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MIC5327
300mA Low Quiescent Current LDO
General Description
The MIC5327 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. The MIC5327 is capable of sourcing 300mA of output current while only consuming 24A of operating current. This high performance LDO offers Low dropout, fast transient response, good PSRR, and low output voltage noise. The MIC5327 is an ideal solution for battery operated applications due to ultra low quiescent current and extremely low dropout voltage of 180mV at 300mA. Equipped with a TTL logic compatible enable pin, the MIC5327 can be put into a zero-off-mode current state, drawing virtually no current when disabled. Board space and component cost is minimized because the MIC5327 operates with very small 1F ceramic capacitors, provides fixed output voltages, and is available in the tiny 1.2mm x 1.6mm Thin MLF(R) package. MIC5327 also features thermal shutdown and current limit protection. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * 300mA output current Input voltage range: 2.3V to 5.5V Low 24A operating current Low dropout voltage of 180mV @ 300mA Fixed output voltages Stable with 1F ceramic capacitors Thermal shutdown and current limit protection Tiny 4-pin 1.2mm x 1.6mm Thin MLF(R) package
Applications
* * * * * * Mobile Phones GPS and Navigation Devices Portable Media Players Digital still and video cameras PDAs Portable Electronics
___________________________________________________________________________________________________________
Typical Application
MIC5327-xxYMT VIN VOUT VOUT
VBAT
1F
VEN GND
1F
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
September 2008
M9999-093008-A
Micrel, Inc.
MIC5327
Ordering Information
Part Number MIC5327-2.8YMT MIC5327-1.8YMT
Note: 1. 2. 3. Pin 1 identifier = "". For other voltage options contact Micrel Marketing. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu, Mold compound is Halogen Free.
Marking(1) 2O8 1Q8
Voltage(2) 2.8V 1.8V
Temperature Range -40 to +125C -40 to +125C
Package(3) 4-Pin 1.2mm x 1.6mm Thin MLF(R) 4-Pin 1.2mm x 1.6mm Thin MLF(R)
Pin Configuration
VIN 1 GND 2
4 3
VOUT EN
4-Pin 1.2mm x 1.6mm Thin MLF(R) (MT)
Pin Description
Pin Number 1 2 3 4 HSPAD Pin Name VIN GND EN VOUT EPAD Pin Function Supply Input. Ground. Enable Input: Active High Input. Logic High = On; Logic Low = Off. Do not leave floating. Output Voltage. Exposed heatsink pad connected to ground internally.
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) ........................................ -0.3V to +6V Enable Voltage (VEN)......................................... -0.3V to VIN Power Dissipation (PD) ........................... Internally Limited(3) Lead Temperature (soldering, 5 sec.)........................ 260C Junction Temperature (TJ ).........................-40C to +125C Storage Temperature (TS)..........................-65C to +150C ESD Rating(4) .................................................................. 2kV
Operating Ratings(2)
Supply Voltage (VIN)....................................... +2.3V to 5.5V Enable Voltage (VEN).............................................. 0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Junction Thermal Resistance 1.2mm x 1.6mm Thin MLF-4 (JA) ............................173C/W
Electrical Characteristics(5)
VIN = VEN = VOUT + 1V; COUT = CIN = 1F; IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C unless noted.
Parameter Output Voltage Accuracy Line Regulation Load Regulation
(6)
Condition Variation from nominal VOUT Variation from nominal VOUT VIN = VOUT +1V to 5.5V, IOUT = 100A VIN = VOUT +1V to 5.5V, IOUT = 100A IOUT = 100A to 300mA IOUT = 50mA IOUT = 100mA IOUT = 150mA IOUT = 300mA
Min -1.5 -2.0
Typ
Max +1.5 +2.0
Units % % %/V %/V % mV mV
0.01 0.05 30 55 85 180 24 0.01 60 50 400 600 90
0.3 0.5 1
Dropout Voltage(7)
150 300 35 1
mV mV A A dB dB
Ground Pin Current Ripple Rejection Current Limit
(8)
IOUT = 100A to 300mA VEN = 0V f = 1kHz; COUT = 1F; IOUT = 300mA f = 20kHz; COUT = 1F; IOUT = 300mA VOUT = 0V COUT = 1F, 10Hz to 100kHz Logic Low Logic High 1.2 VIL 0.2V VIH 1.2V COUT = 1F; IOUT = 300mA
Ground Pin Current in Shutdown
950
mA VRMS
Output Voltage Noise Enable Voltage Enable Voltage Enable Current Turn-on Time
Notes:
0.2 0.01 0.01 150 1 1 500
V V A A 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, 1.5k in series with 100pF. 5. Specification for packaged product only. 6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. 7. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. 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.
