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MIC5301
Single, 150mA Cap ULDOTM
General Description
The MIC5301 is a high performance, single output ultra low LDO (ULDOTM) regulator, offering low total output noise. The MIC5301 is capable of sourcing 150mA output current and offers high PSRR and low output noise, making it an ideal solution for RF applications. For battery operated applications, the MIC5301 offers 2% accuracy, extremely low dropout voltage (40mV @ 150mA), and low ground current (typically 85A total). The MIC5301 can also be put into a zero-off-mode current state, drawing no current when disabled. The MIC5301 is available in the 1.6mm x 1.6mm MLF(R) package, occupying only 2.56mm2 of PCB area, a 36% reduction in board area compared to SC-70 and 2mm x 2mm MLF(R) packages. The MIC5301 has an operating junction temperature range of -40C to +125C and is available in fixed and adjustable output voltages in lead-free (RoHS compliant) MLF(R) and Thin SOT-23-5 packages. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * * Ultra low dropout voltage - 40mV @ 150mA Input voltage range: 2.3V to 5.5V 150mA guaranteed output current Stable with ceramic output capacitors Ultra low output noise - 30Vrms Low quiescent current - 85A total High PSRR - up to 75dB@1kHz 35s turn-on time High output accuracy - 2% initial accuracy - 3% over temperature * Thermal shutdown and current limit protection * Tiny 6-pin 1.6mm x 1.6mm MLF(R) leadless package * Thin SOT-23-5 package
Applications
* * * * * Mobile phones PDAs GPS receivers Portable electronics Digital still and video cameras
Typical Application
MIC5301-x.xYML
VIN
VIN EN
VOUT
1F
BYP
GND
1F
0.01F
Portable Application
ULDO is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademarks of Amkor Technologies, Inc. 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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MIC5301
Ordering Information
Part number MIC5301-2.85YML MIC5301YML MIC5301-2.85YD5 MIC5301YD5
Notes: * Under bar / Over bar symbol may not be to scale. ** Other Voltages available. Contact Micrel for details.
Marking Code* 2JC CAA QC2J QCAA
Output Voltage** 2.85V ADJ. 2.85V ADJ.
Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package 6-Pin 1.6 x 1.6 MLF(R) 6-Pin 1.6 x 1.6 MLF(R) 5-Pin TSOT-23 5-Pin TSOT-23
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Pin Configuration
EN 1 GND 2 IN 3 6 5 4 BYP NC OUT EN 1 GND 2 IN 3 6 5 4 BYP ADJ OUT
6-Pin 1.6mm x 1.6mm MLF (ML) Fixed (Top View)
6-Pin 1.6mm x 1.6mm MLF (ML) Adjustable (Top View)
EN GND IN 1 3 2
EN GND IN 1 3 2
4 BYP
5 OUT
4 ADJ
5 OUT
TSOT-23-5 (D5) Fixed (Top View)
TSOT-23-5 (D5) Adjustable (Top View)
Pin Description
Pin No. MLF-6 Fixed
1 2 3 4 5 - 6 HS Pad
Pin No. MLF-6 Adj.
1 2 3 4 - 5 6 HS Pad
Pin No. TSOT-23-5 Fixed
3 2 1 5 - - 4 -
Pin No. TSOT-23-5 Adj.
3 2 1 5 - 4 - -
Pin Name
Pin Function
EN GND IN OUT NC ADJ BYP E PAD
Enable Input. Active High. High = on, low = off. Do not leave floating. Ground Supply Input. Output Voltage. No connection. Adjust Input. Connect to external resistor voltage divider network. Reference Bypass: Connect external 0.01F to GND for reduced Output Noise. May be left open. Exposed Heatsink Pad connected to ground internally.
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) .....................................0V to +6V Enable Input Voltage (VEN)...........................0V to +6V Power Dissipation, Internally Limited(3) Lead Temperature (soldering, 3sec) ..................260C Storage Temperature (TS) ................ -65C to +150C
Operating Ratings(2)
Supply Voltage (VIN).............................. +2.3V to +5.5V Enable Input Voltage (VEN).............................. 0V to VIN Junction Temperature (TJ) ................. -40C to +125C Junction Thermal Resistance MLF-6 (JA).............................................. 100C/W TSOT-23-5 (JA) ...................................... 235C/W
Electrical Characteristics(4)
VIN = VOUT + 1.0V; COUT = 1.0F; IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C, unless noted.
Parameter
Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage
(5)
Conditions
Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT + 1V to 5.5V; IOUT = 100A IOUT = 100A to 150mA IOUT = 100A IOUT = 100mA IOUT = 150mA
Min
-2.0
Typ
Max
+2.0
Units
% % %/V %/V % mV mV mV A A dB dB
-3.0
0.02 0.15 0.1 25 40 85 0.01 75 50 275 450 30
+3.0
0.3 0.6
2.0 75 100 120
2
Ground Pin Current Ground Pin Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise
IOUT = 0 to 150mA VEN 0.2V f = 1kHz; COUT = 1.0F; CBYP = 0.1F f = 20kHz; COUT = 1.0F; CBYP = 0.1F VOUT = 0V COUT = 1.0F; CBYP = 0.1F; 10Hz to 100kHz Logic Low Logic High
850
mA VRMS
Enable Input
Enable Input Voltage Enable Input Current
0.2 1
0.01 0.01 35 1 1
V V A A s
VIL 0.2V VIH 1.0V
Turn-on Time
Turn-on Time COUT = 1.0F; CBYP = 0.1F
100
Notes: 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. 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.
