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MIC5259
300mA High PSRR, Low Noise Cap CMOS LDO
General Description
The MIC5259 is an efficient CMOS voltage regulator optimized for low-noise applications. It offers 1.5% initial accuracy, low dropout voltage (300mV at 300mA) and low ground current (typically 105A at light load). The MIC5259 provides a very-low-noise output, ideal for RF applications where a clean voltage source is required. The MIC5259 has a high PSRR even at low supply voltages, critical for battery operated electronics. A noise bypass pin is also available for further reduction of output noise. Designed specifically for handheld and battery-powered devices, the MIC5259 provides a TTL-logic-compatible enable pin. When disabled, power consumption drops to nearly zero. The MIC5259 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications; critical issue in handheld wireless devices. Key features include current limit, thermal shutdown, faster transient response, and an active clamp to speed up device turn-off. The MIC5259 is available in the 6-pin 2mm x 2mm MLF(R) package and the 5-pin Thin SOT-23 package in a wide range of output voltages. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * Input voltage range: 2.7V to 6.0V PSRR = 70dB @ 1kHz Low output noise: 30V(rms) Stability with ceramic output capacitors Low-dropout: 300mV @ 300mA High-output accuracy: - 1.5% initial accuracy - 3.0% over temperature Low quiescent current: 105A Tight load and line regulation TTL-Logic-controlled enable input "Zero" off-mode current Thermal shutdown and current limit protection
* * * * *
Applications
* * * * * * * Cellular phones and pagers Cellular accessories Battery-powered equipment Laptop, notebook, and palmtop computers Consumer/personal electronics Industrial portable electronics PC peripherals
Typical Application
CIN = 1.0F Ceramic
Enable Shutdown
VIN MIC5259-x.xBD5/YD5
1 2 3 4 5
VOUT COUT = 1.0F Ceramic CBYP = 0.01F
ENABLE SHUTDOWN
VIN EN
MIC5259-x.xBML/YML
1 2 6 5 4
VOUT CBYP (optional) 0.01F COUT = 1.0F
EN
CIN = 1.0F
EN (pin 3) may be connected directly to IN (pin 1).
3
Ultra-Low Noise Regulator 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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Ordering Information(1)
Part Number Standard MIC5259-1.5BD5 MIC5259-1.8BD5 MIC5259-2.5BD5 MIC5259-2.8BD5 MIC5259-2.85BD5 MIC5259-3.0BD5 MIC5259-3.3BD5 Pb-Free MIC5259-1.5YD5 MIC5259-1.8YD5 MIC5259-2.5YD5 MIC5259-2.8YD5 MIC5259-2.85YD5 MIC5259-3.0YD5 MIC5259-3.3YD5 MIC5259-1.5YML MIC5259-1.8YML MIC5259-2.1YML MIC5259-2.5BML MIC5259-2.8BML MIC5259-2.85BML MIC5259-3.0BML MIC5259-3.3BML
* **
Marking Standard NY15 NY18 NY25 NY28 NY2J NY30 NY33 Pb-Free* NY15 NY18 NY25 NY28 NY2J NY30 NY33 Y15 Y18 Y21 Y25 Y28 Y2J Y30 Y33 Y25 Y28 Y2J Y30 Y33 Voltage 1.5V 1.8V 2.5V 2.8V 2.85V 3.0V 3.3V 1.5V 1.8V 2.1V 2.5V 2.8V 2.85V 3.0V 3.3V
Junction Temp. 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
Package 5-Pin Thin SOT23-5 5-Pin Thin SOT23-5 5-Pin Thin SOT23-5 5-Pin Thin SOT23-5 5-Pin Thin SOT23-5 5-Pin Thin SOT23-5 5-Pin Thin SOT23-5 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)
MIC5259-2.5YML MIC5259-2.8YML MIC5259-2.85YML MIC5259-3.0YML MIC5259-3.3YML
6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R) 6-Pin 2mm x 2mm MLF(R)
Under bar / Over bar symbol ( _ /
) may not be to scale.
Other voltages available, please contact Micrel Marketing for details.
Pin Configuration
EN GND IN
3 2 1
EN 1
6
BYP NC OUT
NYxx NYxx
4 5
Yxx
GND 2 5
Yxx
IN 3 4
BYP
OUT
MIC5259-x.xBD5/YD5 5-Pin Thin SOT-23 (D5) (Top View)
MIC5259-x.xBML/YML (R) 6-Pin 2mm x 2mm MLF (ML) (Top View)
Pin Description
Pin Number TSOT-23-5 1 2 3 4 5 Pin Number MLF(R)-6 3 2 1 6 4 5 Pin Name IN GND EN BYP OUT NC Pin Name Supply Input Ground Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not leave open. Reference Bypass: Connect external 0.01F CBYP 1.0F capacitor to GND to reduce output noise. May be left open. Regulator Output No Connect
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN).................................... 0V to +7V Enable Input Voltage (VEN)................................... 0V to +7V Power Dissipation (PD) ........................... Internally Limited(3) Junction Temperature (TJ) ........................-40C to +125C Storage Temperature (TS)........................... -65C to 150C Lead Temperature (soldering, 5sec.)......................... 260C EDS Rating(4) .................................................................. 2kV
Operating Ratings(2)
Supply voltage (VIN) ........................................ +2.7V to +6V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Thermal Resistance TSOT-23 (JA)..................................................235C/W 2x2 MLF(R) (JA)...................................................90C/W
Electrical Characteristics(5)
VIN = VOUT + 1V; VEN = VIN; IOUT = 100A; TJ = 25C, bold values indicate -40C< TJ < +125C, unless noted.
