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MIC5265
150mA Cap LDO Regulator
General Description
The MIC5265 is a 150mA LDO in lead-free Thin SOT-23-5 packaging ideal for applications where cost is the priority. The MIC5265 is ideal for any application in portable electronics, including both RF and Digital applications. With low output noise and high PSRR, the MIC5265 is ideal for noise sensitive applications such as RF. While the fast transient response and active shutdown circuitry makes it well-suited for powering digital circuitry. The MIC5265 has a 2.7V to 5.5V input operating voltage range, making it ideal for operation from a single cell lithium ion battery or fixed 3.3V and 5V systems. The MIC5265 come with an enable pin and can be put into a zero off-mode current state. The MIC5265 offers low dropout voltage (210mV at 150mA), low output noise (57Vrms), high PSRR and integrates an active shutdown circuit on the output of each regulator to discharge the output voltage when disabled. Data sheets and supporting documentation can be found on Micrel's web site at: www.micrel.com
Features
* * * * * * * * * 2.7V to 5.5V supply voltage. Low 75A quiescent current per LDO. Thin SOT-23-5 package. Low Noise - 57Vrms. High PSRR - 60dB at 1kHz. Low dropout voltage - 210mV at 150mA. Stable with ceramic output capacitors. Fast transient response. Active shutdown.
Applications
* Cellular Telephones * PDAs * GPS Receivers
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Typical Application
Power Supply Rejection Ratio
50mA
MIC5265-xxYD5 VIN EN 1F BYP 0.01F GND 1F RF Receiver VOUT Rx/Synth
-70 -60 -50 -40 -30 -20
100mA 150mA
0 0.01 0.1 1 10 100 FREQUENCY (kHz)
VIN = VOUT + 1V VOUT = 3.1V BYP = 0.01F COUT = 1F
1000
RF Power Supply
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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MIC5265
Ordering Information
Part Number Output Voltage Marking Code Junction Temp. Range Package
MIC5265-1.5YD5 MIC5265-1.8YD5 MIC5265-1.85YD5 MIC5265-2.5YD5 MIC5265-2.6YD5 MIC5265-2.7YD5 MIC5265-2.8YD5 MIC5265-2.85YD5 MIC5265-2.9YD5 MIC5265-3.0YD5 MIC5265-3.1YD5 MIC5265-3.2YD5 MIC5265-3.3YD5
1.5V 1.8V 1.85V 2.5V 2.6V 2.7V 2.8V 2.85V 2.9V 3.0V 3.1V 3.2V 3.3V
N715 N718 N71J N725 N726 N727 N728 N72J N729 N730 N731 N732 N733
-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
Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5 Pb-Free Thin SOT-23-5
Note: 1. Other Voltage Combinations available. Contact Micrel, Inc. for details.
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Pin Configuration
EN GND VIN 1 3 2
4 BYP
5 OUT
Lead-Free Thin SOT-23-5 (M5)
Pin Description
Pin Number 1 2 3 4 5 Pin Name IN GND EN BYP OUT Pin Function Supply Voltage 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
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN).................................... 0V to +7V Enable Input Voltage (VEN1) ................................. 0V to +7V Power Dissipation (PD) .......................... Internally Limited (3) Junction Temperature (TJ) ...........................-40C to 125C Lead Temperature (soldering, #sec.)......................... 260C Storage Temperature (Ts) ............................-55C to 150C EDS Rating (4) ................................................................. 2kV
Operating Ratings(2)
Supply Input Voltage (VIN)............................ +2.7V to +5.5V Enable Input Voltage (VEN)................................... 0V to +VIN Junction Temperature (TA) ........................ -40C to +125C Junction Thermal Resistance Thin SOT-23-5 (JA).........................................235C/W
Electrical Characteristics(5)
VEN = VIN = VOUT + 1V; IL =100A; CL = 1.0F; CBYP = 0.01F per output; TA = 25C, bold values indicate -40C< TA < +85C; unless noted.
Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage Quiescent Current Ground Pin Current PSRR (Ripple Rejection) Current Limit Output Noise Enable Input (EN1 and EN2) Enable Input Logic Low Enable Input Logic High Enable Input Current Thermal Shutdown Thermal Shutdown Temperature Hysteresis Turn-on/Turn-off Characteristics Turn-on Time Discharge Resistance Condition IOUT = 100A VIN = VOUT +1V to 5.5V IOUT = 0.1mA to 150mA IOUT = 50mA IOUT = 150mA VEN < 0.2V IOUT = 0mA IOUT = 150mA f = 100Hz, CBYP = 0.1F, ILOAD - 50mA f = 1kHz, CBYP = 0.1F, ILOAD - 50mA f = 10kHz, CBYP = 0.1F, ILOAD - 50mA VOUT = 0V COUT = 1.0F, CBYP = 0.1F, 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 Min -2 -3 0.05 2 75 210 0.2 75 80 62 64 64 225 57 Typ Max 2 3 0.2 3 500 2 120 150 Units % % % % mV mV A
A A
dB dB dB mA
V
(rms) V V
0.2
1.6 0.01 0.01 150 10 40 500 150
A A C C s
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 MIC5265x.xYD5 (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.
