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MIC59150
Ultra High Speed 1.5A LDO
General Description
The MIC59150 is a high-bandwidth, low-dropout, 1.5A linear voltage regulator ideal for powering core voltages of low-power microprocessors. The MIC59150 implements a dual supply configuration allowing for a very low output impedance and a very fast transient response. The MIC59150 requires a bias input supply and a main input supply, allowing for ultra-low input voltages on the main supply rail. The device operates from an input supply of 1.0V to 3.8V and bias supply between 3V and 5.5V. The MIC59150 offers adjustable output voltages down to 0.5V. The MIC59150 requires a minimum output capacitance for stability, working optimally with small ceramic capacitors. The MIC59150 is available in an 8-pin EPAD SOIC package and its junction temperature range is -40C to +125C. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* Input voltage range: - VIN = 1.0V to 3.8V - VBIAS = 3.0V to 5.5V * Stable with 1F ceramic capacitor * Maximum dropout voltage of 250mV over temperature * Adjustable output voltage down to 0.5V * Ultra fast transient response * Excellent line and load regulation specifications * Logic controlled shutdown option * Thermal shutdown and current limit protection * Junction temperature range: -40C to +125C * 8-pin EPAD SOIC
Applications
* * * * * * * Telecommunications processors Graphics processors Computer peripheral cards Logic IC power supply SMPS post regulators Microprocessors Digital TV's
_________________________________________________________________________________________________________
Typical Application
MIC59150YME VIN CIN=1F (Ceramic) VIN VOUT R1 VBIAS CBIAS=1F (Ceramic) EN GND ADJ R2 COUT=1F (Ceramic) VOUT
VBIAS EN
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.
MIC59150
Ordering Information
Part Number MIC59150YME
Note: 1. Other Voltage available. Contact Micrel for detail.
Voltage(1) Adj.
Junction Temperature Range -40C to +125C
Package 8-Pin EPAD SOIC
Lead Finish RoHS Compliant
Pin Configuration
EN 1 VBIAS 2 VIN 3 VOUT 4 8 GND 7 ADJ 6 VIN 5 VOUT
8-Pin EPAD SOIC (ME)
Pin Description
Pin Number 1 2 3, 6 4, 5 7 8 Pin Name EN VBIAS VIN VOUT ADJ GND Pin Function Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. Input bias voltage for powering all circuitry on the regulator with the exception of the output power device. Input voltage needed for the output power device. Regulator Output. Adjustable regulator feedback input. Connect to resistor voltage divider. Ground.
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) ........................................ -0.3V to +4V Bias Supply Voltage (VBIAS)............................. -0.3V to +6V Enable Input Voltage (VEN)............................. -0.3V to VBIAS Power Dissipation .....................................Internally Limited Storage Temperature (Ts) .........................-65C to +150C ESD Rating(3) ................................................................+3kV
Operating Ratings(2)
Supply Voltage (VIN)............................................ 1V to 3.8V Bias Supply Voltage (VBIAS)................................. 3V to 5.5V Enable Input Voltage (VEN).................................. 0V to VBIAS Junction Temperature (TJ) ..................-40C TJ +125C Package Thermal Resistance EPAD SOIC (JA) ...............................................41C/W
Electrical Characteristics(4)
TA = 25C with VBIAS = VOUT + 2.2V; VIN = VOUT + 1V; bold values indicate 0C TJ 85C, unless otherwise specified.
Parameter Line Regulation (VIN) Line Regulation (VBIAS) Feedback Voltage (Adjustable Output Voltage) Output Voltage Load Regulation VIN - VOUT; Dropout Voltage VBIAS - VOUT; Dropout Voltage VBIAS supply current VBIAS shutdown current VIN shutdown current FB bias current UVLO Current Limit Enable Input Enable Input Threshold Enable Pin Input Current AC Response Large signal bandwidth PSRR (BIAS) at 10kHz PSRR (IN) at 10kHz Thermal Shutdown Thermal Shutdown Hysteresis Turn-on Time
Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Specification for packaged product only.
