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MIC5207
180mA Low-Noise LDO Regulator
General Description
The MIC5207 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 (720A at 100mA output). The MIC5207 offers better than 3% initial accuracy. Designed especially for hand-held, battery-powered devices, the MIC5207 includes a CMOS or TTL compatible enable/shutdown control input. When in shutdown, power consumption drops nearly to zero. Key MIC5207 features include a reference bypass pin to improve its already low-noise performance, reversedbattery protection, current limiting, and overtemperature shutdown. The MIC5207 is available in fixed and adjustable output voltage versions in a small SOT-23-5 package. Contact Micrel for details. 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 180mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Reversed-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
Battery-Powered Regulator Application
Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
December 2007
M9999-123107
Micrel, Inc.
MIC5207
Ordering Information
Part Number MIC5207-1.8BD5 MIC5207BM5 MIC5207-1.8BM5 MIC5207-2.5BM5 MIC5207-2.8BM5 MIC5207-3.0BM5 MIC5207-3.2BM5 MIC5207-3.3BM5 MIC5207-3.6BM5 MIC5207-3.8BM5 MIC5207-4.0BM5 MIC5207-5.0BM5 MIC5207-3.3BZ*** MIC5207-1.8YD5 MIC5207YM5 MIC5207-1.8YM5 MIC5207-2.5YM5 MIC5207-2.8YM5 MIC5207-2.9YM5 MIC5207-3.0YM5 MIC5207-3.1YM5 MIC5207-3.2YM5 MIC5207-3.3YM5 MIC5207-3.6YM5 MIC5207-3.8YM5 MIC5207-4.0YM5 MIC5207-5.0YM5 MIC5207-3.3YZ***
*
Marking NE18 LEAA LE18 LE25 LE28 LE30 LE32 LE33 LE36 LE38 LE40 LE50 -NE18** LEAA** LE18** LE25** LE28** LE29** LE30** LE31** LE32** LE33** LE36** LE38** LE40** LE50** --
Voltage* 1.8V Adj. 1.8V 2.5V 2.8V 3.0V 3.2V 3.3V 3.6V 3.8V 4.0V 5.0V 3.3V 1.8V Adj. 1.8V 2.5V 2.8V 2.9V 3.0V 3.1V 3.2V 3.3V 3.6V 3.8V 4.0V 5.0V 3.3V
Junction Temp. Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C
Package 5-Pin Thin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 3-Pin TO-92 5-Pin Thin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 3-Pin TO-92
Lead Finish Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free
Other voltages available. Contact Micrel for details.
** Under bar ( __ ) symbol may not be to scale. *** TO-92 Package discontinuance notification issued September 2007. End-of-life-buy offered thru December 31, 2007. Contact factory for additional information.
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MIC5207
Pin Configuration
1 IN
2
3
GND OUT
(Bottom View)
MIC5207BM5/YM5 (M5) (Adjustable Voltage)
MIC5207-x.xBM5/YM5 (M5) MIC5207-x.xBD5/YD5 (D5) (Fixed Voltage)
MIC5207-x.xBZ/YZ (Z) (Fixed Voltage)
Pin Description
Pin Number SOT-23-5
1 2 3 4 (fixed)
Pin Number TO-92
1 2
Pin Name
IN GND EN BYP
Pin Function
Supply Input Ground Enable/Shutdown (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. Reference Bypass: Connect external 470pF capacitor to GND to reduce output noise. May be left open. For 1.8V or 2.5V operation, see "Applications Information." Adjust (Input): Adjustable regulator feedback input. Connect to resistor voltage divider. Regulator Output
4 (adj.) 5 3
ADJ OUT
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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 (3) Lead Temperature (soldering, 5 sec)......................... 260C Junction Temperature (TJ) All except 1.8V....................................-40C to +125C 1.8V ONLY.............................................. 0C to +125C Storage Temperature (TS).........................-65C to +150C
Operating Ratings(2)
Supply Input Voltage (VIN)............................. +2.5V to +16V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) All except 1.8V.................................... -40C to +125C 1.8V ONLY.............................................. 0C to +125C Thermal Resistance (JA).......................................... Note 3 MSOP-8 (JA) (3)
Electrical Characteristics