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Typical Characteristics
-70 -60 -50 -40 -30 -20 VIN = VOUT + 1V VOUT = 3.1V BYP = 0.01F COUT = 1F 100mA 150mA
Power Supply Rejection Ratio
50mA
-80 -70 -60 -50 -40 -30
Power Supply Rejection Ratio
50mA
-70 -60 -50
Power Supply Rejection Ratio
50mA 100mA 150mA
100mA 150mA
-40 -30
0 0.01 0.1 1 10 100 FREQUENCY (kHz)
1000
-20 VIN = VOUT + 1V VOUT = 3.1V -10 BYP = 0.1F COUT = 1F 0 0.01 0.1 1 10 100 FREQUENCY (kHz)
1000
VIN = VOUT + 1V VOUT = 3.1V -10 BYP = 1F COUT = 1F 0 10 100 1000 10000 0.01 0.1 1 10 100000 100 FREQUENCY (kHz)
-20
1000000
1000
0.30 0.25 0.20 0.15 0.10 0.05 0.00 0
Dropout Voltage vs. Output Current
125C
0.30 0.25
Dropout Voltage vs. Temperature
3.30 3.25
Dropout Voltage vs. Temperature
25C
0.20 0.15
150mA 100mA 50mA 10mA 1mA
3.20 3.15 3.10 3.05 3.00 2.95 2.90 -40 -15 Iload = 100A VOUT = 3.1V VIN = VOUT + 1 10 35 60 85 110 TEMPERATURE (C)
-40C
0.10 0.05
25 50 75 100 125 150 OUTPUT CURRENT (mA)
0.00 -40 -15 10 35 60 85 110 TEMPERATURE (C)
Output Voltage vs. Input Voltage
3 2.5 2 1.5 1 0.5 0 0 1 2 3 4 INPUT VOLTAGE(V) 5 100A Load 150A Load
3.0 2.9 2.8 2.7 2.6 2.5
Output Voltage vs. Temperature
83 82 81 80 79 78 77 76 75 74 73 72 0
Ground Pin Current vs. Output Current
VIN = 3.8V VOUT = 2.8V COUT = 1F IOUT = 100A TEMPERATURE (C)
VIN = VOUT + 1V VOUT = 3.1V 30 60 90 120 150 OUTPUT CURRENT (mA)
Ground Pin Current vs. Temperature
78 76 74 72 70 68 -40 Iload = 100A -10 20 50 80 110 TEMPERATURE (C)
95 90 85 80 75 70 65 60 -40
Ground Pin Current vs. Temperature
90 80 70 60 50 40 30 20 10 0 0
Ground Pin Current vs. Input Voltage
Iload = 150mA -10 20 50 80 110 TEMPERATURE (C)
Iload = 100A VOUT = 3.1V VIN = VOUT + 1 1 2 3 4 INPUT VOLTAGE (V) 5
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Typical Characteristics (continued)
90 80 70 60 50 40 30 20 10 0 0 Iload = 150A VOUT = 3.1V VIN = VOUT + 1 1 2 3 4 INPUT VOLTAGE (V) 5
Ground Pin Current vs. Input Voltage
290 270 250 230 210 190 170 150 3
Short Circuit Current vs. Input Voltage
10
Output Noise Spectral Density
1
0.1 VIN = 4.2V 0.01 VOUT = 2.8V COUT = 1.0F BYP = 0.1F IOUT = 150mA 0.001 10 100 0.01 0.1 1000 1 10000 100000 1000 10000000 10 100 1000000 10000 FREQUENCY (kHz)
3.5 4 4.5 5 INPUT VOLTAGE (V)
5.5
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Functional Characteristics
Line Transient Response
Output Voltage (50mV/div)
Input Voltage (1V/div)
Load Transient Response
5.0V 4.0V
Output Voltage (20mV/div)
Output Current (50mA/div)
COUT = 1F Ceramic CBYP = 0.01F IOUT = 150mA VOUT = 3.1V VIN = V OUT + 1V
150mA
100A
COUT = 1F Ceramic CBYP = 0.01F VOUT = 3.1V VIN = V OUT + 1V
Time (400s/div)
Time (5s/div)
Enable Pin Delay
Output Voltage (1V/div)
Shutdown Delay
Enable Voltage (1V/div)
Output Voltage (1V/div)
CIN = 1F Ceramic CBYP = 0.01F IOUT = 10mA VOUT = 3.1V VIN = VOUT + 1V
Time (10s/div)
Enable Voltage (1V/div)
CIN = 1F Ceramic COUT = 1F Ceramic IOUT = 10mA VOUT = 3.1V VIN = V OUT + 1V
Time (100s/div)
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Block Diagram
IN Reference Voltage EN Startup/ Shutdown Control Quickstart/ Noise Cancellation BYP
Thermal Sensor
FAULT
Error Amplifier
Current Amplifier
OUT
Undervoltage Lockout
ACTIVE SHUTDOWN
GND
MIC5265 Diagram
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MIC5265 large capacitor on the bypass pin without significantly slowing turn-on time.
Applications Information
Enable/Shutdown The MIC5265 comes with an active-high enable pin that allows the regulator in each output 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 MIC5265 is a high performance, high bandwidth device. Therefore, it requires well-bypassed input supplies 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 highfrequency 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 MIC5265 requires an output capacitor for stability. The design requires 1F or greater on each 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 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 MIC5265 to drive a
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Active Shutdown The MIC5265 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 MIC5265 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 MIC5265 is designed to provide 150mA of continuous current per output 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 2.8V, and the output current is 100mA. 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 - 2.8V) x 150mA PD = 0.33W 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:
T J (max) - T A PD(max) = JA
TJ(max) = 125C, the max. junction temperature of the die JA thermal resistance = 235C/W
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MIC5265
MIC5265 Junction-To-Ambient Thermal Resistance
Package SOT-23-5 (M5 or D5) JA Recommended Minimum Footprint 235C/W JA 1" Sq. Copper Clad 125C JC 145C/W
0.33W =
125C - T A 235C / W
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 is 235 C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5265-2.8YD5 at an input voltage of 5.0V at 150mA with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows:
TA = 47.45C Therefore, a 2.8V application at 150mA of output current can accept an ambient operating temperature of 47C 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. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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Package Information
Thin SOT-23-5 (M5)
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) 2005 Micrel, Incorporated.
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