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MIC5206
Micrel
MIC5206
150mA Low-Noise LDO Regulator
General Description
The MIC5206 is an efficient linear voltage regulator with very low dropout voltage (typically 17mV at light loads and 165mV at 150mA), and very low ground current (600A at 100mA output), with better than 1% initial accuracy. It has a logic compatible enable/shutdown control input and an internal undervoltage monitor. Designed especially for hand-held, battery-powered devices, the MIC5206 can be switched by a CMOS or TTL compatible logic signal. When disabled, power consumption drops nearly to zero. Dropout ground current is minimized to prolong battery life. Key features include an undervoltage monitor with an error flag output, a reference bypass pin to improve its already lownoise performance (8-lead versions only), reversed-battery protection, current limiting, and overtemperature shutdown. The MIC5206 is available in several fixed voltages in a tiny SOT-23-5 package. It features a pinout, similar to the LP2980, but has significantly better performance. Fixed and adjustable output voltage versions, featuring the reference bypass option, are available in the 8-lead Micrel Mini 8TM 8-lead MSOP (micro small-outline package).
Features
* * * * * * * * * * * * Error flag indicates undervoltage fault High output voltage accuracy Guaranteed 150mA output Ultra-low-noise output (8-lead versions) 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
For low-dropout regulators that are stable with ceramic output capacitors, see the Cap MIC5245/6/7 family.
Typical Applications
47k VOUT
1 8 7 6 5
VIN
Enable Shutdown
MIC5206-x.xBM5 VIN
1 2 Enable Shutdown Enable (pin 3) may be connected directly to Supply Input (pin 1). 3 4 5
1F
2 3 4
VOUT 100k COUT 1F tantalum
Flag Output (optional) tantalum R1
MIC5206BMM
Enable (pin 7) may be connected directly to Supply Input (pin 8).
Flag Output (optional)
R2
SOT-23-5 Fixed Voltage Application
Adjustable Voltage Application
Micrel Mini 8TM is a trademark of Micrel, Inc. Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
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MIC5206
MIC5206
Micrel
Ordering Information
Part Number MIC5206-2.5BM5 MIC5206-2.7BM5 MIC5206-3.0BM5 MIC5206-3.2BM5 MIC5206-3.3BM5 MIC5206-3.6BM5 MIC5206-3.8BM5 MIC5206-4.0BM5 MIC5206-5.0BM5 MIC5206BMM MIC5206-3.0BMM MIC5206-3.3BMM MIC5206-3.6BMM MIC5206-3.8BMM MIC5206-4.0BMM MIC5206-5.0BMM Marking LD25 LD27 LD30 LD32 LD33 LD36 LD38 LD40 LD50 -- -- -- -- -- -- -- Volts 2.5 2.7 3.0 3.2 3.3 3.6 3.8 4.0 5.0 Adj 3.0 3.3 3.6 3.8 4.0 5.0 Accuracy 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% Junction Temp. Range -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 -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 8-lead MSOP 8-lead MSOP 8-lead MSOP 8-lead MSOP 8-lead MSOP 8-lead MSOP 8-lead MSOP
Other voltages available. Contact Micrel for details.
Pin Configuration
EN GND IN
3 2 1
LDxx
4 5
FLAG
OUT
MIC5206-xxBM5 (Fixed Output Voltage)
OUT OUT FLAG GND 1 2 3 4 8 7 6 5 IN EN GND BYP OUT OUT FLAG GND 1 2 3 4 8 7 6 5 IN EN GND ADJ
MIC5206-x.xBMM (Fixed Output Voltage)
MIC5206BMM (Adjustable Ouput Voltage)
Pin Description
MIC5206 SOT-23-5 1 2 3 4 MIC5206 MSOP-8 8 4, 6 7 3 5 (fixed) 5 (adj.) 5 1,2 Pin Name IN GND EN FLAG BYP ADJ OUT Pin Function Supply Input Ground Enable/Shutdown (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. Error Flag (Output): Open-collector output. Active low indicates an ouput undervoltage condition. 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 Output
MIC5206
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MIC5206
Micrel
Absolute Maximum Ratings (Note 1)
Supply Input Voltage (VIN) ............................ -20V to +20V Enable Input Voltage (VEN) ........................... -20V to +20V Power Dissipation (PD) ............... Internally Limited, Note 3 Junction Temperature (TJ) ....................... -40C to +125C Lead Temperature (Soldering, 5 sec.) ...................... 260C
Operating Ratings (Note 2)
Supply Input Voltage (VIN) ........................... +2.5V to +16V Enable Input Voltage (VEN) .................................. 0V to VIN Junction Temperature (TJ) ....................... -40C to +125C SOT-23-5 (JA) ......................................................... Note 3 8-lead MSOP (JA) ................................................... Note 3
Electrical Characteristics
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 Conditions variation from nominal 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 Enable Input VIL VIH IIL IIH Error Flag Output VERR VOL IFL Flag Threshold Output Logic-Low Voltage Flag Leakage Current undervoltage condition (below nominal) Note 9 IL = 1mA, undervoltage condition flag off, VFLAG = 0V to 16V -1 -2 -6 0.2 0.1 -10 0.4 +1 % V A Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current regulator shutdown regulator enabled VIL 0.4V VIL 0.18V VIH 2.0V VIH 2.0V 2.0 0.01 5 -1 -2 20 25 0.4 0.18 V V V A A A A Ripple Rejection Current Limit Thermal Regulation Output Noise VOUT = 0V Note 8 IL = 50mA, CL = 4.7F, 470pF from BYP to GND (MM package only) Min -1 -2 40 0.004 0.02 17 110 140 165 0.01 80 350 600 1300 75 320 0.05 260 500 0.012 0.2 50 70 150 230 250 300 275 350 1 5 125 150 600 800 1000 1500 1900 2500 Typical Max 1 2 Units % % ppm/C %/V % mV mV mV mV mV mV mV mV A A A A A A A A A A dB mA %/W
nV Hz
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MIC5206
Note 1: Note 2. Note 3: Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating.
