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MIC5255
150mA Low Noise Cap CMOS LDO
General Description
Features
The MIC5255 is an efficient, precise CMOS voltage * Input voltage range: 2.7V to 6.0V regulator optimized for ultra-low-noise applications. It * Thin SOT package: 1mm height SOT-23-5 offers 1% initial accuracy, extremely-low dropout voltage * Ultra-low output noise: 30V(rms) (135mV at 150mA) and low ground current (typically * Stability with ceramic output capacitors 90A). The MIC5255 provides a very-low-noise output, * Ultra-low dropout: 135mV @ 150mA ideal for RF applications where a clean voltage source is required. A noise bypass pin is also available for further * High output accuracy: reduction of output noise. - 1.0% initial accuracy Designed specifically for handheld and battery-powered - 2.0% over temperature devices, the MIC5255 provides a TTL-logic-compatible en* Low quiescent current: 90A able pin. When disabled, power consumption drops nearly * Tight load and line regulation to zero. * TTL-Logic-controlled enable input The MIC5255 also works with low-ESR ceramic * "Zero" off-mode current capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless * Thermal shutdown and current limit protection devices. Key features include current limit, thermal shutdown, faster Applications transient response, and an active clamp to speed up (R) device turn-off. Available in the 6-pin 2mm x 2mm MLF * Cellular phones and pagers package, the IttyBitty(R) SOT-23-5 package and the new * Cellular accessories Thin SOT-23-5, which offers the same footprint as the * Battery-powered equipment standard IttyBitty(R) SOT-23-5, but only 1mm tall. The * Laptop, notebook, and palmtop computers MIC5255 offers a range of output voltages. * Consumer/personal electronics Data sheets and support documentation can be found on Micrel's web site at www.micrel.com. ___________________________________________________________________________________________________________
Typical Application
VIN MIC5255-x.x_M5
1 2 3 4 5
CIN = 1.0F Ceramic
Enable Shutdown
VOUT COUT = 1.0F Ceramic CBYP = 0.01F Ultra-Low-Noise Regulator Application
EN
EN (pin 3) may be connected directly to IN (pin 1).
IttyBitty is a registered 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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MIC5255
Ordering Information
Part Number Standard MIC5255-2.5BD5 MIC5255-2.5BM5 MIC5255-2.6BD5 MIC5255-2.6BM5 MIC5255-2.7BD5 MIC5255-2.7BM5 MIC5255-2.75BM5 MIC5255-2.8BD5 MIC5255-2.8BM5 MIC5255-2.8BML MIC5255-2.85BD5 MIC5255-2.85BM5 MIC5255-2.85BML MIC5255-2.9BD5 MIC5255-2.9BM5 MIC5255-3.0BD5 MIC5255-3.0BM5 MIC5255-3.0BML MIC5255-3.1BM5 MIC5255-3.2BM5 MIC5255-3.3BD5 MIC5255-3.3BM5 MIC5255-3.3BML MIC5255-3.5BM5
Notes: * ** *** Other Voltage available. Contact Micrel for details. Under bar / Over bar symbol may not be to scale. Over bar symbol located after Pin 1 identifier.
Marking Pb-Free Standard NW25 LW25 NW26 LW26 NW27 LW27 LW2H NW28 LW28 W28 NW2J LW2J W2J NW29 LW29 NW30 LW30 W30 LW31 LW32 NW33 LW33 W33 LW35 Pb-Free** NW25 KW25 NW26 KW26 NW27 KW27 KW2H NW28 KW28 W28*** NW2J KW2J W2J*** NW29 KW29 NW30 KW30 W30*** KW31 KW32 NW33 KW33 W33*** KW35
Voltage* 2.5V 2.5V 2.6V 2.6V 2.7V 2.7V 2.75V 2.8V 2.8V 2.8V 2.85V 2.85V 2.85V 2.9V 2.9V 3.0V 3.0V 3.0V 3.1V 3.2V 3.3V 3.3V 3.3V 3.5V
Junction Temp. Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C
Package 5-Pin TSOT-23 5-Pin SOT-23 5-Pin TSOT-23 5-Pin SOT-23 5-Pin TSOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin TSOT-23 5-Pin SOT-23 6-Pin 2x2 MLF
(R)
MIC5255-2.5YD5 MIC5255-2.5YM5 MIC5255-2.6YD5 MIC5255-2.6YM5 MIC5255-2.7YD5 MIC5255-2.7YM5 MIC5255-2.75YM5 MIC5255-2.8YD5 MIC5255-2.8YM5 MIC5255-2.8YML MIC5255-2.85YD5 MIC5255-2.85YM5 MIC5255-2.85YML MIC5255-2.9YD5 MIC5255-2.9YM5 MIC5255-3.0YD5 MIC5255-3.0YM5 MIC5255-3.0YML MIC5255-3.1YM5 MIC5255-3.2YM5 MIC5255-3.3YD5 MIC5255-3.3YM5 MIC5255-3.3YML MIC5255-3.5YM5
5-Pin TSOT-23 5-Pin SOT-23 6-Pin 2x2 MLF
(R)
5-Pin TSOT-23 5-Pin SOT-23 5-Pin TSOT-23 5-Pin SOT-23 6-Pin 2x2 MLF
(R)
5-Pin SOT-23 5-Pin SOT-23 5-Pin TSOT-23 5-Pin SOT-23 6-Pin 2x2 MLF
(R)
5-Pin SOT-23
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MIC5255
Pin Configuration
E N GND IN
3 2 1
E N GND IN
3 2 1
EN 1
6 BYP
LW xx
4 5 4
N W xx
5
Wxx
GND 2 IN 3 5 NC 4 OUT
BYP
OUT
BYP
OUT
MIC5255-x.xBML (R) 6-Pin 2x2 MLF (ML)
MIC5255-x.xBM5 5-Pin SOT23 (M5)
MIC5255-x.xBD5 5-Pin Thin SOT23 (D5)
E N GND IN
3 2 1
E N GND IN
3 2 1
EN 1
6 BYP
KW xx
4 5 4
N W xx
5
Wxx
GND 2 IN 3 5 NC 4 OUT
BYP
OUT
BYP
OUT
MIC5255-x.xYML (R) 6-Pin 2x2 MLF (ML)
MIC5255-x.xYM5 5-Pin SOT23 (M5)
MIC5255-x.xYD5 5-Pin Thin SOT23 (D5)
Pin Description
