MAX8888EZK31+T

19-1859; Rev 4; 7/09 Low-Dropout, 300mA Linear Regulators in SOT23 The MAX8887/MAX8888 low-dropout linear regulators operate from a 2.5V to 5.5V input and deliver up to 300mA continuous (500mA pulsed) current. The MAX8887 is optimized for low-noise operation, while the MAX8888 includes an open-drain power-OK (POK) ouput flag. Both regulators feature exceptionally low 100mV dropout at 200mA. These devices are available in a variety of preset output voltages in the 1.5V to 3.3V range. An internal PMOS pass transistor allows the low 55µA supply current to remain independent of load, making these devices ideal for portable battery-powered equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, and notebook computers. Other features include a micropower shutdown mode, short-circuit protection, thermal shutdown protection, and an active-low open-drain POK output that indicates when the output is out of regulation. The MAX8887/MAX8888 are available in a thin 5-pin SOT23 package that is only 1mm high. ________________________Applications Notebook Computers Wireless Handsets Features ♦ Guaranteed 300mA Output Current (500mA for Pulsed Loads) ♦ Low 100mV Dropout at 200mA Load ♦ POK Output (MAX8888) ♦ 42µVRMS Output Noise (MAX8887) ♦ Preset Output Voltages (1.5V, 1.8V, 2.85V, and 3.3V) ♦ 55µA No-Load Supply Current ♦ Thermal-Overload and Short-Circuit Protection ♦ Foldback Output Current-Limit Protection ♦ 60dB PSRR at 1kHz ♦ 0.1µA Shutdown Current ♦ Thin 5-Pin SOT23 Package, 1mm High Ordering Information TEMP RANGE PART PINPACKAGE TOP MARK MAX8887EZK15+T -40°C to +85°C 5 SOT23 ADQD MAX8887EZK18+T -40°C to +85°C 5 SOT23 ADPX MAX8887EZK29+T -40°C to +85°C 5 SOT23 ADPY MAX8887EZK33+T -40°C to +85°C 5 SOT23 ADPZ MAX8887EZKxy+T* -40°C to +85°C 5 SOT23 — MAX8888EZK15+T -40°C to +85°C 5 SOT23 ADQE PDAs and Palmtop Computers MAX8888EZK18+T -40°C to +85°C 5 SOT23 ADQA Digital Cameras MAX8888EZK18/V+T -40°C to +85°C 5 SOT23 — PCMCIA Cards MAX8888EZK29+T -40°C to +85°C 5 SOT23 ADQB Hand-Held Instruments MAX8888EZK33+T -40°C to +85°C 5 SOT23 ADQC MAX8888EZKxy+T* -40°C to +85°C 5 SOT23 — Typical Operating Circuit *Other versions (xy) between +1.5 and +3.3V are available in 100mV increments. Contact factory for other versions. Minimum order quantity is 25,000 units. +Denotes a lead(Pb)-free RoHS-compliant package. /V denotes an automotive qualified part. Pin Configurations VOUT 300mA INPUT 2.5V TO 5.5V IN CIN 2.2µF OUT COUT 2.2µF MAX8887 MAX8888 TOP VIEW IN 1 5 OUT IN 1 5 OUT 4 POK POK ON SHDN GND 2 (BP) OFF GND MAX8887 GND 2 MAX8888 CBP 0.01µF SHDN 3 4 BP SHDN 3 ( ) ARE FOR MAX8887 ONLY. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX8887/MAX8888 General Description MAX8887/MAX8888 Low-Dropout, 300mA Linear Regulators in SOT23 ABSOLUTE MAXIMUM RATINGS IN, SHDN, POK, to GND...........................................