Condition VIN = VOUT + 1V to 3.8V, ILOAD = 10mA VBIAS = 3V to 5.5V (VOUT < 0.8V), ILOAD = 10mA VBIAS = VOUT + 2.2V to 5.5V (VOUT 0.8V), ILOAD = 10mA Room temperature Over temperature range IL = 10mA to 1.5A IL = 750mA IL = 1.5A IL = 1.5A VEN = 2V, IL = 100mA VEN = 2V, IL = 1.5A VEN = 0V VEN = 0V VBIAS rising Hysteresis VOUT = 0V Regulator enable Regulator shutdown Independent of state
Min
Typ 0.002 0.026
Max 0.1 0.3 0.505 0.510 0.5 150 250 2.1 7.5 75 1 1 1 3.0 6.0
Units %/V %/V V V % mV mV V mA mA A A A V mV A V V A MHz dB dB dB C C
0.495 0.490
0.5 0.5 0.1 65 100 0.85 1.3 12.5 0.02 0.04 0.03
2.7 1.8 1.6
2.84 100 3.1 0.85 0.75 0.012 1
0.3 1
VBIAS = 3.3V, IOUT = 750mA VIN = VOUT + 1V, IOUT = 750mA VIN = VOUT + 0.3V, IOUT = 750mA
46 60 55 145 12 85 300
s
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Typical Characteristics
80 70 60 PSRR (dB)
PSRR (dB)
Power Supply Rejection Ratio (VIN)
90 80 70 60 50 40
Power Supply Rejection Ratio (VBIAS)
DROPOUT VOLTAGE (mV)
160 140 120 100 80 60 40 20 0 0.75
Dropout Voltage (VIN)
50 40 30 V = 3.3V BIAS 20 VIN = 1.8V 10
VOUT = 1V IOUT = 0.75A
30 VBIAS = 3.3V VIN = 1.8V 20 10
VOUT = 1V IOUT = 0.75A
VBIAS = 3.3V VOUT = 1V
0 0.01
0.1 1 10 100 FREQUENCY (kHz)
1000
0 0.01
0.1 1 10 100 FREQUENCY (kHz)
1000
1 1.25 OUTPUT CURRENT (A)
1.5
1.2 DROPOUT VOLTAGE (V) 1 0.8 0.6 0.4 0.2 0 0
Dropout Voltage (VBIAS)
DROPOUT VOLTAGE (mV)
160 140 120 100 80 60 40 20
Dropout Voltage vs. Temperature (VIN)
DROPOUT VOLTAGE (V)
1.2 1 0.8 0.6 0.4 0.2 -40
Dropout Voltage vs. Temperature (VBIAS)
VIN = 3V VOUT = 2.5V
VBIAS = 5.5V VOUT = 3.45V IOUT = 1.5A
VIN = 3.8V VOUT = 3.45V IOUT = 1.5A
0.2 0.4 0.6 0.8 1 1.2 1.4 OUTPUT CURRENT (A)
0
-40
-20
-20
20
40
60
80
0
20
40
60
100
120
80
100 100
TEMPERATURE (C)
TEMPERATURE (C)
3 OUTPUT VOLTAGE (V) 2.5 2 1.5 1 0.5 0 0
Dropout Characteristics (VBIAS)
OUTPUT VOLTAGE (V)
10mA 1.5A
Load Regulation
1.005 1.004 1.003 1.002 1.001 1 0.999 0.998 0.997 0.996 0.995 0 30 BIAS CURRENT (mA) 25 20 15 10 5 -40 0
I
OUT
Bias Current vs. Temperature
VBIAS = 3V I
OUT
=0.75A
VIN = 1.5V VOUT = 0.5V IOUT=1.5A
VIN = 3V VOUT = 2.5V
VBIAS = 3.3V VIN = 1.5V VOUT = 1V
=100mA
-20
20
40
60
80
TEMPERATURE (C)
20 BIAS CURRENT (mA) 16 12 8 4 0 0
Bias Current vs. Output Current
GROUND CURRENT (mA)
0.6 0.5 0.4 0.3 0.2 0.1 0 3
Ground Current vs. Bias Voltage
FEEDBACK VOLTAGE (V)
0.502
Feedback Voltage vs. Input Voltage
0.501
0.5
VBIAS = 3.3V VIN = 1.5V VOUT = 1V
0.499
VIN = 1.8V VOUT = 1V
VBIAS = 3.3V VOUT = 1V
0.2 0.4 0.6 0.8 1 1.2 1.4 OUTPUT CURRENT (A)
3.5 4 4.5 5 BIAS VOLTAGE (V)
5.5
0.498 1.5
1.9 2.3 2.7 3.1 3.5 INPUT VOLTAGE (V)
3.9
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120
1
2 3 4 BIAS VOLTAGE (V)
5
0.2 0.4 0.6 0.8 1 1.2 1.4 OUTPUT CURRENT (A)
0
120
0
0
Micrel, Inc.
