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MIC5252
Micrel
MIC5252
150mA High PSRR, Low Noise Cap CMOS LDO
General Description
The MIC5252 is an efficient, precise CMOS voltage regulator optimized for ultra-low-noise applications. It offers 1% initial accuracy, extremely-low dropout voltage (135mV at 150mA) and low ground current (typically 90A). The MIC5252 provides a very-low-noise output, ideal for RF applications where a clean voltage source is required. The MIC5252 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 MIC5252 provides a TTL-logic-compatible enable pin. When disabled, power consumption drops nearly to zero. The MIC5252 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical 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 MIC5252 is available in the 6-pin 2mm x 2mm MLFTM package and the IttyBitty(R) SOT-23-5 package in a wide range of output voltages.
Features
* * * * * * Input voltage range: 2.7V to 6.0V PSRR = 50dB @ VO + 0.3V Ultra-low output noise: 30V(rms) Stability with ceramic output capacitors Ultra-low dropout: 135mV @ 150mA High output accuracy: 1.0% initial accuracy 2.0% over temperature Low quiescent current: 90A 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
Typical Application
MIC5252-x.xBM5
1 2 3 4 5
VIN
CIN = 1.0F Ceramic
Enable Shutdown
VIN
VOUT COUT = 1.0F Ceramic CBYP = 0.01F
MIC5252-x.xBML
1 2 3 6 5 4
VOUT CBYP (optional) COUT
ENABLE SHUTDOWN
EN
EN
EN (pin 3) may be connected directly to IN (pin 1).
Ultra-Low-Noise Regulator Application
IttyBitty is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology. Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
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Ordering Information
Part Number MIC5252-1.8BM5 MIC5252-2.5BM5 MIC5252-2.8BM5 MIC5252-2.85BM5 MIC5252-3.0BM5 MIC5252-4.75BM5 MIC5252-2.8BML MIC5252-2.85BML MIC5252-3.0BML Marking L618 L625 L628 L62J L630 L64H 628 62J 630 Voltage 1.8V 2.5V 2.8V 2.85V 3.0V 4.75V 2.8V 2.85V 3.0V 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 Package SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 6-Pin 2x2 MLFTM 6-Pin 2x2 MLFTM 6-Pin 2x2 MLFTM
Other voltages available. Contact Micrel for details.
Pin Configuration
EN GND IN
3 2 1
EN 1 GND 2
6 BYP 5 NC 4 OUT
L6xx
4 5
BYP
OUT
IN 3
MIC5252-x.xBM5 SOT-23-5 (M5) (Top View)
MIC5252-x.xBML 6-Pin 2mm x 2mm MLFTM (ML) (Top View)
Pin Description
Pin Number SOT-23-5 1 2 3 4 5 - - Pin Number 6-MLFTM 3 2 1 6 4 5 EP Pin Name IN GND EN BYP OUT NC GND Pin Function 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.
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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 ............................... -65C to +150C Lead Temperature (soldering, 5 sec.) ....................... 260C ESD(4) .............................................................................................. 2kV Electrical Characteristics(5)
Symbol VO VLNR VLDR VIN - VOUT Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage(7) Conditions IOUT = 100A
Operating Ratings(2)
Input Voltage (VIN) ......................................... +2.7V to +6V Enable Input Voltage (VEN) .................................. 0V to VIN Junction Temperature (TJ) ....................... -40C to +125C Thermal Resistance SOT-23 (JA) .....................................................235C/W 2x2 MLFTM (JA) .................................................. 90C/W
VIN = VOUT + 1V, VEN = VIN; IOUT = 100A; TJ = 25C, bold values indicate -40C TJ +125C; unless noted. Min -1 -3 0.02 0.6 0.1 90 135 0.2 90 117 63 48 48 250 425 30 Typical Max 1 3 0.05 1.5 5 150 200 250 1 150 200 Units % % %/V % mV mV mV mV A A A dB dB dB mA V(rms)
VIN = VOUT + 1V to 6V IOUT = 0.1mA to IOUT = 100A IOUT = 100mA IOUT = 150mA 150mA(6)
IQ IGND PSRR
Quiescent Current Ground Pin Current(8)
VEN 0.4V (shutdown) IOUT = 0mA IOUT = 150mA f = 10Hz, COUT = 1.0F, CBYP = 0.01F f = 10Hz, VIN = VOUT + 0.3V f = 10kHz, VIN = VOUT + 0.3V
Ripple Rejection; IOUT = 150mA
ILIM en Enable Input VIL VIH IEN
Current Limit Output Voltage Noise
VOUT = 0V COUT = 1.0F, CBYP = 0.01F, f = 10Hz to 100kHz
Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current
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 1.6 0.01 0.01 500
0.4
V V A A C C
1 1
Shutdown Resistance Discharge Thermal Protection Thermal Shutdown Temperature Thermal Shutdown Hysteresis
150 10
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 MIC5252-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 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
PSRR with Bypass Variation (VIN = VOUT + 0.3V)
PSRR with Bypass Cap Variation (VIN = VOUT + 1V)
10nF 1F
PSRR with Load Variation
90 80 70 PSRR (dB)
100A
90 80 70 PSRR (dB) 60 50 40 30 20 10
90 80 70 PSRR (dB) 60 50 40 30 20 10
100nF 1F
100nF
60 50 40 30 20
C C
OUT BYP
0nF
150mA
10nF
0nF
COUT = 1F Ceramic VIN = VOUT + 0.3V VOUT = 2.8V Load = 150mA
C
OUT
= 1F Ceramic
= 1F Ceramic = 10nF
VIN = VOUT + 1V VOUT = 2.8V Load = 150mA
0 10
10k 100k 1k 100 FREQUENCY (Hz)
