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MIC5353
500mA LDO in 1.6mm x 1.6mm Package
General Description
The MIC5353 is a high-performance, single-output, ultralow LDO (ULDOTM) regulator, offering a low total output noise of 30VRMS. The MIC5353 is capable of sourcing 500mA output current and offers high-PSRR and lowoutput noise, making it an ideal solution for RF applications. The MIC5353 provides 2% accuracy, extremely low dropout voltage (160mV @ 500mA), and low ground current (typically 90A) making it ideal for battery-operated applications. When disabled, the MIC5353 enters a zerooff-mode current state, thereby drawing almost no current. The MIC5353 is available in the 1.6mm x 1.6mm Thin MLF(R) package, occupying only 2.56mm2 of PCB area, a 36% reduction in board area compared to SC-70 and 2mm x 2mm Thin MLF(R) packages. The MIC5353 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) package. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* * * * * * * * * * 500mA guaranteed output current Input voltage range: 2.6V to 6V Ultra low dropout voltage: 160mV @ 500mA 2% initial accuracy Ultra low output noise: 30Vrms Low quiescent current: 90A Stable with ceramic output capacitors 35s turn-on time Thermal shutdown and current limit protection Tiny 6-pin 1.6mm x 1.6mm Thin MLF(R) leadless package
Applications
* * * * * Mobile Phones GPS, PDAs, PMP, handhelds Portable electronics Digital still and video cameras Digital TV
_________________________________________________________________________________________________________________________
Typical Application
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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Micrel, Inc.
MIC5353
Ordering Information
Part Number MIC5353-1.8YMT MIC5353-2.5YMT MIC5353-2.6YMT MIC5353-2.8YMT MIC5353-3.0YMT MIC5353-3.3YMT MIC5353YMT
Notes: 1. 2. 3. Pin 1 identifier= "". For other voltage options contact Micrel Marketing. Thin MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu, Mold compound is Halogen Free.
(R)
Marking Code(1) 18R 25R 26R 28R 30R 33R AAR
Output Voltage(2) 1.8V 2.5V 2.6V 2.8V 3.0V 3.3V ADJ
Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R)
Pin Configuration
6-Pin 1.6mm x 1.6mm Thin MLF(R) (MT) Fixed (TOP VIEW)
6-Pin 1.6mm x 1.6mm Thin MLF(R)(MT) Adjustable (TOP VIEW)
Pin Description
Pin Number Thin MLF-6 Fixed 1 2 3 4 5 - 6 EPad Pin Number Thin MLF-6 Adjustable 1 2 3 4 - 5 6 EPad Pin Name EN GND VIN VOUT NC ADJ BYP HS PAD Pin Function 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 0.1F to GND for reduced Output Noise. May be left open. Exposed Heat-sink Pad connected to ground internally.
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) ..................................... -0.3V to +6.5V Enable Input Voltage (VEN)................................-0.3V to VIN Power Dissipation ..................................Internally Limited(3) Lead Temperature (soldering, 3sec) .......................... 260C Storage Temperature (TS).........................-65C to +150C ESD Rating(4) ................................................................. 2KV
Operating Ratings(2)
Supply Voltage (VIN) ...................................... +2.6V to +6.0V Enable Input Voltage (VEN) ...................................... 0V to VIN Junction Temperature (TJ) .......................... -40C to +125C Junction Thermal Resistance 6-Pin 1.6mm x1.6mm Thin MLF(R) (JA) ...........92.4C/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 Line Regulation Load Regulation Dropout Voltage (6) Ground Pin Current Ground Pin Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise Enable Input Enable Input Voltage Enable Input Current Turn-on Time 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. 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 1.5K in series with 100pF. 5. Specification for packaged product only. 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.
Conditions Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT + 1V to 6V; IOUT = 100A IOUT = 100A to 500mA IOUT = 150mA IOUT = 300mA IOUT = 500mA IOUT = 0 to 500mA 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 VIL 0.2V VIH 1.2V COUT = 1.0F; CBYP = 0.1F
Min. -2.0 -3.0
Typ.
