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MIC5208
Micrel
MIC5208
Dual 50mA LDO Voltage Regulator
Preliminary Information
General Description
The MIC5208 is a dual linear voltage regulator with very low dropout voltage (typically 20mV at light loads and 250mV at 50mA), very low ground current (225A at 10mA output), and better than 3% initial accuracy. It also features individual logic-compatible enable/shutdown control inputs. Designed especially for hand-held battery powered devices, the MIC5208 can be switched by a CMOS or TTL compatible logic signal, or the enable pin can be connected to the supply input for 3-terminal operation. When disabled, power consumption drops nearly to zero. Dropout ground current is minimized to prolong battery life. Key features include current limiting, overtemperature shutdown, and protection against reversed battery. The MIC5208 is available in 3.0V, 3.3V, 3.6V, 4.0V and 5.0V fixed voltage configurations. Other voltages are available; contact Micrel for details.
Features
* * * * * * * * * * * Micrel Mini 8TM MSOP package Guaranteed 50mA output Low quiescent current Low dropout voltage Wide selection of output voltages Tight load and line regulation Low temperature coefficient Current and thermal limiting Reversed input polarity protection Zero off-mode current Logic-controlled electronic enable
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 MIC5208-3.0BMM MIC5208-3.3BMM MIC5208-3.6BMM MIC5208-4.0BMM MIC5208-5.0BMM Voltage 3.0 3.3 3.6 4.0 5.0 Accuracy 3% 3% 3% 3% 3% Junction Temp. Range* -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package 8-lead MSOP 8-lead MSOP 8-lead MSOP 8-lead MSOP 8-lead MSOP
Other voltages available. Contact Micrel for details.
Typical Application
MIC5208 Output A Output B 1F 1F
1 2 3 4 8 7 6 5
Enable A Enable B
Enable may be connected to VIN
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Pin Configuration
OUTA GND OUTB GND
1 2 3 4
8 7 6 5
INA ENA INB ENB
MIC5208BMM
Pin Description
Pin Number 1 2, 4 3 5 6 7 8 Pin Name OUTA GND OUTB ENB INB ENA INA Pin Function Regulator Output A Ground: Both pins must be connected together. Regulator Output B Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. Supply Input B Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. Supply Input A
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Absolute Maximum Ratings
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
Recommended Operating Conditions
Supply Input Voltage (VIN) ............................... 2.5V to 16V Enable Input Voltage (VEN) ................................. 0V to 16V Junction Temperature (TJ) ....................... -40C to +125C 8-lead MSOP (JA) ................................................... Note 1
Electrical Characteristics
VIN = VOUT + 1V; IL = 1mA; CL = 1F, and VEN 2.0V; TJ = 25C, bold values indicate -40C to +125C; for one-half of dual MIC5208; 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 4 Conditions variation from nominal VOUT Note 2 VIN = VOUT +1V to 16V IL = 0.1mA to 50mA, Note 3 IL = 100A IL = 20mA IL = 50mA VEN 0.4V (shutdown) VEN 2.0V (enabled), IL = 100A IL = 20mA IL = 50mA VIN = 0.5V less than designed VOUT, Note 5 VOUT = 0V Note 6 Min -3 -4 50 0.008 0.08 20 200 250 0.01 180 225 850 200 180 0.05 Typical Max 3 4 200 0.3 0.5 0.3 0.5 350 500 10 750 1200 300 250 Units % % ppm/C % % % % mV mV mV A A A A A mA %/W
IQ IGND
Quiescent Current Ground Pin Current Note 5 Ground Pin Current at Dropout Current Limit Thermal Regulation
IGNDDO ILIMIT VO/PD Control Input VIL VIH IIL IIH
General Note: Note 1:
Input Voltage Level Logic Low Logic High Control Input Current
shutdown enabled VIL 0.6V VIH 2.0V
0.6 2.0 0.01 15 1 50
V V A A
Devices are ESD protected, however, handling precautions are recommended.
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 rated operating conditions. 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: PMAX = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. JA of the 8-lead MSOP is 200C/W, mounted on a PC board. 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. 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 50mA load pulse at VIN = 16V for t = 10ms.
