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MIC5211
Micrel
MIC5211
Dual Cap 80mA LDO Regulator Preliminary Information
General Description
The MIC5211 is a dual Cap 80mA linear voltage regulator with very low dropout voltage (typically 20mV at light loads), very low ground current (225A at 20mA output current), and better than 3% initial accuracy. This dual device comes in the miniature SOT-23-6 package, featuring independent logic control inputs. The Cap regulator design is optimized to work with lowvalue, low-cost ceramic capacitors. The outputs typically require only 0.1F of output capacitance for stability. Designed especially for hand-held, battery-powered devices, ground current is minimized using Micrel's proprietary Super eta PNPTM technology to prolong battery life. When disabled, power consumption drops nearly to zero. Key features include SOT-23-6 packaging, current limiting, overtemperature shutdown, and protection against reversed battery conditions. The MIC5211 is available in dual 1.8V, 2.5V, 2.7V, 2.8V, 3.0V, 3.3V, 3.6V, and 5.0V versions. Certain mixed voltages are also available. Contact Micrel for other voltages.
Features
* * * * * * * * * * * * Stable with low-value ceramic or tantalum capacitors Independent logic controls Low quiescent current Low dropout voltage Mixed voltages available Tight load and line regulation Low temperature coefficient Current and thermal limiting Reversed input polarity protection Zero off-mode current Dual regulator in tiny SOT-23 package 2.5V to 16V input range
Applications
* * * * * * Cellular telephones Laptop, notebook, and palmtop computers Battery-powered equipment Bar code scanners SMPS post regulator/dc-to-dc modules High-efficiency linear power supplies
Ordering Information
Part Number MIC5211-1.8BM6 MIC5211-2.5BM6 MIC5211-2.7BM6 MIC5211-2.8BM6 MIC5211-3.0BM6 MIC5211-3.3BM6 MIC5211-3.6BM6 MIC5211-5.0BM6 MIC5211-1.8/2.5BM6 MIC5211-1.8/3.3BM6 MIC5211-2.5/3.3BM6 Marking LFBB LFCC LFDD LFEE LFGG LFLL LFQQ LFXX LFBC LFBL LFCL LFLX Voltage 1.8V 2.5V 2.7V 2.8V 3.0V 3.3V 3.6V 5.0V 1.8V/2.5V 1.8V/3.3V 2.5V/3.3V 3.3V/5.0V Junction Temp. Range 0C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C 0C to +125C 0C to +125C -40C to +125C -40C to +125C Package SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6
Dual-Voltage Regulators
Typical Application
MIC5211-3.3/5.0BM6
Other voltages available. Contact Micrel for details.
VIN MIC5211
Enable Shutdown 1 2 3 6 5 4
Enable A
Enable Shutdown
VOUTA 0.1F 0.1F VOUTB
Enable B
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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MIC5211
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Pin Configuration
OUTA IN OUTB
6 5 4
Pin 1 Index
1
LFxx
2 3
Part Identification
ENA GND ENB Regulator A Voltage Code (VOUTA) Regulator B Voltage Code (VOUTB)
Voltage 1.8V 2.5V 2.7V 2.8V 3V 3.15V 3.3V 3.6V 5V
Code B C D E G H L Q X
Pin Description
Pin Number 1 2 3 4 5 6 Pin Name ENA GND ENB OUTB IN OUTA Pin Function Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Ground Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Regulator Output B Supply Input Regulator Output A
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Absolute Maximum Ratings (Note 1)
Supply Input Voltage (VIN) ............................ -20V to +20V Enable Input Voltage (VEN) ........................... -20V to +20V Power Dissipation (PD) ............................ Internally Limited Storage Temperature Range ................... -60C to +150C Lead Temperature (soldering, 5 sec.) ....................... 260C ESD, (Note 3) .....................................................................