Pin Number SOT23-5 TSOT23-5 1 2 3 4 5 - - Pin Number 6-MLF 3 2 1 6 4 5 EP IN GND EN BYP OUT NC GND 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 internal connection. Ground: Internally connected to the exposed pad. Connect externally to GND pin. Pin Name Pin Name
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MIC5255
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ............................................. 0V to +7V Enable Voltage (VEN)............................................ 0V to +7V Power Dissipation (PD) ........................... Internally Limited(3) Junction Temperature (TJ) ........................-40C to +125C Storage Temperature (Ts) .........................-60C to +150C Lead Temperature (soldering, 5 sec.)........................ 260C EDS Rating(4) .................................................................. 2kV
Operating Ratings(2)
Supply Voltage (VIN)........................................ +2.7V to +6V Enable Voltage (VEN).............................................. 0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Thermal Resistance SOT23-5 (JA) ..................................................235C/W 2x2 MLF-6 (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 VLNR 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 150mA IOUT = 100A IOUT = 100mA IOUT = 150mA
(6)
Min -1 -2
Typ
Max 1 2
Units % % %/V % mV mV mV mV A A A dB dB dB mV V(rms)
0.02 1.5 0.1 90 135 0.2 90 117 60 60 50 160 425 30
0.05 2.5 5 150 200 250 1 150
IQ IGND PSRR
Quiescent Current Ground Pin Current Ripple Rejection
(8)
VEN 0.4V (shutdown) IOUT = 0mA IOUT = 150mA f = 10Hz, COUT = 1.0F, CBYP = 0.01F f = 100Hz, VIN = VOUT +1 f = 10kHz, VIN = VOUT +1
ILIM en Enable Input VIL VIH IEN
Current Limit Output Voltage Noise
VOUT = 0V COUT = 1.0F, CBYP = 0.01F, f = 10Hz to 100kHz VIN = 2.7V to 5.5V, regulator shutdown VIN = 2.7V to 5.5V, regulator enabled VIL 0.4V, regulator shutdown VIH 1.6V, regulator enabled
Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current Shutdown Resistance Discharge
0.4 1.6 0.01 0.01 500 150 10
V V A A C C
Thermal Protection Thermal Shutdown Temperature Thermal Shutdown Hysteresis
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Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating.
MIC5255
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 MIC5255-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. 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. Parts are tested for load regulation in the load range from 1.0mA to 150mA. 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
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Functional Characteristics
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Functional Diagram
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MIC5255 large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the "Typical Characteristics" section for performance with different bypass capacitors.
Application Information
Enable/Shutdown The MIC5255 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 MIC5255 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 MIC5255 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. Bypass Capacitor A capacitor can be placed 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 MIC5255 to drive a
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Active Shutdown The MIC5255 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 MIC5255 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 MIC5255 is designed to provide 150mA 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
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 MIC5255.
Package SOT23-5 (M5 or D5) JA Recommended Minimum Footprint 235C/W JA 1" Square Copper Clad 185C/W JC 145C/W
Table 1. SOT-23-5 Thermal Resistance
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 MIC5255-3.0BM5 at 50C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows:
125C - 50C PD(max) = 235C/W
PD(max) = 315mW
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Micrel, Inc. The junction-to-ambient thermal resistance for the minimum footprint is 235C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.0V and an output current of 150mA, the maximum input voltage can be determined. 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: 315mW = (VIN - 3.0V) 150mA 315mW = VIN x 150mA - 450mW 810mW = VIN x 150mA VIN(max) = 5.4V
MIC5255 Therefore, a 3.0V application at 150mA of output current can accept a maximum input voltage of 5.4V in a SOT23-5 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 LowDropout Voltage Regulators handbook.
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Package Information
5-Pin SOT (M5)
5-Pin Thin SOT (D5)
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6-Pin MLF (ML)
(R)
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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