MAX1598

19-2584; Rev 0; 10/02 Low-Noise, Low-Dropout, 200mA Linear Regulator General Description The MAX1598 low-noise, low-dropout linear regulator operates from a 2.5V to 6.5V input and delivers up to 200mA. Typical output noise is 30µVRMS, and typical dropout is only 236mV at 200mA. The output voltage is preset to voltages from 2.5V to 5V in 100mV increments. Designed with an internal P-channel MOSFET pass transistor, the MAX1598 maintains a low 100µA supply current independent of the load current and dropout voltage. Other features include a 10nA logic-controlled shutdown mode, short-circuit and thermal-shutdown protection, and reverse battery protection. The device also includes an autodischarge function, which actively discharges the output voltage to ground when the device is placed in shutdown. The MAX1598 comes in a thin 5-pin SOT23 package. o 200mA Output Current o Low Output Noise: 30µVRMS o Low 55mV Dropout at 50mA Output o Low 85µA No-Load Supply Current o Low 100µA Operating Supply Current, Even in Dropout o Thermal-Overload and Short-Circuit Protection o Reverse Battery Protection o Output Current Limit o Preset Output Voltages o 10nA Logic-Controlled Shutdown Features MAX1598 Applications Cellular, Cordless, and PCS Phones PCMCIA Cards Modems Hand-Held Instruments Palmtop Computers Electronic Planners PART MAX1598EZKxy-T* Ordering Information TEMP RANGE -40°C to +85°C PIN-PACKAGE Thin SOT23-5 *xy is the output voltage code (see the Selector Guide at end of data sheet). Typical Operating Circuit TOP VIEW INPUT 2.5V TO 6.5V IN CIN 1µF ON OFF CBP 0.01µF OUT COUT 2.2µF OUTPUT PRESET 2.5V TO 5V 200mA Pin Configuration IN 1 5 OUT MAX1598 SHDN BP GND GND 2 MAX1598 SHDN 3 4 BP THIN SOT23-5 ________________________________________________________________ Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Low-Noise, Low-Dropout, 200mA Linear Regulator MAX1598 ABSOLUTE MAXIMUM RATINGS IN to GND ....................................................................-7V to +7V Output Short-Circuit Duration ............................................Infinite SHDN to GND..............................................................-7V to +7V SHDN to IN ...............................................................-7V to +0.3V OUT, BP to GND ..........................................-0.3V to (VIN + 0.3V) Continuous Power Dissipation (TA = +70°C) 5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C θJB (thin).........................................................................110°C/W Storage Temperature.........................................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°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(NOMINAL) + 0.5V) or 2.5V (whichever is greater), TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Input Voltage Output Voltage Accuracy Maximum Output Current Current Limit Ground-Pin Current ILIM IQ No load IOUT = 150mA IOUT = 1mA Dropout Voltage (Note 2) IOUT = 50mA IOUT = 200mA Line Regulation Load Regulation Output Voltage Noise SHUTDOWN SHDN Input Threshold SHDN Input Bias Current Shutdown Supply Current VIH VIL I SHDN IQ(SHDN) VIN = 2.5V to 5.5V VIN = 2.5V to 5.5V V SHDN = VIN VOUT = 0V CBP = 0.1µF COUT = 1µF, no load (Note 3) TA = +25°C TA = +85°C TA = +25°C TA = +85°C TA = +25°C TA = -40°C to +85°C 300 0.01 0.5 0.01 0.2 30 150 µs 300 Ω 1 2.0 0.4 1 V µA µA ∆VLNR ∆VLDR en VIN = 2.5V or (VOUT + 0.1V) to 6.5V, IOUT = 1mA IOUT = 0.1mA to 120mA, COUT = 1µF f = 10Hz to 100kHz, CBP = 0.01µF COUT = 10µF COUT = 100µF -0.15 SYMBOL VIN IOUT = 0.1mA, TA = +25°C, VOUT ≥ 2.5V IOUT = 0.1mA to 120mA, TA = -40°C to +85°C, VOUT ≥ 2.5V CONDITIONS MIN 2.5 -1.4 -3 200 220 458 85 100 1.1 55 236 0 0.01 30 20 +0.15 0.04 %/V %/mA µVRMS 120 mV 180 TYP MAX 6.5 +1.4 +2 % mA mA µA UNITS V Shutdown Exit Delay Resistance Shutdown Discharge 2 _______________________________________________________________________________________ Low-Noise, Low-Dropout, 200mA Linear Regulator ELECTRICAL CHARACTERISTICS (continued) (VIN = (VOUT(NOMINAL) + 0.5V) or 2.5V (whichever is greater), TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER THERMAL PROTECTION Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis TSHDN ∆TSHDN 155 15 °C °C SYMBOL CONDITIONS MIN TYP MAX UNITS MAX1598 Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed through correlation using guaranteed by design (GBD) methods. Note 2: The dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V. Note 3: Time needed for VOUT to reach 95% of final value. __________________________________________Typical Operating Characteristics (VIN = (VOUT(NOMINAL) + 0.5V) or 2.5V (whichever is greater), CIN = 1µF, COUT = 2.2µF, CBP = 0.01µF, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. LOAD CURRENT (MAX1598EZK25) MAX1598-01 OUTPUT VOLTAGE vs. LOAD CURRENT (MAX1598EZK50) MAX1598-02 GROUND-PIN CURRENT vs. LOAD CURRENT 105 GROUND-PIN CURRENT (µA) 100 95 90 85 80 75 70 65 MAX1598EZK25 MAX1598EZK50 MAX1598-03 2.60 5.2 110 OUTPUT VOLTAGE (V) 2.50 OUTPUT VOLTAGE (V) 2.55 5.1 5.0 2.45 4.9 2.40 0 50 100 150 200 LOAD CURRENT (mA) 4.8 0 50 100 150 200 LOAD CURRENT (mA) 60 0 50 100 150 200 LOAD CURRENT (mA) GROUND-PIN CURRENT vs. INPUT VOLTAGE (MAX1598EZK25) MAX1598-04 GROUND-PIN CURRENT vs. INPUT VOLTAGE (MAX1598EZK50) MAX1598-05 OUTPUT VOLTAGE vs. INPUT VOLTAGE NO LOAD 5 OUTPUT VOLTAGE (V) MAX1598EZK50 4 3 2 1 0 MAX1598EZK25 MAX1598-06 120 ILOAD = 50mA GROUND-PIN CURRENT (µA) 100 80 NO LOAD 60 40 20 0 0 1 2 3 4 5 6 INPUT VOLTAGE (V) 120 100 80 ILOAD = 50mA 6 GROUND-PIN CURRENT (µA) NO LOAD 60 40 20 0 0 1 2 3 4 5 6 INPUT VOLTAGE (V) 0 1 2 3 4 5 6 INPUT VOLTAGE (V) _______________________________________________________________________________________ 3 Low-Noise, Low-Dropout, 200mA Linear Regulator MAX1598 Typical Operating Characteristics (continued) (VIN = (VOUT(NOMINAL) + 0.5V) or 2.5V (whichever is greater), CIN = 1µF, COUT = 2.2µF, CBP = 0.01µF, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. TEMPERATURE (MAX1598EZK25) MAX1598-07 OUTPUT VOLTAGE vs. TEMPERATURE (MAX1598EZK50) MAX1598-08 GROUND-PIN CURRENT vs. TEMPERATURE 180 GROUND-PIN CURRENT (µA) 160 140 120 100 80 60 40 20 MAX1598EZK25 MAX1598EZK50 ILOAD = 50mA MAX1598-09 MAX1598-15 MAX1598-12 2.60 ILOAD = 50mA 2.55 5.2 ILOAD = 50mA 5.1 200 OUTPUT VOLTAGE (V) 2.50 OUTPUT VOLTAGE (V) 5.0 2.45 4.9 2.40 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) 4.8 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) DROPOUT