-0.3V to +7V OUT, BP to GND ............................................-0.3 to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+500°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VIN = VOUT + 1V, SHDN = IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER Input Voltage Input Undervoltage Lockout Output Voltage Accuracy SYMBOL CONDITIONS VIN Current Limit Ground-Pin Current MAX UNITS 2.5 5.5 V 2.15 2.4 V TA = +25°C, IOUT = 100mA -1.2 +1.2 -2 +2 -3 +3 IOUT = 100µA to 300mA, TA = 0°C to +85°C Continuous 300 10ms pulse VOUT = 0 300 VOUT > 93% of nominal value 420 mA No load 55 IOUT = 300mA IOUT = 1mA 65 0.5 IOUT = 200mA 100 IOUT = 300mA 150 VOUT = +3.3V Line Regulation VIN = 2.5V or (VOUT + 0.4V) to 5.5V, IOUT = 5mA -0.15 0 MAX8887 10Hz to 100kHz, CBP = 0.01µF, COUT = 2.2µF, ESRCOUT < 0.1Ω 42 MAX8888 10Hz to 100kHz, COUT = 2.2µF, ESRCOUT < 0.1Ω 360 MAX8887 f < 1kHz, CBP = 0.01µF, COUT = 4.7µF, ESRCOUT < 0.1Ω 60 MAX8888 f < 1kHz, COUT = 2.2µF, ESRCOUT < 0.1Ω 40 Output Noise PSRR % mA 500 Dropout Voltage (Note 2) 2 TYP VIN rising (2% typical hysteresis) IOUT = 100µA to 300mA Maximum Output Current MIN 100 µA 200 mV 0.15 %/V µVRMS dB _______________________________________________________________________________________ Low-Dropout, 300mA Linear Regulators in SOT23 (VIN = VOUT + 1V, SHDN = IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.1 2 µA SHUTDOWN SHDN = GND, VIN = 5.5V Shutdown Supply Current SHDN Input Threshold VIH 2.5V ≤ VIN ≤ 5.5V VIL 2.5V ≤ VIN ≤ 5.5V 1.6 V 0.6 SHDN Input Bias Current SHDN = IN or GND 10 100 nA OUT Discharge Resistance in Shutdown SHDN = GND 650 1100 Ω 92.5 95 % 5.5 V ISINK = 1mA 0.1 V VPOK = 5.5V, SHDN = IN 100 nA POK (MAX8888 ONLY) POK Trip Level, Referred to OUT Set Point VOUT falling (1% typical hysteresis) 90 Operating IN Voltage Range for Valid POK 1.0 POK Output Voltage Low VOL POK Output Leakage Current THERMAL PROTECTION Thermal Shutdown Temperature 170 °C Thermal Shutdown Hysteresis 20 °C Note 1: All parts are 100% tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design. Note 2: Typical and maximum dropout voltage for different output voltages are shown in the Typical Operating Characteristics curves. Typical Operating Characteristics (Typical Operating Circuit, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT 0.8 0.6 2.0 1.5 1.0 0.5 0 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) 5.0 5.5 0.03 0.02 0.4 0.2 0.0 -0.2 0.01 0.0 -0.01 -0.4 -0.02 -0.6 -0.03 -0.8 -0.04 -1.0 2.0 IOUT = 0 VIN = VOUT + 500mV 0.04 % DEVIATION % DEVIATION (%) OUTPUT VOLTAGE (V) IOUT = 300mA 2.5 0.05 MAX8887/8 toc02 IOUT = 0 3.0 1.0 MAX8887/8 toc01 3.5 OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE MAX8887/8 toc03 OUTPUT VOLTAGE vs. INPUT VOLTAGE -0.05 0 50 100 150 200 LOAD CURRENT (mA) 250 300 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 