MIC5311 LowQ™ Mode Dual 300mA LDO General Description Features The MIC5311 is a high performance, dual µCap low dropout regulator offering ultra-low operating current and a second, even lower operating current mode, LowQ™ mode, reducing operating current by 75%. Each regulator can source up to 300mA of output current maximum. Ideal for battery operated applications, the MIC5311 offers 1% accuracy, extremely low dropout voltage (60mV @ 150mA), and low ground current (typically 28µA total). When put into LowQ™ mode, the internal current draw drops down to 7µA total. The MIC5311 also comes equipped with a TTL logic compatible enable pin that allows the part to be put into a zero-offmode current state, drawing no current when disabled. The MIC5311 is a µCap design, operating with very small ceramic output capacitors for stability, reducing required board space and component cost. The MIC5311 is available in fixed output voltages in the 3mm x 3mm MLF-10 leadless package. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • Input voltage range: 2.5V to 5.5V • LowQ™ Mode - 7µA total quiescent current - 10mA output current capable LowQ™ mode - Logic level control with external pin • Stable with ceramic output capacitor • 2 LDO Outputs – 300mA each • Tiny 3mm x 3mm MLF™-10 package • Low dropout voltage of 60mV @ 150mA • Ultra-low quiescent current of 28µA total in Full Current Mode • High output accuracy - ±1.0% initial accuracy - ±2.0% over temperature • Thermal Shutdown Protection • Current Limit Protection Applications • • • • Cellular/PCS phones Wireless modems PDAs MP3 Players Typical Application VIN VOUT1 VCORE EN1 VOUT2 VI/O EN2 Baseband µProcessor LOWQ BYP GND MIC5311-xxBML MLF and MicroLeadFrame are 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 February 2005 M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 Ordering Information Part Number MIC5311-GMBML MIC5311-DKBML Output Voltage* Junction Temp. Range Package 1.8V/2.8V 1.85V/2.6V –40°C to +125°C –40°C to +125°C 10-Pin 3×3 MLF™ 10-Pin 3×3 MLF™ Note: *Other Voltage options available between 1.25V and 5V. Contact Micrel for details. Pin Configuration VIN 1 10 VOUT1 EN1 2 9 VOUT2 EN2 3 8 NC LOWQ 4 7 NC 6 GND BYP 5 MIC5311-xxBML (3x3) Pin Description Fixed 1 2 Pin Name VIN EN1 3 EN2 4 LowQ™ 5 BYP 6 7 8 9 10 EP GND NC NC VOUT2 VOUT1 GND February 2005 Pin Function Supply Input. (VIN1 and VIN2 are internally tied together) Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating LowQ™ Mode. Active Low Input. Logic High = Full Power Mode; Logic Low = Light Load Mode; Do not leave floating. Reference Bypass: Connect external 0.01µF to GND to reduce output noise. May be left open. Ground. Output of regulator 2 Output of regulator 1 Ground. Internally connected to the Exposed Pad. 2 M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Input Voltage (VIN) .............................. 0V to 6V Enable Input Voltage (VEN)............................. 0V to 6V LowQ™ Input Voltage (VLowQ™)...................... 0V to 6V Power Dissipation (PD) ..................Internally Limited (3) Junction Temperature ....................... -40°C to +125°C Lead Temperature (soldering, 5sec.) .................260°C Storage Temperature (Ts) ................. -65°C to +150°C Supply Input Voltage (VIN)..........................2.5V to 5.5V Enable Input Voltage (EN1/EN2/LowQ™) ...... 0V to VIN Junction Temperature (TJ) .................. -40°C to +125°C Package Thermal Resistance MLF-10 (θJA) ................................................. 63°C/W Electrical Characteristics (Full Power Mode) VIN = VOUT + 1.0V for higher output of the regulator pair; LowQ™ = VIN; COUT = 2.2µF, IOUT = 100µA; TJ = 25°C, bold values indicate -40°C to +125, unless noted. Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage Ground Pin Current Ground Pin Current in Shutdown Ripple Rejection Conditions Variation from nominal VOUT Variation from nominal VOUT; -40°C to +125°C VIN = VOUT +1V to 5.5V Typ 0.02 Max +1.0 +2.0 0.3 0.6 1.0 1.5 Units % % %/V IOUT = 100µA to 150mA IOUT = 100µA to 300mA IOUT = 150mA IOUT = 300mA IOUT1 = IOUT2 = 100µA to 300mA 0.35 0.7 VEN < 0.2V 0.1 mV mV µA µA µA 65 35 450 45 dB dB mA µVrms 60 120 28 f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 10nF f = 1kHz – 20kHz; COUT = 2.2µF ceramic; CBYP = 10nF Current Limit VOUT = 0V (Both Regulators) Output Voltage Noise COUT = 2.2µF, CBYP = 0.01µF, 10Hz to 100kHz Enable and LowQ™ Input (EN1/EN2/LowQ™) Enable Input Voltage Logic Low Logic High Enable Input Current VIL < 0.2V VIH > 1.0V Turn-on Time COUT = 2.2µF; CBYP = 0.01µF Light Load Response Response Time (4) Into Light Load Out of Light Load February 2005 Min -1.0 -2.0 3 350 240 45 50 700 0.2 1.0 0.1 0.1 300 50 50 1 1 500 % % V V µA µA µs µs µs M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 Electrical Characteristics (LowQ™ Mode) VIN = VOUT + 1.0V for higher output of the regulator pair; LowQ™ = 0V; COUT = 2.2µF, IOUT = 100µA; TJ = 25°C, bold values indicate -40°C to +125°C, unless noted. Parameter Output Voltage Accuracy Conditions Variation from nominal VOUT Line Regulation Typ Max +2.0 +3.0 Units % % VIN = VOUT +1V to 5.5V 0.02 %/V Load Regulation IOUT = 100µA to 10mA 0.1 0.3 0.6 0.5 % Dropout Voltage IOUT = 10mA 100 200 mV Ground Pin Current Both outputs enabled 7 Ground Pin Current in Shutdown Ripple Rejection VEN < 0.2V 10 12 1.0 µA µA µA 150 dB dB mA Current Limit Min -2.0 -3.0 0.01 f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 10nF f = 1kHz – 20kHz; COUT = 2.2µF ceramic; CBYP = 10nF VOUT = 0V (Both regulators) 40 45 30 75 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 / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 4. Response time defined as the minimum hold-off time after the LowQ™ command before applying load transients. February 2005 4 M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 Typical Characteristics Ripple Rejection LowQ Mode 2.7 80 2.65 70 70 60 60 50 50mA 40 150mA 30 VOUT=1.85V +1V V =V 20 IN OUT = 2.2µF C 10 OUT C = 10nF 300mA BYP 0 10 1k 100 10k 100k 1M FREQUENCY (Hz) 50 40 . 30 VOUT=1.85V VIN=VOUT+1V 20 =10mA I LOAD 10 C = 2.2 µF Ceramic 0 10 1.5 1 0.5 VOUT=2.6V 1 2 3 4 5 SUPPLY VOLTAGE (V) 2.4 2.35 2.3 0 120 100 80 150mA 60 40 50mA 20 0 -40 -20 0 Ground Current vs. Supply Voltage 150mA 100mA 20 15 10 10mA LowQ™ 5 0 1.3 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 SUPPLY VOLTAGE (V) GROUND CURRENT (µA) 25 100 125 30 25 80 6mA 60 3mA 40 20 0 -40 -20 0 20 40 60 80 100 120 Ground Current vs. Temperature (LowQ Mode) 9 50mA 150mA 300mA 100mA 20 15 10 5 0 -40 -20 0 10mA 100 35 300mA 30 75 120 20 40 60 80 100 120 Ground Current vs. Temperature 35 50 140 300mA 140 6 100µA 25 Dropout vs. Temperature (LowQ Mode) 20 40 60 80 100 120 GROUND CURRENT (µA) 0 0 2.5 2.45 1k 100 10k 100k 1M FREQUENCY (Hz) DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 150mA 300mA 2 2.55 OUT 160 100mA 2.5 2.6 Dropout vs. Temperature (Normal Mode) 3 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 90 80 Dropout Characteristics GROUND CURRENT (µA) Output Voltage vs. Temperature 90 PSRR (dB) PSRR (dB) Ripple Rejection vs. I LOAD (Normal Mode) 8 7 10mA 100µA 6 5 4 3 2 1 0 -40 -20 0 20 40 60 80 100 120 Output Noise Spectral Density NOISE (µV/rootHz) 1 0.1 0.01 VIN = 4.45V COUT = 2.2 µF CBYP = 0.01µF VOUT = 1.8V R 0.001 OUT 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) February 2005 5 M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 Functional Characteristics Enable Off - Normal VEN (500mV/div) VEN (500mV/div) Enable On- Normal ILOAD = 200mA VOUT = 2.6V VOUT (1V/div) VOUT (1V/div) ILOAD = 200mA VOUT = 2.6V Time (40µs/div) Time (10µs/div) Line Transient - Normal VIN (1V/div) VIN (1V/div) Line Transient - LowQ 5.5V 5.5V 4V VOUT (20mV/div) 4V VOUT (50mV/div) VOUT = 2.6V VIN = VOUT + 1V COUT = 2.2µF LowQ = 0V ILOAD = 10mA ILOAD = 300mA VOUT = 2.6V COUT = 2.2µF LowQ = 5.5V Time (40µs/div) Time (200µs/div) IOUT (100mA/div) Load Transient - Normal 10mA VOUT (20mV/div) 100µA VOUT = 2.6V VIN = VOUT + 1V COUT = 2.2µF Time (200µs/div) February 2005 300mA 0mA VOUT (10mV/div) IOUT (10mV/div) Load Transient - LowQ VOUT = 2.6V VIN = VOUT + 1V COUT = 2.2µF Time (1ms/div) 6 M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 Functional Characteristics (cont.) LowQTM (1V/div) LowQ ILOAD = 10mA Time (40µs/div) February 2005 TM LowQ Normal VOUT1 VOUT2 (500mV/div) (500mV/div) Normal LowQ to Normal Transien