MIC5308 Low VIN/VOUT 150mA High PSRR ULDO™ with Ultra-Low IQ General Description Features The MIC5308 is a high performance, µCap low dropout regulator, offering ultra-low operating current while maintaining very fast transient response. The MIC5308 can source up to 150mA of output current and can regulate down from a low input supply voltage to increase system efficiency. Ideal for battery operated applications; the MIC5308 offers extremely low dropout voltage 45mV typically @ 150mA, and low ground current at all load conditions (typically 23µA). The MIC5308 can also be put into a zero-off-mode current state, drawing virtually no current when disabled. The MIC5308 is available in fixed output voltages in the tiny 6-pin 1.6mm x 1.6mm thin MLF® leadless package as well as the 6-pin TSOT-23 for cost sensitive applications. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • • • • • • • • Input voltage range: 1.6V to 5.5V Guaranteed 150mA over temperature Ultra Low dropout voltage of 45mV at 150mA High PSRR, up to 90dB @ 1kHz Output Voltage range: 0.8V to 2.0V Very low ground current – 23µA under full load Bias supply voltage range: 2.5V to 5.5V Stable with 1µF ceramic output capacitor 150mA maximum output current at 1.6V input voltage Very fast transient response – ideal for digital loads Thermal shutdown and current limit protection Tiny 6-pin 1.6mm x 1.6mm Thin MLF® package Cost effective 6-pin TSOT-23 package Applications • • • • Mobile Phones PDAs GPS Receivers Portable Electronics ___________________________________________________________________________________________________________ Typical Application MIC5308 BIAS Li-Ion 2.7V to 4.2V MIC23050 DC-to-DC Converter VIN CBIAS 1µF CIN 1µF VOUT 1.2V / 150mA EN GND BYP CBYP 10nF COUT 1µF ULDO is a trademark of Micrel, Inc. 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 May 2008 M9999-051508-D Micrel, Inc. MIC5308 Ordering Information Part Number Voltage Marking Codes Temperature Range Package MIC5308-1.2YMT 1.2V ▲ MIC5308-1.5YMT 1.5V ▲ 1R2 –40° to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® 1R5 –40° to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5308-1.8YMT 1.8V ▲ 1R8 –40° to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5308YMT Adj. ▲ ARA –40° to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® MIC5308-1.2YD6 MIC5308-1.5YD6 1.2V QR12 –40° to +125°C 6-Pin TSOT-23 1.5V QR15 –40° to +125°C 6-Pin TSOT-23 MIC5308-1.8YD6 1.8V QR18 –40° to +125°C 6-Pin TSOT-23 MIC5308YD6 Adj. QRAA –40° to +125°C 6-Pin TSOT-23 Notes For other voltage options. Contact Micrel Marketing for details. ▲ Pin 1 identifier = . ® MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration BIAS 1 6 BYP/ADJ GND 2 5 EN VIN 3 4 VOUT BIAS GND VIN 3 2 1 4 5 6 BYP/ADJ EN 6-Pin 1.6mm x 1.6mm Thin MLF® (MT) VOUT 6-Pin TSOT-23 (D6) Pin Description Pin Number Thin MLF-6 Pin Number Pin Name Pin Function 3 1 VIN Power Input for LDO. 2 2 GND Ground 1 3 BIAS Bias Input Voltage. BYP 6 4 Bypass: Connect a capacitor to ground to reduce noise and reduce ripple rejection. ADJ Adjustable: Feedback input from external resistor divider. Enable Input: Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. TSOT-23-6 5 5 EN 4 6 VOUT Output of regulator. HS Pad – EPAD Exposed heatsink pad connected to ground internally. May 2008 2 M9999-051508-D Micrel, Inc. MIC5308 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ............................................ 0V to VBIAS Bias Supply Voltage (VBIAS).................................. 0V to +6V Enable Voltage (VEN)........................................... 0V to VBIAS Power Dissipation, ................................ Internally Limited(3) Lead Temperature (soldering, 10µsec.)..................... 260°C Storage Temperature (Ts) .........................–65°C to +150°C ESD Rating(4) .................................................................. 3kV Supply Voltage (VIN)........................................+1.6V to VBIAS Bias Supply Voltage (VBIAS).......................... +2.5V to +5.5V Enable Input Voltage (VEN)...................................0V to VBIAS Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance 1.6x1.6 MLF-6 (θJA) ...........................................90°C/W TSOT-23-6 (θJA)...............................................235°C/W Electrical Characteristics VBIAS = 3.6V; VIN = VOUT + 1V; VIN ≤ VBIAS; COUT = 1.0µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted. Parameter Condition Min Output Voltage Accuracy Variation from nominal VOUT –2.0 Reference Voltage ADJ pin voltage VBIAS Line Regulation VIN Line Regulation Load Regulation Dropout Voltage Ground Pin Current (5) 0.7595 Typ Max Units +2.0 % 0.775 0.7905 V VBIAS = 3.6 to 5.5V, VIN = VOUT + 1V 0.01 0.3 %/V VIN = VOUT + 1V, VBIAS = 5.5V 0.02 0.2 %/V IOUT = 100µA to 150mA 0.2 1 % IOUT = 150mA 45 150 mV IOUT = 100µA to 150mA Ground Pin Current in Shutdown VEN ≤ 0.2V VIN Ripple Rejection f = up to 1kHz; COUT = 1.0µF; no CBYP f = up to 1kHz;COUT = 1.0µF; CBYP = 10nF 50 f = 20kHz; COUT = 1.0µF; CBYP = 10nF Current Limit f = up to 1kHz;COUT = 1.0µF; CBYP = 10nF Output Voltage Noise f = 20kHz; COUT = 1.0µF; CBYP = 10nF 180 23 35 µA 0.01 2.0 µA 70 dB 90 dB 80 dB 325 mA 28 µVRMS Enable Inputs (EN) Enable Input Voltage 0.2 Logic Low 1.2 Logic High Enable Input Current Turn-on Time V V VIL ≤ 0.2V 0.17 1 µA VIH ≥ 1.2V 1.5 1 µA COUT = 1.0µF; CBYP = 10nF 150 500 µs 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. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 5. IGND = IIN + IBIAS – IOUT. May 2008 3 M9999-051508-D Micrel, Inc. MIC5308 Typical Characteristics Power Supply Rejection Ratio (V IN) -120 100µA -100 -90 100mA -100 -80 100µA (no byp) -80 -60 Power Supply Rejection Ratio (VBIAS) 50mA -40 V = V IN OUT + 1V VOUT = 1.2V -20 COUT = 1µF CBYP = 0.01µF 0 10 100 1K 10K 100K FREQUENCY (Hz) 10 9 1M Ground Current (V IN) vs. Output Current 2 1 VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1µF 25 50 75 100 125 150 OUTPUT CURRENT (mA) Ground Current (V IN) vs. V IN 150mA Dropout Voltage vs. Output Current 0 0 25 50 75 100 125 150 OUTPUT CURRENT (mA) Bias Current vs. Enable Voltage 40 COUT = 1µF 80 25 50 75 100 125 150 OUTPUT CURRENT (mA) Dropout Voltage vs. Temperature 0 0 150mA 30 VBIAS = 5.5V VOUT = 1.8V COUT = 1µF 5 1.10 12 10 0 VIN = 2.2V VBIAS = 3.6V COUT = 1µF CBYP = 1µF 40 1 2 3 4 5 ENABLE VOLTAGE (V) Output Voltage vs. Temperature 20 10 0 1.30 COUT = 1µF 20 40 60 80 TEMPERATURE (°C) Output Voltage vs. Output Current 1.25 1.20 VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1µF IOUT = 100µA 1.15 25 50 75 100 125 150 OUTPUT CURRENT (mA) Ground Current (Total) vs. Output Current 18 16 14 50 150mA 1.20 15 20 40 60 80 TEMPERATURE (°C) 60 10 1.30 VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1µF 70 100µA 1.25 25 20 May 2008 2 15 35 30 0 0 4 20 40 10 5 VIN = 2.2V VBIAS = 3.6V COUT = 1µF CBYP = 1µF 25 VBIAS = 5.5V VOUT = 1.8V COUT = 1µF 30 100µA 22 20 6 30 100µA 1 0 150mA 28 26 24 35 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V) 50 45 Ground Current (V BIAS) vs. Output Current 8 2 1 4 3 1M 10 3 6 5 4 3 2 12 5 4 8 7 50mA -20 VIN = 2.8V V = 1.8V -10 OUT COUT = 1µF 0 10 100 1K 10K 100K FREQUENCY (Hz) 16 9 8 7 6 5 14 7 6 10 9 -70 -60 -30 8 0 0 100µA -50 150mA -40 150mA 10 Ground Current (V IN) vs. Temperature 20 40 