Operating Ratings (Note 2)
Supply Input Voltage (VIN) ............................... 2.5V to 16V Enable Input Voltage (VEN) ................................. 0V to 16V Junction Temperature (TJ) (except 1.8V) . -40C to +125C 1.8V only .................................................. 0C to +125C 6-lead SOT-23-6 (JA) .............................................. Note 4
Electrical Characteristics
VIN = VOUT + 1V; IL = 1mA; CL = 0.1F, and VEN 2.0V; TJ = 25C, bold values indicate -40C to +125C; for one-half of dual MIC5211; unless noted. Symbol VO VO/T VO/VO VO/VO VIN - VO Parameter Output Voltage Accuracy Output Voltage Temperature Coeffcient Line Regulation Load Regulation Dropout Voltage, Note 7 Conditions variation from nominal VOUT Note 5 VIN = VOUT +1V to 16V IL = 0.1mA to 50mA, Note 6 IL = 100A IL = 20mA IL = 50mA IQ IGND Quiescent Current Ground Pin Current Note 8 VEN 0.4V (shutdown) VEN 2.0V, IL = 100A (active) IL = 20mA (active) IL = 50mA (active) ILIMIT VO/PD Enable Input Enable Input Voltage Level VIL VIH IIL IIH
Note 1: Note 2: Note 3: Note 4:
Min -3 -4
Typical
Max 3 4
Units % % ppm/C % % % % mV
50 0.008 0.08 20 200 250 0.01 90 225 750 140 0.05
200 0.3 0.5 0.3 0.5
450 500 10
mV mV A A A A mA %/W
450 1200 250
Current Limit Thermal Regulation
VOUT = 0V Note 9
logic low (off) logic high (on) Enable Input Current VIL 0.6V VIH 2.0V
Exceeding the absolute maximum rating may damage the device. The device is not guareented to function outside itsperating rating. Devices are ESD sensitive. Handling precautions recommended.
0.6 2.0 0.01 3 1 50
V V A A
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 is 220C/W for the SOT-23-6 mounted on a printed circuit board. Output voltage temperature coeffiecient 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 50mA. Change in output voltage due to heating effects are covered by 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. For output voltages below 2.5V, dropout voltage is the input-to-output voltage differential with the minimum voltage being 2.5V. Minimum input opertating voltage is 2.5V. Ground pin current is the quiescent current per regulator 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 50mA load pulse at VIN = 16V for t = 10ms.
Note 5: Note 6: Note 7:
Note 8: Note 9:
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Typical Characteristics
1000
Dropout Voltage vs. Output Current
400
Dropout Voltage vs. Temperature
4
Dropout Characteristics (MIC5211-3.3)
OUTPUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (V)
CIN = 10F COUT = 1F 100
300
CIN = 10F COUT = 1F IL = 50mA
3
IL = 100A
200 IL = 100A
2
IL = 50mA CIN = 10F COUT = 1F 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) 7
10
100
IL = 1mA
1
1 0.01
0.1 1 10 100 OUTPUT CURRENT (mA)
0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
0
2000
Ground Current vs. Output Current
2.0
Ground Current vs. Supply Voltage
3.0
Ground Current vs. Temperature
GROUND CURRENT (mA)
2.5 2.0 1.5 1.0 0.5 IL = 50mA IL = 100A CIN = 10F COUT = 1F
GROUND CURRENT (mA)
GROUND CURRENT (A)
1500
1.5 IL = 100A 1.0
IL = 50mA VOUT = 3.3V
1000
500 VIN = VOUT + 1V 0 0 10 20 30 40 50 60 70 80 OUTPUT CURRENT (mA)
0.5
0.0
0
1 2 3 4 5 6 SUPPLY VOLTAGE (V)
7
0.0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
Output Voltage vs. Output Current
SHORT CIRCUIT CURRENT (mA) 4.0 OUTPUT VOLTAGE (V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 50 100 150 200 OUTPUT CURRENT (mA) CIN = 10F COUT = 1F 160 140 120 100 80 60 40 20 0 0
Short Circuit Current vs. Input Voltage
OUTPUT VOLTAGE (V)
Output Voltage vs. Temperature
4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 3 DEVICES HI / AVG / LO CURVES APPLICABLE AT 100A AND 50mA CIN = 10F COUT = 1F
CIN = 10F COUT = 1F
1
2 3 4 5 6 INPUT VOLTAGE (V)
7
2.4 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
Short Circuit Current vs. Temperature
200 OUTPUT CURRENT (mA) 180 160 140 120 100 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) CIN = 10F COUT = 1F
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Load Transient
OUTPUT (mA) OUTPUT (mV)
Load Transient
OUTPUT (mA) OUTPUT (mV)
200 0 -200 100 -400 50 0 -50 -1 0 1 2345 TIME (ms) 6 7 8 COUT = 1F VIN = VOUT + 1
100 0 -100 100 -200 50 0 -50 -5 0 5 10 TIME (ms) 15 20 COUT = 10F VIN = VOUT + 1
Line Transient (MIC5211-3.3)
OUTPUT (V) CL = 1F IL = 1mA
OUTPUT (V)
Line Transient (MIC5211-3.3)
2 1 0 8 -1
INPUT (V)
3 2 1 0 -1 8 -2
CL = 11F IL = 1mA
INPUT (V)
6 4 2 -0.2 0.0 0.2 0.4 0.6 TIME (ms) 0.8 1.0
6 4 2 -0.2 0.0 0.2 0.4 0.6 TIME (ms) 0.8 1.0
Ripple Voltage vs. Frequency
100 100
Ripple Voltage vs. Frequency
100
Ripple Voltage vs. Frequency
RIPPLE VOLTAGE (dB)