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Functional Diagram
VIN EN QuickStart
VOUT
VREF
Error LDO Amp
BYP Thermal Shutdown
Current Limit GND
MIC5301 Block Diagram - Fixed
VIN EN QuickStart
VOUT
VREF
Error LDO Amp
BYP ADJ Thermal Shutdown Current Limit GND
MIC5301 Block Diagram - Adjustable
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Typical Characteristics
-90 -80 -70 -60 -50 -40 -30 -20 -10 0
Power Supply Rejection Ratio
50mA
100A 150mA VIN = 3.85V VOUT = 2.85V COUT = 1F CBYP = 0.1F 1 10 100 FREQUENCY (kHz) 1,000
10 0.1
60 55 VIN = VOUT + 1V = 2.8V V 50 COUT = 1F OUT 45 40 35 30 25 20 15 10 5 0
Dropout Voltage vs. Temperature
150mA
50 45 40 35 30 25 20 15 10 5 0 0
Dropout Voltage vs. Output Current
100mA
50mA 25mA
VIN = VOUT + 1V VOUT = 2.85V COUT = 1F 25 50 75 100 125 150 OUTPUT CURRENT (mA)
TEMPERATURE (C)
2.88 2.87 2.86 2.85 2.84 2.83 2.82 0
Output Voltage vs. Output Current
3.0 2.5 2.0 1.5 1.0
Output Voltage vs. Supply Voltage
3.45 3.25
Output Voltage vs. Temperature
VOUT = 2.85V 100A 150mA
3.05 2.85 2.65 2.45 VIN = VOUT + 1V VOUT = 2.85V COUT = 1F IOUT = 100A TEMPERATURE (C)
VIN = VOUT + 1V VOUT = 2.85V COUT = 1F 25 50 75 100 125 150 OUTPUT CURRENT (mA)
0.5 0 0 1 2 3 4 5 SUPPLY VOLTAGE (V) 6
2.25
100 90 80 70 60 50 40 30 20 10 0 0
Ground Current vs. Output Current
90 88 86 84 82 80 78 76 74 72 70
Ground Current vs. Temperature
150mA 100A VIN = VOUT + 1V VOUT = 2.85V COUT = 1F TEMPERATURE (C)
100 90 80 70 60 50 40 30 20 10 0 3.0
Ground Current vs. Supply Voltage
150mA 100A
VIN = VOUT + 1V VOUT = 2.85V COUT = 1F 25 50 75 100 125 150 OUTPUT CURRENT (mA)
3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
5.5
510 500 490 480 470 460 450 440 430 420 410 3.0
Current Limit vs. Input Voltage
10
Output Noise Spectral Density
1
0.1 0.01 VIN = 4V VOUT = 2.85V COUT = 1F CBYP = 0.1F 0.001 0.01 0.1 1 10 100 1,000 10,000 FREQUENCY (kHz)
VEN = VIN COUT = 1F 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5
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Functional Characteristics
Enable Turn-On Load Transient
Enable (0.5V/div)
Output Voltage (20mV/div)
150mA VIN = VOUT + 1V VOUT = 2.85V
Output Voltage (1V/div)
VIN = VOUT + 1V VOUT = 2.85V COUT = 1F CBYP = 0.1F Time (10s/div)
Output Current (50mA/div)
COUT = 1F 10mA
Time (40s/div)
Line Transient
5V 4V Input Voltage (2V/div) VIN = VOUT + 1V VOUT = 2.85V COUT = 1F CBYP = 0.1F IOUT = 10mA
Output Voltage (50mV/div)
Time (40s/div)
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Applications Information
Enable/Shutdown The MIC5301 comes with an 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. Input Capacitor The MIC5301 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 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. Output Capacitor The MIC5301 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. Bypass Capacitor A capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.1F capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving November 2006 8 PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5301 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the Typical Characteristics section for performance with different bypass capacitors. No-Load Stability Unlike many other voltage regulators, the MIC5301 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. Adjustable Regulator Application Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC5301 can be adjusted from 1.25V to 5.5V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation:
R1 VOUT = VREF 1 + R2 VREF = 1.25V
MIC5301YML VIN 1F VIN VOUT R1 EN ADJ GND 1F R2 VOUT
Figure 1. Adjustable Voltage Output
Thermal Considerations The MIC5301 is designed to provide 150mA of continuous current. 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 5.0V, the output voltage is 2.8V and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation:
PD = (VIN - VOUT) IOUT + VIN IGND Because this device is CMOS and the ground current is typically <100A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (5V - 2.8V) x 150mA PD = 0.33W
M9999-111506
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:
PD(MAX) =
MIC5301
The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5301-2.8YML at an input voltage of 5V and 150mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.33W = (125C - TA)/(100C/W) TA=92C Therefore, a 2.8V application with 150mA of output current can accept an ambient operating temperature of 92C in a 1.6mm x 1.6mm 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

TJ(MAX) - TA
JA
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 100C/W. The table below shows junction-to-ambient thermal resistance for the MIC5301 in the 6-pin 1.6mm x 1.6mm MLF(R) package.
Package 6-Pin 1.6x1.6 MLF
(R)
JA Recommended Minimum Footprint 100C/W
Thermal Resistance
Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 100C/W.
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MIC5301
Package Information
6-Pin 1.6mm x 1.6mm MLF (ML)
5-Pin TSOT-23 (D5)
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MIC5301
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) 2006 Micrel, Inc.
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