t TM VOUT2 VOUT1 (500mV/div) (500mV/div) LowQTM (1V/div) Normal to LowQ Transien t ILOAD = 10mA Time (40µs/div) 7 M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 Functional Diagram VIN VOUT1 LDO1 EN1 LOWQ LowQ™ VOUT2 LDO2 EN2 BYP Reference GND MIC5311 Block Diagram February 2005 8 M9999-021105 (408) 955-1690 Micrel, Inc. Functional Description The MIC5311 is a high performance, low quiescent current power management IC consisting of two µCap low dropout regulators with a LowQ™ mode featuring lower operating current. Both regulators are capable of sourcing 300mA. Enable 1 and 2 The enable inputs allow for logic control of both output voltages with individual enable inputs. The enable input is active high, requiring 1.0V for guaranteed operation. The enable input is CMOS logic and cannot be left floating. LowQ™ Mode The LowQ™ pin is logic level low, requiring <0.2V to enter the LowQ™ mode. The LowQ™ pin cannot be left floating. Features of the LowQ™ mode include lower total quiescent current of typically 7uA. Input Capacitor Good bypassing is recommended from input to ground to help improve AC performance. A 1µF capacitor or greater located close to the IC is recommended. Larger load currents may require larger capacitor values. Bypass Capacitor The internal reference voltage of the MIC5311 can be bypassed with a capacitor to ground to reduce output noise and increase input ripple rejection (PSRR). A quick-start feature allows for quick turn-on of the output voltage. The recommended nominal bypass capacitor is 0.01µF, but an increase will result in longer turn on times ton. Output Capacitor Each regulator output requires a 2.2µF ceramic output capacitor for stability. The output capacitor value can be increased to improve transient response, but performance has been optimized for a 2.2µF ceramic type output capacitor. 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% to 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. MIC5311 Thermal Considerations The MIC5311 is designed to provide 300mA of continuous current per channel in a very small MLF 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: PD (max) = (TJ (max) - TA) /θJA TJ (max) is the maximum junction temperature of the die, 125°C, and TA is the ambient operating temperature. θJA is layout dependent; Table 1 shows examples of the junction-to-ambient thermal resistance for the MIC5311. Package 3x3 MLF™-10 θJA Recommended Minimum Footprint 63°C/W θJC 2°C/W Table 1. MLF™ Thermal Resistance The actual power dissipation of the regulator circuit can be determined using the equation: PDTOTAL = PD LDO1 + PD LDO2 PD LDO1 = (VIN-VOUT1) x IOUT1 PD LDO2 = (VIN-VOUT2) x IOUT2 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 MIC5311 at 60°C with a minimum footprint layout, the maximum load currents can be calculated as follows: PD (max) = (TJ (max) - TA) /θJA PD (max) = (125°C - 60°C) / 63°C/W PD (max) = 1.03W The junction-to-ambient thermal resistance for the minimum footprint is 63°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using a lithium-ion battery as the supply voltage of 4.2V, 1.8VOUT/150mA for channel 1 and 2.8VOUT/100mA for channel 2, power dissipation can be calculated as follows: PD LDO1 = (VIN-VOUT1) x IOUT1 PD LDO1 = (4.2V-1.8V) x 150mA PD LDO1 = 360mW PD LDO2 = (VIN-VOUT2) x IOUT2 PD LDO1 = (4.2V-2.8V) x 100mA PD LDO1 = 140mW February 2005 9 M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 TA(max) = TJ(max) – (PD x θJA) TA(max) = 125°C – (500mW x 63°C/W) TA(max) = 93.5°C PDTOTAL = PD LDO1 + PD LDO2 PDTOTAL = 360mW + 140mW PDTOTAL = 500mW The calculation shows that we are well below the maximum allowable power dissipation of 1.03W for a 60° ambient temperature. After the maximum power dissipation has been calculated, it is always a good idea to calculate the maximum ambient temperature for a 125° junction temperature. Calculating maximum ambient temperature as follows: February 2005 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 10 M9999-021105 (408) 955-1690 Micrel, Inc. MIC5311 Package Information 10-Pin 3x3 MLF (MLF) 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. © 2004 Micrel, Incorporated. February 2005 11 M9999-021105 (408) 955-1690