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MIC5216
500mA-Peak Output LDO Regulator
General Description
The MIC5216 is an efficient linear voltage regulator with high peak output current capability, very low dropout voltage, and better than 1% output voltage accuracy. Dropout is typically 10mV at light loads and less than 500mV at full load. The MIC5216 is designed to provide a peak output current for startup conditions where higher inrush current is demanded. It features a 500mA peak output rating. Continuous output current is limited only by package and layout. The MIC5216 has an internal undervoltage monitor with a flag output. It also can be enabled or shutdown by a CMOS or TTL compatible signal. When disabled, power consumption drops nearly to zero. Dropout ground current is minimized to help prolong battery life. Other key features include reversed-battery protection, current limiting, overtemperature shutdown, and low noise performance. The MIC5216 is available in fixed output voltages in space-saving SOT-23-5 and MM8TM 8-pin power MSOP packages. For higher power requirements see the MIC5209 or MIC5237. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* Error Flag indicates undervoltage fault * Guaranteed 500mA-peak output over the full operating temperature range * Low 500mV maximum dropout voltage at full load * Extremely tight load and line regulation * Tiny SOT-23-5 and MM8TM power MSOP-8 package * Low-noise output * Low temperature coefficient * Current and thermal limiting * Reversed input polarity protection * CMOS/TTL-compatible enable/shutdown control * Near-zero shutdown current
Applications
* * * * * * Laptop, notebook, and palmtop computers Cellular telephones and battery-powered equipment Consumer and personal electronics PC Card VCC and VPP regulation and switching SMPS post-regulator/dc-to-dc modules High-efficiency linear power supplies
Typical Application
5V Low-Noise Regulator
3.3V Low-Noise Regulator
MM8 and Micrel Mini 8 are trademarks of Micrel, 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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MIC5216
Ordering Information
Part Number Standard MIC5216-2.5BMM MIC5216-3.3BMM MIC5216-5.0BMM MIC5216-2.5BM5 MIC5216-3.3BM5 MIC5216-3.6BM5 MIC5216-5.0BM5 LH25 LH33 LH36 LH50 Marking Pb-Free MIC5216-2.5YMM MIC5216-3.3YMM MIC5216-5.0YMM MIC5216-2.5YM5 MIC5216-3.3YM5 MIC5216-3.6YM5 MIC5216-5.0YM5 LH25 LH33 LH36 LH50 Marking 2.5V 3.3V 5.0V 2.5V 3.3V 3.6V 5.0V Voltage Junction Temp. Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C Package 8-Pin MSOP 8-Pin MSOP 8-Pin MSOP 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23
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Pin Configuration
MIC5216-xxBMM/YMM MM8TM MSOP-8 Fixed Voltages
MIC5216-xxBM5/YM5 SOT-23-5 Fixed Voltages
Pin Description
Pin Number MSOP-8 2 5-8 3 1 4 Pin Number SOT-23-5 1 2 5 3 4 Pin Name IN GND OUT EN FLG Pin Function Supply Input Ground: MSOP-8 pins 5 through 8 are internally connected. Regulator Output Enable (Input): CMOS compatible control input. Logic high = enable; logic low or open = shutdown. Error Flag (Output): Open-Collector output. Active low indicates an output undervoltage condition.
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Absolute Maximum Ratings
Supply Input Voltage (VIN).............................. -20V to +20V Power Dissipation (PD) ..............................Internally Limited Junction Temperature (TJ) ........................-40C to +125C Lead Temperature (soldering, 5 sec.)........................ 260C
Operating Ratings
Supply Input Voltage (VIN)................................. 2.5V to 12V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Thermal Resistance (JA).......................................... Note 1
Electrical Characteristics
VIN = VOUT +1V; COUT = 4.7F; IOUT = 100A; TJ = 25C, bold values indicate -40C < TJ < +125C, unless noted.