VIN = VOUT + 1V; IL = 100A; CL = 1.0F; VEN 2.0V; TJ = 25C, bold values indicate -40C < TJ < +125C except 0C < TJ < +125C for 1.8V, 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
Variation from nominal VOUT
Min
-3 -4
Typ
Max
3 4
Units
% % ppm/C
Note 4
VIN = VOUT + 1V to 16V IL = 0.1mA to 150mA, Note 5 IL = 100A IL = 50mA IL = 100mA IL = 150mA
40
0.005 0.05 17 115 140 165 0.01 80 350 720 1800 75 0.05 0.10 0.5 0.7 60 80 175 250 280 325 300 400 1 5 130 170 650 900 1100 2000 2500 3000 500
%/V %/V % % mV mV mV mV mV mV mV mV A A A A A A A A A A dB mA %/W
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
Ripple Rejection Current Limit Thermal Regulation VOUT = 0V
320
0.05
Note 8
eno
Output Noise
IL = 50mA, CL = 2.2F, 470pF from BYP to GND
260
nVHz
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Symbol
VIL VIH IIL IIH
Notes:
Parameter
Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current
Condition
Regulator shutdown Regulator enable VIL 0.4V VIL 0.18V VIH 2.0V VIH 2.0V
Min
Typ
Max
0.4 0.18
Units
V V V
Enable Input
2.0
0.01 5 -1 -2 20 25
A A A A
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 at any TA (ambient temperature) is PD(max) = (TJ(max) -TA) / JA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. The JA of the SOT-23-5 (M5) is 235C/W, and the TO-92 (Z) is 180C/W (0.4" leads) or 160C/W (0.25" leads) soldered on a PC board (see "Thermal Considerations" 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 180mA. 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 1Vdifferential. 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 180mA load pulse at VIN = 16V for t = 10ms.
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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
-100 1E+11E+21E+3 1E+4 1E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0 -20 PSRR (dB) -40 -60 -80
Power Supply Rejection Ratio
VIN = 6V VOUT = 5V
-100 1E+11E+21E+3 1E+4 1E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
IOUT = 1mA COUT = 1F
0 -20 PSRR (dB) -40 -60 -80
Power Supply Rejection Ratio
VIN = 6V VOUT = 5V TIME (s)
10000
Turn-On Time vs. Bypass Capacitance
1000
-100 1E+11E+2 1E+3 1E+41E+51E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
IOUT = 10mA COUT = 2.2F CBYP = 0.01F
100
10 10
100 1000 10000 CAPACITANCE (pF)
0 -20 PSRR (dB) -40 -60 -80
Power Supply Rejection Ratio
DROPOUT VOLTAGE (mV) VIN = 6V VOUT = 5V
320 280 240 200 160 120 80 40 0 0
Dropout Voltage vs. Output Current
+125C +25C
-100 1E+1 1E+21E+31E+41E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
IOUT = 100mA COUT = 2.2F CBYP = 0.01F
-40C
40 80 120 160 OUTPUT CURRENT (mA)
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Typical Characteristics (continued)
10 1 NOISE (V/ Hz) 0.1 0.01 0.001 VOUT = 5V 0.0001 1E+11E+21E+3 1E+4 1E+51E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
Noise Performance
10mA, C = 1F OUT
1mA COUT = 1F CBYP = 10nF
10 1 NOISE (V/ Hz) 0.1
Noise Performance
100mA
1mA VOUT = 5V COUT = 10F 0.001 electrolytic 10mA CBYP = 100pF 0.0001 1E+11E+21E+3 1E+4 1E+5 1E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0.01
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Block Diagrams
Low-Noise Fixed Regulator (TO-92 version only)
Ultra-Low-Noise Fixed Regulator
Ultra-Low-Noise Adjustable Regulator
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MIC5207 No-Load Stability The MIC5207 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 CMOSRAM keep-alive applications. Thermal Considerations The MIC5207 is designed to provide 180mA 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:
PD(MAX) =
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 MIC5207 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 under-damped 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 0.33F for currents below 1mA. December 2007 9
(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-to-ambient thermal resistance for the MIC5207.
