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MIC69301/2/3
Single Supply VIN, Low VIN, Low VOUT, 3A LDO
General Description
Features
The MIC69301/2/3 is the 3A output current member of the * Input voltage range: VIN: 1.65V to 5.5V MIC69xxx family of high current, low voltage regulators, * Maximum dropout (VIN - VOUT) of 500mV which support currents of 1A, 1.5A, 3A, and 5A. This over temperature family operates from a single low voltage supply, yet offers * Adjustable output voltage down to 0.5V high precision and ultra low dropout of 500mV under worst * Stable with 10F ceramic output capacitor case conditions. * Excellent line and load regulation The MIC69301/2/3 operates from an input voltage of 1.65V * Logic controlled shutdown to 5.5V. It is designed to drive digital circuits requiring low voltage at high currents (i.e., PLDs, DSP, microcontroller, * Thermal shutdown and current-limit protection etc.). These regulators are available in adjustable and * 5-Pin TO-263 fixed output voltages. The adjustable version can support * 5-Pin S-Pak package output voltages down to 0.5V. * EPAD SOIC-8 package The Cap design of the MIC69301/2/3 is optimized for * -40C to +125C junction temperature range stability with low value low-ESR ceramic output capacitors. Features of the MIC69301/2/3 include thermal shutdown and current limit protection. Logic enable and error flag Applications pins are also available. * Point-of-load applications The MIC69301/2/3 is offered in TO-263, S-PAK and the * Industrial power EPAD SOIC-8 packages. All packages have an operating * Sensitive RF applications temperature range of -40C to +125C. Datasheets and support documentation can be found on Micrel's web site at: www.micrel.com. ___________________________________________________________________________________________________________
Typical Application
Fixed 1.2V Regulator w/Error Flag Output
Adjustable Regulator
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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MIC69301/2/3
Ordering Information
Part Number MIC69301-1.2YME MIC69301-1.2WR MIC69301-1.2WU MIC69302WR MIC69302WU MIC69303YME Nominal Output Voltage 1.2V 1.2V 1.2V Adj. Adj. Adj. Junction Temperature Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C Package 8-Pin e-Pad SOIC 5-Pin S-PAK 5-Pin TO-263 5-Pin S-PAK 5-Pin TO-263 8-Pin e-Pad SOIC Lead Finish Pb Free RoHS Compliant RoHS Compliant RoHS Compliant RoHS Compliant Pb Free
Pin Configuration
5-Pin TO-263 (U) (Adjustable Voltage)
5-Pin TO-263 (U) (Fixed Voltage with Flag)
5-Pin S-PAK (R) (Adjustable Voltage)
5-Pin S-PAK (R) (Fixed Voltage with Flag)
8-Pin e-Pad SOIC (ME) (Adjustable Voltage)
8-Pin e-Pad SOIC (ME) (Fixed Voltage with Flag)
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MIC69301/2/3
Pin Description
Pin Number (Fixed) SPAK-5 TO-263-5 1 2 3, TAB 4 -- -- 5 -- Pin Number (Adjustable) SPAK-5 TO-263-5 1 2 3, TAB 4 -- 5 -- -- Pin Number (Fixed) e-Pad SOIC-8 2 3,4 1 5,6 7 -- 8 EP Pin Number (Adjustable) e-Pad SOIC-8 2 3,4 1 5,6 -- 7 8 EP Pin Name Pin Function
EN IN GND OUT SNS ADJ FLG EP
Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. Do not leave pin floating. Input voltage which supplies current to the output power device. Ground (TAB is connected to ground on S-Pak and TO-263). Regulator Output. Output voltage sense. Connect to output voltage. Adjustable regulator feedback input. Connect to resistor voltage divider. Error Flag (Output): Open collector output. Active low indicates an output fault condition. Exposed pad. Connect to GND.
