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MIC5205
150mA Low-Noise LDO Regulator
General Description
The MIC5205 is an efficient linear voltage regulator with ultra low-noise output, very low dropout voltage (typically 17mV at light loads and 165mV at 150mA), and very low ground current (600A at 100mA output). The MIC5205 offers better than 1% initial accuracy. Designed especially for hand-held, battery-powered devices, the MIC5205 includes a CMOS or TTL compatible enable/shutdown control input. When shut down, power consumption drops nearly to zero. Regulator ground current increases only slightly in dropout, further prolonging battery life. Key MIC5205 features include a reference bypass pin to improve its already excellent low-noise performance, reversed-battery protection, current limiting, and overtemperature shutdown. The MIC5205 is available in fixed and adjustable output voltage versions in a small SOT-23-5 package. For low-dropout regulators that are stable with ceramic output capacitors, see the Cap MIC5245/6/7 family. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * * * * Ultra-low-noise output High output voltage accuracy Guaranteed 150mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Reverse-battery protection "Zero" off-mode current Logic-controlled electronic enable
Applications
* * * * * * * Cellular telephones Laptop, notebook, and palmtop computers Battery-powered equipment PCMCIA VCC and VPP regulation/switching Consumer/personal electronics SMPS post-regulator/dc-to-dc modules High-efficiency linear power supplies
___________________________________________________________________________________________________________
Typical Application
Ultra-Low-Noise Regulator Application
Xxxxx is a trademark of Micrel, Inc Xxxxx is a registered trademark 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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MIC5205
Ordering Information
Part Number Standard MIC5205BM5 MIC5205-2.5BM5 MIC5205-2.7BM5 MIC5205-2.8BM5 MIC5205-2.85BM5 MIC5205-2.9BM5 MIC5205-3.0BM5 MIC5205-3.1BM5 MIC5205-3.2BM5 MIC5205-3.3BM5 MIC5205-3.6BM5 MIC5205-3.8BM5 MIC5205-4.0BM5 MIC5205-5.0BM5
Note: 1. Underbar (_) symbol may not be to scale.
Marking Pb-Free Standard LBAA LB25 LB27 LB28 LB2J LB29 LB30 LB31 LB32 LB33 LB36 LB38 LB40 LB50 Pb-Free(1) KBAA KB25 KB27 KB28 KB2J KB29 KB30 KB31 KB32 KB33 KB36 KB38 KB40 KB50
Accuracy 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1%
Voltage Adj 2.5V 2.7V 2.8V 2.85V 2.9V 3.0V 3.1V 3.2V 3.3V 3.6V 3.8V 4.0V 5.0V
Temperature -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5
MIC5205YM5 MIC5205-2.5YM5 MIC5205-2.7YM5 MIC5205-2.8YM5 MIC5205-2.85YM5 MIC5205-2.9YM5 MIC5205-3.0YM5 MIC5205-3.1YM5 MIC5205-3.2YM5 MIC5205-3.3YM5 MIC5205-3.6YM5 MIC5205-3.8YM5 MIC5205-4.0YM5 MIC5205-5.0YM5
Pin Configuration
MIC5205-x.xBM5/YM5 Fixed Voltages
MIC5205BM5/YM5 Adjustable Voltages
Pin Description
MIC5205-x.x (fixed) 1 2 3 4 4 5 5 MIC5205 (adjustable) 1 2 3 Pin Name IN GND EN BYP ADJ OUT Pin Function Supply Input Ground Enable/Shudown (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown Reference Bypass: Connect external 470pF capacitor to GND to reduce output noise. May be left open. Adjust (Input): Adjustable regulator feedback input. Connect to resistor voltage divider. Regulator Ouput
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN).............................. -20V to +20V Enable Input Voltage (VEN)............................. -20V to +20V Power Dissipation (PD) .................Internally Limited, Note 3 Lead Temperature (soldering, 5 sec.)........................ 260C Junction Temperature (TJ) ........................-40C to +125C Storage Temperature (TS).........................-65C to +150C
Operating Ratings(2)
Input Voltage (VIN)......................................... +2.5V to +16V Enable Input Voltage (VEN).....................................0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Thermal Resistance, SOT-23-5 (JA) ........................ Note 3
Electrical Characteristics(4)
VIN = VOUT + 1V; IL = 100A; CL = 1.0F; VEN 2.0V; 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 6 Condition variations from specified VOUT Note 4 VIN = VOUT + 1V to 16V IL = 0.1mA to 150mA, Note 5 IL = 100A IL = 50mA IL = 100mA IL = 150mA IGND IGND Quiescent Current Ground Pin Current, Note 7 VEN 0.4V (shutdown) VEN 0.18V (shutdown) VEN 2.0V, IL = 100A IL = 50mA IL = 100mA IL = 150mA PSRR ILIMIT VO/PD eNO Ripple Rejection Current Limit Thermal Regulation Output Noise Frequency = 100Hz, IL = 100A VOUT = 0V Note 8 IL = 50mA, CL = 2.2F, 470pF from BYP to GND Min -1 -2 40 0.004 0.02 10 110 140 165 0.01 80 350 600 1300 75 320 0.05 260 500 0.012 0.05 0.2 0.5 50 70 150 230 250 300 275 350 1 5 125 150 600 800 1000 1500 1900 2500 Typ Max 1 2 Units % %
ppm/C
%/V %/V % % mV mV mV mV mV mV mV mV A A A A A A A A A A dB mA %/W
nV/ Hz
ENABLE Input VIL VIH IIL IIH Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current regulator shutdown regulator enabled VIL 0.4V VIL 0.18V VIL = 2.0V VIL = 2.0V 2.0 0.01 2 5 -1 -2 20 25 0.4 0.18 V V V A A A A
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Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating.
