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MIC5252
Micrel, Inc.
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
C IN = 1.0F Ceramic
Enable Shutdown
V IN
MIC5252-x.xBM5
1 2 3 5
V OUT
C OUT = 1.0F Ceramic
VIN
ENABLE SHUTDOWN
MIC5252-x.xBML
1 2 3 6 5 4
VOUT CBYP
(optional)
EN
COUT
4
EN
EN (pin 3) m be ay connected directly to IN (pin 1).
C BYP = 0.01F
Ultra-Low-Noise Regulator Application
IttyBitty is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology. 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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MIC5252
Micrel, Inc. Part Number Marking Standard L618 L625 L628 L62J L630 L64H 628 62J 630 Pb-Free L618 L625 L628 L62J L630 L64H 628 62J 630
Ordering Information
Standard 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 Pb-Free MIC5252-1.8YM5 MIC5252-2.5YM5 MIC5252-2.8YM5 MIC5252-2.85YM5 MIC5252-3.0YM5 MIC5252-4.75YM5 MIC5252-2.8YML MIC5252-2.85YML MIC5252-3.0YML 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
3
IN
1
2
L6xx
4 5
EN 1 GND 2
OUT
6 BYP 5 NC 4 OUT
BYP
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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MIC5252
Micrel, Inc.
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
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
Electrical Characteristics(5)
Symbol VO VLNR VLDR VIN - VOUT VIN = VOUT + 1V, VEN = VIN; IOUT = 100A; TJ = 25C, bold values indicate -40C TJ +125C; unless noted. Parameter Conditions Min -1 -3 0.02 0.6 0.1 90 135 0.2 90 117 63 48 48 250 425 30 150mA(6) Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage(7) IOUT = 100A VIN = VOUT + 1V to 6V IOUT = 100A IOUT = 0.1mA to IOUT = 100mA IOUT = 150mA Typical Max 1 3 0.2 1.5 5 150 200 250 1 150 200 Units % % % % mV mV mV mV A A A dB dB dB mA
IQ
Quiescent Current Ground Pin Current(8) Ripple Rejection; IOUT = 150mA
IGND PSRR
VEN 0.4V (shutdown) IOUT = 150mA IOUT = 0mA
f = 10Hz, VIN = VOUT + 0.3V VOUT = 0V
f = 10Hz, COUT = 1.0F, CBYP = 0.01F
ILIM
Current Limit Output Voltage Noise
f = 10kHz, VIN = VOUT + 0.3V
en V(rms) Enable Input VIL
COUT = 1.0F, CBYP = 0.01F, f = 10Hz to 100kHz
Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current Shutdown Resistance Discharge
VIH IEN
VIN = 2.7V to 5.5V, regulator enabled VIL 0.4V, regulator shutdown VIH 1.6V, regulator enabled
VIN = 2.7V to 5.5V, regulator shutdown
0.4 1.6 0.01 0.01 500 150 10 1 1
V V A A C C
Thermal Protection Thermal Shutdown Temperature Thermal Shutdown Hysteresis
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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Micrel, Inc.
