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MIC5305
150mA Cap Ultra-Low Dropout LDO Regulator
General Description
The MIC5305 is a high-performance, 150mA LDO regulator, offering extremely high PSRR and very low noise while consuming low ground current. Ideal for battery-operated applications, the MIC5305 features 1% accuracy, extremely low-dropout voltage (60mV @ 150mA), and low ground current at light load (typically 90A). Equipped with a logic-compatible enable pin, the MIC5305 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5305 is a Cap design operating with very small ceramic output capacitors for stability, thereby reducing required board space and component cost. The MIC5305 is available in fixed output voltages and adjustable output voltages in the super-compact 6-pin 2mm x 2mm MLF(R) leadless package, our new ultra-thin 6-pin 2mm x 2mm Thin MLF(R) and thin SOT-23-5 package. Additional voltage options are available. Contact Micrel marketing. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * * * * * * * * * * * * * Ultra-low dropout voltage of 60mV @ 150mA Input voltage range: 2.25 to 5.5V Stable with ceramic output capacitor 150mA guaranteed output current Low output noise -- 20Vrms Low quiescent current of 90A total High PSRR, up to 85dB @1kHz Less than 30s turn-on time w/CBYP = 0.01F High output accuracy: - 1.0% initial accuracy - 2.0% over temperature Thermal shutdown protection Current limit protection Tiny 6-pin 2mm x 2mm MLF(R) package Ultra-Thin 6-pin 2mm x 2mm Thin MLF(R) package Thin SOT-23-5 package Cellular phones PDAs Fiber optic modules Portable electronics Notebook PCs Audio Codec power supplies
Applications
Typical Application
70 DROPOUT VOLTAGE (mV) 60 50 40 30 20 10 0 0 20 40 60 80 100 120 140 OUTPUT CURRENT (mA)
Dropout Voltage
MIC5305 3.0V VIN 1F VIN VOUT EN BYP GND 0.1F 1F 2.85V@150mA VOUT
100 90 80 70 PSRR (dB) 60 50 40 30 20 10
PSRR (Bypass Pin Cap = 0.1F)
150mA
50mA 100A
0 0.1
1 10 100 FREQUENCY (kHz)
1k
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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Micrel, Inc.
MIC5305
Ordering Information
Part Number Standard
MIC5305-1.5BML MIC5305-1.8BML MIC5305-2.5BML MIC5305-2.6BML MIC5305-2.7BML MIC5305-2.8BML MIC5305-2.85BML MIC5305-2.9BML MIC5305-3.0BML MIC5305-3.3BML MIC5305-4.75BML MIC5305BML
Marking Pb-Free Standard
815 818 825 826 827 828 82J 829 830 833 84H 8AA
Pb-Free*
815 818 820 825 826 827 828 82J 829 830 833 84H 8AA 828** 846**
Voltage
1.5V 1.8V 2.0V 2.5V 2.6V 2.7V 2.8V 2.85V 2.9V 3.0V 3.3V 4.75V ADJ 2.8V 4.6V 1.5V 1.8V 2.5V 2.6V 2.7V 2.8V 2.85V 2.9V 3.0V 3.3V 4.75V
Junction Temp. Range(1)
-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 -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
6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF 6-Pin 2x2 MLF
(R) (R) (R) (R) (R) (R) (R) (R) (R) (R) (R) (R) (R) (R) (R)
MIC5305-1.5YML MIC5305-1.8YML MIC5305-2.0YML MIC5305-2.5YML MIC5305-2.6YML MIC5305-2.7YML MIC5305-2.8YML MIC5305-2.85YML MIC5305-2.9YML MIC5305-3.0YML MIC5305-3.3YML MIC5305-4.75YML MIC5305YML MIC5305-2.8YMT MIC5305-4.6YMT
