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MIC5319
500mA Cap Ultra-Low Dropout High PSRR LDO Regulator
General Description
The MIC5319 is a high-performance, 500mA LDO regulator, offering extremely high PSRR and very-low noise while consuming low ground current. Ideal for battery-operated applications, the MIC5319 features 1% accuracy, extremely low-dropout voltage (200mV @ 500mA), and low ground current at light load (typically 90A). Equipped with a logic-compatible enable pin, the MIC5319 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5319 is a Cap design operating with very-small ceramic output capacitors for stability, thereby reducing required board space and component cost. The MIC5319 is available in fixed-output voltages and adjustable output voltages in the super-compact 2mm x 2mm MLF(R) leadless package and thin SOT-23-5 package. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * Ultra-low dropout voltage 200mV @ 500mA Input voltage range: 2.5 to 5.5V Stable with ceramic output capacitor Low output noise: 40Vrms Low quiescent current of 90A total High PSRR, up to 70dB @1kHz Fast turn-on-time: 40s typical High-output accuracy: - 1.0% initial accuracy - 2.0% over temperature Thermal-shutdown protection Current-limit protection Logic-controlled Enable Tiny 2mm x 2mm MLF(R) package, 500mA continuous Thin SOT-23-5 package, 500mA peak
* * * * *
Applications
* * * * * * Cellular phones PDAs Fiber optic modules Portable electronics Notebook PCs Audio Codec power supplies
Typical Application
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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MIC5319
Ordering Information
Part Number Standard Pb-Free MIC5319-1.3HYML MIC5319-1.8BML MIC5319-1.8YML MIC5319-1.85YML MIC5319-2.5BML MIC5319-2.5YML MIC5319-2.6YML MIC5319-2.7YML MIC5319-2.8BML MIC5319-2.8YML MIC5319-2.9YML MIC5319-3.0YML MIC5319-3.3BML MIC5319-5.0BML MIC5319BML MIC5319-3.3YML MIC5319-5.0YML MIC5319YML MIC5319-1.3HYD5 MIC5319-1.8YD5 MIC5319-1.85YD5 MIC5319-2.5YD5 MIC5319-2.6YD5 MIC5319-2.7YD5 MIC5319-2.8BD5 MIC5319-2.8YD5 MIC5319-2.9YD5 MIC5319-3.0YD5 MIC5319-3.3BD5 MIC5319-3.3YD5 MIC5319-5.0YD5
Notes: 1. 2. Under-bar/Over-bar symbols may not be to scale. For other output voltage options, contact Micrel Marketing.
Marking Standard Pb-Free(1) 13H 918 918 91J 925 925 926 927 928 928 929 930 933 950 9AA 933 950 9AA N13H N918 N91J N925 N926 N927 N928 N928 N929 N930 N933 N933 N950
Voltage(2) (V) 1.375 1.8 1.85 2.5 2.6 2.7 2.8 2.9 3.0 3.3 5.0 ADJ 1.375 1.8 1.85 2.5 2.6 2.7 2.8 2.9 3.0 3.3 5.0
Junction 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 -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 -40C to +125C -40C to +125C -40C to +125C
Package 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5 Thin SOT-23-5
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Pin Configuration
MIC5319-x.xBML/YML 6-Pin 2mm x 2mm MLF(R) (ML) Top View
MIC5319BML/YML (Adjustable) 6-Pin 2mm x 2mm MLF(R) (ML) Top View
MIC5319-x.xBD5/YD5 TSOT-23-5 (D5) Top View
Pin Description
Pin Number MLF(R)-6 Fixed 1 2 3 4 - 5 6 HS Pad Pin Number MLF(R)-6 Adjustable 1 2 3 4 5 - 6 HS pad 4 - Pin Number TSOT-23-5 Fixed 3 2 1 5 - Pin Name EN GND VIN VOUT ADJ NC BYP EPAD Pin Name Enable Input: Active High. High = ON, Low = OFF. Do not leave floating. Ground. Supply Input. Output Voltage. Adjustable Input: Connect to external resistor voltage divider network. No connection for fixed voltage parts Reference Bypass: Connect external 0.1F to GND for reduced output noise. May be left open. Exposed Heatsink Pad connected to ground internally
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN)...................................... 0V to 6V Enable Input Voltage (VEN)..................................... 0V to 6V Power Dissipation (PD) ........................... Internally Limited(3) Junction Temperature (TJ) ........................ -40C to +125C Storage Temperature (TS)......................... -65C to +150C Lead Temperature (soldering, 5sec.)......................... 260C ESD Rating(4) .................................................................. 3kV
Operating Ratings(2)
Supply Input Voltage (VIN)............................ +2.5V to +5.5V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Package Thermal Resistance MLF(R) (JA)..........................................................93C/W TSOT-23 (JA) ..................................................235C/W
Electrical Characteristics(4)
VIN = VOUT +1.0V; COUT = 2.2F; IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C, unless noted. Parameter Output Voltage Accuracy Feedback Voltage (ADJ Option) Line Regulation Load Regulation
(6)
Condition Variation from nominal VOUT Variation from nominal VOUT, IOUT = 100mA to 500mA
Min. -1.0 -2.0 1.2375 1.225
Typ.