Typical Characteristics
P S R R with B ypas s V ariation (V IN = V OUT + 0.3V )
P S R R with B ypas s C ap V ariation (V IN = V OUT + 1V )
10nF
1F
P S R R with L oad V ariation
90 80 70
100A
90 80 70 60 PSRR (dB) 50 40 30 20 10
90 80 70 60 PSRR (dB) 50 40 30 20 10
100nF
1F
0nF
PSRR (dB)
100nF
60 50 40 30 20
C OUT = 1F C eramic C B Y P = 10nF V IN = V OUT + 1V V OUT = 2.8V
150mA
10nF
0nF
C OUT = 1F C eramic V IN = V OUT + 0.3V V OUT = 2.8V Load = 150mA
C OUT = 1F C eramic V IN = V OUT + 1V V OUT = 2.8V Load = 150mA
0 10
10k 100k 1k 100 FREQUENCY (Hz)
1M
0 10
10k 100k 1k 100 FREQUENCY (Hz)
1M
10 10
10k 100k 1k 100 FREQUENCY (Hz)
1M
PSR R at 100Hz
90 80 70 60
PSRR (dB)
Output V oltage vs . L oad C urrent
2.85 2.83 2.81 2.79 2.77 2.75 2.73 2.71 2.69 2.67 2.65 0
Output V oltage vs . T emperature
2.84 2.82 OUTPUT VOLTAGE (V) 2.8 2.78 2.76 2.74 2.72
100A
OUTPUT VOLTAGE (V)
50 40 30 20 10 0
150mA
C OUT = 1F C B Y P = 10nF V OUT 2.8V
2.8V OUT
20 40 60 80 100 120 140 OUTPUT CURRENT (mA)
0 100 200 300 400 500 600 700 800 900 1000
100A 2.7 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
VOLTAGE DROP (mV)
G round C urrent vs . Output C urrent
140 120 GROUND CURRENT (A) GROUND CURRENT (A) 100 80 60 40 20 0 0
G round C urrent vs . T emperature
160 140 GROUND CURRENT (A) 120 100 80 0mA Load 60 40 20 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 120 100 80 60 40 20
G round C urrent vs . S upply V oltage
1A Load 100A Load
150mA Load
0A Load
2.8V OUT
20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA)
0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 SUPPLY VOLTAGE (V)
G round C urrent vs . S upply V oltage
140 120 GROUND CURRENT (A) 100 80 60 40 20 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 SUPPLY VOLTAGE (V)
Dropout C harac teris tic s
3 2.5 OUTPUT VOLTAGE (V) 2 1.5 1 0.5 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 SUPPLY VOLTAGE (V)
Dropout vs . T emperature
200 180 160 140 120 100 80 60 40 2.8V OUT 20 I L = 150mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
150mA
150mA Load
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DROPOUT VOLTAGE (mV)
10mA Load
100A
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MIC5252
Micrel, Inc.
Dropout vs . Output C urrent
200 180 160 140 120 100 80 60 40 20 0 0
E nable T hres hold vs . S upply V oltage
1.4 1.3 ENABLE THRESHOLD (V)
E nable T hres hold vs . T emperature
1.4 1.3
V
IN
= 5V
DROPOUT (mV)
E nable On
E nable Off
ENABLE THRESHOLD (V)
1.2 1.1 1 0.9 0.8 0.7
1.2 1.1 1 0.9 0.8 0.7 0.6 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
V IN = 3.8V
2.8V OUT
20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA)
0.6 2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2 SUPPLY VOLTAGE (V)
S hort C irc uit C urrent vs . Input S upply V oltage
500 450 400 350 300 250 200 150 100 50 0 2.7
SHORT CIRCUIT CURRENT (mA)
2.8V OUT
3.2 3.7 4.2 4.7 SUPPLY VOLTAGE (V) 5.2
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MIC5252
Micrel, Inc.
Functional Characteristics
EnablePin Delay
OutputVoltage (50mV/div)
EnableVoltage (1V/div)
Load Transient Response
VOUT = 2.85V VIN = 3.6V COUT = 1F Ceramic 150mA 100A
OutputVoltage (1V/div)
OutputCurrent (100mA/div)
TIME (10 s/div)
TIME (40 s/div)
Line Transient Response
OutputVoltage (200mV/div)
5V 3.3V
InputVoltage (1V/div)
50mALoad TIME (10 s/div)
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MIC5252
Micrel, Inc.
Block Diagram
IN
Reference Voltage
Startup/ Shutdown Control
Quickstart/ Noise Cancellation
BYP
EN
Thermal Sensor
FAU LT
Error Amplifier
Current Amplifier
OU T
Undervoltage Lockout
ACTIV E SHU TDO W N
GND
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MIC5252
Micrel, Inc. 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) - T A PD (max) = J 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-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
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-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 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. 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 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.
Table 1. SOT-23-5 Thermal Resistance The actual power dissipation of the regulator circuit can be determined using the equation: 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: 125 C - 50 C PD (max) = 235 C/W 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 x 150mA - 420mW 315mW = (VIN - 2.8V) 150mA PD(max) = 315mW PD = (VIN - VOUT) IOUT + VIN IGND
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.
VIN(max) = 4.9V
735mW = VIN x 150mA
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MIC5252
Micrel, Inc.
Package Information
SOT-23-5 (M5)
6-Pin MLFTM (ML)
MICREL INC.
TEL
+ 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
2180 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
This 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) 2003 Micrel Incorporated
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