MIC5208 Micrel MIC5208 Dual 50mA LDO Voltage Regulator Preliminary Information General Description Features The MIC5208 is a dual linear voltage regulator with very low dropout voltage (typically 20mV at light loads and 250mV at 50mA), 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 MIC5208 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 MIC5208 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 50mA output 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 MIC5208-3.0BMM 3.0 3% –40°C to +125°C 8-lead MSOP MIC5208-3.3BMM 3.3 3% –40°C to +125°C 8-lead MSOP MIC5208-3.6BMM 3.6 3% –40°C to +125°C 8-lead MSOP MIC5208-4.0BMM 4.0 3% –40°C to +125°C 8-lead MSOP MIC5208-5.0BMM 5.0 3% –40°C to +125°C 8-lead MSOP Other voltages available. Contact Micrel for details. Typical Application MIC5208 Output A Output B 1µF 1µF 1 8 2 7 3 6 4 5 Enable A Enable B Enable may be connected to VIN 3-168 1997 MIC5208 Micrel Pin Configuration OUTA 1 8 INA GND 2 7 ENA OUTB 3 6 INB GND 4 5 ENB MIC5208BMM Pin Description 1997 Pin Number Pin Name Pin Function 1 OUTA Regulator Output A 2, 4 GND Ground: Both pins must be connected together. 3 OUTB Regulator Output B 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 3-169 3 MIC5208 Micrel 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 Electrical Characteristics VIN = VOUT + 1V; IL = 1mA; CL = 1µF, and VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C to +125°C; for one-half of dual MIC5208; unless noted. Symbol Parameter Conditions VO Output Voltage Accuracy variation from nominal VOUT ∆VO/∆T Output Voltage Temperature Coeffcient Note 2 ∆VO/VO Line Regulation ∆VO/VO VIN – VO Min Typical Max Units 3 4 % % 50 200 ppm/°C VIN = VOUT +1V to 16V 0.008 0.3 0.5 % % Load Regulation IL = 0.1mA to 50mA, Note 3 0.08 0.3 0.5 % % Dropout Voltage, Note 4 IL = 100µA IL = 20mA IL = 50mA 20 200 250 350 500 mV mV mV –3 –4 IQ Quiescent Current VEN ≤ 0.4V (shutdown) 0.01 10 µA IGND Ground Pin Current Note 5 VEN ≥ 2.0V (enabled), IL = 100µA IL = 20mA IL = 50mA 180 225 850 750 1200 µA µA µA IGNDDO Ground Pin Current at Dropout VIN = 0.5V less than designed VOUT, Note 5 200 300 µA ILIMIT Current Limit VOUT = 0V 180 250 mA ∆VO/∆PD Thermal Regulation Note 6 0.05 Input Voltage Level Logic Low Logic High shutdown enabled %/W Control Input VIL VIH VIL ≤ 0.6V VIH ≥ 2.0V IIL IIH Control Input Current General Note: Devices are ESD protected, however, handling precautions are recommended. 0.6 V V 1 50 µA µA 2.0 0.01 15 Note 1: 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 rated operating conditions. 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: PMAX = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. θJA of the 8-lead MSOP is 200°C/W, mounted on a PC board. Note 2: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 3: 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. Note 4: 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. Note 5: 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. Note 6: 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 50mA load pulse at VIN = 16V for t = 10ms. 3-170 1997 MIC5208 Micrel Typical Characteristics 4 CIN = 10µF COUT = 1µF 300 IL = 50mA 200 100 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 0.1 1 10 100 OUTPUT CURRENT (mA) VIN = VOUT + 1V IL = 50mA 1.5 1.0 0.5 0 2.5 CIN = 10µF COUT = 1µF 2.0 1.5 1.0 0.5 0 50 100 150 200 OUTPUT CURRENT (mA) 3.4 3.2 3.0 2.8 2.6 3 DEVICES HI / AVG / LO CURVES APPLICABLE AT 100µA AND 50mA 2.4 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 1997 7 140 120 100 80 60 CIN = 10µF COUT = 1µF 40 20 0 2.5 7 0 1 2 3 4 5 6 INPUT VOLTAGE (V) CIN = 10µF COUT = 1µF 3 2.0 1.5 1.0 IL = 50mA 0.5 IL = 100µA 60 40 20 0 -20 -40 -60 100 7 50 0 CL = 1µF -50 -2 0 2 4 6 8 10 12 14 16 TIME (ms) Short Circuit Current vs. Temperature Minimum Supply Voltage vs. Temperature 3.5 180 160 140 1 2 3 4 5 6 SUPPLY VOLTAGE (V) Thermal Regulation (MIC5208-3.3) 200 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) 3.6 1 2 3 4 5 6 SUPPLY VOLTAGE (V) 160 Output Voltage vs. Temperature 4.0 CIN = 10µF COUT = 1µF 0 0.0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) ∆ OUTPUT (mV) OUTPUT VOLTAGE (V) 3.0 CIN = 10µF COUT = 1µF Short Circuit Current