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MIC47100
1A High Speed Low VIN LDO
General Description
The MIC47100 is a high speed, Low VIN LDO capable of delivering up to 1A and designed to take advantage of point of load applications that use multiple supply rails to generate a low voltage, high current power supply. The MIC47100 is stable with only a 1F ceramic output capacitor and is available in a thermally enhanced 2mm x 2mm MLF(R) package thus making it an optimal solution for board-constrained applications. The MIC47100 has an NMOS output stage offering very low output impedance. The NMOS output stage offers a unique ability to respond very quickly to sudden load changes such as that required by a microprocessor, DSP or FPGA. The MIC47100 consumes little quiescent current and therefore can be used for driving the core voltages of mobile processors, post regulating a core DC/DC converter in any portable device. The MIC47100 is available in fixed and adjustable output voltages in the exposed pad MSOP-8 package and the tiny 2mm x 2mm MLF(R) package with an operating junction temperature range of -40C to +125C. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* Operating voltage range: - Input Supply: 1.0V to 3.6V - Bias Supply: 2.3V to 5.5V * 0.8V to 2.0V output voltage range * High bandwidth - very fast transient response * PSRR >50dB at 100kHz * Stable with a 1F ceramic output capacitor * Low dropout voltage of 80mV at 1A * High output voltage accuracy: - +/- 1.5% initial accuracy - +/- 2% over temperature * Logic level enable input * UVLO on both supply voltages for easy turn-on * ePad MSOP-8 - small form factor power package * Thermally enhanced 2mm x 2mm MLF(R) - smallest solution
Applications:
* * * * Point of Load PDAs DSP, PLD and FPGA Power Supply Low Voltage Post Regulation
___________________________________________________________________________________________________________
Typical Application
MicroLead Frame and MLF are registered trademark of Amkor Technology 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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Micrel, Inc.
MIC47100
Ordering Information
Part Number MIC47100YML MIC47100-0.8YML MIC47100-1.0YML MIC47100-1.2YML MIC47100YMME MIC47100-0.8YMME MIC47100-1.0YMME MIC47100-1.2YMME
Note: 1. Other Voltage available. Contact Micrel for details.
Nominal Output (1) Voltage ADJ 0.8V 1.0V+ 1.2V+ ADJ 0.8V 1.0V+ 1.2V+
Marking Code EAA E08 E10 E12 ZEAAY ZE08Y ZE10Y ZE12Y
Lead Finish Pb free Pb free Pb free Pb free Pb free Pb free Pb free Pb free
Package 2x2 MLF8 2x2 MLF8 2x2 MLF8 2x2 MLF8 MSOP-8 w/ ePad MSOP-8 w/ ePad MSOP-8 w/ ePad MSOP-8 w/ ePad
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MIC47100
Pin Configuration
8-pin 2mm x 2mm MLF Fixed and Adjustable (ML)
(R)
8-pin Exposed Pad MSOP Fixed and Adjustable (MME)
Pin Description
Pin Number MLF 1,2 3 4 5 6 (Fixed) 6 (Adj) 7,8 Pin Number MSOP 1,2 3 4 5 6 (Fixed) 6 (Adj) 7,8 IN GND BIAS EN FB ADJ OUT Input Supply. Drain of NMOS pass transistor which is the power input voltage for regulator. The NMOS pass transistor steps down this input voltage to create the output voltage. Ground. Ground pins and exposed pad must be connected externally. Bias Supply. The bias supply is the power supply for the internal circuitry of the regulator. Enable: TTL/CMOS compatible input. Logic high = enable, logic low or open = shutdown Feedback Input. Connect to OUT. Optimum load regulation is obtained when feedback is taken from the actual load point. Adjust Input. Connect external resistor divider to program output voltage. Output. Output Voltage of Regulator Pin Name Pin Name
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MIC47100
Absolute Maximum Ratings(1)
Input Supply Voltage (VIN).................................... 0V to +4V Bias Supply Voltage (VBIAS).................................. 0V to +6V Enable Voltage (VEN)............................................ 0V to +6V Power Dissipation, Internally Limited (3) Lead Temperature (soldering, #sec.)......................... 260C Storage Temperature (Ts) ..........................-65C to +150C ESD Rating (4) ................................................................. 2kV
Operating Ratings(2)
Input Supply Voltage (VIN).............................. 1.0V to +3.6V Bias Supply Voltage (VBIAS)............................ 2.3V to +5.5V Enable Input Voltage (VEN).................................. 0V to VBIAS Junction Temperature (TJ) ........................ -40C to +125C Junction Thermal Resistance ePad MSOP-8 (JA) ...........................................64C/W 2mm x 2mm MLF(R) (JA).....................................90C/W
Electrical Characteristics(5)
VIN = VOUT+0.5V; VBIAS = VOUT + 2.1V, IOUT = 100A; TA = 25C, bold values indicate -40C< TA < +125C, unless noted.
