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MIC5318
High Performance 300mA Cap ULDOTM
General Description
The MIC5318 is a high performance, single output ultra low drop-out (ULDOTM) regulator, offering low total output noise in an ultra-small Thin MLF(R) package. The MIC5318 is capable of sourcing 300mA output current and offers high PSRR and low output noise, making it an ideal solution for RF applications. Ideal for battery operated applications, the MIC5318 offers 2% initial accuracy, extremely low dropout voltage (110mV @ 300mA), and low ground current (typically 85A total). The MIC5318 can also be put into a zero-off-mode current state, drawing no current when disabled. The MIC5318 is available in the 1.6mm x 1.6mm Thin MLF(R) package, occupying only 2.56mm2 of PCB area, fully a 36% reduction in board area when compared to SC-70 and 2mm x 2mm MLF(R) packages. The MIC5318 has an operating junction temperature range of -40C to +125C and is available in fixed and adjustable output voltages in lead-free (RoHS compliant) Thin MLF(R) and Thin SOT23-5 packages. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* * * * * * * * * Ultra low dropout voltage 110mV @ 300mA Input voltage range: 2.3V to 6.0V 300mA guaranteed output current Stable with ceramic output capacitors Ultra low output noise - 30Vrms Low quiescent current - 85A total High PSRR > 70dB@1kHz Less than 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 Thin MLF(R) package Thin SOT23-5 package
* * *
Applications
* * * * * Mobile phones PDAs GPS receivers Portable electronics Digital still and video cameras
Typical Application
MIC5318-x.xYMT
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 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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MIC5318
Functional Diagram
VIN EN VREF QuickStart VOUT
Error LDO Amp
BYP Thermal Shutdown
Current Limit GND
MIC5318 Block Diagram - Fixed
VIN EN VREF QuickStart
VOUT
Error LDO Amp
BYP ADJ Thermal Shutdown Current Limit GND
MIC5318 Block Diagram - Adjustable
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MIC5318
Ordering Information
Part Number Marking Code Output Voltage Temperature Range Package
MIC5318-1.5YMT MIC5318-1.8YMT MIC5318-2.5YMT MIC5318-2.8YMT MIC5318-3.3YMT MIC5318YMT MIC5318-1.5YD5 MIC5318-1.8YD5 MIC5318-2.5YD5 MIC5318-2.8YD5 MIC5318-3.3YD5 MIC5318YD5
Note:
1.
15D 18D 25D 28D 33D DAA QD15 QD18 QD25 QD28 QD33 QDAA
1.5V 1.8V 2.5V 2.8V 3.3V ADJ 1.5V 1.8V 2.5V 2.8V 3.3V ADJ
-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
6-Pin 1.6 x 1.6 Thin MLF(R) 6-Pin 1.6 x 1.6 Thin MLF(R) 6-Pin 1.6 x 1.6 Thin MLF(R) 6-Pin 1.6 x 1.6 Thin MLF(R) 6-Pin 1.6 x 1.6 Thin MLF(R) 6-Pin 1.6 x 1.6 Thin MLF(R) 5-Pin Thin SOT23 5-Pin Thin SOT23 5-Pin Thin SOT23 5-Pin Thin SOT23 5-Pin Thin SOT23 5-Pin Thin SOT23
For availability on other voltages, please contact Micrel for details.
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MIC5318
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 Thin MLF (MT) Fixed (Top View)
(R)
6-Pin 1.6mm x 1.6mm Thin MLF (MT) Adjustable (Top View)
(R)
EN GND IN 1 3 2
EN GND IN 1 3 2
4 BYP
5 OUT
4 ADJ
5 OUT
5-Pin Thin SOT23 (D5) Fixed (Top View)
5-Pin Thin SOT23 (D5) Adjustable (Top View)
Pin Description
Pin No. Thin MLF-6 Fixed Pin No. Thin MLF-6 Adj. Pin No. Thin SOT23-5 Fixed Pin No. Thin SOT23-5 Adj. Pin Name Pin Function
1 2 3 4 5 - 6 HS Pad
1 2 3 4 - 5 6 HS Pad
3 2 1 5 - - 4 -
3 2 1 5 - 4 - -
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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MIC5318
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ..................................0V to +6.5V Enable Input Voltage (VEN)........................0V to +6.5V Power Dissipation, Internally Limited(3) Lead Temperature (soldering, 3sec) ..................260C Junction Temperature (TJ)................ -40C to +125C Storage Temperature (TS) ................ -65C to +150C ESD Rating(4)
Operating Ratings(2)
Supply Voltage (VIN).............................. +2.3V to +6.0V Enable Input Voltage (VEN).............................. 0V to VIN Junction Temperature (TJ) ................. -40C to +125C Junction Thermal Resistance Thin MLF-6 (JA)...................................... 100C/W TSOT-23-5 (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 Conditions Min -2.0 -3.0 Typ Max Units
Output Voltage Accuracy Line Regulation Load Regulation, Note 6 Dropout Voltage, Note 7 Ground Pin Current, Note 8 Ground Pin Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise
Enable Input
Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT + 1V to 6.0V; IOUT = 100A IOUT = 100A to 300mA IOUT = 50mA; VOUT 2.8V IOUT = 150mA; VOUT 2.8V IOUT = 300mA; VOUT 2.8V IOUT = 0 to 300mA VEN 0.2V f = up to 1kHz; COUT = 1.0F; CBYP = 0.1F f = 1kHz - 20kHz; COUT = 1.0F; CBYP = 0.1F VOUT = 0V COUT = 1.0F; CBYP = 0.1F; 10Hz to 100kHz Logic Low Logic High VIL 0.2V VIH 1.0V COUT = 1.0F; CBYP = 0.1F; IOUT = 150mA
+2.0
+3.0
% % %/V % mV A A dB
0.02 0.2 17 50 110 85 0.01 75 55
340
