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MIC5295
Low Quiescent Current, 150mA LDO Regulator
General Description
The MIC5295 is a 150mA highly accurate, low dropout regulator with high input voltage and low ground current. This combination of high voltage and low ground current makes the MIC5295 ideal for USB and portable electronics applications, using 1-cell, 2-cell or 3-cell Li-Ion battery inputs. A Cap LDO design, the MIC5295 is stable with either a ceramic or tantalum output capacitor. It only requires a 2.2F capacitor for stability. Features of the MIC5295 includes enable input, thermal shutdown, current limit, reverse battery protection, and reverse leakage protection. Available in fixed and adjustable output voltage versions, the MIC5295 is offered in the TO-252-5 (D-Pak) package with a junction temperature range of -40C to +125C.
Features
* * * * * * * * * * * Wide input voltage range: 2.3V to 24V Ultra low ground current: 18A Low dropout voltage: 300mV at 150mA High initial output accuracy: 1.0% Stable with ceramic or tantalum capacitors Excellent line and load regulation specifications Reverse battery protection Reverse leakage protection Thermal shutdown and current limit protection PowerTO-252-5 (D-Pak)package Adjustable output from 1.24V-20V
Applications
* * * * * * USB power supply Cellular phones Keep-alive supply in notebook and portable computers Logic supply for high-voltage batteries Automotive electronics Battery powered systems
Typical Application
Ground Current v s. Input Voltage
100 90 GROUND CURRENT (A) 80 70 60 50 40 30 20 10 0 4 8 12 16 20 INPUT VOLT AGE (V) 24
100A 10mA
Low Current Adjustable Regulator Application
Ground Current vs. Input Voltage
IttyBitty is a registered trademark of Micrel, 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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Micrel, Inc.
MIC5295
Ordering Information
Part Number MIC5295-3.0YD MIC5295-3.3YD MIC5295-5.0YD MIC5295YD Marking Code 5295-30Y 5295-33Y 5295-50Y 5295YD Voltage 3.0V 3.3V 5.0V Adj Junction Temp. Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C Package 5-Pin TO-252 5-Pin TO-252 5-Pin TO-252 5-Pin TO-252
Pin Configuration
5-Pin TO-252
Pin Description
Pin Number 1 2 3 4 5 Pin Name EN VIN GND VOUT NC(fixed) ADJ(adj) Pin Function Enable (Input): Logic low = shutdown; logic high = enable. Do not leave floating. Supply Input. Ground. Regulator Output. No Connect. Adjust (Input): Feedback input. Connect to resistive Voltage-divider network.
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Absolute Maximum Ratings(1)
Input Supply Voltage ........................................ -20V to 38V Enable Input Voltage....................................... -0.3V to 38V Power Dissipation .....................................Internally Limited Junction Temperature ...............................-40C to +125C Storage Temperature ................................-65C to +150C ESD Rating(3) ................................................. ESD Sensitive
Operating Ratings(2)
Input Supply Voltage ......................................... 2.3V to 24V Enable Input Voltage............................................ 0V to 24V Junction Thermal....................................... -40C to +125C Package Thermal Resistance TO-252-5 (JA) ...................................................50C/W
Electrical Characteristics(4)
VIN = VOUT + 1V; IOUT = 100A; CIN =1.0F, COUT = 2.2A; TJ = 25C, bold values indicate -40CParameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage Condition Variation from nominal VOUT VIN = VOUT + 1V to 24V Load = 100A to 150mA IOUT = 100A IOUT = 50mA IOUT = 100mA IOUT = 150mA Reference Voltage -1.0 Ground Current IOUT = 100A IOUT = 50mA IOUT = 100mA IOUT = 150mA Ground Current in Shutdown Current Limit Ripple Rejection Output Voltage Noise Output Leakage, Reverse Polarity Input Enable Input Enable turn on time Input Low Voltage Input High Voltage Enable Input Current Regulator OFF Regulator ON VEN = 0.6V; Regulator OFF VEN = 2.0V; Regulator ON VEN = 24V; Regulator ON 2.0 -1.0 0.01 0.1 0.5 1.0 1.0 2.5 1.2 10 0.4 ms V V A A A VEN = 0V; VIN = 24V VOUT = 0V f =1kHz 10Hz to 100kHz Load = 500; VIN = -15V; VEN =0.4V 18 0.35 1 2 0.1 350 50 47 -0.1 Min -1.0 -2.0 0.04 0.25 45 220 260 300 1.24 +1.0 30 35 0.7 2 4 1 500 400 450 500 1 Typ Max +1.0 +2.0 Units % % % % mV mV mV mV V % A A mA mA mA A mA dB VRMS A
Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Specification for packaged product only.