3 MAX8887/MAX8888 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (Typical Operating Circuit, TA = +25°C, unless otherwise noted.) MAXIMUM VDROPOUT (mV) TA = +85°C 100 80 60 200 150 TYPICAL 100 TA = -40°C 40 50 20 0 50 100 150 200 250 100 ILOAD = 300mA 75 50 ILOAD = 0 0 2.5 300 125 25 0 0 MAX8887/8 toc06 IOUT = 200mA 250 GROUND-PIN CURRENT vs. INPUT VOLTAGE 150 GROUND-PIN CURRENT (µA) TA = +25°C 120 2.7 2.9 3.1 3.3 0 1.0 2.0 3.0 5.0 VOUT (V) INPUT VOLTAGE (V) GROUND-PIN CURRENT vs. LOAD CURRENT GROUND-PIN CURRENT vs. TEMPERATURE POWER-SUPPLY REJECTION RATIO vs. FREQUENCY VIN = 3.8V 60 40 70 66 60 64 50 62 60 58 56 20 MAX8887/8 toc09 80 IOUT = 0 VIN = VOUT + 500mV 68 PSRR (dB) VIN = 5.5V 70 GROUND-PIN CURRENT (µA) MAX8887/8 toc07 100 COUT = 2.2µF CBP = 0.01µF 40 30 20 54 10 52 0 50 0 50 100 150 200 250 300 -40 LOAD CURRENT (mA) -15 10 35 60 0 85 VOUT = 3.30V ILOAD = 30mA 0.01 MAX8887 ONLY 0.1 TEMPERATURE (°C) MAX8887 OUTPUT NOISE DC TO 1MHz 1 10 FREQUENCY (kHz) LOAD-TRANSIENT RESPONSE MAX8887/8 toc10 MAX8887/8 toc11 300mA IOUT 10mA VOUT 50mV/div AC-COUPLED VOUT 50µV/div VOUT = 3.3V VIN = 3.8V VOUT = 1.8V, VIN = 3.8V, ILOAD = 15mA 40ms/div 4 4.0 LOAD CURRENT (mA) MAX8887/8 toc08 VDROPOUT (mV) MAX8887/8 toc04 140 300 MAX8887/8 toc05 DROPOUT VOLTAGE vs. OUTPUT VOLTAGE DROPOUT VOLTAGE vs. LOAD CURRENT 160 GROUND-PIN CURRENT (µA) MAX8887/MAX8888 Low-Dropout, 300mA Linear Regulators in SOT23 10µs/div _______________________________________________________________________________________ 100 1000 Low-Dropout, 300mA Linear Regulators in SOT23 LOAD-TRANSIENT RESPONSE NEAR DROPOUT LINE-TRANSIENT RESPONSE MAX8887/8 toc13 MAX8887/8 toc12 300mA 4.5V IOUT 10mA VIN 4V VOUT 50mV/div AC-COUPLED VOUT 20mV/div AC-COUPLED VOUT = 3.3V VIN = 3.4V VOUT = 3.3V ILOAD = 100mA 100µs/div 10µs/div POK WAVEFORM SHUTDOWN WAVEFORM MAX8887/8 toc15 MAX8887/8 toc14 VSHDN VIN VOUT = 3.3V, RLOAD = 100Ω 2V/div 2V/div VOUT 1V/div DC-COUPLED VOUT 2V/div VPOK 2V/div VOUT = 3.3V, RLOAD = 10Ω 20ms/div 20µs/div Pin Description MAX8887 MAX8888 NAME 1 1 IN 2 2 GND 3 3 SHDN — 4 POK 4 — BP 5 5 OUT FUNCTION Regulator Input. Supply voltage can range from 2.5V to 5.5V. Bypass with 2.2µF capacitor to GND (see the Capacitor Selection and Regulator Stability section). Ground Active-Low Shutdown Input. A logic low reduces the supply current to below 0.1µA. In shutdown, POK and OUT are driven low. Connect to IN for normal operation. Open-Drain Active-Low POK Output. POK remains low while the output voltage (VOUT) is below the reset threshold. Connect a 100kΩ pullup resistor to OUT to obtain a logic level output. POK is driven low in shutdown. If not used, leave this pin unconnected. Reference Bypass. Bypass with a low-leakage 0.01µF ceramic capacitor. Regulator Output. Sources up to 300mA guaranteed. Bypass with 2.2µF (