vs. Input Voltage SHORT CIRCUIT CURRENT (mA) Output Voltage vs. Output Current 3.5 VOUT = 3.3V IL = 100µA 0.0 10 20 30 40 50 60 70 80 OUTPUT CURRENT (mA) 4.0 1 3.0 CIN = 10µF COUT = 1µF 120 100 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 3-171 MIN. SUPPLY VOLTAGE (V) 0 IL = 50mA Ground Current vs. Temperature GROUND CURRENT (mA) 500 2 Ground Current vs. Supply Voltage LOAD (mA) 1000 IL = 100µA 3 0 2.0 1500 3.8 IL = 100µA IL = 1mA Ground Current vs. Output Current 2000 OUTPUT VOLTAGE (V) 10 1 0.01 GROUND CURRENT (µA) DROPOUT VOLTAGE (mV) 100 0.0 Dropout Characteristics (MIC5208-3.3) 400 CIN = 10µF COUT = 1µF GROUND CURRENT (mA) DROPOUT VOLTAGE (V) 1000 0 Dropout Voltage vs. Temperature Dropout Voltage vs. Output Current V IL = 1mA = 3.3V OUT 3.4 CIN = 10µF COUT = 1µF 3.3 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) MIC5208 Micrel Typical Characteristics Output Impedance Load Transient IL = 100µA IL = 1mA 1 0 COUT = 1µF VIN = VOUT + 1 -200 100 -400 50 0 -50 -1 0 1x106 100x103 1x103 100x100 1x100 0.01 10x103 IL = 50mA 0.1 Load Transient 200 OUTPUT (mA) ∆ OUTPUT (mV) 10 OUTPUT (mA) ∆ OUTPUT (mV) 100 10x100 OUTPUT IMPEDANCE (Ω) 1000 1 2 3 4 5 TIME (ms) 6 7 8 100 0 COUT = 10µF VIN = VOUT + 1 -100 100 -200 50 0 -50 -5 0 5 10 TIME (ms) 15 20 FREQUENCY (Hz) Ripple Voltage vs. Frequency Line Transient (MIC5208-3.3) 60 3 2 CL = 1µF IL = 1mA 1 0 -1 INPUT (V) 0 8 -1 6 4 2 -0.2 0.0 1x106 100x10 3 10x103 10x100 0 1x103 20 IL = 100µA CL = 1µF VIN = VOUT + 1 CL = 11µF IL = 1mA 1 INPUT (V) 8 -2 40 2 ∆ OUTPUT (V) ∆ OUTPUT (V) 80 100x100 RIPPLE VOLTAGE (dB) 100 Line Transient (MIC5208-3.3) 0.2 0.4 0.6 TIME (ms) 0.8 6 4 2 -0.2 0.0 1.0 0.2 0.4 0.6 TIME (ms) 0.8 1.0 FREQUENCY (Hz) Ripple Voltage vs. Frequency Enable Characteristics (MIC5208-3.3) 60 4.0 3.0 OUTPUT (V) OUTPUT (V) 80 2.0 1.0 0.0 CL = 1µF IL = 100µA 2 0 -2 -2 1x106 100x10 3 10x103 10x100 0 1x103 20 IL = 1mA CL = 1µF VIN = VOUT + 1 ENABLE (V) ENABLE (V) 4 -1.0 40 100x100 RIPPLE VOLTAGE (dB) 100 Enable Characteristics (MIC5208-3.3) 0 2 4 6 TIME (µs) 8 5 4 3 2 1 0 4 -1 CL = 1µF IL = 100µA 2 0 -2 -0.2 0.0 10 0.2 0.4 0.6 TIME (ms) 0.8 1.0 FREQUENCY (Hz) Enable Voltage vs. Temperature Ripple Voltage vs. Frequency 40 1x106 100x10 3 10x103 1x103 100x100 0 IL = 50mA CL = 1µF VIN = VOUT + 1 40 CIN = 10µF COUT = 1µF IL = 1mA 1.25 1.00 VOFF VON 0.75 0.50 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) ENABLE CURRENT (µA) ENABLE VOLTAGE (mV) 60 10x100 RIPPLE VOLTAGE (dB) 80 20 Enable Current vs. Temperature 1.50 100 CIN = 10µF COUT = 1µF IL = 1mA 30 20 10 VEN = 5V VEN = 2V 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) FREQUENCY (Hz) 3-172 1997 MIC5208 Micrel Applications Information Supply/Ground Both MIC5208 GND pins must be connected to the same ground potential. INA and INB can each be connected to a different supply. Enable/Shutdown ENA (enable/shutdown) and ENB may be enabled separately. Forcing ENA/B high (> 2V) enables the associated regulator. ENA/B requires a small amount of current, typically 15µA. While the logic threshold is TTL/CMOS compatible, ENA/B may be forced as high as 20V, independent of VIN. Input Capacitor A 0.1µF 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. Output Capacitor An output capacitor is required between OUT and GND to prevent oscillation. Larger values improve the regulator’s transient response. The output capacitor value may be increased without limit. The output capacitor should have an ESR (effective series resistance) of about 5Ω or less and a resonant frequency above 500kHz. 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. No-Load Stability The MIC5208 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. Thermal Shutdown Thermal shutdown is independent on both halves of the dual MIC5208, however, an overtemperature condition in one half may affect the other half because of proximity. Thermal Considerations Multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. The MIC5208-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. 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”. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.22µF for current below 10mA or 0.1µF for currents below 1mA. 1997 PC Board Dielectric 3-173 3