MIC5210 Micrel MIC5210 Dual 100mA LDO Regulator Advance Information General Description Features The MIC5210 is a dual linear voltage regulator with very low dropout voltage (typically 10mV at light loads and 140mV at 100mA), very low ground current (225µA at 10mA output), and better than 3% initial accuracy. It also features individual logic-compatible enable/shutdown control inputs. Designed especially for hand-held battery powered devices, the MIC5210 can be switched by a CMOS or TTL compatible logic signal, or the enable pin can be connected to the supply input for 3-terminal operation. When disabled, power consumption drops nearly to zero. Dropout ground current is minimized to prolong battery life. Key features include current limiting, overtemperature shutdown, and protection against reversed battery. • • • • • • • • • • • The MIC5210 is available in 3.0V, 3.3V, 3.6V, 4.0V and 5.0V fixed voltage configurations. Other voltages are available; contact Micrel for details. • • • • • • Micrel Mini 8™ MSOP package Guaranteed 100mA outputs Low quiescent current Low dropout voltage Wide selection of output voltages Tight load and line regulation Low temperature coefficient Current and thermal limiting Reversed input polarity protection Zero off-mode current Logic-controlled electronic enable Applications Cellular telephones Laptop, notebook, and palmtop computers Battery powered equipment Bar code scanners SMPS post regulator/dc-to-dc modules High-efficiency linear power supplies Ordering Information Part Number Voltage Accuracy Junction Temp. Range* Package MIC5210-3.0BMM 3.0 1.0% –40°C to +125°C 8-lead MSOP MIC5210-3.3BMM 3.3 1.0% –40°C to +125°C 8-lead MSOP MIC5210-3.6BMM 3.6 1.0% –40°C to +125°C 8-lead MSOP MIC5210-4.0BMM 4.0 1.0% –40°C to +125°C 8-lead MSOP MIC5210-5.0BMM 5.0 1.0% –40°C to +125°C 8-lead MSOP Other voltages available. Contact Micrel for details. Typical Application MIC5210 Output A 1µF Output B 1 8 2 7 3 6 4 5 2.2µF CBYP 470µF Enable A Enable B 1µF Enable may be connected to VIN Low-Noise + Ultralow-Noise (Dual) Regulator MM8 and Micrel Mini 8 are trademarks of Micrel, Inc. Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com April 1997• 1 MIC5210 MIC5210 Micrel Pin Configuration OUTA 1 8 INA GND 2 7 ENA OUTB 3 6 INB BYPB 4 5 ENB MIC5210BMM Pin Description Pin Number Pin Name Pin Function 1 OUTA Regulator Output A 2 GND Ground: Both pins must be connected together. 3 OUTB Regulator Output B 4 BYPB Reference Bypass B: Connect external 470pF capacitor to GND to reduce output noise in regulator “B”. May be left open. 5 ENB Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. 6 INB Supply Input B 7 ENA Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. 8 INA Supply Input A Absolute Maximum Ratings Recommended Operating Conditions Supply Input Voltage (VIN) ............................ –20V to +20V Enable Input Voltage (VEN) ........................... –20V to +20V Power Dissipation (PD) ............................ Internally Limited Storage Temperature Range ................... –60°C to +150°C Lead Temperature (soldering, 5 sec.) ....................... 260°C Supply Input Voltage (VIN) ............................... 2.5V to 16V Enable Input Voltage (VEN) ................................. 