Symbol VO VO/T VO/VO VO/VO VIN - VO Parameter Output Voltage Accuracy Output Voltage Temperature Coefficient Line Regulation Load Regulation Dropout Voltage, Note 4 Condition Variation from nominal VOUT Note 2 VIN = VOUT +1V to 12V IOUT = 100A to 150mA (Note 3) IOUT = 100A IOUT = 50mA IOUT = 150mA IOUT = 500mA IGND Ground Pin Current, Notes 5, 6 (per regulator) VEN 3.0V, IOUT = 100A VEN 3.0V, IOUT = 50mA VEN 3.0V, IOUT = 150mA VEN 3.0V, IOUT = 500mA IGND PSRR ILIMIT VO/PD eno Quiescent Current, Note 6 Ripple Rejection Current Limit Thermal Regulation Output Noise VEN 0.4V VEN 0.18V Frequency = 120Hz VOUT = 0V Note 7 IOUT = 50mA, COUT = 2.2F Min -1 -2 40 0.009 0.05 10 115 165 300 80 350 1.8 8 0.05 0.10 75 700 0.05 500 1000 0.05 0.1 0.5 0.7 60 80 175 250 300 400 500 600 130 170 650 900 2.5 3.0 20 25 3 8 Typ Max 1 2 Units % % ppm/C %/V %/V % % mV mV mV mV mV mV mV mV A A A A mA mA mA mA A A dB mA %/W nV/Hz
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Symbol VENL VENH IENL IENH
Parameter Enable Input Voltage
Condition VEN = logic low (regulator shutdown) VEN = logic high (regulator enabled)
Min
Typ
Max 0.4 0.18
Units V V V A A A A
Enable Input
2.0 0.01 0.01 5 -1 -2 20 25
Enable Input Current
VENL 0.4V VENL 0.18V VENH 2.0V
Error Flag Output VERR VIL IFL
Notes: 1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max), the junction-to-ambient thermal resistance, JA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: 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. See Table 1 and the "Thermal Considerations" section for details. 2. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 3. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 100mA to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 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. 5. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current. 6. VEN is the voltage externally applied to devices with the EN (enable) input pin. 7. Thermal regulation is defined as the change in output voltage at a time "t" after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 500mA load pulse at VIN = 12V for t = 10ms. 8. The error flag comparator includes 3% hysteresis.
Flag Threshold Output Logic-Low Voltage Flag Leakage Current
Undervoltage condition (below nominal) Note 8 IL = 1mA, undervoltage condition Flag off, VFLAG = 0V to 12V
-2
-6 0.2
-10 0.4 +1
% V A
-1
0.1
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Typical Characteristics
0 -20 PSRR (dB) -40 -60 -80 IOUT = 100A COUT = 1F
Power Supply Rejection Ratio
VIN = 6V VOUT = 5V PSRR (dB)
0 -20 -40 -60 -80
Power Supply Rejection Ratio
VIN = 6V VOUT = 5V PSRR (dB)
0 -20 -40 -60 -80
Power Supply Rejection Ratio
VIN = 6V VOUT = 5V
-100 1E+11E+21E+31E+41E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
-100 1E+11E+21E+31E+41E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
IOUT = 1mA COUT = 1F
IOUT = 100mA COUT = 1F
-100 1E+11E+21E+31E+41E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
60 RIPPLE REJECTION (dB) 50 40 30 20 10 0
Power Supply Ripple Rejection vs. Voltage Drop
500mA pending NOISE (V/ Hz) 1mA 10mA IOUT = 100mA
10 1 0.1
Noise Performance
10mA, C OUT = 1F NOISE (V/ Hz)
10 1 0.1 0.01
Noise Performance
100mA 10mA 500mA Pending
0.01 500mA Pending 0.001
COUT = 1F 0 0.1 0.2 0.3 VOLTAGE DROP (V) 0.4
VOUT = 5V 0.0001 10 100 1k 10k 100k 1M 10M 1E+11E+21E+3 1E+41E+5 1E+61E+7 FREQUENCY (Hz)
VOUT = 5V 1mA 0.001 C = 10F OUT electrolytic 0.0001 10 100 1k 10k 100k 1M 10M 1E+11E+2 1E+31E+4 1E+51E+6 1E+7 FREQUENCY (Hz)
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Block Diagram
MIC5216 Fixed Regulator with External Components
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MIC5216 Thermal Considerations The MIC5216 is designed to provide 200mA of continuous current in two very small profile packages. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the thermal resistance, junction-toambient, of the device and the following basic equation.