Max. +1.0 +2.0
Units % V %/V % mV A A dB mA Vrms s V A
1.25 1.25 0.04 0.1 20 200 90 0.5 70 60 700 40 40
1.2625 1.275 0.3 0.5 40 400 150
VIN = VOUT +1V to 5.5V IOUT = 100A to 500mA IOUT = 50mA IOUT = 500mA IOUT = 0 to 500mA VEN 0.2V f = up to 1kHz; COUT = 2.2F ceramic; CBYP = 0.1 F f = 10kHz; COUT = 2.2F ceramic; CBYP = 0.1 F VOUT = 0V COUT = 2.2F; CBYP = 0.1 F; 10Hz to 100kHz COUT = 2.2F; CBYP = 0.1 F Logic Low (Regulator Shutdown) Logic High (Regulator Enabled) VIL = 0.2V (Regulator Shutdown) VIH = 1.0V (Regulator Shutdown) 1.2 600
Dropout Voltage(7, 8) Ground Pin Current(9) Ground Pin Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise Turn-On Time Enable Input Voltage Enable Input Current
Notes: 1. 2. 3. 4. 5. 6. 7. 8. 9.
100 0.2
0.01 0.01
1 1
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. 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 may go into thermal shutdown. Devices are ESD sensitive. Handling precautions recommended. Human body model. Specification for packaged product only. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below 2.5V, dropout voltage spec does not apply, as part is limited by minimum VIN spec of 2.5V. There may be some typical dropout degradation at VOUT <3V. For ADJ option, VOUT = 3V for dropout specification. 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
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Typical Characteristics (Continued)
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Functional Characteristics
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Functional Diagram
MIC5319 Block Diagram - Fixed
MIC5319 Block Diagram - Adjustable
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MIC5319 A unique, quick-start circuit allows the MIC5319 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the "Typical Characteristics" section for performance with different bypass capacitors. No-Load Stability Unlike many other voltage regulators, the MIC5319 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 MIC5319 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
Applications Information
Enable/Shutdown The MIC5319 features 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, as this may cause an indeterminate state on the output. Input Capacitor The MIC5319 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 high-frequency noise and are good design practice in any RF-based circuit. Output Capacitor The MIC5319 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 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 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.
VREF = 1.25V
Figure 1. Adjustable Voltage Application
Thermal Considerations The MIC5319 is designed to provide 500mA of continuous current in a very small MLF(R) package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given an input voltage of 3.3V, output voltage of 2.8V and output current = 500mA, the actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT)IOUT + VIN x 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 0.25W =
MIC5319 Substituting 0.25W 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.
125C - TA 93C/W
TA = 101.75C 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:
TJ(max) - TA PD(max) = JA
Therefore, a 2.8V application at 500mA of output current can accept an ambient operating temperature of 101.75C in a 2mm x 2mm 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: www.micrel.com/_PDF/other/LDOBk_ds.pdf
TJ(max) = 125C, the maximum junction temperature of the die. JA thermal resistance = 93C/W. Table 1 shows junction-to-ambient thermal resistance for the MIC5319 in the 2mm x 2mm MLF(R) package.
JA Recommended Minimum Footprint 93C/W 235C/W Table 1. Thermal Resistance
Package 2mm x 2mm MLF(R) SOT-23-5
JC 45C/W
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Package Information
6-Pin 2mm x 2mm MLF(R) (ML)
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Package Information (Continued)
TSOT-23-5 (D5)
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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