1M
0 10
10k 100k 100 1k FREQUENCY (Hz)
1M
10 10
VIN = VOUT + 1V VOUT = 2.8V
10k 100k 1k 100 FREQUENCY (Hz)
1M
PSRR at 100Hz
90
OUTPUT VOLTAGE (V) 2.85
Output Voltage vs. Load Current
2.84 OUTPUT VOLTAGE (V) 2.82 2.8 2.78 2.76 2.74 2.72 2.83 2.81 2.79 2.77 2.75 2.73 2.71 2.69 2.67 2.65 0 2.8VOUT 20 40 60 80 100 120 140 OUTPUT CURRENT (mA)
Output Voltage vs. Temperature
80 70
PSRR (dB)
100A
60 50 40 30 20 10
0 100 200 300 400 500
150mA
COUT = 1F CBYP = 10nF VOUT 2.8V
1000 600 700 800 900
0
100A 2.7 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
VOLTAGE DROP (mV)
Ground Current vs. Output Current
140 GROUND CURRENT (A) GROUND CURRENT (A) 120 100 80 60 40 20 0 0 2.8VOUT 20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA) 160 140 120 100
Ground Current vs. Temperature
120 GROUND CURRENT (A) 150mA Load 100 80 60 40 20
Ground Current vs. Supply Voltage
1A Load 100A Load 0A Load
80 0mA Load 60 40 20 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 SUPPLY VOLTAGE (V)
Ground Current vs. Supply Voltage
140
GROUND CURRENT (A)
Dropout Characteristics
3 200 180 160 140 120 100 80 60 40 20
Dropout vs. Temperature
DROPOUT VOLTAGE (mV)
10mA Load
OUTPUT VOLTAGE (V)
120 100 80 60 40 20
2.5 2 1.5 1 0.5
100A 150mA
150mA Load
2.8VOUT IL = 150mA
0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 SUPPLY VOLTAGE (V)
0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 SUPPLY VOLTAGE (V)
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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Dropout vs. Output Current
200
Enable Threshold vs. Supply Voltage
1.4 ENABLE THRESHOLD (V) ENABLE THRESHOLD (V) 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2 SUPPLY VOLTAGE (V) Enable Off Enable On 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7
Enable Threshold vs. Temperature
V = 5V
180 160 DROPOUT (mV) 140 120 100 80 60 40 20 0 0 2.8V
OUT
IN
V
IN
= 3.8V
20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA)
0.6 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Short Circuit Current vs. Input Supply Voltage
SHORT CIRCUIT CURRENT (mA) 500 450 400 350 300 250 200 150 100 50 0 2.7 2.8VOUT 3.2 3.7 4.2 4.7 5.2 SUPPLY VOLTAGE (V)
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Functional Characteristics
Enable Pin Delay
Enable Voltage (1V/div)
Load Transient Response
Output Voltage (50mV/div)
VOUT = 2.85V VIN = 3.6V COUT = 1F Ceramic 150mA 100A
TIME (10s/div)
Output Current (100mA/div)
Output Voltage (1V/div)
TIME (40s/div)
Line Transient Response
Output Voltage (200mV/div)
5V 3.3V
Input Voltage (1V/div)
50mA Load
TIME (10s/div)
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Block Diagram
IN Reference Voltage Startup/ Shutdown Control Quickstart/ Noise Cancellation BYP
EN
Thermal Sensor Undervoltage Lockout
FAULT
Error Amplifier
Current Amplifier
OUT
ACTIVE SHUTDOWN
GND
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No-Load Stability The MIC5252 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 MIC5252 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:
T (max) - TA PD (max) = J JA
Applications Information
Enable/Shutdown The MIC5252 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-modecurrent 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 MIC5252 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 MIC5252 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. X7Rtype 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 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 MIC5252 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 MIC5252 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. 8
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-toambient thermal resistance for the MIC5252.
Package SOT-23-5 (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 MIC5252-2.8BM5 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 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 2.8V 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 - 2.8V) 150mA 315mW = VIN x 150mA - 420mW 735mW = VIN x 150mA VIN(max) = 4.9V Therefore, a 2.8V application at 150mA of output current can accept a maximum input voltage of 4.9V in a SOT-23-5 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 Low-Dropout Voltage Regulators handbook. December 2003
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Package Information
1.90 (0.075) REF 0.95 (0.037) REF
1.75 (0.069) 1.50 (0.059)
3.00 (0.118) 2.60 (0.102)
DIMENSIONS: MM (INCH) 3.02 (0.119) 2.80 (0.110) 1.30 (0.051) 0.90 (0.035) 10 0 0.15 (0.006) 0.00 (0.000) 0.20 (0.008) 0.09 (0.004)
0.50 (0.020) 0.35 (0.014)
0.60 (0.024) 0.10 (0.004)
SOT-23-5 (M5)
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN MILLIMETERS
SIDE VIEW
Rev. 02
6-Pin MLFTM (ML)
MICREL, INC.
TEL
1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
FAX
+ 1 (408) 944-0800
+ 1 (408) 944-0970
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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2003 Micrel, Incorporated.
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