PD(MAX) =
Application Information
The MIC5216 is designed for 150mA to 200mA output current applications where a high current spike (500mA) is needed for short, startup conditions. Basic application of the device will be discussed initially followed by a more detailed discussion of higher current applications. Enable/Shutdown Forcing EN (enable/shutdown) high (> 2V) enables the regulator. EN is compatible with CMOS logic. If the enable/shutdown feature is not required, connect EN to IN (supply input). See Figure 5. Input Capacitor 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 Capacitor An output capacitor is required between OUT and GND to prevent oscillation. 1F minimum is recommended. Larger values improve the regulator's transient response. The output capacitor value may be increased without limit. The output capacitor should have an ESR (equivalent series resistance) of about 5 or less and a resonant frequency above 1MHz. Ultralow-ESR capacitors could cause oscillation and/or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but more expensive. Many aluminum electrolytics have electrolytes that freeze at about -30C, so solid tantalums are recommended for operation below -25C. At lower values of output current, less output capacitance is needed for stability. The capacitor can be reduced to 0.47F for current below 10mA or 0.33F for currents below 1mA. No-Load Stability The MIC5216 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Error Flag Output The error flag is an open-collector output and is active (low) when an undervoltage of approximately 5% below the nominal output voltage is detected. A pull-up resistor from IN to FLAG is shown in all schematics. If an error indication is not required, FLAG may be left open and the pull-up resistor may be omitted.
(TJ(MAX) - TA )
JA
TJ(MAX) is the maximum junction temperature of the die, 125C, and TA is the ambient operating temperature. JA is layout dependent; table 1 shows examples of thermal resistance, junction-to-ambient, for the MIC5216.
Package MM8TM (MM) SOT-23-5 (M5) JA Recommended Minimum Footprint 160C/W 220C/W JA 1" Square Copper Clad 70C/W 170C/W JC 30C/W 130C/W
Table 1. MIC5216 Thermal Resistance
The actual power dissipation of the regulator circuit can be determined using one simple equation. PD = (VIN - VOUT) IOUT + VIN IGND Substituting PD(MAX) for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, if we are operating the MIC5216-3.3BM5 at room temperature, with a minimum footprint layout, we can determine the maximum input voltage for a set output current.
PD(MAX) =
(125C - 25C)
220C/W
PD(MAX) = 455mW The thermal resistance, junction-to-ambient, for the minimum footprint is 220C/W, taken from table 1. The maximum power dissipation number cannot be exceeded for proper operation of the device. Using the output voltage of 3.3V, and an output current of 150mA, we can determine the maximum input voltage. Ground current, maximum of 3mA for 150mA of output current, can be taken from the Electrical Characteristics section of the data sheet. 455mW = (VIN - 3.3V) 150mA + VIN x 3mA
455mW + 3.3V (150mA ) VIN 150mA + 3mA
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MIC5216
Therefore, to be able to obtain a constant 500mA output current from the 5216-5.0BM5 at room temperature, you need extremely tight input-output voltage differential, barely above the maximum dropout voltage for that current rating. You can run the part from larger supply voltages if the proper precautions are taken. Varying the duty cycle using the enable pin can increase the power dissipation of the device by maintaining a lower average power figure. This is ideal for applications where high current is only needed in short bursts. Figure 1 shows the safe operating regions for the MIC5216-x.xBM5 at three different ambient temperatures and at different output currents. The data used to determine this figure assumed a minimum footprint PCB design for minimum heat sinking. Figure 2 incorporates the same factors as the first figure, but assumes a much better heat sink. A 1" square copper trace on the PC board reduces the thermal resistance of the device. This improved thermal resistance improves power dissipation and allows for a larger safe operating region. Figures 3 and 4 show, safe operating regions for the MIC5216-x.xBMM, the power MSOP package part. These graphs show three typical operating regions at different temperatures. The lower the temperature, the larger the operating region. The graphs were obtained in a similar way to the graphs for the MIC5216-x.xBM5, taking all factors into consideration and using two different board layouts, minimum footprint and 1" square copper PC board heat sink. (For further discussion of PC board heat sink characteristics, refer to Application Hint 17, "Designing PC Board Heat Sinks". The information used to determine the safe operating regions can be obtained in a similar manner to that used in determining typical power dissipation, already discussed. Determining the maximum power dissipation based on the layout is the first step, this is done in the same manner as in the previous two sections. Then, a larger power dissipation number multiplied by a set maximum duty cycle would give that maximum power dissipation number for the layout. This is best shown through an example. If the application calls for 5V at 500mA for short pulses, but the only supply voltage available is 8V, then the duty cycle has to be adjusted to determine an average power that does not exceed the maximum power dissipation for the layout.
%DC Avg.PD = (VIN - VOUT ) IOUT + VIN IGND 100 %DC 455mW = (8V - 5 V ) 500mA + 8 V x 20mA 100
Peak Current Applications The MIC5216 is designed for applications where high start-up currents are demanded from space constrained regulators. This device will deliver 500mA start-up current from a SOT-23-5 or MM8 package, allowing high power from a very low profile device. The MIC5216 can subsequently provide output current that is only limited by the thermal characteristics of the device. You can obtain higher continuous currents from the device with the proper design. This is easily proved with some thermal calculations.
