35 500 160 20 80 Typ Max +1 +2 0.3 0.5 1 1.5 Units % % %/V %/V % % mV mV mV mV A A A dB dB mA C C VRMS V V A A s
250 30 1
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(6)
Notes:
350
800
COUT = 2.2F; 10Hz to 100kHz Logic Low Logic High VIL < 0.2V VIH > 1.0V COUT = 2.2F
0.2 1.0 0.01 0.01 270 1 1 500
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. Devices are ESD sensitive. Handling precautions recommended. 5. Specification for packaged product only. 6. 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.
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Typical Characteristics
26 24 22 20 18 16 14 12 10 8 6 4 2 0 0
Ground Pin Current vs. Output Current
VIN = VOUT + 1V VOUT = 2.8V COUT = 2.2F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
26 24 22 20 18 16 14 12 10 8 6 4 2 0
Ground Pin Current vs. Temperature
300mA 100A
VIN = VOUT + 1V VOUT = 2.8V COUT = 2.2F 20 40 60 80 TEMPERATURE (C)
26 24 22 300mA 20 18 100A 16 14 12 10 8 6 4 VOUT = 2.8V 2 COUT = 2.2F 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
Ground Pin Current vs. Supply Voltage
-80 -70 -60
Power Supply Rejection Ratio
150mA
150 125
Dropout Voltage vs. Output Current
160
Dropout Voltage vs. Temperature
300mA
VOUT = 2.8V 140 COUT = 2.2F 120
-50 300mA -40 -30 -20
50mA
100 75 50 25 VOUT = 2.8V COUT = 2.2F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
100 80 60 40 20 0 150mA 100mA 50mA 100A 20 40 60 80 TEMPERATURE (C)
VIN = VOUT + 1V -10 VOUT = 2.8V COUT = 2.2F 0 0.1 1 10 100 FREQUENCY (kHz)
1,000
0 0
3.0
Output Voltage vs. Output Current
600 580
Current Limit vs. Input Voltage
3.4 3.2 3.0 2.8 2.6 2.4
Output Voltage vs. Temperature
2.9
560 540
2.8
520 500
2.7
VIN = VOUT + 1V VOUT = 2.8V COUT = 2.2F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
480 460 440 3.0 VOUT = 2.8V COUT = 2.2F 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5
2.2 2.0
2.6 0
VIN = VOUT + 1V VOUT = 2.8V COUT = 2.2F IOUT = 100A 20 40 60 80 TEMPERATURE (C)
3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0 0
Output Voltage vs. Supply Voltage
100A 300mA
10
Output Noise Spectral Density
1
0.1
VOUT = 2.8V COUT = 2.2F 1 2 3 4 5 SUPPLY VOLTAGE (V) 6
0.01 VIN = 3.8V VOUT = 2.8V COUT = 2.2F 0.001 0.01 0.1 1 10 100 1,000 FREQUENCY (kHz)
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Functional Characteristics
Enable Turn-On
Output Voltage (200mV/div)
Load Transient Response
Enable (1V/div)
300mA
Output Voltage (1V/div)
Output Current (100mA/div)
VIN = VOUT + 1V VOUT = 2.8V COUT = 2.2F
VIN = VOUT + 1V VOUT = 2.8V COUT = 2.2F Time (100s/div)
Time (10s/div)
Line Transient Response
5V
4V Input Voltage (2V/div)
VIN = VOUT + 1V Output Voltage (20mV/div) VOUT = 2.8V COUT = 2.2F
Time (200s/div)
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MIC5307 Because this device is CMOS and the ground current 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) 300mA PD = 0.3W To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: TJ(max) - TA PD(max) =
JA
Application 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 The MIC5307 requires an output capacitor of 2.2F or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 2.2F 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. 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 MIC5307. Even with the output grounded, current will be limited to approximately 500mA. Further protection is provided by thermal shutdown. Thermal Considerations The MIC5307 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. Given that the input voltage is 3.8V, the output voltage is 2.8V and the output current equals 300mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT) IOUT + VIN IGND
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 MIC5307 in the TSOT23-5 package.
Package
TSOT23-5
JA Recommended Minimum Footprint
235C/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-toambient 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 MIC5307-2.8 at an input voltage of 3.8V and 300mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.3W = (125C - TA) / 235C/W TA = 54.5C Therefore, a 2.8V application at 300mA 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 Thin SOT23 (D5)
6-Pin 2mm x 2mm Thin MLF(R) (MT)
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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) 2006 Micrel, Incorporated.
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