6-Pin 2x2 Thin MLF 6-Pin 2x2 Thin MLF Thin SOT23-5 Thin SOT23-5 Thin SOT23-5 Thin SOT23-5 Thin SOT23-5 Thin SOT23-5 Thin SOT23-5 Thin SOT23-5 Thin SOT23-5 Thin SOT23-5 Thin SOT23-5
MIC5305-1.5BD5 MIC5305-1.8BD5 MIC5305-2.5BD5 MIC5305-2.6BD5 MIC5305-2.7BD5 MIC5305-2.8BD5 MIC5305-2.85BD5 MIC5305-2.9BD5 MIC5305-3.0BD5 MIC5305-3.3BD5 MIC5305-4.75BD5
Note:
MIC5305-1.5YD5 MIC5305-1.8YD5 MIC5305-2.5YD5 MIC5305-2.6YD5 MIC5305-2.7YD5 MIC5305-2.8YD5 MIC5305-2.85YD5 MIC5305-2.9YD5 MIC5305-3.0YD5 MIC5305-3.3YD5 MIC5305-4.75YD5
N815 N818 N825 N826 N827 N828 N82J N829 N830 N833 N84H
N815 N818 N825 N826 N827 N828 N82J N829 N830 N833 N84H
1. For other output voltage options, contact Micrel marketing. * Underbar/Overbar symbols may not be to scale. ** Pin 1 identifier for 2x2 Thin MLF is "" symbol.
(R)
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Pin Configuration
EN 1 GND 2 VIN 3 6 BYP 5 NC 4 VOUT EN 1 GND 2 VIN 3 6 BYP 5 ADJ 4 VOUT
MIC5305-x.xBML/YML (Fixed) 6-Pin 2mm x 2mm MLF(R) (ML) (Top View)
MIC5305-x.xBML/YML (Adjustable) 6-Pin 2mm x 2mm MLF(R) (ML) (Top View)
EN 1 GND 2 VIN 3
6 BYP 5 NC 4 VOUT
EN GND VIN
3 2 1
KWxx
4 5
BYP
MIC5305-x.xYMT (Fixed) (R) 6-Pin 2mm x 2mm Thin MLF (MT) (Top View)
VOUT
MIC5305-x.xBD5/YD5 (Fixed) TSOT-23-5 (D5) (Top View)
Pin Description
Pin Number MLF-6 Fixed 1 2 3 4 - 5 6 HS Pad Pin Number MLF-6 Adjustable 1 2 3 4 5 - 6 HS Pad Pin Number Thin MLF-6 Fixed 1 2 3 4 - 5 6 HS Pad - 4 - Pin Number TSOT23-5 Fixed 3 2 1 5 Pin Name Pin Name
EN GND VIN VOUT ADJ NC BYP EPAD
Enable Input. Active High. High = on, low = off. Do not leave floating. Ground. Supply Input. Output Voltage. Adjust Input: Connect to external resistor voltage divider network. No connection for fixed voltage parts. Reference Bypass: Connect external 0.1F to GND for reduced output noise. May be left open. Exposed Heatsink Pad connected to ground internally.
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MIC5305
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ............................................... 0V to 6V Enable Input Voltage (VEN)..................................... 0V to 6V Power Dissipation (PD) ........................... Internally Limited(3) Junction Temperature (TJ) ........................-40C to +125C Lead Temperature (soldering, 5sec.)......................... 260C Storage Temperature (Ts) .........................-65C to +150C EDS Rating(4) .................................................................. 2kV
Operating Ratings(2)
Supply voltage (VIN) ....................................... 2.25V to 5.5V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Junction Thermal Resistance MLF-6 (JA) ........................................................93C/W Thin MLF-6 (JA) ................................................93C/W TSOT-23-5 (JA) ..............................................235C/W
Electrical Characteristics(5)
VIN = VOUT + 1.0V; COUT = 1.0F; IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C, unless noted.