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN to GND) .................. -0.3V to +6V Logic Input Voltage (VEN to GND). .......-0.3V to (VIN + 0.3V) Power Dissipation (PD) ........................... Internally Limited(3) Flag ..................................................................................6V Storage Temperature (TS).........................-65C to +125C ESD(4) ............................................................................. 2kV
Operating Ratings(2)
Supply Voltage (VIN)....................................... 1.65V to 5.5V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) ..................-40C TJ +125C Package Thermal Resistance S-PAK-5 (JC).......................................................2C/W S-PAK-5 (JA).....................................................38C/W TO-263-5 (JC) .....................................................2C/W EPAD SOIC-8 (JA)............................................41C/W
Electrical Characteristics(4)
TA = 25C with VIN = VOUT + 1V; bold values indicate -40C< TJ < +125C; IOUT = 10mA; COUT = 10F ceramic, unless noted. Parameter Output Voltage Accuracy Output Voltage Line Regulation (Note 5) Output Voltage Load Regulation VIN - VO; Dropout Voltage (Note 6) Ground Pin Current Conditions Over temperature range VIN = VOUT +1.0V to 5.5V For VOUT 0.65V, VIN = 1.65V to 5.5V IOUT = 10mA to 3A IOUT = 1.5A IOUT = 3.0A IOUT = 10mA IOUT = 1.5A IOUT = 3.0A VEN = 0V VOUT = 0V VEN = VIN Min -2 Typ 0.2 0.3 200 275 1.2 12 32 1 5.2 10 165 0.57 0.2 0.005 7 0.05 150 7.5 10 2 0.25 14 1 Max +2 0.3 Units % %/V % mV mV mA mA mA A A s C V V A A A mV % % A
300 500 5 30 75
Ground Pin Current in Shutdown Current Limit Start-up Time Thermal Shutdown Enable Input Enable Input Threshold Enable Pin Input Current Flag Output IFLG(LEAK) VFLG(LO) VFLG Feedback Pin Current
Notes:
3.3
150
Regulator enable Regulator shutdown VIL 0.2V (Regulator shutdown) VIH 0.8V (Regulator enable) Flag Output Leakage Current (Flag Off) Output Logic-Low Voltage (under voltage condition), IOUT = 5mA Threshold, % of VOUT below nominal (falling) Hysteresis
0.8
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 of 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. 4. Specification for packaged product only. 5. Minimum input for line regulation test is set to VOUT + 1V relative to the highest output voltage. 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. For outputs below 1.65V, dropout voltage is considered the input-to-output voltage differential with the minimum input voltage of 1.65V. Minimum input operating voltage is 1.65V.
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MIC69301/2/3
Typical Characteristics
70 60 50 40 30 20 VIN = 3.3V 10 VOUT = 1.8V IOUT = 0.5A 0 1K 10K FREQUENCY (Hz)
Power Supply Rejection Ratio
300 250 200 150 100 50 0 0
Dropout Voltage vs. Output Current
1.4 1.2 1.0 0.8 0.6 0.4
Dropout Voltage vs. Input Voltage
500mA 1.5A 3A
VOUT = 1.2V COUT = 10F 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT (A) 3.0
0.2 0 0
VOUT = 1.2V COUT = 10F 0.5 1.0 1.5 2.0 INPUT VOLTAGE (V) 2.5
400 350 300 250 200 150 100 50 0
Dropout Voltage vs. Temperature
IOUT = 3A
35 30 25 20
Ground Current vs. Output Current
50 45 40 35 30 25
Ground Current vs. Temperature
IOUT = 3A
IOUT = 1.5A
15 10 VIN = 2.2V VOUT = 1.2V COUT = 10F 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT (A) 3
VOUT = 1.2V COUT = 10F 20 40 60 80 TEMPERATURE (C)
5 0 0
20 15 IOUT = 1.5A 10 VIN = 2.2V 5 VOUT = 1.2V COUT = 10F 0 20 40 60 80 TEMPERATURE (C)
1.220 1.215 1.210 1.205 1.200 1.195 1.190 1.185 1.180
Output Voltage vs. Temperature
7 6 5 4 3
Current Limit vs. Temperature
Load Regulation
1.300 1.275 1.250 1.225 1.200 1.175
VIN = 2.2V VOUT = 1.2V IOUT = 10mA COUT = 10F 20 40 60 80 TEMPERATURE (C)
2 1 0 VIN = 2.2V VOUT = 1.2V COUT = 10F 20 40 60 80 TEMPERATURE (C)
1.150 1.125 1.100 0
VIN = 2.2V VOUT = 1.2V COUT = 10F 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT (A) 3.0
1.0 0.9 0.8 0.7 0.6
Enable Threshold vs. Temperature
ON 0.5 OFF 0.4 0.3 V = 2.2V IN 0.2 VOUT = 1.2V 0.1 IOUT = 100mA COUT = 10F 0 20 40 60 80 TEMPERATURE (C)
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MIC69301/2/3
Functional Characteristics
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MIC69301/2/3
Functional Diagram
IN OUT
EN
ENABLE
VREF
50mV VREF
FLG
GND
Fixed Output Regulator
IN
OUT
EN
ENABLE
0.5V VREF ADJ
GND
Adjustable Output Regulator