Package SOT-23-5 (M5) JA Recommemded Minimum Footprint 235C/W JA 1" Square Copper Clad 170C/W J/C 130C/W
Table 1. SOT-23-5 Thermal Resistance
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 MIC5207-3.3BM5 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 235
PD(MAX) = 425mW 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 3000A or 3mA. 455mW = (VIN - 3.3 ) 150mA + VIN 3mA 455mW = VIN 150mA - 495mW + VIN 3mA 920mW = VIN 153mA
M9999-123107
Micrel, Inc. VIN(MAX) = 6.01V Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6V in a SOT-235 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
MIC5207
Figure 2. Low-Noise Fixed Voltage Application
Low-Voltage Operation The MIC5207-1.8 and MIC5207-2.5 require special consideration when used in voltage-sensitive systems. They may momentarily overshoot their nominal output voltages unless appropriate output and bypass capacitor values are chosen. During regulator power up, the pass transistor is fully saturated for a short time, while the error amplifier and voltage reference are being powered up more slowly from the output (see "Block Diagram"). Selecting larger output and bypass capacitors allows additional time for the error amplifier and reference to turn on and prevent overshoot. To ensure that no overshoot is present when starting up into a light load (100A), use a 4.7F output capacitance and 470pF bypass capacitance. This slows the turn-on enough to allow the regulator to react and keep the output voltage from exceeding its nominal value. At heavier loads, use a 10F output capacitance and 470pF bypass capacitance. Lower values of output and bypass capacitance can be used, depending on the sensitivity of the system. Applications that can withstand some overshoot on the output of the regulator can reduce the output capacitor and/or reduce or eliminate the bypass capacitor. Applications that are not sensitive to overshoot due to power-on reset delays can use normal output and bypass capacitor configurations. Please note the junction temperature range of the regulator at 1.8V output (fixed and adjustable) is 0C to +125C. Fixed Regulator Applications
Figure 2 is an example of a configuration. COUT = 1F minimum.
basic
low-noise
Adjustable Regulator Applications The MIC5207BM5 can be adjusted to a specific output voltage by using two external resistors (Figure 3). The resistors set the output voltage based on the following equation:
R2 VOUT = VREF 1 + , VREF = 1.242V R1 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; therefore, their equations are different from the equation for the MIC5207BM5. 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 3. Ultra-Low-Noise Adjustable Voltage Application
Figure 3 includes the optional 470pF noise bypass capacitor from ADJ to GND to reduce output noise.
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. USB Application Figure 4 shows the MIC5207-3.3BZ (3-terminal, TO-92) in a USB application. Since the VBUS supply may be greater than 10 inches from the regulator, a 1F input capacitor is included.
Figure 1. Ultra-Low-Noise Fixed Voltage Application
Figure 1 includes a 470pF capacitor for ultra-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. December 2007 10
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Figure 4. Single-Port Self-Powered Hub
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Package Information
5-Pin SOT-23 (M5)
5-Pin Thin SOT-23 (D5)
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0.090 (2.286) Radius, t yp. 2 1 3 0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143)
10 typ.
BOTTOM VIEW
0.085 (2.159) Diam . 0.185 (4.699) 0.175 (4.445) 5 typ.
0.185 (4.699) 0.175 (4.445)
0.090 (2.286) typ.
Seat ing Plane 0.025 (0.635) Max Uncont rolled Lead Diamet er 0.500 (12.70) Min.
5 t yp.
0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 0.0155 (0.3937 ) 0.0145 (0.3683 )
3-Pin TO-92 (Z)
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) 2001 Micrel, Incorporated.
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