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MIC5327
Typical Characteristics
Power Supply Rejection Ratio
50mA 100mA 100A 150mA 300mA VEN = 1.2V VOUT = 2.8V COUT = 1F 100 1k 10k 100k FREQUENCY (Hz) 1M 32
Ground Current vs. Output Current
32
Ground Current vs. Input Voltage
28
28
100A
24
24 300mA 150mA
20
0 10
16 0
VIN = VEN = 3.8V VOUT = 2.8V CIN = COUT = 1F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
20
16 3.0
VIN = VEN = 3.8V VOUT = 2.8V CIN = COUT = 1F 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5
32
Ground Current vs. Temperature
3.5
Output Voltage vs. Input Voltage
2.90
Output Voltage vs. Temperature
28 3.0 24 300mA 20 100A 150mA 2.5 100A
2.85
2.80
150mA 50mA 300mA VEN = VIN VOUT = 2.8V CIN = COUT = 1F 5.5
2.75 VEN = VIN = 3.8V CIN = COUT = 1F
16 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
VIN = VEN = 3.8V VOUT = 2.8V CIN = COUT = 1F
2.0 2.5
3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V)
2.70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
1.810
Output Voltage vs. Output Current
250 200 150
Dropout Voltage vs. Temperature
200 180 160 140 120 100 80 60
Dropout Voltage vs. Output Current
1.805
1.800 100 1.795 VEN = VIN = 2.8V CIN = COUT = 1F 50 100 150 200 250 300 OUTPUT CURRENT (mA) 50 VOUT = 2.8V CIN = COUT = 1F ILOAD = 300mA
40 20 0 0
1.790 0
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
VEN = VIN CIN = COUT = 1F 50 100 150 200 250 300 OUTPUT CURRENT (mA)
700 650 600 550 500
Current Limit vs. Input Voltage
VOUT = 2.8V VEN = 1.2V CIN = COUT = 1F
100
Output Noise Spectral Density
VIN = 4.5V VOUT = 2.8V COUT = 1F 10 I LOAD 1
0.1 450 400 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 0.01 10 100 1k 10k 100k FREQUENCY (Hz) 1M
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MIC5327
Functional Characteristics
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MIC5327
Functional Diagram
VIN EN
LDO
VOUT
REFERENCE
GND
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MIC5327 uses CMOS technology and cannot be left floating; a floating enable pin may cause an unknown output state. Thermal Considerations The MIC5327 is designed to provide 300mA continuous output current from a very small footprint package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. For example: given that the input voltage is 3.6V, the output voltage is 2.8V and the output current is 300mA. The power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT1) I OUT + 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 use the junction to ambient thermal resistance of the device and the following basic equation:
TJ(max) - TA PD(max) = JA
Applications Information
The MIC5327 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. The MIC5327 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Input Supply Voltage VIN provides the supply to power the LDO. The minimum input voltage is 2.3V allowing conversion from typical lithium ion batteries and low voltage supplies. Input Capacitor The MIC5327 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 with minimum space required. Additional high frequency capacitors, such as small value NPO dielectric type capacitors, help filter out high frequency noise and are good practice in any RF circuit. Output Capacitor The MIC5327 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. 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. 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. Minimum Load Current The MIC5327 does not require a minimum load to maintain output voltage regulation. Enable/Shutdown The MIC5327 comes with an active high enable pin that enables the regulator. 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. The active high enable pin
The maximum junction temperature of the die, TJ(max) = 125C.The package thermal resistance, JA = 173C/W. Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5327 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 300mA application can accept an ambient operating temperature of 83.0C in a 1.2mm 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
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MIC5327
U1 MIC5327-xxYMT J1 VIN C1 1F/6.3V
3 1
VIN
VOUT
4
J3 VOUT C2 1F/6.3V
J5 GND J2 GND
EN
GND
2
J4 GND
Bill of Materials
Item C1, C2 U1
Notes: 1. TDK: www.tdk.com 2. Vishay Dale: Vishay.com 3. Micrel, Inc.: www.micrel.com
Part Number C1608X5R0J105K MIC5327-xxYMT
Manufacturer TDK(1) Micrel, Inc.
(3)
Description Capacitor, 1F, 6.3V, X5R, Size 0603 300mA Low operating current LDO
Qty. 2 1
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MIC5327
PCB Layout Recommendations
Top Layer
Bottom Layer
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MIC5327
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) 2008 Micrel, Incorporated.
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