Micrel
Note 4: Note 5: Note 6: Note 7: Note 8: Note 9:
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-x.xBM5 (all versions) is 220C/W, and the MIC5206-x.xBMM (all versions) is 200C/W, mounted on a PC board (see "Thermal Considerations" for further details). Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 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. 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. 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. 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. The error flag comparator includes 3% hysteresis.
Typical Characteristics
Power Supply Rejection Ratio
VIN = 6V VOUT = 5V PSRR (dB)
0 -20 PSRR (dB) -40 -60 -80
0 -20 -40 -60 -80
Power Supply Rejection Ratio
RIPPLE REJECTION (dB)
VIN = 6V VOUT = 5V
Power Supply Ripple Rejection vs. Voltage Drop
60 50 40 30 20 10 0 0 COUT = 1F 0.1 0.2 0.3 VOLTAGE DROP (V) 0.4 1mA
10mA
IOUT = 100mA
IOUT = 100A COUT = 1F
IOUT = 100A COUT = 2.2F CBYP = 0.01F
-100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
-100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+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 PSRR (dB)
0 -20 -40 -60 -80
Power Supply Rejection Ratio
RIPPLE REJECTION (dB)
VIN = 6V VOUT = 5V
Power Supply Ripple Rejection vs. Voltage Drop
100 90 80 70 60 50 40 30 20 10 0 IOUT = 100mA 10mA COUT = 2.2F CBYP = 0.01F 0 0.1 0.2 0.3 VOLTAGE DROP (V) 0.4 1mA
IOUT = 1mA COUT = 1F
IOUT = 1mA COUT = 2.2F CBYP = 0.01F
-100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
-100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
MIC5206
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MIC5206
Micrel
Typical Characteristics
Power Supply Rejection Ratio
VIN = 6V VOUT = 5V PSRR (dB)
0 -20 PSRR (dB) -40 -60 -80
0 -20 -40 -60 -80
Power Supply Rejection Ratio
10000
VIN = 6V VOUT = 5V
Turn-On Time vs. Bypass Capacitance
TIME (s)
IOUT = 10mA COUT = 2.2F CBYP = 0.01F
1000
100
IOUT = 10mA COUT = 1F
-100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
-100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
10 10
100 1000 CAPACITANCE (pF)
10000
0 -20 PSRR (dB) -40 -60 -80
Power Supply Rejection Ratio
VIN = 6V VOUT = 5V PSRR (dB)
0 -20 -40 -60 -80
Power Supply Rejection Ratio
10
VIN = 6V VOUT = 5V
Noise Performance
10mA, COUT = 1F 1 NOISE (V/Hz) 0.1 0.01 0.001 VOUT = 5V 0.0001 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 1mA COUT = 1F CBYP = 10nF
IOUT = 100mA COUT = 1F
-100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
-100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
IOUT = 100mA COUT = 2.2F CBYP = 0.01F
Noise Performance
10 1 NOISE (V/Hz) 0.1 0.01 0.001 VOUT = 5V COUT = 10F electrolytic 1mA 100mA NOISE (V/Hz) 10mA 10 1
Noise Performance
10 1 10mA 0.1 0.01 100mA NOISE (V/Hz) 0.1
Noise Performance
100mA
0.0001 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
VOUT = 5V COUT = 22F 1mA 0.001 tantalum CBYP = 10nF 0.0001 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
1mA VOUT = 5V COUT = 10F 0.001 electrolytic 10mA CBYP = 100pF 0.0001 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0.01
Noise Performance
10 1 NOISE (V/Hz) 0.1 0.01 0.001 1mA 10mA 100mA 10
Noise Performance
320 DROPOUT VOLTAGE (mV) 280 240 200 160 120 80 40 0 0 10mA 100mA 0.1 0.01 0.001 1mA
Dropout Voltage vs. Output Current
1 NOISE (V/Hz)
+125C +25C
VOUT = 5V COUT = 10F electrolytic CBYP = 1nF
VOUT = 5V COUT = 10F electrolytic CBYP = 1nF
-40C
0.0001 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0.0001 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
40 80 120 160 OUTPUT CURRENT (mA)
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MIC5206
Micrel
If an error indication is not required, FLAG may be left open and the pullup resistor may be omitted. Enable Pin Ramp and the Error Flag To prevent indeterminate behavior on the error flag during power down of the device, ensure that the fall time of the enable pin signal, from logic high to logic low, is faster than 100s. Fixed Regulator Applications
MIC5206-x.xBM5 VIN
1 2 3 4 5
Applications 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 (enable) to IN (supply input). Refer to the text with Figures 1a and 2. 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. See Figure 2. 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 MIC5206 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 2). 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. 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. 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. Error Flag Ouput 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 pullup resistor from IN to FLAG is shown in all schematics. MIC5206 6
VOUT 100k COUT 1F
Error Flag
EN (pin 3) may be connected directly to IN (pin 1).