MIC5205
3. The maximum allowable power dissipation at 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. The JA of the MIC5205-xxBM5 (all versions) is 220C/W mounted on a PC board (see "Thermal Considerations" section for further details). 4. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 5. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 6. 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. 7. 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. 8, 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 150mA load pulse at VIN = 16V for t = 10ms.
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MIC5205
Typical Characteristics
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MIC5205
Typical Characteristics
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MIC5205
Block Diagrams
Ultra-Low-Noise Fixed Regulator
Ultra-Low-Noise Adjustable Regulator
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MIC5205 0.33F for currents below 1mA. No-Load Stability The MIC5205 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. Thermal Considerations The MIC5205 is designed to provide 150mA of continuous current in a very small package. 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 junction-to-ambient thermal resistance of the device and the following basic equation:
Application Information
Enable/Shutdown Forcing EN (enable/shutdown) high (> 2V) 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). See Figure 1. 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. Reference Bypass Capacitor BYP (reference bypass) is connected to the internal voltage reference. A 470pF capacitor (CBYP) connected from BYP to GND quiets this reference, providing a significant reduction in output noise. CBYP reduces the regulator phase margin; when using CBYP, output capacitors of 2.2F or greater are generally required to maintain stability. The start-up speed of the MIC5205 is inversely proportional to the size of the reference bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of CBYP. Likewise, if rapid turn-on is necessary, consider omitting CBYP. If output noise is not a major concern, omit CBYP and leave BYP open. Output Capacitor An output capacitor is required between OUT and GND to prevent oscillation. The minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used. 1.0F minimum is recommended when CBYP is not used (see Figure 2). 2.2F minimum is recommended when CBYP is 470pF (see Figure 1). Larger values improve the regulator's transient response. The output capacitor value may be increased without limit. The output capacitor should have an ESR (effective series resistance) of about 5 or less 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. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.47F for current below 10mA or February 2006 8
PD(max) =
(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 junction-toambient thermal resistance for the MIC5205.
JA JA Square Recommended Copper Clad Minimum Footprint SOT-23-5(M5) 220C/W 170C/W Table 1. SOT-23-5 Thermal Resistance Package JC
130C/W
The actual power dissipation of the regulator circuit can be determined using the 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, when operating the MIC5205-3.3BM5 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows:
PD(max) =
(125C - 25C)
220C/W PD(max) = 455mW
The junction-to-ambient thermal resistance for the minimum footprint is 220C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 150mA, the maximum input voltage can be determined. From the Electrical Characteristics table, the maximum ground current for 150mA output current is 2500A or 2.5mA. 455mW = (VIN - 3.3V) 150mA + VIN*2.5mA 455mW = VINx150mA - 495mW + VIN*2.5mA 950mW = VINx152.5mA
M9999-020806 (408) 955-1690
Micrel VIN(max) = 6.23V Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6.2V in a SOT23-5 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.
MIC5205 resistors set the output voltage based on the following equation:
R2 VOUT = 1.242V x + 1 R1
Fixed Regulator Applications
This equation is correct due to the configuration of the bandgap reference. The bandgap voltage is relative to the output, as seen in the block diagram. Traditional regulators normally have the reference voltage relative to ground and have a different VOUT equation. Resistor values are not critical because ADJ (adjust) has a high input impedance, but for best results use resistors of 470k or less. A capacitor from ADJ to ground provides greatly improved noise performance.
Figure 1. Ultra-Low-Noise Fixed Voltage Application
Figure 1 includes a 470pF capacitor for low-noise operation and shows EN (pin 3) connected to IN (pin 1) for an application where enable/shutdown is not required. COUT = 2.2F minimum.
Figure 3. Ultra-Low-Noise
Adjustable Voltage Application Figure 3 includes the optional 470pF noise bypass capacitor from ADJ to GND to reduce output noise.
Figure 2. Low-Noise Fixed Voltage Application
Figure 2 is an example of a low-noise configuration where CBYP is not required. COUT = 1F minimum.
Adjustable Regulator Applications The MIC5205BM5 can be adjusted to a specific output voltage by using two external resistors (Figure 3). The
Dual-Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground.
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MIC5205
Package Information
SOT-23-5 (M5)
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) 2004 Micrel, Incorporated.
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