RIPPLE VOLTAGE (dB)
80 60 40 20 0
RIPPLE VOLTAGE (dB)
80 60 40 20 0
80 60 40 20 0
IL = 100A CL = 1F VIN = VOUT + 1
IL = 1mA CL = 1F VIN = VOUT + 1
IL = 50mA CL = 1F VIN = VOUT + 1
10x100
100x100
1x103
10x103
100x103
1x106
10x100
100x100
1x103
10x103
100x103
1x106
10x100
100x100
1x103
10x103
100x103
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
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1x106
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Output Impedance
1000
OUTPUT IMPEDANCE ()
Enable Characteristics (MIC5211-3.3)
OUTPUT (V) OUTPUT (V) 4.0 3.0 2.0 1.0 0.0 4 -1.0 ENABLE (V) 2 0 -2 -2 0 2 4 6 TIME (s) 8 10 ENABLE (V) CL = 1F IL = 100A 5 4 3 2 1 0 4 -1 2 0
Enable Characteristics (MIC5211-3.3)
100 10 1 0.1
IL = 100A IL = 1mA
CL = 1F IL = 100A
IL = 50mA
1x100
1x103
10x100
100x100
10x103
100x103
1x106
0.01
-2 -0.2 0.0
FREQUENCY (Hz)
0.2 0.4 0.6 TIME (ms)
0.8
1.0
3.5 MIN. SUPPLY VOLTAGE (V)
Minimum Supply Voltage vs. Temperature
1.50
ENABLE VOLTAGE (mV) IL = 1mA VOUT = 3.3V
Enable Voltage vs. Temperature
40
ENABLE CURRENT (A)
Enable Current vs. Temperature
CIN = 10F COUT = 1F IL = 1mA
1.25
CIN = 10F COUT = 1F IL = 1mA
30
3.4
1.00 VOFF 0.75
VON
20 VEN = 2V
VEN = 5V
CIN = 10F COUT = 1F 3.3 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
10
0.50 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
Crosstalk Characteristic
VOUTA (50mV/div.)
IOUTA (50mA/div.)
VOUTB (50mV/div.)
IOUTB = 100A COUTB = 0.47F COUTA = 0.47F
TIME (25ms/div.)
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PD(max) = TJ(max) - TA JA
Applications Information
Enable/Shutdown ENA and ENB (enable/shutdown) may be controlled separately. Forcing ENA/B high (>2V) enables the regulator. The enable inputs typically draw only 15A. While the logic threshold is TTL/CMOS compatible, ENA/B may be forced as high as 20V, independent of VIN. ENA/B may be connected to the supply if the function is not required. Input Capacitor A 0.1F 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 when a battery is used as the input. Output Capacitor Typical PNP based regulators require an output capacitor to prevent oscillation. The MIC5211 is ultrastable, requiring only 0.1F of output capacitance per regulator for stability. The regulator is stable with all types of capacitors, including the tiny, low-ESR ceramic chip capacitors. The output capacitor value can be increased without limit to improve transient response. The capacitor should have a resonant frequency above 500kHz. Ceramic capacitors work, but some dielectrics have poor temperature coefficients, which will affect the value of the output capacitor over temperature. Tantalum capacitors are much more stable over temperature, but typically are larger and more expensive. Aluminum electrolytic capacitors will also work, but they have electrolytes that freeze at about -30C. Tantalum or ceramic capacitors are recommended for operation below -25C. No-Load Stability The MIC5211 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 Shutdown Thermal shutdown is independent on both halves of the dual MIC5211, however, an overtemperature condition in one half may affect the other half because of proximity. Thermal Considerations When designing with a dual low-dropout regulator, both sections must be considered for proper operation. The part is designed with thermal shutdown, therefore, the maximum junction temperature must not be exceeded. Since the dual regulators share the same substrate, the total power dissipation must be considered to avoid thermal shutdown. Simple thermal calculations based on the power dissipation of both regulators will allow the user to determine the conditions for proper operation. The maximum power dissipation for the total regulator system can be determined using the operating temperatures and the thermal resistance of the package. In a minimum footprint configuration, the SOT-23-6 junction-to-ambient thermal resistance (JA) is 220C/W. Since the maximum junction temperature for this device is 125C, at an operating temperature of 25C the maximum power dissipation is: November 2000 7
PD(max) =
125C - 25C 220C/W
PD(max) = 455mW The MIC5211-3.0 can supply 3V to two different loads independently from the same supply voltage. If one of the regulators is supplying 50mA at 3V from an input voltage of 4V, the total power dissipation in this portion of the regulator is:
PD1 = VIN - VOUT IOUT + VIN IGND
PD1 = (4V - 3V) 50mA + 4V 0.85mA
(
)
PD1 = 53.4mW
Up to approximately 400mW can be dissipated by the remaining regulator (455mW - 53.4mW) before reaching the thermal shutdown temperature, allowing up to 50mA of current.