Parameter
Output Voltage Accuracy Output Voltage Temp. Coefficient Line Regulation Load Regulation Dropout Voltage
(6) (7)
Condition
Variation from nominal VOUT Variation from nominal VOUT, IOUT = 100mA to 150mA
Min
-1.0
Typ
Max
+1.0
Units
% % pm/C
-2.0
40
+2.0
VIN = VOUT +1V to 5.5V IOUT = 100A to 150mA IOUT = 50mA, VOUT > 2.8V IOUT = 150mA, VOUT > 2.8V IOUT = 50mA, VOUT > 2.8V IOUT = 150mA, VOUT > 2.8V
0.02 0.1 20 60 27 85 90 0.5 85 65
0.3 0.5 35 85 45 110 150
%/V % mV mV mV mV A A dB dB
Ground Pin Current
(8)
IOUT = 0 to 150mA VEN 0.2V f = up to 1kHz; COUT = 1.0F ceramic; CBYP = 0.1F f = 10kHz; COUT = 1.0F ceramic; CBYP = 0.1F VOUT = 0V COUT =1F, CBYP = 0.1F, 10Hz to 100kHz COUT = 1F; CBYP= 0.1F; IOUT= 150mA Logic Low (Regulator Shutdown) Logic High (Regulator Enabled)
Ground Pin Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise Turn-On Time
300
600 20 30
900 100 0.2
mA Vrms s V V A A
Enable Input
Enable Input Voltage Enable Input Current
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. 4. Devices are ESD sensitive. Handling precautions recommended. Human body model. 5. Specification for packaged product only. 6. Regulation is measured at constant junction temperature using low duty cycle pulse testing, 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 VOUT. For outputs below 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V. 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.
1.0
0.01 0.01
VIL 0.2V (Regulator Shutdown) VIH 1.0V (Regulator Enabled)
1 1
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Typical Characteristics
120 100 PSRR (dB) 80 60 40 20 0 0.1 1 10 100 FREQUENCY (kHz) 1k
PSRR (Bypass Pin Cap = 0.01F)
50mA 150mA PSRR (dB) 100A
100 90 80 70 60 50 40 30 20 10
PSRR (Bypass Pin Cap = 0.1F)
150mA
100 90 80
PSRR (Bypass Pin Cap = 1F)
150mA
50mA 100A
PSRR (dB)
70 60 50 40 30 20 10 0 0.1
100A
50mA
0 0.1
1 10 100 FREQUENCY (kHz)
1k
1 10 100 FREQUENCY (kHz)
1k
Ground Pin Current
GROUND CURRENT (A) 90 GROUND CURRENT (A) 85 80 75 70 0.1 VIN = VOUT +1V 1 10 100 1000 OUTPUT CURRENT (mA)
94 92 90 88 86 84 82 80 78 76 74 ILOAD = 100A 72 70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Ground Pin Current
94 92 90 88 86 84 82 80 78 76 74 I = 150mA 72 LOAD 70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Ground Pin Current
GROUND CURRENT (A)
GROUND CURRENT (A)
80 70 60 50 40 30 20 10 0 0 ILOAD = 150mA 1 2 3 4 5 INPUT VOLTAGE (V) 6
OUTPUT VOLTAGE (V)
100 90 80 70 60 50 40 30 20 10 0 0
Ground Pin Current
100 90
Ground Pin Current
GROUND CURRENT (A)
3.5 3 2.5 2 1.5 1 0.5 0 0
Dropout Characteristics
I LOAD = 100A
I = 150mA LOAD
ILOAD = 100A 1 2 3 4 5 INPUT VOLTAGE (V) 6
1 2 3 4 5 INPUT VOLTAGE (V)
6
2 DROPOUT VOLTAGE (mV) 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4
Dropout Voltage
DROPOUT VOLTAGE (mV)
100 90 80 70 60 50 40 30 20
Dropout Voltage
DROPOUT VOLTAGE (mV)
100 90 80 70 60 50 40 30
Dropout Voltage
I = 1mA 0.2 OUT 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE(C)
10 IOUT = 50mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
20 10 I = 100mA OUT 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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MIC5305
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
90 80 70 60 50 40 30 20 10 IOUT = 150mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
SHORT CIRCUIT CURRENT (mA)
100
Dropout Voltage
70 60 50 40 30 20 10 0 0
Dropout Voltage
800 700 600 500 400 300 200 100 0 3
Short Circuit Current
20 40 60 80 100 120 140 OUTPUT CURRENT (mA)
3.5 4 4.5 5 5.5 INPUT VOLTAGE (V)
6
2.92 2.91 2.9 VOUT (V) 2.89 2.88 2.87 2.86
ENABLE THRESHOLD VOLTAGE (V)
Output Voltage vs. Temperature
1 0.9 0.8 0.7 0.6 0.5 0.4
Enable Threshold vs. Temperature
Output Noise Spectral Density
2.85 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
