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MIC5305
Micrel
MIC5305
150mA Cap Ultra-Low Dropout LDO Regulator
General Description
The MIC5305 is a high-performance, 150mA LDO regulator, offering extremely high PSRR and very low noise while consuming low ground current. Ideal for battery-operated applications, the MIC5305 features 1% accuracy, extremely low-dropout voltage (60mV @ 150mA), and low ground current at light load (typically 90A). Equipped with a logic-compatible enable pin, the MIC5305 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5305 is a Cap design operating with very small ceramic output capacitors for stability, thereby reducing required board space and component cost. The MIC5305 is available in fixed-output voltages and adjustable output voltages in the super-compact 2mm x 2mm MLFTM-6 leadless package and thin SOT-23-5 package. Additional voltage options are available. Contact Micrel marketing. All support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * * Ultra-low dropout voltage of 60mV @ 150mA Input voltage range: 2.25 to 5.5V Stable with ceramic output capacitor 150mA guaranteed output current Low output noise -- 20Vrms Low quiescent current of 90A total High PSRR, up to 85dB @1kHz Less than 30s turn-on time w/CBYP = 0.01F High output accuracy: * 1.0% initial accuracy * 2.0% over temperature Thermal shutdown protection Current limit protection Tiny 2mm x 2mm MLFTM-6 package Thin SOT-23-5 package Cellular phones PDAs Fiber optic modules Portable electronics Notebook PCs Audio Codec power supplies
* * * * * * * * * *
Applications
Typical Application
70
Dropout Voltage
DROPOUT VOLTAGE (mV)
60 50 40 30 20 10 0 0 20 40 60 80 100 120 140 OUTPUT CURRENT (mA)
MIC5305
3.0V VIN 1F
VIN VOUT EN BYP GND 0.1F 1F
2.85V@150mA VOUT
100 90 80 70
PSRR (Bypass Pin Cap = 0.1F)
150mA
PSRR (dB)
60 50 40 30 20 10 0 0.1 100A
50mA
1 10 100 FREQUENCY (kHz)
1k
MicroLeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 474-1000 * fax + 1 (408) 474-1000 * http://www.micrel.com
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Ordering Information
Part Number MIC5305-1.5BML MIC5305-1.5BD5 MIC5305-1.8BML MIC5305-1.8BD5 MIC5305-2.5BML MIC5305-2.5BD5 MIC5305-2.6BML MIC5305-2.7BML MIC5305-2.8BML MIC5305-2.85BML MIC5305-2.85BD5 MIC5305-2.9BML MIC5305-2.9BD5 MIC5305-3.0BML MIC5305-3.0BD5 MIC5305-3.3BML MIC5305-4.75BML MIC5305BML(2)
Note: 1. For other output voltage options, contact Micrel marketing. 2. Please contact Micrel marketing regarding availability.
Marking 815 N815 818 N818 825 N825 826 827 828 82J N82J 829 N829 830 N830 833 84H 8AA
Voltage 1.5 1.5 1.8 1.8 2.5 2.5 2.6 2.7 2.8 2.85 2.85 2.9 2.9 3.0 3.0 3.3 4.75 ADJ
Junction Temp. Range(1) -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package 6-pin 2x2 MLFTM Thin SOT23-5 6-pin 2x2 MLFTM Thin SOT23-5 6-pin 2x2 MLFTM Thin SOT23-5 6-pin 2x2 MLFTM 6-pin 2x2 MLFTM 6-pin 2x2 MLFTM 6-pin 2x2 MLFTM Thin SOT23-5 6-pin 2x2 MLFTM Thin SOT23-5 6-pin 2x2 MLFTM Thin SOT23-5 6-pin 2x2 MLFTM 6-pin 2x2 MLFTM 6-pin 2x2 MLFTM
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Pin Configuration
EN 1 GND 2 VIN 3 6 BYP 5 NC 4 VOUT EN 1 GND 2 VIN 3 6 BYP 5 ADJ 4 VOUT
MIC5305-x.xBML 6-Pin 2mm x 2mm MLFTM (ML) (Top View)
MIC5305BML (Adjustable) 6-Pin 2mm x 2mm MLFTM (ML) (Top View)
EN GND VIN
3 2 1
KWxx
4 5
BYP
VOUT
MIC5305-x.xBD5 TSOT-23-5 (D5) (Top View)
Pin Description
Pin Number Pin Number Pin Number Pin Name MLF-6 Fixed MLF-6 Adjust. TSOT-23-5 Fixed 1 2 3 4 5 6 HS Pad 1 2 3 4 5 6 HS Pad 3 2 1 5 4 EN GND VIN VOUT ADJ NC BYP EPAD Pin Function Enable Input. Active High. High = on, low = off. Do not leave floating. Ground. Supply Input. Output voltage. Adjust Input: Connect to external resistor voltage divider network. No connection for fixed voltage parts. 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 Input Voltage (VIN) .................................... 0V to 6V Enable Input Voltage (VEN) ................................... 0V to 6V Power Dissipation (PD) ........................ Internally Limited(3) Junction Temperature(TJ) ........................ -40C to +125C Storage Temperature (TS) ......................... -65C to 150C Lead Temperature (soldering, 5 sec.) ....................... 260C ESD(4) .............................................................................................. 2kV
