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MIC5350
Dual 300mA/500mA LDO in 2mm x 2mm Thin MLF(R)
General Description
The MIC5350 is a tiny Dual Ultra Low-Dropout (ULDOTM) linear regulator ideally suited for portable electronics due to its low output noise. The MIC5350 integrates two highperformance; 300mA (VOUT1) and 500mA (VOUT2) ULDOsTM into a tiny 2mm x 2mm leadless Thin MLF(R) package, which provides exceptional thermal characteristics. The MIC5350 is designed to be stable with small ceramic output capacitors thereby reducing required board space and component cost. The combination of extremely lowdrop-out voltage, low output noise and exceptional thermal package characteristics makes it ideal for powering RF and noise-sensitive circuitry, cellular phone camera modules, imaging sensors for digital still cameras, PDAs, MP3 players and WebCam applications. The MIC5350 ULDOTM is available in fixed-output voltages in the tiny 8-pin 2mm x 2mm leadless Thin MLF(R) package which occupies less than half the board area of a single SOT23-6 package. Additional voltage options are available. For more information, contact Micrel marketing. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* 2.6V to 5.5V input voltage range * Ultra-low dropout voltage: 75mV @ 300mA and 125mV @ 500mA * Ultra-low output noise: 30VRMS * 2% initial output accuracy * Tiny 8-pin 2mm x 2mm Thin MLF(R) leadless package * Excellent Load/Line transient response * Fast start-up time: 30s * Cap stable with 2.2F ceramic capacitors * Thermal shutdown protection * Low quiescent current: 130A with both outputs at maximum load * Current-limit protection
Applications
* * * * * * Mobile phones PDAs GPS receivers Portable electronics Portable media players Digital still and video cameras
_________________________________________________________________________________________________________________________
Typical Application
RF Power Supply Circuit
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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Block Diagram
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Ordering Information
Part Number MIC5350-2.8/1.8YMT MIC5350-2.8/2.8YMT MIC5350-3.0/1.8YMT MIC5350-3.3/1.8YMT MIC5350-3.3/2.8YMT
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)
Manufacturing Part Number MIC5350-MGYMT MIC5350-MMYMT MIC5350-PGYMT MIC5350-SGYMT MIC5350-SMYMT
Marking FMG FMM FPG FSG FSM
Voltage(V) VOUT1 2.8V 2.8V 3.0V 3.3V 3.3V VOUT2 1.8V 2.8V 1.8V 1.8V 2.8V
Junction Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package 8-Pin 2x2 TMLF(R) 8-Pin 2x2 TMLF(R) 8-Pin 2x2 TMLF(R) 8-Pin 2x2 TMLF(R) 8-Pin 2x2 TMLF(R)
Pin Configuration
8-Pin 2mm x 2mm TMLF (MT) TOP VIEW
Pin Description
Pin Number 1 2 3 4 5 6 7 8 EPAD Pin Name VIN GND BYP EN2 EN1 NC VOUT2 VOUT1 HS Pad Pin Function Supply Input. Ground. Reference Bypass: Connect external 0.1F to GND to reduce output noise. May be left open when bypass capacitor is not required. Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. Not internally connected. Regulator Output - LDO2 (500mA output). Regulator Output - LDO1 (300mA output). Heatsink Pad internally connected to ground.
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) ........................................ -0.3V to +6V Enable Input Voltage (VEN1 , VEN2).....................-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 +5.5V Enable Input Voltage (VEN1, VEN2) .......................... 0V to VIN Junction Temperature ............................... -40C to +125C Junction Thermal Resistance 8-Pin 2mm x 2mm Thin MLF(R) (JA) ...................90C/W
Electrical Characteristics(5)
VIN = VEN1 = VEN2 = VOUT + 1.0V; higher of the two regulator outputs, IOUTLDO1 = IOUTLDO2 = 100A; COUT1 = COUT2 = 2.2F; CBYP = 0.1F; TJ = 25C, bold values indicate -40C TJ +125C, unless noted. Parameter Output Voltage Accuracy Line Regulation Load Regulation Conditions Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT + 1V to 5.5V; IOUT = 100A IOUT1, 2 = 100A to 300mA IOUT2 =100A to 500mA IOUT1, 2 = 100A Dropout Voltage(6) IOUT1, 2 = 50mA IOUT1, 2 = 300mA IOUT2 = 500mA VEN1 1.2V; VEN2 0.2V; IOUT = 0mA to 300mA Ground Current Ground Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise Enable Inputs (EN1 / EN2) Enable Input Voltage Enable Input Current Logic Low Logic High VIL 0.2V VIH 1.2V COUT = 2.2F; CBYP = 0.01F 1.2 0.01 0.01 30 100 0.2 V A VEN1 0.2V; VEN2 1.2V; IOUT2 = 0mA to 500mA VEN1 = VEN2 = 1.2V; IOUT1 = 300mA, IOUT2 = 500mA VEN1 = VEN2 = 0V f = 1kHz; COUT = 2.2F; CBYP = 0.1F f = 20kHz; COUT = 2.2F; CBYP = 0.1F VOUT1 = 0V VOUT2 = 0V COUT = 2.2F; CBYP = 0.1F; 10Hz to 100kHz 350 550 Min. -2.0 -3.0 0.05 0.5 0.7 0.1 12 75 125 95 95 130 0.01 50 35 560 950 30 850 1500 50 200 300 175 175 240 2 A dB mA VRMS A mV Typ. Max. +2.0 +3.0 0.3 0.6 2.0 2.5 Units % %/V %
Turn-on Time (See Timing Diagram) Turn-on Time (LDO1 and 2)
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 VOUT. For outputs below 2.6V, the dropout voltage is the input-to-output differential with the minimum input voltage 2.6V.
