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MIC5303
Single 300mA CMOS Ultra Small ULDOTM
General Description
The MIC5303 is an ultra small, Ultra Low Dropout CMOS regulator, ULDOTM that is ideal for today's most demanding portable applications including cellular phone RF power, camera modules, imaging sensors for digital still and video cameras, PDAs, portable media players (PMP) and PC cameras where board space is limited. It offers extremely low dropout voltage, very low output noise and can operate from a 2.3V to 5.5V input while delivering up to 300mA. It offers 2% initial accuracy, low ground current (typically 85A total), thermal and current limit protection. The MIC5303 can also be put into a zero-off-mode current state, drawing no current when disabled. The MIC5303 is available in the ultra small 4-pin 1.2mm x 1.6mm Thin MLF(R) package, occupying only 1.92mm2 of PCB area, a 50% reduction in board area compared to SC-70 and 2mm x 2mm MLF(R) packages. It's operating junction temperature range is -40C to +125C and is available in fixed output voltages in lead-free (RoHS compliant) Thin MLF(R) package. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * * Ultra Small 1.2mm x 1.6mm Thin MLF(R) package Low Dropout Voltage: 100mV at 300mA Output noise 120Vrms Input voltage range: 2.3V to 5.5V 300mA guaranteed output current Stable with ceramic output capacitors Low quiescent current 85A total 35s turn-on time High output accuracy - 2% initial accuracy - 3% over temperature * Thermal shutdown and current limit protection
Applications
* * * * * * Mobile Phones PDAs GPS Receivers Portable Media Players Portable Electronics Digital Still & Video Cameras
Typical Application
MIC5303-x.xYMT
150
VIN EN VOUT
Dropout Voltage vs. Output Current
125 100
1F
GND
1F
75 50 25 VOUT = 2.8V COUT = 1F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
RF LDO Application
0 0
ULDO is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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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MIC5303
Block Diagram
VIN EN VREF QuickStart VOUT
Error LDO Amp
Thermal Shutdown
Current Limit GND MIC5303 Block Diagram
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MIC5303
Ordering Information(1)
Part Number MIC5303-1.5YMT MIC5303-1.8YMT MIC5303-2.1YMT MIC5303-2.8YMT MIC5303-2.85YMT MIC5303-2.9YMT MIC5303-3.0YMT MIC5303-3.3YMT
Note: 1. Other voltages available. Contact Micrel Marketing for details.
Marking Code 1M5 1M8 2M1 2M8 2MN 2M9 3M0 3M3
Voltage 1.5V 1.8V 2.1V 2.8V 2.85V 2.9V 3.0V 3.3V
Temperature Range -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 4-Pin 1.2mm x 1.6mm Thin MLF 4-Pin 1.2mm x 1.6mm Thin MLF 4-Pin 1.2mm x 1.6mm Thin MLF 4-Pin 1.2mm x 1.6mm Thin MLF 4-Pin 1.2mm x 1.6mm Thin MLF 4-Pin 1.2mm x 1.6mm Thin MLF
(R) (R)
Lead Finish Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free
4-Pin 1.2mm x 1.6mm Thin MLF(R)
(R) (R)
4-Pin 1.2mm x 1.6mm Thin MLF(R)
(R) (R)
Pin Configuration
EN
1
4
VOUT
GND
2
3
VIN
4-Pin 1.2mm x 1.6mm Thin MLF(R) (MT)
Pin Description
Pin Number 1 2 3 4 Pin Name EN GND VIN VOUT Pin Function Enable Input. Active High. High = on, low = off. Do not leave floating. Ground Supply Input Output Voltage
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) ............................................. 0V to +6V Enable Input (VEN) ................................................ 0V to +6V Power Dissipation(3)...................................Internally Limited Lead Temperature (soldering, 5 sec.)........................ 260C Junction Temperature (TJ) ........................-40C to +125C Storage Temperature (Ts) .........................-65C to +150C
Operating Ratings(2)
Supply voltage (VIN) ..................................... +2.3V to +5.5V Enable Input (VEN) .................................................. 0V to VIN Junction Temperature (TA) ........................ -40C to +125C Junction Thermal Resistance Thin MLF(R) -4 (JA) ...........................................173C/W
Electrical Characteristics(4)
VIN = VOUT + 1V; COUT = 1.0F; IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C, unless noted.