Operating Ratings(2)
Supply Input Voltage (VIN) ............................ 2.25V to 5.5V Enable Input Voltage (VEN) .................................. 0V to VIN Junction Temperature (TJ) ....................... -40C to +125C Package Thermal Resistance (est.) MLF-6 (JA) ........................................................ 93 C/W TSOT-23 (JA) ................................................... 235C/W
Electrical Characteristics(5)
VIN = VOUT +1.0V; COUT = 1.0F, IOUT = 100A; TJ = 25C, bold values indicate -40C to + 125C; unless noted. Parameter Output Voltage Accuracy Condition Variation from nominal VOUT Variation from nominal VOUT, IOUT = 100A to 150mA Output Voltage Temp. Coefficient Line Regulation Load Regulation(6) Dropout Voltage(7) VIN = VOUT +1V to 5.5V IOUT = 100A to 150mA IOUT = 50mA IOUT = 150mA Ground Pin Current(8) IOUT = 0 to 150mA VEN 0.2V f = up to 1kHz; COUT = 1.0F ceramic; CBYP = 0.1F f = 10kHz; COUT = 1.0F ceramic; CBYP = 0.1F Current Limit Output Voltage Noise Turn-On Time Enable Input Enable Input Voltage Logic Low (Regulator Shutdown) Logic High (Regulator Enabled) Enable Input Current VIL 0.2V (Regulator Shutdown) VIH 1.0V (Regulator Enabled)
Notes: 1. Exceeding maximum ratings may damage the device. 2. The device is not guaranteed to work outside its operating ratings. 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. 5. Specification for packaged product only. 6. 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. 7. 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 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V. 8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current.
Min -1.0 -2.0
Typ
Max +1.0 +2.0
Units % % ppm/C
40 0.02 0.1 20 60 90 0.5 85 65 300 600 20 30 100 900 0.3 0.5 35 85 150
%/V % mV mV A A dB dB mA Vrms s
Ground Pin Current in Shutdown Ripple Rejection
VOUT = 0V COUT =1F, CBYP = 0.01F, 10Hz to 100kHz COUT = 1F; CBYP = 0.01F; IOUT= 150mA
0.2 1.0 0.01 0.01 1 1
V V A A
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Typical Characteristics
PSRR (Bypass Pin Cap = 0.01F)
50mA 100 150mA
PSRR (dB)
120
100 90 80 70 60 50 40 30 20
PSRR (Bypass Pin Cap = 0.1F)
150mA
100 90 80 70
PSRR (dB)
PSRR (Bypass Pin Cap = 1F)
150mA
PSRR (dB)
80 60 40 20 0 0.1
100A
50mA 100A
60 50 40 30 20 10 0 0.1 100A
50mA
1 10 100 FREQUENCY (kHz)
1k
10 0 0.1
1 10 100 FREQUENCY (kHz)
1k
1 10 100 FREQUENCY (kHz)
1k
Ground Pin Current
GROUND CURRENT (A)
90
85 80 75 VIN = VOUT +1V 70 0.1 1 10 100 1000 OUTPUT CURRENT (mA)
94 92 90 88 86 84 82 80 78 76 74 ILOAD = 100A 72 70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Ground Pin Current
94 92 90 88 86 84 82 80 78 76 74 ILOAD = 150mA 72 70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Ground Pin Current
GROUND CURRENT (A)
100
GROUND CURRENT (A)
Ground Pin Current
GROUND CURRENT (A)
70 60 50 40 30 20 10 0 0 ILOAD = 100A 1 2 3 4 5 INPUT VOLTAGE (V) 6
OUTPUT VOLTAGE (V)
90 80
100 90 80 70 60 50 40 30 20 10 0 0
Ground Pin Current
3.5 3 2.5 2 1.5 1 0.5 0 0
GROUND CURRENT (A)
Dropout Characteristics
ILOAD = 100A
ILOAD = 150mA
ILOAD = 150mA 1 2 3 4 5 INPUT VOLTAGE (V) 6
1 2 3 4 5 INPUT VOLTAGE (V)
6
2
Dropout Voltage
DROPOUT VOLTAGE (mV) 100 90 80 70 60 50 40 30 20 10
Dropout Voltage
DROPOUT VOLTAGE (mV)
100 90 80 70 60 50 40 30 20
Dropout Voltage
DROPOUT VOLTAGE (mV)
1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 IOUT = 1mA 0.2 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
IOUT = 50mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
10 IOUT = 100mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
90 80 70 60 50 40 30 20 10 IOUT = 150mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
SHORT CIRCUIT CURRENT (mA)
100
Dropout Voltage