ILOAD = 100A VOUT = 2.9V
I = 100A LOAD 0.3 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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MIC5305
Functional Characteristics
Line Transient Response
5V Input Voltage (1V/div)
Load Transient Response
OutputVoltage (50mV/div)
3V
OutputVoltage (1V/div)
TIME (400s/div)
Output Current (100mA/div)
CBYP = 0.01F IOUT = 100A COUT = 1F Ceramic
CBYP = 0.01F VIN = 4V COUT = 1F Ceramic
TIME (4s/div)
Enable Pin Delay
EnableVoltage (1V/div)
EnableVoltage (1V/div)
Shutdown Delay
OutputVoltage (1V/div)
CBYP = 0.01F IOUT = 100A CIN = 1F Ceramic COUT = 1F Ceramic TIME (10s/div)
OutputVoltage (1V/div)
CBYP = 0.01F IOUT = 100A VIN = 4V CIN = 1F Ceramic COUT = 1F Ceramic
TIME (20s/div)
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MIC5305
Functional Diagram
VIN EN VREF QuickStart
VOUT
Error LDO Amp
BYP Thermal Shutdown
Current Limit GND
MIC5305 Block Diagram - Fixed
VIN EN VREF QuickStart
VOUT
Error LDO Amp
BYP Thermal Shutdown
Current Limit GND
MIC5305 Block Diagram - Adjustable
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MIC5305 No-Load Stability Unlike many other voltage regulators, the MIC5305 will remain stable and in regulation with no load. This is especially import in CMOS RAM keep-alive applications. Adjustable Regulator Application Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC5305 can be adjusted from 1.25V to 5.5V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: R1 VOUT = VREF 1 + R2
VREF = 1.25V
MIC5305BML VIN 1F VIN VOUT R1 EN ADJ GND 1F R2 VOUT
Application Information
Enable/Shutdown The MIC5305 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. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Input Capacitor The MIC5305 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 MIC5305 requires an output capacitor of 1F or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. 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 0.1F 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 MIC5305 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. June 2007 9
Figure 1. Adjustable Voltage Application
Thermal Considerations The MIC5305 is designed to provide 150mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 5.0V, the output voltage is 2.9V and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT) IOUT + VIN IGND 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. PD = (5.0V - 2.9V) x 150mA PD = 0.32W 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
TJ(max) = 125C, the max. junction temperature of the die.
JA thermal resistance = 93C/W
M9999-062507
Micrel, Inc. Table 1 shows junction-to-ambient thermal resistance for the MIC5305 in the 6-pin 2mm x 2mm MLF(R) package.
Package 6-Pin 2x2 MLF
(R)
MIC5305 minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows:
JA Recommended Minimum Footprint
93C/W
JC
2C/W
0.32W =
125C - TA 93C/W
Table 1. Thermal Resistance
Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-toambient thermal resistance for the minimum footprint (the minimum amount of copper that you can solder the part to) is 93C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5305-2.9BML at an input voltage of 5.0V and 150mA load with a
TA = 95.2C Therefore, a 2.9V application at 150mA of output current can accept an ambient operating temperature of 95.2C in a 6-pin 2mm x 2mm MLF(R) 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. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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MIC5305
Package Information
6-Pin 2x2 MLF (ML)
(R)
6-Pin 2x2 Thin MLF (MT)
(R)
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MIC5305
5-Pin TSOT-23 (D5)
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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