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MIC69301/2/3 Minimum Load Current The MIC69301/2/3 regulator is specified between finite loads. If the output current is too small, leakage currents dominate and the output voltage rises. A 10mA minimum load current is necessary for proper operation. Adjustable Regulator Design The MIC69302 and MIC69303 adjustable version allows programming the output voltage anywhere between 0.5V and 5.5V with two resistors. The resistor value between VOUT and the adjust pin should not exceed 10k. Larger values can cause instability. The resistor values are calculated by:
R VOUT = 0.5 x 1 + 1 R 2
Application Information
The MIC69301/2/3 is an ultra-high performance low dropout linear regulator designed for high current applications requiring a fast transient response. It utilizes a single input supply and has a very low dropout voltage perfect for low-voltage DC-to-DC conversion. The MIC69301/2/3 requires a minimum number of external components. The MIC69301/2/3 regulator is fully protected from damage due to fault conditions offering constant current limiting and thermal shutdown. Input Supply Voltage VIN provides a high current to the collector of the pass transistor. The minimum input voltage is 1.65V allowing conversion from low voltage supplies. Output Capacitor The MIC69301/2/3 requires a minimum of output capacitance to maintain stability. However, proper capacitor selection is important to ensure desired transient response. The MIC69301/2/3 is specifically designed to be stable with low ESR ceramic chip capacitors. A 10F ceramic chip capacitor should satisfy most applications. Output capacitor can be increased without bound. See typical characteristics for examples of load transient response. X7R dielectric ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by only 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60%, respectively over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric the value must be much higher than an X7R ceramic or a tantalum capacitor to ensure the same capacitance value over the operating temperature range. Tantalum capacitors have a very stable dielectric (10% over their operating temperature range) and can also be used with this device. Input Capacitor An input capacitor of 1F or greater is recommended when the device is more than 4 inches away from the bulk supply capacitance or when the supply is a battery. Small, surface mount, ceramic chip capacitors can be used for the bypassing. The capacitor should be placed within 1 inch of the device for optimal performance. Larger values will help to improve ripple rejection by bypassing the input to the regulator further improving the integrity of the output voltage.
Where VOUT is the desired output voltage. Enable The fixed output voltage versions of the MIC69301 feature an active high enable input (EN) that allows onoff control of the regulator. Current drain reduces to near "zero" when the device is shutdown, with only microamperes of leakage current. EN may be directly tied to VIN and pulled up to the maximum supply voltage. Thermal Design Linear regulators are simple to use. The most complicated design parameters to consider are thermal characteristics. Thermal design requires the following application-specific parameters: * Maximum ambient temperature (TA) * Output current (IOUT) * Output voltage (VOUT) * Input voltage (VIN) * Ground current (IGND) First, calculate the power dissipation of the regulator from these numbers and the device parameters from this data sheet. PD = (VIN - VOUT) x IOUT + VIN x IGND where the ground current is approximated by using numbers from the "Electrical Characteristics" or "Typical Characteristics" sections. The heat sink thermal resistance is then determined with this formula: SA = ((TJ(max) - TA)/ PD) - (JC + CS) Where TJ(max) 125C and CS is between 0C and 2C/W.
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Micrel, Inc. The heat sink may be significantly reduced in applications where the minimum input voltage is known and is large compared with the dropout voltage. Use a series input resistor to drop excessive voltage and distribute the heat between this resistor and the regulator. The low dropout properties of Micrel Super eta PNP(R) regulators allow significant reductions in regulator power dissipation and the associated heat sink
MIC69301/2/3 without compromising performance. When this technique is employed, a capacitor of at least 1.0F is needed directly between the input and regulator ground. Refer to "Application Note 9" for further details and examples on thermal design and heat sink applications.
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Package Information
5-Pin S-PAK (R)
5-Pin TO-263 (U)
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MIC69301/2/3
8-Pin EPAD SOIC (ME)
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) 2010 Micrel, Incorporated.
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