MIC5202 Micrel MIC5202 Dual 100mA Low-Dropout Voltage Regulator Preliminary Information General Description Features The MIC5202 is a family of dual linear voltage regulators with very low dropout voltage (typically 17mV at light loads and 210mV at 100mA), and very low ground current (1mA at 100mA output–each section), offering better than 1% initial accuracy with a logic compatible ON/OFF switching input. Designed especially for hand-held battery powered devices, the MIC5202 is switched by a CMOS or TTL compatible logic signal. This ENABLE control my be tied directly to VIN if unneeded. When disabled, power consumption drops nearly to zero. The ground current of the MIC5202 increases only slightly in dropout, further prolonging battery life. Key MIC5202 features include protection against reversed battery, current limiting, and over-temperature shutdown. • • • • • • • • • • • • The MIC5202 is available in several fixed voltages. Other options are available; contact Micrel for details. High output voltage accuracy Variety of output voltages Guaranteed 100mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Reverse-battery protection Zero OFF mode current Logic-controlled electronic shutdown Available in SO-8 package Applications • • • • • • • Cellular Telephones Laptop, Notebook, and Palmtop Computers Battery Powered Equipment PCMCIA VCC and VPP Regulation/Switching Bar Code Scanners SMPS Post-Regulator/ DC to DC Modules High Efficiency Linear Power Supplies Ordering Information Part Number Pin Configuration Volts Accuracy Temperature Range* Package MIC5202-3.0BM 3.0 1% –40°C to +125°C SO-8 MIC5202-3.3BM 3.3 1% –40°C to +125°C SO-8 MIC5202-4.8BM 4.85 1% –40°C to +125°C SO-8 MIC5202-5.0BM 5.0 1% –40°C to +125°C SO-8 * Junction Temperature Other voltages are available; contact Micrel for details. Output A Enable A Output B Enable B ENABLE pins may be tied directly to VIN 3-135 GROUND ENABLE (B) Both GROUND pins must be tied to the same potential. VIN (A) and VIN (B) may run from separate supplies. MIC5202-3.3 July 1998 VIN (A) ENABLE (A) VIN (B) MIC5202-xxBM Typical Application 1µ (x2) VOUT (A) GROUND VOUT (B) 3 MIC5202 Micrel Absolute Maximum Ratings Recommended Operating Conditions Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its specified Operating Ratings. Input Voltage ............................................................... 2.5V to 26V Operating Junction Temperature Range ............. –40°C to +125°C ENABLE Input Voltage ..................................................... 0V to VIN Power Dissipation ............................................... Internally Limited Lead Temperature (Soldering, 5 seconds) .......................... 260°C Operating Junction Temperature Range ............. –40°C to +125°C Input Supply Voltage ................................................ –20V to +60V ENABLE Input Voltage ............................................. –20V to +60V SO-8 θJA ....................................................................... See Note 1 Electrical Characteristics Limits in standard typeface are for TJ = 25°C and limits in boldface apply over the junction temperature range of –40°C to +125°C. Specifications are for each half of the (dual) MIC5202. Unless otherwise specified, VIN = VOUT + 1V, IL = 1mA, CL = 10µF, and VCONTROL ≥ 2.0V. Symbol Parameter Condition Min VO Output Voltage Variation from specified VOUT Accuracy ∆VO ∆T Output Voltage Temperature Coef. (Note 2) ∆VO VO Line Regulation ∆VO VO VIN – VO Typ Max Units 1 2 % 40 150 ppm/°C VIN = VOUT + 1 V to 26V 0.004 0.10 0.40 % Load Regulation IL = 0.1mA to 100mA (Note 3) 0.04 0.16 0.30 % Dropout Voltage (Note 4) IL = 100µA IL = 20mA IL = 30mA IL = 50mA IL = 100mA 17 130 150 180 225 –1 –2 mV 350 IQ Quiescent Current VCONTROL ≤ 0.7V (Shutdown) 0.01 µA IGND Ground Pin Current VCONTROL ≥ 2.0V, IL = 100µA IL = 20mA IL = 30mA IL = 50mA IL = 100mA 170 270 330 500 