0.6 2.0 100 200 150
1
500 30
900
mA VRMS
Enable Input Voltage Enable Input Current
Turn-On Time
0.2 1.1
V A
0.01 0.01 30
1 1
100
Turn-On Time
Notes:
s
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. 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 2.3V, dropout voltage is the input-to-output differential with the minimum input voltage 2.3V. 8. Ground pin current is the regulation 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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MIC5318
Typical Characteristics
-100 -90 -80 -70 -60 300mA 150mA -50 -40 -30 VIN = VOUT + 1V -20 VOUT = 2.8V 50mA C = 1F -10 COUT = 0.1F BYP 0 0.1 1 10 100 1,000 FREQUENCY (kHz)
Power Supply Rejection Ratio
2.1 2.0 1.9 1.8 1.7 1.6 1.5
Output Voltage vs. Temperature
3.0 2.5 2.0 1.5
Output Voltage vs. Supply Voltage
100A
VIN = VOUT + 1V VOUT = 1.8V COUT = 1F IOUT = 100A TEMPERATURE (C)
1.0 0.5 0 0
300mA VOUT = 2.8V COUT = 1F 1234567 SUPPLY VOLTAGE (V)
2.90
Output Voltage vs. Output Current
2.85
2.80
2.75
2.70 05
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F 0 100 150 200 250 300 OUTPUT CURRENT (mA)
140 130 COUT = 1F 120 110 100 90 80 70 60 50 40 30 20 10 0
Dropout Voltage vs. Temperature
300mA
150mA
50mA
120 110 100 90 80 70 60 50 40 30 20 10 0 05
Dropout Voltage vs. Output Current
VOUT = 2.8V COUT = 1F 0 100 150 200 250 300 OUTPUT CURRENT (mA)
TEMPERATURE (C)
100 90 300mA 80 70 60 50 40 30 20 10 0
Ground Pin Current vs. Temperature
100A
VIN = VOUT + 1V VOUT = 1.8V COUT = 1F TEMPERATURE (C)
110 100 90 80 70 60 50 40 30 20 10 0 05
Ground Pin Current vs. Output Current
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F 0 100 150 200 250 300 OUTPUT CURRENT (mA)
110 100 90 80 300mA 100A 70 60 50 40 30 20 10 0 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 INPUT VOLTAGE (V)
Ground Pin Current vs. Input Voltage
600 580 560 540 520 500 480
Current Limit vs. Input Voltage
10
Output Noise Spectral Density
1
0.1 0.01 VIN = 4V VOUT = 2.8V COUT = 1F CBYP = 0.1F 0.001 0.01 0.1 1 10 100 1,000 10,000 FREQUENCY (kHz)
460 440 420 400 2 2.5 3 3.5 4 4.5 5 5.5 6 INPUT VOLTAGE (V)
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MIC5318
Functional Characteristics
Enable Turn-On
6V
Line Transient
Input Voltag e (2V/div)
Enable (0.5V/div)
3V
VOUT = 1.8V COUT = 1F
Output Voltag e (1V/div)
Output Voltag e (50mV/div)
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F CBYP = 0.1F Time (10s/div )
CBYP = 0.1F IOUT = 10mA
Time (40s/div )
Load Transient
Output Voltag e (50mVV/div)
300mA VIN = VOUT + 1V VOUT = 2.8V Output Current (100mA/div) COUT = 1F 10mA
Time (40s/div )
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MIC5318 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 MIC5318 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the Typical Characteristics subsection for performance with different bypass capacitors. No-Load Stability Unlike many other voltage regulators, the MIC5318 will remain stable and in regulation with no load. This is especially crucial for 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 MIC5318 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
Application Information
Enable/Shutdown The MIC5318 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 MIC5318 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 MIC5318 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.
VREF = 1.25V
MIC5318YMT VIN 1F VIN VOUT R1 EN ADJ GND 1F R2 VOUT
Figure 1. Adjustable Voltage Output
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Micrel, Inc. Thermal Considerations The MIC5318 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 3.3V, the output voltage is 2.8V and the output current = 300mA. 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 = (3.3V - 2.8V) x 300mA PD = 0.15W To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation:
MIC5318 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. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5318-2.8YMT at an input voltage of 3.3V and 300mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.15W = (125C - TA)/(100C/W) TA = 110C Therefore, a 2.8V application with 300mA of output current can accept an ambient operating temperature of 110C in a 1.6mm x 1.6mm Thin 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 LowDropout 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 = 100C/W. The table below shows junction-to-ambient thermal resistance for the MIC5318 in the 6-pin 1.6mm x 1.6mm Thin MLF(R) package.
Package
JA Recommended Minimum Footprint
6-Pin 1.6x1.6 Thin MLF(R)
100C/W
Thermal Resistance
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MIC5318
Package Information
6-Pin 1.6mm x 1.6mm Thin MLF (MT)
(R)
5-Pin TSOT-23 (D5)
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MIC5318
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
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel's terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right 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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