s
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Typical Characteristics
Ground Current vs. Output Current
140 135
100
Ground Current vs. Temperature
3.6
Output Voltage vs. Input Voltage
3.4 100A
GROUND CURRENT (A)
GROUND CURRENT (A)
95
130 125 120 115 110 105 100 95 90 -40 -20 0 20 40 60 IOUT2 = 500mA 80 100 120 140 IOUT1 = 300mA
OUTPUT VOLTAGE (V)
IOUT1 = 300mA and IOUT2 = 500mA
3.2 3 2.8 2.6 2.4 2.2 2 1.8 1.6 1.4 2.5
300mA
90
85 VOUT2 = 2.8V VIN = 4.3V 80 0 100 200 300 400 500
VOUT1 = 3.3V CIN = COUT = 2.2F 3 3.5 4 4.5 5 5.5
OUTPUT CURRENT (mA)
TEMPERATURE (C)
INPUT VOLTAGE (V)
3 2.8
Output Voltage vs. Input Voltage
100A
1000 900
Current Limit vs. Input Voltage
180
Dropout Voltage vs. Temperature
DROPOUT VOLTAGE (mV)
160 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 120 VOUT1, 2 = 150mA VOUT1, 2 = 300mA VOUT2 = 500mA
OUTPUT VOLTAGE (V)
500mA
2.4 2.2 2 1.8 1.6 1.4 2.5 3 3.5 4 4.5 5 5.5 VOUT2 = 2.8V CIN = COUT = 2.2F
Current Limit (mA)
2.6
VOUT2 800 700 600 VOUT1 500 400 2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Input Voltage(V)
TEMPERATURE (C)
Dropout Voltage vs. Output Current
140
3.6
Output Voltage vs. Output Current
Output Noise Spectral Density
1 0
DROPOUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
120 100 80 60 40 20 0 0 50 100 150 200 250 300 350 400 450 500 VOUT2 = 2.8V VEN1 = 0.0V
3.4 VOUT1 3.2 3 2.8 2.6 2.4 0 50 100 150 200 250 300 350 400 450 500
0.001 1 0 1 00 1 ,000 1 0,000 1 00,000 1 ,000,000 1 0,000,000 1
NOISE V/Hz
0.1
VOUT2
VIN = 4.3V CIN = COUT = 2.2F
0.01
VIN = 4.5V COUT = 2.2F VOUT1 = 2.8V ILOAD = 75mA
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
FREQUENCY (Hz)
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Typical Characteristics (Continued)
Power Supply Rejection Ratio
-1 00 -90 -80 -70
PSRR (dB)
-60 -50 -40 -30 -20 -1 0 0 1 0 1 00 1 ,000 1 0,000 1 00,000
1 00uA 500mA 300mA
VIN = 3.8V VOUT2 = 3.3V COUT = 2.2F CBYP = 0.1F
1 ,000,000 1 0,000,000
FREQUENCY (Hz)
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Functional Characteristics
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MIC5350 A unique, quick-start circuit allows the MIC5350 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. No-Load Stability Unlike many other voltage regulators, the MIC5350 will remain stable with no load. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC5350 is designed to provide 300mA of continuous current for VOUT1 and 500mA for VOUT2 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 3.3V, the output voltage is 2.8V for VOUT1, 2.8V for VOUT2 and the output current 300mA and 500mA respectively. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT1) IOUT1 + (VIN - VOUT2) IOUT2+ 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 + (3.3V -2.8) x 500mA PD = 0.4W 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:
Applications Information
Enable/Shutdown The MIC5350 comes with dual active-high enable pins that allow each regulator to be enabled independently. Forcing both enable pins low disables the regulators 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 MIC5350 is a high-performance, high-bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 2.2F 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 high-frequency noise and are good practice in any RF-based circuit. Output Capacitor The MIC5350 requires an output capacitor of 2.2F 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 2.2F ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their superior 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-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.
PD(MAX) =

TJ(MAX) - TA
JA
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 90C/W.
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Micrel, Inc. 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 90C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5350-MMYMT at an input voltage of 3.3V with 300mA on VOUT1 and 500mA on VOUT2 and a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.4W = (125C - TA)/(90C/W) TA = 89C
MIC5350
Therefore, a 2.8V/2.8V application with 300mA and 500mA output currents can accept an ambient operating temperature of 89C in a 2mm x 2mm 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
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Typical Application Schematic
Bill of Materials
Item C1 C2 C3, C4 R1, R2 U1
Notes:
Part Number C1608X5R0J106M VJ0603Y104KXQ C1608X5R0J225M CRCW06031002FKEYE3 MIC5350-XXYML
Manufacturer TDK
(1) (2)
Description Capacitor, 10F Ceramic, 6.3V, X5R, Size 0603 Capacitor, 0.1F Ceramic, 10V, X7R, Size 0603 Capacitor, 2.2F Ceramic, 6.3V, X5R, Size 0603 Resistor, 10k, 1%, 1/16W, Size 0603
Qty. 1 1 2 2
(R)
Vishay TDK
(1)
Vishay(2) Micrel, Inc.
(3)
Dual 300mA/500mA LDO, 2mm x 2mm Thin MLF
1
1. TDK: www.tdk.com. 2. Vishay Tel: www.vishay.com.
3. Micrel, Inc.: www.micrel.com.
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PCB Layout Recommendations
TOP LAYER
BOTTOM LAYER
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Package Information
8-Pin 2mm x 2mm TMLF (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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