60 80 TEMPERATURE (°C) 4 1.15 1.10 VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1µF 25 50 75 100 125 OUTPUT CURRENT (mA) M9999-051508-D Micrel, Inc. MIC5308 Typical Characteristics (continued) Output Voltage vs. V IN 2.0 1.8 0.900 0.850 1.4 100µA 1.2 0.825 0.800 1.0 0.8 150mA 1 2 3 VIN (V) 4 350 300 200 0.750 VBIAS = 5.5V VOUT = 1.2V COUT = 1µF 0.4 0.2 400 Current Limit vs. VIN 250 0.775 0.6 10 VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1µF IOUT = 100µA 0.875 1.6 0 0 Reference Voltage vs. Temperature 150 0.725 0.700 5 20 40 60 80 TEMPERATURE (°C) VOUT = 1.8V VBIAS = 3.6V 100 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V) Output Noise Spectral Density 1 0.1 0.01 C OUT = 1µF CBYP = 0.01µF ILOAD 0.001 10 100 1K 10K 100K FREQUENCY (Hz) May 2008 1M 5 M9999-051508-D Micrel, Inc. MIC5308 Functional Characteristics May 2008 6 M9999-051508-D Micrel, Inc. MIC5308 Functional Diagram MIC5308 Block Diagram May 2008 7 M9999-051508-D Micrel, Inc. MIC5308 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 0.01µF 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 MIC5308 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Applications Information The MIC5308 is a high performance, low-dropout linear regulator designed for low current applications requiring fast transient response. The MIC5308 utilizes two input supplies, significantly reducing dropout voltage, perfect for low-voltage, DC-to-DC conversion. The MIC5308 requires a minimum of external components. The MIC5308 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC5308. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. 1µF ceramic capacitor from VBIAS to ground helps reduce high frequency noise from being injected into the control circuitry from the bias rail and is good design practice. Minimum Load Current The MIC5308, unlike most other regulators, does not require a minimum load to maintain output voltage regulation. Adjustable Regulator Design The MIC5308 adjustable version allows programming the output voltage anywhere between 0.8Vand 2V. Two resistors are used. The resistor values are calculated by: Input Supply Voltage VIN provides the supply to power the LDO. The minimum input voltage is 1.6V, allowing conversion from low voltage supplies. ⎞ ⎛V R1 = R2 × ⎜⎜ OUT − 1⎟⎟ 0 . 775 ⎠ ⎝ Where VOUT is the desired output voltage. Output Capacitor The MIC5308 requires an output capacitor of 1µF 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 1µF 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. Enable/Shutdown The MIC5308 comes with a single 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. Thermal Considerations The MIC5308 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 3.3V, the output voltage is 1.2V and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation: Input Capacitor The MIC5308 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1µF 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. May 2008 PD = (VIN – VOUT1) I OUT + VIN IGND Because this device is CMOS and the ground current is typically <100µA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (3.3V – 1.2V) × 150mA PD = 0.315W 8 M9999-051508-D Micrel, Inc. MIC5308 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: May 2008 ⎛ TJ(max) − TA PD(max) = ⎜⎜ θ JA ⎝ ⎞ ⎟ ⎟ ⎠ TJ(max) = 125°C, the maximum junction temperature of the die θJA thermal resistance = 90°C/W. 9 M9999-051508-D Micrel, Inc. MIC5308 Package Information 6-Pin 1.6mm x 1.6mm Thin MLF® (MT) 6-Pin TSOT-23 (D6) May 2008 10 M9999-051508-D Micrel, Inc. MIC5308 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. © 2007 Micrel, Incorporated. May 2008 11 M9999-051508-D