Note 2: Note 3: Note 4: Note 5: Note 6:
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Typical Characteristics
1000
Dropout Voltage vs. Output Current
400
Dropout Voltage vs. Temperature
4
Dropout Characteristics (MIC5208-3.3)
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
3
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
60 40 20 0 -20 -40 -60 100 50 0 OUTPUT (mV)
Thermal Regulation (MIC5208-3.3)
CIN = 10F COUT = 1F
LOAD (mA) 7
1
2 3 4 5 6 INPUT VOLTAGE (V)
CL = 1F -50 -2 0 2 4 6 8 10 12 14 16 TIME (ms)
Output Voltage vs. Temperature
4.0 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) 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 200 180 160 140 120
Short Circuit Current vs. Temperature
3.5 MIN. SUPPLY VOLTAGE (V)
Minimum Supply Voltage vs. Temperature
V 3.4
OUT
IL = 1mA = 3.3V
CIN = 10F COUT = 1F
CIN = 10F COUT = 1F 3.3 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
2.4 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
100 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
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Typical Characteristics
Output Impedance
OUTPUT (mA) OUTPUT (mV)
Load Transient
0 -200 100 -400 50 0 -50 -1 0 1 2345 TIME (ms) 6 7 8 COUT = 1F VIN = VOUT + 1
OUTPUT (mA) OUTPUT (mV)
Load Transient
100 0 -100 100 -200 50 0 -50 -5 0 5 10 TIME (ms) 15 20 COUT = 10F VIN = VOUT + 1
1000
200
OUTPUT IMPEDANCE ()
100 10 1 0.1
IL = 100A IL = 1mA
IL = 50mA
1x100
10x100
100x100
1x103
10x103
100x103
FREQUENCY (Hz)
Ripple Voltage vs. Frequency
OUTPUT (V)
1x106
0.01
Line Transient (MIC5208-3.3)
CL = 1F IL = 1mA
Line Transient (MIC5208-3.3)
OUTPUT (V)
2 1 0 8 -1 CL = 11F IL = 1mA
100
3 2 1 0 -1 8 -2
RIPPLE VOLTAGE (dB)
80 60 40 20 0 IL = 100A CL = 1F VIN = VOUT + 1
INPUT (V)
6 4 2 -0.2 0.0 0.2 0.4 0.6 TIME (ms) 0.8 1.0
INPUT (V)
6 4 2 -0.2 0.0 0.2 0.4 0.6 TIME (ms) 0.8 1.0
10x100
100x100
1x103
10x103
3
FREQUENCY (Hz)
Ripple Voltage vs. Frequency
100
100x10
1x106
Enable Characteristics (MIC5208-3.3)
OUTPUT (V) OUTPUT (V) 4.0 3.0 2.0 1.0 0.0 4 -1.0 ENABLE (V) CL = 1F IL = 100A 5 4 3 2 1 0 4 -1 2 0
Enable Characteristics (MIC5208-3.3)
RIPPLE VOLTAGE (dB)
80 60 40 20 0 IL = 1mA CL = 1F VIN = VOUT + 1
CL = 1F IL = 100A
2 0 -2 -2 0 2 4 6 TIME (s) 8 10
ENABLE (V)
10x100
100x100
1x103
10x103
1x106
FREQUENCY (Hz)
100x10
-2 -0.2 0.0
3
0.2 0.4 0.6 TIME (ms)
0.8
1.0
Ripple Voltage vs. Frequency
100
ENABLE VOLTAGE (mV)
Enable Voltage vs. Temperature
1.50
Enable Current vs. Temperature
40 ENABLE CURRENT (A) CIN = 10F COUT = 1F IL = 1mA
RIPPLE VOLTAGE (dB)
80 60 40 20 0 IL = 50mA CL = 1F VIN = VOUT + 1
1.25
CIN = 10F COUT = 1F IL = 1mA
30
1.00 VOFF 0.75 VON
20 VEN = 2V
VEN = 5V
10
10x100
100x100
1x103
10x103
FREQUENCY (Hz)
100x10
1x106
0.50 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
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No-Load Stability The MIC5208 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 MIC5208, however, an overtemperature condition in one half may affect the other half because of proximity. Thermal Considerations Multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. The MIC5208-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
Applications Information
Supply/Ground Both MIC5208 GND pins must be connected to the same ground potential. INA and INB can each be connected to a different supply. Enable/Shutdown ENA (enable/shutdown) and ENB may be enabled separately. Forcing ENA/B high (> 2V) enables the associated regulator. ENA/B requires a small amount of current, typically 15A. While the logic threshold is TTL/CMOS compatible, ENA/B may be forced as high as 20V, independent of VIN. 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 if a battery is used as the input. Output Capacitor An output capacitor is required between OUT and GND to prevent oscillation. 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 500kHz. 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 0.22F for current below 10mA or 0.1F for currents below 1mA.
MSOP Thermal Characteristics For additional heat sink characteristics, please refer to Micrel Application Hint 17, "Calculating P.C. Board Heat Sink Area For Surface Mount Packages".
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