Max. +2.0 +3.0
Units % %/V % mV A A dB
0.05 0.15 50 100 160 90 0.01 60 45 600 1100 30
0.3 0.6 2.0 100 200 350 175 2
1600
mA VRMS
0.2 1.2 0.01 0.01 35 1 1 100
V A
s
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Functional Diagram
MIC5353 Block Diagram - FIXED
MIC5353 Block Diagram - ADJUSTABLE
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Typical Characteristics
Dropout Voltage vs. Output Current
200
250
Dropout Voltage vs. Temperature
92 90
Ground Current vs. Output Current
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
180 160 140 120 100 80 60 40 20 0 0 50 100 150 200 250 300 350 400 450 500
500mA
Ground Current(A)
200
88 86 84 82
150
100
300mA
VOUT = 2.8V VIN = 3.8V
50
150mA
0 -40 -20 0 20 40 60 80 100 120 140
80 0 100 200 300 400 500
OUTPUT CURRENT (mA)
TEMPERATURE (C)
Output Current(mA)
Ground Current vs. Temperature
120
1.84 1.83
Output Voltage vs. Output Current
3.6
Output Voltage vs. Input Voltage
3.4 3.2 3 2.8 2.6 2.4 2.2 2 150mA 2.6 3 3.4 3.8 4.2 500mA 300mA VOUT = 2.8V CIN = COUT = 1F 4.6 5 5.4 5.8 100A
GROUND CURRENT (A)
OUTPUT VOLTAGE(V)
110 100 IOUT = 500mA 90 80 70 60 -40 -20 0 20 40 60 80 100 120 140
1.82 1.81 1.8 1.79 1.78 1.77 1.76 0 50 100 150 200 250 300 350 400 450 500
IOUT = 100A
VIN =2.8V COUT=CIN =1F
OUTPUT CURRENT(mA)
OUTPUT VOLTAGE (V)
TEMPERATURE (C)
INPUT VOLTAGE (V)
1.4
Current Limit vs. Input Voltage
-100
Output Noise Spectral Density
PSRR
10
1.3
CURRENT LIMIT(mA)
-90
1.2
-80 -70 -60
500A
1
dB
1
VOUT =2.8V CIN=COUT =1F
Noise uV/Hz
1.1
100A
-50 300A -40 -30
0.1
0.9
0.8 2.5 3 3.5 4 4.5 5 5.5 6
-20 -10 0 10 100 1,000 10,000 100,000 1,000,000 10,000,000 COUT = 1F CBYP = 0.1F
0.01
INPUT VOLTAGE(V)
VIN = 4.5V COUT = 1F VOUT = 1.8V ILOAD = 50mA CBYP = 0.1F 10 100 1,000 10,000 100,000 1,000,000 10,000,000
0.001
FREQUENCY (Hz)
FREQUENCY (Hz)
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Functional Characteristics
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MIC5353 A unique, quick-start circuit allows the MIC5353 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. No-Load Stability Unlike many other voltage regulators, the MIC5353 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 MIC5353 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 MIC5353 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 MIC5353 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. The use of additional high-frequency capacitors, such as smallvalued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RFbased circuit. Output Capacitor The MIC5353 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, although performance has been optimized for a 1F ceramic output capacitor and doing so does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. The 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 thereby ensuring the same minimum capacitance over the equivalent operating temperature range. Bypass Capacitor A capacitor can be placed from the noise bypass pin-toground 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.
R1 VOUT = VREF 1 + R2 VREF = 1.25V
Figure 1. Adjustable Voltage Output
Thermal Considerations The MIC5353 is designed to provide 500mA 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 = 500mA. The actual power dissipation of the regulator circuit can be determined using the equation:
PD = (VIN - VOUT) IOUT + VIN IGND
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Micrel, Inc. 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 500mA PD = 0.25W 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:
MIC5353 The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5353-2.8YMT at an input voltage of 3.3V and 500mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.25W = (125C - TA)/(92.4C/W) TA=101C Therefore, a 2.8V application with 500mA of output current can accept an ambient operating temperature of 101C 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 Low-Dropout 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 = 92.4C/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 92.4C/W.
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Typical Application Schematic (Fixed Output)
Bill of Materials
Item C1,C3 C2 U1
Notes:
Part Number 06036D105KAT2A GRM188R60J105KE19D 06035C104KAT2A GRM188R71H104KA93D MIC5353-XXYMT
Manufacturer AVX
(1) (2)
Description Capacitor, 1F Ceramic, 6.3V, X5R, Size 0603 Capacitor, 0.1F Ceramic, 50V, X5R, Size 0603 500mA LDO, 1.6mm x 1.6mm Thin MLF(R)
Qty. 2 1 1
muRata
AVX(1) muRata
(2)
Micrel, Inc.(3)
1. AVX: www.avx.com. 2. Murata Tel: www.murata.com.
3. Micrel, Inc.: www.micrel.com.
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MIC5353
Typical Application Schematic (Adjustable Output)
Bill of Materials
Item C1,C3 C2 R1 R2 U1
Notes:
Part Number 06036D105KAT2A GRM188R60J105KE19D 06035C104KAT2A GRM188R71H104KA93D CRCW060320K0FKEA CRCW060310K0FKEA MIC5353YMT
Manufacturer AVX
(1) (2)
Description Capacitor, 1F Ceramic, 6.3V, X5R, Size 0603 Capacitor, 0.1F Ceramic, 50V, X5R, Size 0603 Resistor, 20k, 1%, 1/16W, Size 0603 Resistor, 10k, 1%, 1/16W, Size 0603
Qty. 2 1 1 1
(R)
muRata
AVX(1) muRata
(2)
Vishay(3) Vishay(3) Micrel, Inc.
(4)
Adjustable 500mA LDO, 1.6mm x 1.6mm Thin MLF
1
1. AVX: www.avx.com. 2. Murata Tel: www.murata.com. 3. Vishay Tel: www.vishay.com.
4. Micrel, Inc.: www.micrel.com.
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PCB Layout Recommendations
TOP LAYER
BOTTOM LAYER
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Package Information
6-Pin 1.6mm 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) 2010 Micrel, Incorporated.
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