70 60 50 40 30 20 10 0 0
Dropout Voltage
800 700 600 500 400 300 200 100 0 3
Short Circuit Current
20 40 60 80 100 120 140 OUTPUT CURRENT (mA)
3.5 4 4.5 5 5.5 INPUT VOLTAGE (V)
6
ENABLE THRESHOLD VOLTAGE (V)
2.92 2.91 2.9
Output Voltage vs. Temperature
1 0.9 0.8 0.7 0.6 0.5 0.4
Enable Threshold vs. Temperature
Spectral Noise Density (mA)
Output Noise Spectral Density
1
VOUT (V)
0.1
2.89 2.88 2.87 2.86 ILOAD = 100A VOUT = 2.9V
0.01 VIN = 5V
10 10000 1000 1000000 100 100000
2.85 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
ILOAD = 100A 0.3 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
0.001
FREQUENCY (Hz)
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Line Transient Response
5V Input Voltage (1V/div) Output Voltage (50mV/div)
Load Transient Response
3V
Output Voltage (1V/div)
TIME (400s/div) TIME (4s/div)
Output Current (100mA/div)
CBYP = 0.01F IOUT = 100A COUT = 1F Ceramic
CBYP = 0.01F VIN = 4V COUT = 1F Ceramic
Enable Pin Delay
Enable Voltage (1V/div) Enable Voltage (1V/div)
Shutdown Delay
Output Voltage (1V/div)
CBYP = 0.01F IOUT = 100A CIN = 1F Ceramic COUT = 1F Ceramic TIME (10s/div)
Output Voltage (1V/div)
CBYP = 0.01F IOUT = 100A VIN = 4V CIN = 1F Ceramic COUT = 1F Ceramic
TIME (20ms/div)
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Functional Diagram
VIN EN QuickStart
VOUT
VREF
Error LDO Amp
BYP Thermal Shutdown
Current Limit GND
MIC5305 Block Diagram
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No-Load Stability Unlike many other voltage regulators, the MIC5305 will remain stable and in regulation with no load. This is especially import 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 MIC5305 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:
Applications Information
Enable/Shutdown The MIC5305 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-modecurrent 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 MIC5305 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 high frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit. Output Capacitor The MIC5305 requires an output capacitor of 1F or greater to maintain stability. The design is optimized for use with lowESR 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. X7Rtype 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 PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5305 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.
R1 VOUT = VREF 1 + R2 VREF = 1.25V
MIC5305BML
VIN 1F
VIN VOUT R1 EN ADJ GND
VOUT 1F R2
Figure 1. Adjustable Voltage Application Thermal Considerations The MIC5305 is designed to provide 150mA 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 5.0V, the output voltage is 2.9V 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 = (5.0V - 2.9V) x 150mA PD = 0.32W To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: T (max) - TA PD (max) = J JA TJ(max) = 125C, the max. junction temperture of the die JA thermal resistance = 93C/W
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Table 1 shows junction-to-ambient thermal resistance for the MIC5305 in the 2mm x 2mm MLFTM-6 package.
Package 2 x 2 MLFTM-6 JA Recommended Minimum Footprint 93C/W JC 2C/W
Micrel
0.32W = 125C - TA 93C/W
Table 1. SOT-23-5 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 93C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5305-2.9BML at an input voltage of 5.0V and 150mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows:
TA = 95.2C
Therefore, a 2.9V application at 150mA of output current can accept an ambient operating temperature of 95.2C in a 2mm x 2mm MLFTM-6 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 LowDropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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Package Information
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN MILLIMETERS
SIDE VIEW
Rev. 02
6-Pin MLFTM (ML)
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MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated.
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