If we look at a specific example, it may be easier to follow. The MIC5216 can be used to provide up to 500mA continuous output current. First, calculate the maximum power dissipation of the device, as was done in the thermal considerations section. Worst case thermal resistance (JA = 220C/W for the MIC5216x.xBM5), will be used for this example.
PD(MAX) =
(TJ(MAX) - TA )
JA
Assuming room temperature, we have a maximum power dissipation number of
PD(MAX) =
(125C - 25C)
220C/W
PD(MAX) = 455mW Then we can determine the maximum input voltage for a five-volt regulator operating at 500mA, using worst case ground current. PD(MAX) = 455mW = (VIN - VOUT) IOUT + VIN IGND IOUT = 500mA VOUT = 5V IGND =20mA 455mW = (VIN - 5V) 500mA + VIN x 20mA 2.995mW = 520mA x VIN VIN(MAX) =
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2.955W = 5.683V 520mA
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MIC5216 PD x 50mA = 173mW However, this is continuous power dissipation, the actual on-time for the device at 50mA is (100%-12.5%) or 87.5% of the time, or 87.5% duty cycle. Therefore, PD must be multiplied by the duty cycle to obtain the actual average power dissipation at 50mA. PD x 50mA = 0.875 x 173mW PD x 50mA = 151mW The power dissipation at 500mA must also be calculated. PD x 500mA = (5V - 3.3V) 500mA + 5V x 20mA PD x 500mA = 950mW This number must be multiplied by the duty cycle at which it would be operating, 12.5%. PD x = 0.125mA x 950mW PD x = 119mW
%Duty Cycle 455mW = 1.66W 100
%Duty Cycle 0.274 = 100 % Duty Cycle Max = 27.4% With an output current of 500mA and a three-volt drop across the MIC5216-xxBMM, the maximum duty cycle is 27.4%. Applications also call for a set nominal current output with a greater amount of current needed for short durations. This is a tricky situation, but it is easily remedied. Calculate the average power dissipation for each current section, then add the two numbers giving the total power dissipation for the regulator. For example, if the regulator is operating normally at 50mA, but for 12.5% of the time it operates at 500mA output, the total power dissipation of the part can be easily determined. First, calculate the power dissipation of the device at 50mA. We will use the MIC5216-3.3BM5 with 5V input voltage as our example. PD x 50mA = (5V - 3.3V) x 50mA + 5V x 650A
a. 25C Ambient
b. 50C Ambient
c. 85C Ambient
Figure 1. MIC5216-x.xBM5 (SOT-23-5) on Minimum Recommended Footprint
a. 25C Ambient
b. 50C Ambient
2
c. 85C Ambient
Figure 2. MIC5216-x.xBM5 (SOT-23-5) on 1-inch Copper Cladding
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a. 25C Ambient
b. 50C Ambient
c. 85C Ambient
Figure 3. MIC5216-x.xBMM (MSOP-8) on Minimum Recommended Footprint
a. 25C Ambient
b. 50C Ambient
2
c. 85C Ambient
Figure 4. MIC5216-x.xBMM (MSOP-8) on on 1-inch Copper Cladding
The total power dissipation of the device under these conditions is the sum of the two power dissipation figures. PD(total) = PD x 50mA + PD x 500mA PD(total) = 151mW + 119mW PD(total) = 270mW The total power dissipation of the regulator is less than the maximum power dissipation of the SOT-23-5 package at room temperature, on a minimum footprint board and therefore would operate properly. Multilayer boards with a ground plane, wide traces near the pads, and large supply-bus lines will have better thermal conductivity. For additional heat sink characteristics, please refer to Micrel Application Hint 17, "Designing P.C. Board Heat Sinks", included in Micrel's Databook. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to Regulator Thermals section of Micrel's Designing with Low-Dropout Voltage Regulators handbook.
Fixed Regulator Circuits
VIN MIC5216 IN EN 100k OUT FLG GND VOUT
1F
Figure 5. Low-Noise Fixed Voltage Regulator
Figure 5 shows a basic MIC5216-x.xBMx fixed-voltage regulator circuit. A 1F minimum output capacitor is required for basic fixed-voltage applications. The flag output is an open-collector output and requires a pull-up resistor to the input voltage. The flag indicates an undervoltage condition on the output of the device.
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Package Information
8-Pin MSOP (MM)
SOT-23-5 (M5)
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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) 2000 Micrel, Incorporated.
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