Symbol VO VLRN VLDR VIN - VOUT Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage(7) Condition IOUT = 100A VIN = VOUT + 1V to 6V IOUT = 0.1mA to 300mA(6) IOUT = 150mA IOUT = 300mA VEN 0.4V (shutdown) IOUT = 0mA IOUT = 300mA f = 10Hz, COUT = 1.0F, CBYP = 0.01F f = 10Hz, VIN = VOUT + 0.3V f = 10kHz, VIN = VOUT + 0.3V VOUT = 0V COUT 1.0F, CBYP = 0.01F, f = 10Hz to 100kHz VIN = 2.7 to 5.5V, regulator shutdown VIN = 2.7V to 5.5V, regulator enabled VIL 0.4V, regulator shutdown VIH 1.6V, regulator enabled Min -1.5 -3 -0.3 Typ Max 1.5 3 0.3 3.0 500 550 1 150 250 Units % % %/V % mV mV mV A A A dB dB dB mA V(RMS)
0.02 0.6 150 300 0.2 105 120 65 53 53 475 30
IQ IGND PSRR
Quiescent Current Ground Pin Current(8) Ripple Rejection; IOUT = 150mA
ILIM en Enable Input VIL VIH IEN
Current Limit Output Voltage Noise
350
Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current
0.4 1.6 0.01 0.01 500 150 10 1 1
Shutdown Resistance Discharge Thermal Protection Thermal Shutdown Temperature Thermal Shutdown Hysteresis
V V A A C C
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. The JA of the MIC5259-x.xBM5 (all versions) is 235C/W on a PC board. See "Thermal Considerations" section for further details. 4. Devices are ESD sensitive. Handling precautions recommended. 5. Specification for packaged product only. 6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 0.1mA to 300mA. 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 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating voltage is 2.7V. 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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Typical Characteristics
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Typical Characteristics (cont.)
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Functional Characteristics
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Functional Diagram
IN Reference Voltage EN Thermal Sensor Undervoltage Lockout Startup/ Shutdown Control Quickstart/ Noise Cancellation BYP
FAULT
Error Amplifier
Current Amplifier
OUT
ACTIVE SHUTDOWN
GND
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MIC5259 Bypass Capacitor A capacitor is required from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.01F 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 MIC5259 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. Active Shutdown The MIC5259 also features an active shutdown clamp, which is an N-Channel MOSFET that turns on when the device is disabled. This allows the output capacitor and load to discharge, de-energizing the load. No-Load Stability The MIC5259 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC5259 is designed to provide 300mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation:
TJ(max) - TA PD(max) = JA
Application Information
Enable/Shutdown The MIC5259 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. This part is CMOS and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Input Capacitor The MIC5259 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 high frequency 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 MIC5259 requires an output capacitor for stability. The design requires 1F or greater on the output to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The maximum recommended ESR is 300m. 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.
TJ(max) is the maximum junction temperature of the die, 125C, and TA is the ambient operating temperature. JA is layout dependent; Table 1 shows examples of junction-to-ambient thermal resistance for the MIC5259.
Package SOT-23-5 (M5 or D5) MLF (ML) JA Recommended Minimum Footprint 235C/W 90C/W JA 1" Square Copper Clad 185C/W JC 145C/W
Table 1. Thermal Resistance
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Micrel, Inc. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT) IOUT + VIN IGND Substituting PD(max) for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the MIC5259-2.8BML at 70C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows:
MIC5259 The junction-to-ambient thermal resistance for the minimum footprint is 90C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 2.8V and an output current of 200mA, the maximum input voltage can be determined. Because this device is CMOS and the ground current is typically 110A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. 611mW = (VIN - 2.8V) 200mA 611mW = VIN x 200mA - 560mW 1171mW = VIN x 200mA VIN(max) = 5.85V Therefore, a 2.8V application at 200mA of output current can accept a maximum input voltage of 5.85V in an MLF 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.
125C - 70C PD(max) = 90C/W
PD(max) = 611mW
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Package Information
5-Pin Thin SOT-23 (D5)
6-Pin 2mm x 2mm MLF(R) (ML)
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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) 2004 Micrel, Incorporated.
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