1200 µA 1500 PSRR Ripple Rejection 75 dB IGNDDO Ground Pin Current at Dropout VIN = 0.5V less specified VOUT, IL = 100µA (Note 5) 270 ILIMIT Current Limit VOUT = 0V 280 mA ∆VO ∆PD Thermal Regulation (Note 6) 0.05 %/W en Output Noise 100 µV 330 µA Control Input VIL IIL IH Input Voltage Level Logic Low Logic High Control Input Current OFF ON 0.7 V 2.0 VIL ≤ 0.7V VIH ≥ 2.0V 0.01 8 3-136 µA 50 July 1998 MIC5202 Micrel 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: P(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 junction to ambient thermal resistance of the MIC5202BM is 160°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. Parts are tested for load regulation in the load range from 0.1mA to 100mA. 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 100mA load pulse at VIN = 26V for t = 10ms, and is measured separately for each section. 3 Typical Characteristics (Each Regulator—2 Regulators/Package) Dropout Voltage vs. Output Current Dropout Voltage vs. Temperature 0.4 150 100 50 0 0.01 0.3 IL = 100mA 0.2 0.1 IL = 1mA 0.0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 0.1 1 10 100 1000 OUTPUT CURRENT (mA) Ground Current vs. Output Current 1 0.1 0.01 July 1998 0.1 1 10 100 OUTPUT CURRENT (mA) 1.2 IL = 100mA 0.8 0.6 0.4 IL = 1mA 0.2 0.0 0 2 4 6 8 SUPPLY VOLTAGE (V) 3-137 2.0 1.5 1.0 IL = 100µA, 1mA 0.5 0 2 4 6 8 INPUT VOLTAGE (V) 10 3.5 1.4 1.0 IL = 100mA 2.5 Output Voltage vs. Output Current Ground Current vs. Supply Voltage 1.6 GROUND CURRENT (mA) GROUND CURRENT (mA) 10 3.0 0.0 OUTPUT VOLTAGE (V) 200 3.5 OUTPUT VOLTAGE (V) DROPOUT VOLTAGE (V) DROPOUT VOLTAGE (mV) 250 Dropout Characteristics 10 3.0 2.5 2.0 CIN = 2.2µF COUT = 4.7µF 1.5 1.0 0.5 0.0 0.0 0.1 0.2 OUTPUT CURRENT (A) 0.3 MIC5202 Micrel Ground Current vs. Temperature Ground Current vs. Temperature 0.20 0.15 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 3.3 CURVES APPLICABLE AT 100µA AND 100mA 3.0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) OUTPUT (mA) ∆ OUTPUT (mV) 200 150 CIN = 2.2µF COUT = 4.7µF VOUT = 3.3V 2 3 4 5 6 INPUT VOLTAGE (V) VOUT = 3.3V 200 180 160 140 VOUT = 0V (SHORT CIRCUIT) 120 100 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 0 -10 200 100 0 -2 0 2 4 6 TIME (ms) ∆ OUTPUT (mV) 100 80 60 8 3.28 0 3.25 3.24 3.23 3.22 3.21 3.20 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 20 0 1 2 3 4 5 6 7 8 9 10 SUPPLY VOLTAGE (V) 20 10 0 -10 -20 -30 300 CL = 47µF 200 100 0 -10 0 4 0.2 0.4 TIME (ms) 3-138 40 CL = 10 µF IL = 1mA 10 6 0 30 Line Transient -5 2 -0.2 10 20 TIME (ms) 15 8 -10 RL = 33Ω 10 15 20 25 30 35 TIME (ms) CIN = 2.2µF COUT = 4.7µF ILOAD = 1mA 3.27 3.26 10 CL = 1 µF IL = 1mA 5 5 3.30 3.29 Line Transient 10 INPUT (V) SUPPLY CURRENT (mA) CL = 4.7µF -20 -30 300 Supply Current vs. Supply Voltage (3.3V Version) 0 0 Load Transient 20 10 7 120 40 0 INPUT (V) SHORT CIRCUIT CURRENT (mA) 250 1 100 Minimum Input Voltage vs. Temperature 260 240 220 CL = 4.7 µF 200 -50 Load Transient 300 50 0 -100 -5 150 300 280 Short Circuit Current vs. Input Voltage 100 ∆ OUTPUT (mV) 0 50 100 TEMPERATURE (°C) OUTPUT (mA) ∆ OUTPUT (mV) 3.1 1.1 50 ∆ OUTPUT (mV) 3 DEVICES: HI / AVG / LO 1.2 MIN. INPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) 3.4 3.2 ILOAD = 100mA CIN = 2.2µF COUT = 4.7µF 100 Output Current vs. Temperature CIN = 2.2µF COUT = 4.7µF 3.5 1.3 1.0 -50 Output Voltage vs. Temp. (3.3V Version) 3.6 1.4 LOAD (mA) ILOAD = 100µA CIN = 2.2µF COUT = 4.7µF 0.25 0 Thermal Regulation (3.3V Version) 1.5 GROUND CURRENT (mA) GROUND CURRENT (mA) 0.30 0.6 0.8 5 0 8 -5 6 4 2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 TIME (ms) July 1998 MIC5202 Micrel Enable Transient (3.3V Version) 30 RL = 66Ω 20 10 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) 2 0 -2 -50 7 ENABLE CURRENT (µA) 10 IL = 1mA 1 0.1 0.01 2 0 50 100 150 200 250 300 TIME (µs) 1.6 CIN = 2.2µF COUT = 4.7µF 30 25 20 15 VEN = 5V 10 5 0 0 Enable Voltage Threshold vs. Temperature