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Typical Characteristics
PSRR
-100 -90 -80 -70 -60 dB -50 -40 -30 -20 -10 0 10 100 1K 10K 100K 1M 10M 1.E+0 1.E+0 1.E+0 1.E+0 1.E+0 1.E+0 1.E+0 1 2 3 4 5 6 7 FREQ UENCY (Hz)
100A 150mA
Dropout Voltage v s. Output Current
350 DRO POUT VOLTAG E (mV)
VIN = 10V VOUT = 2.5V COUT = 2.2F
Dropout Voltage v s. Temperature
450 400 DROPOUT VO LTAGE (mV) 350 300 250 200 150 100 50 0 -40 -20
VOUT = 2.5V COUT = 2.2F 100mA 50mA 150mA
300 250 200 150 100 50 0 0 25 50 75 100 125 OUT PUT CURRENT (mA) 150
VOUT = 2.5V COUT = 2.2F
0 20 40 60 80 T EM PERAT URE (C)
100 120
Ground Current v s. Input Voltage
2.5
150mA
Ground Current v s. Input Voltage
90 80 G RO UND CURRENT (A) 70 60 50 40 30 20 10 0 2.3 2.8
VOUT = 1.36V COUT = 2.2F 100A 10mA
Ground Current v s. Input Voltage
2.5 2.0 1.5
100mA VOUT = 3V COUT = 2.2F 150mA
GROUND CURRENT (mA)
1.5 1.0
VOUT = 1.36V COUT = 2.2F
100mA
GROUND CURRENT (mA)
2.0
1.0
50mA
50mA
0.5 0.0 2.3 2.8 3.3 3.8 4.3 4.8 5.3 INPUT VOLT AGE (V) 5.8
0.5 0.0
3.3 3.8 4.3 4.8 5.3 INPUT VO LT AGE (V)
5.8
4
8
12 16 20 INPUT VOLT AGE (V)
24
Ground Current v s. Input Voltage
100 90 GROUND CURRENT (A) 80 70 60 50 40 30 20 10 0 4 8 12 16 20 INPUT VOLT AGE (V) 24
100A 10mA VOUT = 3V COUT = 2.2F
Ground Current v s. Output Current
2.50 2.25 GROUND CURRENT (mA) 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 0 25 50 75 100 125 OUT PUT CURRENT (mA) 150
VIN = 24V VIN = 4V VOUT = 3V COUT = 2.2F
Ground Current v s. Temperature
3.0
150mA
GROUND CURRENT (mA)
VIN = 12V
2.5 2.0 1.5 1.0 0.5 0.0 -40 -20 0 20 40 60 80 T EM PERAT URE (C) 100 120
50mA VOUT = 3V COUT = 2.2F 100mA
Output Voltage v s. Input Voltage
3.2
COUT = 2.2F
Current limit v s. Input Voltage
500 450
10
MIC5295 - Output Noise Spectral Density
O UTPUT VOLTAG E (V)
NOISE V/Hz
100A
CURRENT LIM IT (mA)
3.1
1
400 350 300 250 200
3.0
0.1
2.9
75mA 150mA
0.01
VIN = 4.5V VOUT = 3V COUT = 2.2F
2.8 0 5 10 15 20 INPUT VO LT AG E (V) 25
0
5
10 15 20 25 30 INPUT VO LT AGE (V)
35
40
0.001 10 100 1K 10K 100K 1M 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 FREQUENCY (Hz)
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Typical Characteristics (continued)
Rev erse Current (Open Input)
70 60 REVERSE CURRENT (A) 50 40 30 20 10 0 0 5 10 15 EXT ERNAL VOLT AGE (V) 20
25C
Rev erse Current (VIN Grounded)
60 50 40 30 20 10 0 0 5 10 15 EXT ERNAL VOLT AGE (V) 20
25C 125C -40C
125C -40C
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REVERSE CURRENT (A)
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MIC5295
Functional Characteristics
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Functional Diagram
Block Diagram - Fixed Output Voltage
Block Diagram - Adjustable Output Voltage
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MIC5295 part. For example, given that the input voltage of 3.3V the output voltage is 2.3V and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT)IOUT + VIN x IGND Due to the potential for input voltages up to 24V, ground current must be taken into consideration. PD(MAX) = (3.3 - 2.3V)150mA + 3.3x 1.2mA PD(MAX) = 0.154W The junction-to-ambient thermal resistance for the MIC5295, D-Pak is 50C/W.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
Application Information
Enable/Shutdown The MIC5295 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. Do not leave this pin floating as the output will be in indeterminate state. Input Capacitor The MIC5295 has high input voltage capability up to 24V. The input capacitor must be rated to sustain voltages that may be used on the input. An input capacitor may be required when the device is not near the source power supply or when supplied by a battery. Small, surface mount, ceramic capacitors can be used for bypassing. Larger values may be required if the source supply has high ripple. Output Capacitor The MIC5295 requires an output capacitor for stability. The design requires 2.2F 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 3. The output capacitor can be increased without limit. Larger valued capacitors help to improve transient response. 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 a X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. No-Load Stability The MIC5295 will remain stable with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC5295 is designed to provide 150mA of continuous current in a small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the
TJ(MAX) is the maximum junction temperature of the die, 125C, the maximum ambient temperature can be calculated to be 117.3C as shown below:
125C - TA 0.154W = 50C/W
TA = 117.3C Adjustable Regulator Application The MIC5295YD can be adjusted from 1.24V to 20V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation:
R VOUT = VREF 1 + 1 R 2
Where VREF = 1.24V. Feedback resistor R2 should be no larger than 300k.
Figure 1. Adjustable Voltage Application
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Evaluation Board Schematic
Bill of Materials
Item C1 C2 R1 R2 U1
Notes: 1. Murata: www.t-yuden.com 2. Vishay: www.vishay.com. 3. Micrel, Inc.: www.micrel.com.
Part Number UMK325BJ105KM-T TMK212BJ225KG-T CRCW06033003FKEYE3 CRCW06031003FKEYE2 MIC5295YD
Manufacturer Taiyo Yuden(1) Taiyo Yuden Vishay Dale Micrel, Inc.
(2)
Description Capacitor, 1F, 50V, X5R, Size 1210 Capacitor, 2.2F, 25V, X5R, Size 0805 Resistor, 300k, 1%. 1/16W, Size 0603 Resistor, 100k, 1%. 1/16W, Size 0603 Low Quiescent Current, 150mA LDO Regulator
Qty. 1 1 1 1 1
Vishay Dale
(3)
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PCB Layout Recommendations
Top Layer
Bottom Layer
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Package Information
5-Pin TO-252
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) 2009 Micrel, Incorporated.
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