0V to 16V Junction Temperature (TJ) ....................... –40°C to +125°C 8-lead MSOP (θJA) ................................................... Note 1 MIC5210 2 April 1997• MIC5210 Micrel Electrical Characteristics VIN = VOUT + 1V; IL = 100µA; CL = 1.0µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted. Symbol Parameter Conditions Min Typical VO Output Voltage Accuracy variation from specified VOUT ∆VO/∆T Output Voltage Temperature Coefficient Note 2 ∆VO/VO Line Regulation VIN = VOUT + 1V to 16V 0.004 0.012 0.05 %/V %/V ∆VO/VO Load Regulation IL = 0.1mA to 150mA (Note 3) 0.02 0.2 0.5 % % VIN – VO Dropout Voltage, Note 4 IL = 100µA 10 IL = 50mA 110 IL = 100mA 140 IL = 150mA 165 50 70 150 230 250 300 275 350 mV mV mV mV mV mV mV mV –1 –2 Max Units 1 2 % % 40 ppm/°C IGND Quiescent Current VEN ≤ 0.4V (shutdown) VEN ≤ 0.18V (shutdown) 0.01 1 5 µA µA IGND Ground Pin Current, Note 5 VEN ≥ 2.0V, IL = 100µA 80 IL = 50mA 350 IL = 100mA 600 IL = 150mA 1300 125 150 600 800 1000 1500 1900 2500 µA µA µA µA µA µA µA µA PSRR Ripple Rejection frequency = 100Hz, IL = 100µA 75 500 dB ILIMIT Current Limit VOUT = 0V 320 500 mA ∆VO/∆PD Thermal Regulation Note 6 0.05 %/W eno Output Noise IL = 50mA, CL = 2.2µF, 470pF from BYP to GND 260 nV Hz ENABLE Input VIL Enable Input Logic-Low Voltage regulator shutdown VIH Enable Input Logic-High Voltage regulator enabled IIL Enable Input Current VIL ≤ 0.4V VIL ≤ 0.18V VIH ≥ 2.0V VIH ≥ 2.0V IIH Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: 0.4 0.18 2.0 V V V 0.01 5 –1 –2 20 25 µA µA µA µA Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: 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. The θJA of the 8-lead MSOP (MM) is 200°C/W mounted on a PC board (see “Thermal Considerations” section for further details). Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current. Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 150mA load pulse at VIN = 16V for t = 10ms. April 1997• 3 MIC5210 MIC5210 Micrel Typical Characteristics Power Supply Ripple Rejection vs. Voltage Drop Turn-On Time vs. Bypass Capacitance DROPOUT VOLTAGE (mV) 10mA TIME (µs) 30 IOUT = 100mA 20 0.4 Power Supply Rejection Ratio 0 VIN = 6V VOUT = 5V -20 -60 IOUT = 100mA COUT = 1µF -40 -60 -80 IOUT = 100µA COUT = 1µF -100 1E+1 1k 1E+4 10k 1E+5 1M 1E+7 10M 10 1E+2 100k 1E+6 100 1E+3 FREQUENCY (Hz) MIC5210 120 40 0 40 80 120 160 OUTPUT CURRENT (mA) Power Supply Rejection Ratio VIN = 6V VOUT = 5V -40 -60 Noise Performance IOUT = 1mA COUT = 1µF Noise Performance 10 1 1 100mA 10mA 0.1 0.01 0.001 –40°C 80 -100 1E+1 1k 1E+4 10k 1E+5 1M 1E+7 10M 10 1E+2 100k 1E+6 100 1E+3 FREQUENCY (Hz) 10 VIN = 6V VOUT = 5V +25°C 160 -80 IOUT = 10mA COUT = 1µF -100 1E+1 1k 1E+4 10k 1E+5 1M 1E+7 10M 10 1E+2 100k 1E+6 100 1E+3 FREQUENCY (Hz) NOISE (µV/√Hz) -20 200 -20 -60 +125°C 240 0 VIN = 6V VOUT = 5V -40 Power Supply Rejection Ratio 280 0 10000 Power Supply Rejection Ratio -80 -100 1E+1 1k 1E+4 10k 1E+5 1M 1E+7 10M 10 1E+2 100k 1E+6 100 1E+3 FREQUENCY (Hz) 0 100 1000 CAPACITANCE (pF) PSRR (dB) 0.1 0.2 0.3 VOLTAGE DROP (V) 10 10 VOUT = 5V COUT = 10µF electrolytic 1mA 0.0001 1k 1E+4 1E+1 10 1E+2 1M 1E+7 10k 1E+5 100k 1E+6 10M 100 1E+3 FREQUENCY (Hz) 4 NOISE (µV/√Hz) 0 -40 -80 100 COUT = 1µF 10 -20 1000 PSRR (dB) RIPPLE REJECTION (dB) 1mA 40 0 PSRR (dB) 320 50 0 PSRR (dB) Dropout Voltage vs. Output Current 10000 60 100mA 0.1 0.01 1mA VOUT = 5V COUT = 10µF 0.001 electrolytic 10mA CBYP = 100pF 0.0001 1k 1E+4 1E+1 10 1E+2 1M 1E+7 10k 1E+5 100k 1E+6 10M 100 1E+3 FREQUENCY (Hz) April 1997• MIC5210 Micrel above 1MHz. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. Since many aluminum electrolytics have electrolytes that freeze at about –30°C, solid tantalums are recommended for operation below –25°C. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.47µF for current below 10mA or 0.33µF for currents below 1mA. Applications Information Enable/Shutdown Forcing EN (enable/shutdown) high (> 2V) enables the regulator. EN is compatible with CMOS logic gates. If the enable/shutdown feature is not required, connect EN to IN (supply input). Input Capacitor A 1µF capacitor should be placed from IN to GND if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input. Reference Bypass Capacitor No-Load Stability The MIC5210 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Dual-Supply Operation BYP (reference bypass) is connected to the internal voltage reference. A 470pF capacitor (CBYP) connected from BYP to GND quiets this reference, providing a significant reduction in output noise. CBYP reduces the regulator phase margin; when using CBYP, output capacitors of 2.2µF or greater are generally required to maintain stability. The start-up speed of the MIC5210 is inversely proportional to the size of the reference bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of CBYP. Likewise, if rapid turn-on is necessary, consider omitting CBYP. If output noise is not a major concern, omit CBYP and leave BYP open. When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. Thermal Considerations Multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. The MIC5210-xxBMM (8-lead MSOP) has a thermal resistance of 200°C/W when mounted on a FR4 board with minimum trace widths and no ground plane. Output Capacitor An output capacitor is required between OUT and GND to prevent oscillation. The minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used. 1.0µF minimum is recommended when CBYP is not used (see Figure 2). 2.2µF minimum is recommended when CBYP is 470µF (see Figure 1). Larger values improve the regulator’s transient response. The output capacitor value may be increased without limit. PC Board Dielectric θJA FR4 200°C MSOP Thermal Characteristics For additional heat sink characteristics, please refer to Micrel Application Hint 17, “Calculating P.C. Board Heat Sink Area For Surface Mount Packages”. The output capacitor should have an ESR (effective series resistance) of about 5Ω or less and a resonant frequency April 1997• 5 MIC5210 MIC5210 Micrel Package Information 0.122 (3.10) 0.112 (2.84) 0.199 (5.05) 0.187 (4.74) DIMENSIONS: INCH (MM) 0.120 (3.05) 0.116 (2.95) 0.036 (0.90) 0.032 (0.81) 0.043 (1.09) 0.038 (0.97) 0.012 (0.30) R 0.012 (0.03) 0.0256 (0.65) TYP 0.008 (0.20) 0.004 (0.10) 5° MAX 0° MIN 0.007 (0.18) 0.005 (0.13) 0.012 (0.03) R 0.039 (0.99) 0.035 (0.89) 0.021 (0.53) 8-Lead MSOP (MM) MM8™ Micrel Mini 8™ MIC5210 6 April 1997• MIC5210 April 1997• Micrel 7 MIC5210 MIC5210 Micrel MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. © 1997 Micrel Incorporated MIC5210 8 April 1997•