VEN = 2V -5 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 1x106 100x103 10x103 100x100 10x100 1x100 IL = 100mA 1x103 OUTPUT IMPEDANCE (Ω) IL = 100µA CL = 4.7 µF IL = 100mA -2 -50 50 100 150 200 250 300 TIME (µs) 35 1000 0.001 0 5 4 3 2 1 0 4 -1 Enable Current Threshold vs. Temperature Output Impedance 100 CL = 4.7 µF IL = 1mA ENABLE VOLTAGE (V) 0 Enable Transient (3.3V Version) ENABLE (V) OUTPUT (V) 40 ENABLE (V) SUPPLY CURRENT (mA) 50 5 4 3 2 1 0 4 -1 OUTPUT (V) Supply Current vs. Supply Voltage (3.3V Version) 60 CIN = 2.2µF COUT = 4.7µF 1.4 1.2 1 3 ON 0.8 OFF 0.6 0.4 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) FREQUENCY (Hz) Ripple vs. Frequency FREQUENCY (Hz) July 1998 FREQUENCY (Hz) 3-139 40 FREQUENCY (Hz) 1x106 0 100x103 20 10x103 0 1x106 20 IL = 100mA 60 1x103 40 80 100x100 RIPPLE VOLTAGE (dB) 60 100x103 1x106 100x10 3 10x103 10x100 0 1x103 20 IL = 1mA 10x103 40 80 1x103 60 100 100x100 IL = 100µA 10x100 80 RIPPLE VOLTAGE (dB) 100 100x100 RIPPLE VOLTAGE (dB) 100 Ripple vs. Frequency 10x100 Ripple vs. Frequency MIC5202 Micrel Applications Information Thermal Considerations Part I. Layout External Capacitors A 1µF capacitor is recommended between the MIC5202 output and ground to prevent oscillations due to instability. Larger values serve to improve the regulator's transient response. Most types of tantalum or aluminum electrolytics will be adequate; film types will work, but are costly and therefore not recommended. Many aluminum electrolytics have electrolytes that freeze at about –30°C, so solid tantalums are recommended for operation below –25°C. The important parameters of the capacitor are an effective series resistance of about 5Ω or less and a resonant frequency above 500kHz. The value of this capacitor may be increased without limit. 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 1 mA. A 1µF capacitor should be placed from the MIC5202 input to ground 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 supply. ENABLE Input The MIC5202 features nearly zero OFF mode current. When the ENABLE input is held below 0.7V, all internal circuitry is powered off. Pulling this pin high (over 2.0V) re-enables the device and allows operation. The ENABLE pin requires a small amount of current, typically 15µA. While the logic threshold is TTL/CMOS compatible, ENABLE may be pulled as high as 30V, independent of the voltage on VIN. The two portions of the MIC5202 may be enabled separately. The MIC5202-xxBM (8-pin surface mount package) has the following thermal characteristics when mounted on a single layer copper-clad printed circuit board. θJA PC Board Dielectric FR4 Ceramic 160°C/W 120°C/W Multi-layer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. The "worst case" value of 160°C/W assumes no ground plane, minimum trace widths, and a FR4 material board. Part II. Nominal Power Dissipation and Die Temperature The MIC5202-xxBM at a 25°C ambient temperature will operate reliably at up to 625mW power dissipation when mounted in the "worst case" manner described above. At an ambient temperature of 55°C, the device may safely dissipate 440mW. These power levels are equivalent to a die temperature of 125°C, the recommended maximum temperature for non-military grade silicon integrated circuits. General Notes The MIC5202 will remain stable and in regulation with no load in addition to the internal voltage divider, unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal shutdown is independant on both halfs of the dual MIC5202, however an over-temperature condition on one half might affect the other because of proximity. 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. Both MIC5202 GROUND pins must be tied to the same ground potential. Isolation between the two halfs allows connecting the two VIN pins to different supplies. 3-140 50 mil 245 mil 150 mil 30 mil 50 mil Minimum recommended board pad size, SO-8. July 1998