MIC59150
Typical Characteristics (continued)
0.505 FEEDBACK VOLTAGE (V) 0.504 0.503 0.502 0.501 0.5 0.499 0.498 0.497 0.496 0.495 3
VIN = 1.8V VOUT = 1V
Feedback Voltage vs. Bias Voltage
FEEDBACK VOLTAGE (V)
-40
-20
0
20
40
60
80
3.5 4 4.5 5 BIAS VOLTAGE (V)
100
TEMPERATURE (C)
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5
120
5.5
0.51 0.508 0.506 0.504 0.502 0.5 0.498 0.496 0.494 0.492 0.49
FeedbackVoltage vs. Temperature
ENABLE THRESHOLD (V)
1.2 1 0.8 0.6 0.4 0.2 0 3
Enable Threshold vs. Bias Voltage
VBIAS = 3.3V VIN = 1.5V
VIN = 1.8V VOUT = 1V
3.5 4 4.5 5 BIAS VOLTAGE (V)
5.5
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MIC59150
Functional Characteristics
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MIC59150
Functional Diagram
VBIAS VIN
EN
Enable
Bandgap
ADJ Ilimit VOUT
MIC59150 Block Diagram
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MIC59150 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" 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. 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)
Application Information
The MIC59150 is an ultra-high performance, low-dropout linear regulator designed for high current applications requiring a fast transient response. The MIC59150 utilizes two input supplies, significantly reducing dropout voltage, making it perfect for low-voltage, DC-to-DC conversion. The MIC59150 requires a minimum number of external components, and as a Cap regulator, the output is tolerant of virtually any type of capacitor, including ceramic type and tantalum type capacitors. The MIC59150 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 MIC59150. VBIAS requires approximately 12mA for a 1.5A load current. Dropout conditions require higher currents. Most of the biasing current is used to supply the base current to the pass transistor. This allows the pass element to be driven into saturation, reducing the dropout to 100mV at a 1.5A load current. 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. Good bypass techniques typically include one larger capacitor such as 1F ceramic and smaller valued capacitors such as 0.01F or 0.001F in parallel with that larger capacitor to decouple the bias supply. The VBIAS input voltage must be 2.1V above the output voltage with a minimum VBIAS input voltage of 3V. Input Supply Voltage VIN provides the high current to the collector of the pass transistor. The minimum input voltage is 1.0V, allowing conversion from low voltage supplies. Output Capacitor The MIC59150 requires a minimum of output capacitance to maintain stability. However, proper capacitor selection is important to ensure desired transient response. The MIC59150 is specifically designed to be stable with virtually any capacitance value and ESR. A 1F ceramic chip capacitor should satisfy most applications. Output capacitance can be increased without bound. See the "Functional Characteristics" subsection for examples of load transient response. X7R dielectric 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 December 2008 8
* Ground current (IGND) First, calculate the power dissipation (PD) of the regulator from these numbers and the device parameters from this datasheet.
PD = VIN x I IN + VBIAS x I BIAS - VOUT x I OUT
The input current will be less than the output current at high output currents as the load increases. The bias current is a sum of base drive and ground current. Ground current is constant over load current. Then the heat sink thermal resistance is determined with this formula:
SA =
TJ ( MAX ) - T A - ( JC + CS ) PD
The heat sink may be significantly reduced in applications where the maximum input voltage is known and 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 the MIC59150 allow significant reductions in regulator power dissipation and the associated heat sink without compromising
M9999-121808-A
Micrel, Inc. performance. When this technique is employed, a capacitor of at least 1F is needed directly between the input and regulator ground. Refer to "Application Note 9" (http://www.micrel.com/_PDF/App-Notes/an-9.pdf) for further details and examples on thermal design and heat sink specification. Minimum Load Current The MIC59150, unlike most other high current regulators, does not require a minimum load to maintain output voltage regulation. Adjustable Regulator Design The MIC59150 adjustable version allows programming the output voltage anywhere between 0.5Vand 3.5V. Two resistors are used. The resistor value between VOUT and the adjust pin should not exceed 10k. Larger
MIC59150 values can cause instability. The resistor values are calculated by:
V R1 = R 2 x OUT - 1 0. 5
where VOUT is the desired output voltage. Enable An active high enable input (EN) allows on-off control of the regulator. Current drain reduces to "zero" when the device is shutdown, with only microamperes of leakage current. The EN input has CMOS compatible thresholds for simple logic interfacing. EN may be directly tied to VBIAS and pulled up to the maximum supply voltage.
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MIC59150
J1 VIN 1V to 3.8V J2 GND J3 VBIAS 3V to 5.5V
U1 MIC59150YME C1 1uF/6.3V
3 6
VIN VIN
VOUT VOUT
4 5
J4 VOUT R1 1K C3 1uF/6.3V J5 GND
C4 OPEN
C2 1uF/6.3V
1
2
VBIAS EN GND
8
ADJ
7
JP1
3
2
1
R2 1K A 2 JP2
R3 698 B 4
R4 499 C 6
R5 383 D 8 7
JP2 = Voltages Selector A VOUT = 1.0V B VOUT = 1.2V C VOUT = 1.5V D VOUT = 1.8V
1
3
Bill of Materials
Item C1,C2 C3 C4 R1,R2 R3 R4 R5 U1
Notes: 1. TDK: www.tdk.com 2. Murata Tel: www.murata.com 3. AVX Tel: www.avx.com 4. Vishay Tel: www.vishay.com 5. Micrel, Inc.: www.micrel.com
Part Number C1608X5R0J105K GRM188R60J105KA01D 0603D105KAT2A CRCW06031K00FKXX CRCW0603698RFKXX CRCW0603499RFKXX CRCW0603383RFKXX MIC59150YME
Manufacturer TDK
(1)
Description 1uF Ceramic Capacitor X5R 0603 6.3V
5
Qty. 3
Murata(2) AVX(3) Open Vishay
(4)
1 2 1 1 1 1
1k 1% 0603 Resistor 698 1% 0603 Resistor 499 1% 0603 Resistor 383 1% 0603 Resistor Ultra High Speed 1.5A LDO
Vishay(4) Vishay Vishay
(4) (4)
Micrel, Inc.(5)
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MIC59150
PCB Layout Recommendations
Top Layer
Bottom Layer
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Package Information
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) 2008 Micrel, Incorporated.
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