Parameter Condition
(6)
Min
Typ
Max
Units
UVLO Thresholds UVLO Hysteresis Output Voltage Accuracy
Bias Supply Input Supply VBIAS VIN Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VBIAS = VOUT + 2.1V to 5.5V
1.9 0.7
2.1 0.85 70 25
2.3 1.0
V mV
-1.5 -2.0 -0.1 0.015
+1.5 +2.0 0.1
% % %/V
Output Voltage Line Regulation (Bias Supply) Output Voltage Line Regulation (Input Supply) Load Regulation Input Supply Dropout Voltage Bias Supply Dropout Voltage Ground current from VBIAS Shutdown current from VBIAS Ground current from VIN Shutdown current from VIN
VIN = VOUT + 0.5V to 3.6V
-0.05
0.005
0.05
%/V
IOUT = 10mA to 1A IOUT = 100mA; IOUT = 500mA; IOUT = 1A; IOUT = 100mA; IOUT = 500mA; IOUT = 1A IOUT = 1mA IOUT = 1A EN < 0.2V IOUT = 1A EN < 0.2V
0.2 8.5 37 80 1.15 1.25 1.35 350 350 0.1 6 0.1
0.5 50 250
% mV mV mV V V V A A A A
2.1 500 500 1.0
1.0
A
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Micrel, Inc. Ripple Rejection f = 1kHz; COUT = 1.0F; IOUT = 100mA f = 100kHz; COUT = 1.0F; IOUT = 100mA f = 500kHz; COUT = 1.0F; IOUT = 100mA VIN = 2.7V; VOUT = 0V COUT=1F; 10Hz to 100kHz; IOUT = 100mA 1.1 80 55 45 1.6 63
160 20
MIC47100 dB dB dB 2.5 A VRMS
C C
Current Limit Output Voltage Noise
Over-temperature Shutdown Over-temperature Shutdown Hysteresis Enable Inputs
Enable Voltage Enable Input Current Turn-on Time Reference Voltage ADJ pin Input current
Notes:
Logic Low Logic High VIL < 0.2V VIH = 1.2V COUT = 1F; 90% of typical VOUT 0.69 0.686 1.0 1 6 35 0.7 20
0.2
V V A A s V V nA
500 0.71 0.714
Reference Voltage (Adjustable Option Only)
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. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 5. Specification for packaged product only. 6. Both UVLO thresholds must be met for the output voltage to be allowed to turn-on. If either of the two input voltages are below the UVLO thresholds, the output is kept off.
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MIC47100
Typical Characteristics
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MIC47100
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MIC47100
Functional Characteristics
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MIC47100
Functional Diagram
MIC47100 Block Diagram
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MIC47100 performance at a minimum of space. Additional highfrequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out highfrequency noise and are good practice in any RFbased circuit. Minimum Load Current The MIC47100, unlike most other regulators, does not require a minimum load to maintain output voltage regulation. Adjustable Regulator Design The MIC47100 adjustable version allows programming the output voltage anywhere between 0.8V and 2.0V. Two resistors are used. The R1 resistor value between VOUT and the adjust pin should not exceed 10k. Larger values can cause instability. R2 connects between the adjust pin and ground. The resistor values are calculated by:
Applications Information
The MIC47100 is a high speed, dual supply NMOS LDO designed to take advantage of point-of-load applications that use multiple supply rails to generate a low voltage, high current power supply. The MIC47100 can source 1A of output current while only requiring a 1F ceramic output capacitor for stability. The MIC47100 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown.
Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC47100. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. Small ceramic capacitors from VBIAS-to-ground help reduce high frequency noise from being injected into the control circuitry from the bias rail and are good design practice. Input Supply Voltage VIN provides the supply to power the LDO. The minimum input voltage is 1V, allowing conversion from low voltage supplies. Output Capacitor The MIC47100 requires an output capacitor of 1F or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1F ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by 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 capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. Input Capacitor The MIC47100 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1F capacitor is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal February 2008 10
V R1 = R2 x OUT - 1 0.7
Where VOUT is the desired output voltage. Enable/Shutdown The MIC47100 comes with a single active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a "zero" off-mode-current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Thermal Considerations The MIC47100 is designed to provide 1A of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 1.8V, the output voltage is 1.2V and the output current is 1A. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT1) IOUT + VBIAS IGND Because this device is CMOS, the ground current is insignificant for power dissipation and can be ignored for this calculation. PD = (1.8V - 1.2V) x 1A PD = 0.6W
M9999-022108-A (408) 944-0800
Micrel, Inc. To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation:
MIC47100
The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC47100-1.2YML at an input voltage of 1.8V and a 1A load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows:
(125C - TA ) (90C / W ) TA = 71C 0.6W = Therefore, a 1.2V application with 1A of output current can accept an ambient operating temperature of 71C in a 2mm x 2mm MLF(R) 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. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
PD(MAX) =

TJ(MAX) - TA
JA
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 90C/W. The table below shows junction-to-ambient thermal resistance for the MIC47100 in the MLF(R) package.
Package
JA Recommended Minimum Footprint 90C/W
JC
8-pin 2mm x 2mm
MLF(R)
2C/W
Thermal Resistance Substituting PD for PD(max) and operating temperature will operating conditions for the junction-to-ambient thermal minimum footprint is 90C/W. solving for the ambient give the maximum regulator circuit. The resistance for the
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MIC47100
Package Information
8-Pin 2mmx2mm MLF (ML)
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MIC47100
8-Pin e-Pad MSOP (MME)
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) 2008 Micrel, Incorporated.
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