PD2 = VIN - VOUT IOUT + VIN IGND
(
)
PD2 = (4V - 3V) 50mA + 4V 0.85mA
PD2 = 53.4mW
The total power dissipation is:
PD1 + PD2 = 53.4mW + 53.4mW
PD1 + PD2 = 106.8mW
Therefore, with a supply voltage of 4V, both outputs can operate safely at room temperature and full load (50mA).
VIN MIC5211 IN ENB OUTA GND VOUTA VOUTB 1F 1F ENA OUTB
Figure 1. Thermal Conditions Circuit In many applications, the ambient temperature is much higher. By recalculating the maximum power dissipation at 70C ambient, it can be determined if both outputs can supply full load when powered by a 4V supply.
PD(max) = TJ(max) - TA JA
PD(max) =
125C - 70C 220C/W
PD(max) = 250mW At 70C, the device can provide 250mW of power dissipation, suitable for the above application. When using supply voltages higher than 4V, do not exceed the maximum power dissipation for the device. If the device MIC5211
MIC5211
is operating from a 7.2V-nominal two-cell lithium-ion battery and both regulators are dropping the voltage to 3.0V, then output current will be limited at higher ambient temperatures. For example, at 70C ambient the first regulator can supply 3.0V at 50mA output from a 7.2V supply; however, the second regulator will have limitations on output current to avoid thermal shutdown. The dissipation of the first regulator is: PD1 = (7.2V - 3V) 50mA + 7.2V 0.85mA
Micrel
considerations must be taken to ensure proper functionality of the part. The input voltage must be high enough for the 5V section to operate correctly, this will ensure the 3.3V section proper operation as well. Both regulators live off of the same input voltage, therefore the amount of output current each regulator supplies may be limited thermally. The maximum power the MIC5211 can dissipate at room temperature is 455mW, as shown in the "Thermal Considerations" section. If we assume 6V input voltage and 50mA of output current for the 3.3V section of the regulator, then the amount of output current the 5V section can provide can be calculated based on the power dissipation. PD = (VGND - VOUT) IOUT + VGND * IGND PD(3.3V) = (6V - 3.3V) 50mA + 6V * 0.85mA PD(3.3V) = 140.1mW PD(max) = 455mW PD(max) - PD(3.3V) = PD(5V) PD(5V) = 455mW - 140.1mW PD(5V) = 314.9mW Based on the power dissipation allowed for the 5V section, the amount of output current it can source is easily calculated. PD(5V) = 314.9mW 314.9mW = (6V - 5V) IMAX - 6V * IGND (IGND typically adds less than 5% to the total power dissipation and in this case can be ignored) 314.9mW = (6V - 5V) IMAX IMAX = 314.9mA IMAX exceeds the maximum current rating of the device. Therefore, for this condition, the MIC5211 can supply 50mA of output current from each section of the regulator.
PD1 = 216mW
Since maximum power dissipation for the dual regulator is 250mW at 70C, the second regulator can only dissipate up to 34mW without going into thermal shutdown. The amount of current the second regulator can supply is: PD2(max) = 34mW
(7.2V - 3V) IOUT2(max) = 34mW
4.2V IOUT2(max) = 34mW
IOUT2(max) = 8mA
The second regulator can provide up to 8mA output current, suitable for the keep-alive circuitry often required in handheld applications. Refer to Application Hint 17 for heat sink requirements when higher power dissipation capability is needed. Refer to Designing with Low Dropout Voltage Regulators for a more thorough discussion of regulator thermal characteristics. Dual-Voltage Considerations For configurations where two different voltages are needed in the system, the MIC5211 has the option of having two independent output voltages from the same input. For example, a 3.3V rail and a 5.0V rail can be supplied from the MIC5211 for systems that require both voltages. Important
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Package Information
1.90 (0.075) REF 0.95 (0.037) REF
1.75 (0.069) 3.00 (0.118) 1.50 (0.059) 2.60 (0.102)
DIMENSIONS: MM (INCH) 3.00 (0.118) 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-23-6 (M6)
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MIC5211
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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
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