Figure 1a. Low-Noise Fixed Voltage Application EN (pin 3) is shown connected to IN (pin 1) for an application where enable/shutdown is not required. The error flag is shown with a 100k pullup resistor.
47k VOUT 1F Flag Output (optional)
1 2 3 4 8 7 6 5
VIN Enable
MIC5206-x.xBMM
Figure 1b. Low-Noise Fixed Voltage Application Figure 1b is an example of a basic configuration where the lowest-noise operation is not required. COUT = 1F minimum. The error flag is shown with a 47k pullup resistor. Ultra-Low-Noise Application
47k VOUT Flag Output (optional) 2.2F
1 2 3 4 8 7 6
VIN
BYP MIC5206-x.xBMM
5
CBYP 470pF
Figure 2. Ultra-Low-Noise Fixed Voltage Application Figure 2 includes a 470pF capacitor for low-noise operation and shows EN (pin 7) connected to IN (pin 8) for an application where enable/shutdown is not required. The error flag is shown with a 47k pullup resistor. Adjustable Regulator Applications Figure 3 shows the MIC5206BMM adjustable output voltage configuration. Two resistors set the output voltage. The formula for output voltage is: R2 VOUT = 1.242V x + 1 R1 January 2000
MIC5206
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.
47k VOUT Flag Output (optional) 2.2F
1 2 3 4 8 7 6
Micrel
PC Board Dielectric FR4 Ceramic
VIN
JA 220C/W 200C/W
SOT-23-5 Thermal Characteristics The "worst case" value of 220C/W assumes no ground plane, minimum trace widths, and a FR4 material board. The MIC5206-xxBMM (8-lead MSOP) has a thermal resistance of 200C/W when mounted on a FR4 board with minimum trace widths and no ground plane.
PC Board Dielectric FR4 JA 200C
ADJ MIC5206BMM
5
R1
R2
CBYP 470pF
Figure 3. Ultra-Low-Noise Adjustable Voltage Application Figure 3 also includes a 470pF capacitor for lowest-noise operation and shows EN (pin 7) connected to IN (pin 8) for an application where enable/shutdown is not required. COUT = 2.2F minimum. The error flag is shown with a 47k pullup resistor. Thermal Considerations
MSOP Thermal Characteristics Nominal Power Dissipation and Die Temperature The MIC5206-x.xBM5 at a 25C ambient temperature will operate reliably at over 450mW power dissipation when mounted in the "worst case" manner described above. At an ambient temperature of 40C, the device may safely dissipate over 380mW. These power levels are equivalent to a die temperature of 125C, the maximum operating junction temperature for the MIC5206. For additional heat sink characteristics, please refer to Micrel Application Hint 17, "Calculating P.C. Board Heat Sink Area For Surface Mount Packages".
Layout The MIC5206-x.xBM5 (5-lead SOT-23 package) has the following thermal characteristics when mounted on a single layer copper-clad printed circuit board. Multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity.
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MIC5206
MIC5206
Micrel
Package Information
1.90 (0.075) REF 0.95 (0.037) REF
1.75 (0.069) 1.50 (0.059)
3.00 (0.118) 2.60 (0.102)
DIMENSIONS: MM (INCH) 3.02 (0.119) 2.80 (0.110) 1.30 (0.051) 0.90 (0.035) 10 0 0.15 (0.006) 0.00 (0.000) 0.20 (0.008) 0.09 (0.004)
0.50 (0.020) 0.35 (0.014)
0.60 (0.024) 0.10 (0.004)
SOT-23-5 (M5)
0.122 (3.10) 0.112 (2.84)
0.199 (5.05) 0.187 (4.74)
DIMENSIONS: INCH (MM)
0.120 (3.05) 0.116 (2.95) 0.036 (0.90) 0.032 (0.81) 0.043 (1.09) 0.038 (0.97) 0.012 (0.30) R
0.007 (0.18) 0.005 (0.13)
0.012 (0.03) 0.0256 (0.65) TYP
0.008 (0.20) 0.004 (0.10)
5 MAX 0 MIN
0.012 (0.03) R 0.039 (0.99) 0.035 (0.89) 0.021 (0.53)
8-Lead MSOP (MM)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2000 Micrel Incorporated
MIC5206
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January 2000

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