Parameter Output Voltage Accuracy Line Regulation Load Regulation(5) Dropout Voltage(6) Condition 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 = 50mA IOUT = 150mA IOUT = 300mA IOUT = 0 to 300mA, EN = High VEN = 0V f = up to 1kHz; COUT = 1.0F f = 1kHz - 20kHz; COUT = 1.0F VOUT = 0V COUT =1F, 10Hz to 100kHz Logic Low Logic High VIL < 0.2V VIH > 1.0V COUT = 1.0F Min -2 -3 0.02 0.5 0.1 15 50 100 85 0.1 65 42 350 460 120 850 Typ Max +2 +3 0.3 0.6 2.0 35 100 200 120 2 Units % % %/V % mV mV mV mV A A dB dB mA VRMS V V A A s
Ground Pin Current(7) Ground Pin Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise Enable Input Enable Input Voltage Enable Input Current Turn-on Time
Notes:
0.2 1.1 0.01 0.01 35
100
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. 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. 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. 7. 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.
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Typical Characteristics
100 90 80 70 60 50 40 30 20 10 0 0 VIN = VOUT + 1V VOUT = 2.8V COUT = 1F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
Ground Pin Current vs. Output Current
90 88 86 84 82 80 78 76 74 72 70
Ground Pin Current vs. Temperature
300mA
100 90 80 70
Ground Pin Current vs. Supply Voltage
300mA 100A
100A
60 50 40 30 20 10 0 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F 20 40 60 80 TEMPERATURE (C)
-80 -70 -60
Power Supply Rejection Ratio
50mA
160
Dropout Voltage vs. Temperature
300mA
VOUT = 2.8V 140 COUT = 1F 120 100 80 60 40 20 1,000 0
150 125 100
Dropout Voltage vs. Output Current
150mA -50 300mA -40 -30 -20 VIN = VOUT + 1V -10 VOUT = 2.8V COUT = 1F 0 0.1 1 10 100 FREQUENCY (kHz)
150mA
75 50
50mA 100A 20 40 60 80 TEMPERATURE (C)
25 0 0
VOUT = 2.8V COUT = 1F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
2.83 2.82 2.81 2.80 2.79 2.78 2.77 0
Output Voltage vs. Output Current
3.2 2.8 2.4 2.0 1.6 1.2
Output Voltage vs. Supply Voltage
3.00 2.95 2.90 2.85 2.80 2.75
Output Voltage vs. Temperature
100A 300mA
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
0.8 0.4 0 0 COUT = 1F 1 2 3 4 5 SUPPLY VOLTAGE (V) 6
2.70 2.65 2.60 2.55 2.50
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F IOUT = 100A 20 40 60 80 TEMPERATURE (C)
500 490 480 470 460 450 440 430 420 410 400 3.0
Current Limit vs. Input Voltage
10
Output Noise Spectral Density
1
0.1
VOUT = 2.8V COUT = 1F 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5
0.01 VIN = VOUT + 1V VOUT = 2.8V COUT = 1F 0.001 0.01 0.1 1 10 100 1,000 FREQUENCY (kHz)
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Functional Characteristics
Enable Turn-On Load Transient Response
Enable (1V/div)
Output Voltage (50mV/div)
300mA VIN = VOUT + 1V VOUT = 2.8V COUT = 1F
Output Voltage (1V/div)
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F Time (10s/div)
Output Current (100mA/div)
Time (40s/div)
Line Transient Response
5V 4V Input Voltage (2V/div)
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F IOUT = 10mA
Output Voltage (50mV/div)
Time (40s/div)
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MIC5303 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 = (3.6V - 2.8V) x 300mA PD = 0.24W 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:
PD(MAX) =
Application Information
Enable/Shutdown The MIC5303 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 MIC5303 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 MIC5303 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. No-Load Stability Unlike many other voltage regulators, the MIC5303 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC5303 is designed to provide 300mA 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 3.6V, the output voltage is 2.8V and the output current = 300mA. October 2006

TJ(MAX) - TA
JA
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 173C/W. The table below shows junction-to-ambient thermal resistance for the MIC5303 in the 4-pin 1.2mm x 1.6mm MLF(R) package.
Package 4-Pin 1.2x1.6 MLF(R) JA Recommended Minimum Footprint 173C/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-toambient thermal resistance for the minimum footprint is 173C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5303-2.8YML at an input voltage of 3.6V and 300mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.24W = (125C - TA)/(173C/W) TA=83C Therefore, a 2.8V application with 300mA of output current can accept an ambient operating temperature of 83C in a 1.2mm 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
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Package Information
4-Pin 1.2mm x 1.6mm Thin MLF(R) (MT)
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, Incorporated.
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