VOLTAGE vs. LOAD CURRENT (MAX1598EZK25) MAX1598-10 DROPOUT VOLTAGE vs. LOAD CURRENT (MAX1598EZK50) MAX1598-11 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 70 60 50 PSRR (dB) 40 30 20 COUT = 1µF COUT = 10µF 300 250 DROPOUT VOLTAGE (mV) 200 TA = +85°C 150 100 50 0 0 40 60 120 160 TA = +25°C 300 250 DROPOUT VOLTAGE (mV) 200 150 100 50 0 TA = -40°C TA = +85°C TA = +25°C TA = -40°C 10 0 0 40 80 120 160 200 ILOAD = 50mA CBP = 0.1µF 0.01 0.1 1 10 100 1000 200 LOAD CURRENT (mA) LOAD CURRENT (mA) FREQUENCY (kHz) OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY MAX1598-13 OUTPUT NOISE vs. BP CAPACITANCE 70 OUTPUT NOISE (µVRMS) 60 50 MAX1598EZK50 40 30 20 MAX1598EZK25 10 0 10 0 0.001 0.01 BP CAPACITANCE (µF) 0.1 1 MAX1598EZK30 COUT = 10µF ILOAD = 10mA f = 10Hz to 100kHz MAX1598-14 OUTPUT NOISE vs. LOAD CURRENT 60 50 OUTPUT NOISE (µVRMS) 40 MAX1598EZK30 30 20 COUT = 10µF CBP = 0.01µF f = 10Hz to 100kHz 10 100 1000 MAX1598EZK25 MAX1598EZK50 OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz) 10 CBP = 0.01µF ILOAD = 10mA 80 1 COUT = 1µF 0.1 COUT = 10µF 0.01 0 1 10 FREQUENCY (kHz) 100 1000 LOAD CURRENT (mA) 4 _______________________________________________________________________________________ Low-Noise, Low-Dropout, 200mA Linear Regulator Typical Operating Characteristics (continued) (VIN = (VOUT(NOMINAL) + 0.5V) or 2.5V (whichever is greater), CIN = 1µF, COUT = 2.2µF, CBP = 0.01µF, TA = +25°C, unless otherwise noted.) OUTPUT NOISE 10Hz TO 100kHz MAX1598-16 MAX1598 REGION OF STABLE COUT ESR vs. LOAD CURRENT MAX1598-17 100 10 COUT ESR (Ω) COUT = 10µF VOUT 50µV/div 1 COUT = 2.2µF STABLE REGION 0.1 0.01 1ms/div MAX1598EZK25, COUT = 10µF, ILOAD = 10mA, CBP = 0.1µF 0 50 100 150 200 LOAD CURRENT (mA) LINE-TRANSIENT RESPONSE MAX1598-18 LOAD-TRANSIENT RESPONSE MAX1598-19 LOAD-TRANSIENT RESPONSE NEAR DROPOUT MAX1598-20 4V 3V 3.01V VIN 3.00V 2.99V VOUT 3.01V 3.00V 2.99V VOUT 3.001V 3.000V 2.999V VOUT 50mA ILOAD 50mA ILOAD 100µs/div MAX1598EZK30, ILOAD = 50mA 10µs/div MAX1598EZK30, VIN = VOUT + 0.5V, CIN = 10µF, ILOAD = 0 TO 50mA 10µs/div MAX1598EZK30, VIN = VOUT + 0.1V, CIN = 10µF, ILOAD = 0 TO 50mA MAX1598EZK25 SHUTDOWN EXIT DELAY MAX1598-21 MAX1598EZK50 SHUTDOWN EXIT DELAY MAX1598-22 ENTERING SHUTDOWN MAX1598-23 2V 0V VSHDN CBP = 0.01µF 2V 0V VSHDN CBP = 0.01µF 2V 0V 5V V SHDN 2V CBP = 0.1µF VOUT 4V CBP = 0.1µF VOUT VOUT 1V 2V 0V 0V 5µs/div ILOAD = 50mA 500µs/div NO LOAD 0V 5µs/div ILOAD = 50mA _______________________________________________________________________________________ 5 Low-Noise, Low-Dropout, 200mA Linear Regulator MAX1598 ______________________________________________________________Pin Description PIN 1 2 3 4 5 NAME IN GND SHDN BP OUT FUNCTION Regulator Input. Supply voltage can range from 2.5V to 6.5V. Bypass with a 1µF capacitor to GND (see the Capacitor Selection and Regulator Stability section). Ground. This pin also functions as a heatsink. Solder to a large pad or the circuit-board ground plane to maximize power dissipation. Active-Low Shutdown Input. A logic low reduces the supply current to 10nA and causes the output voltage to discharge to GND. Connect to IN for normal operation. Reference-Noise Bypass. Bypass with a low-leakage, 0.01µF ceramic capacitor for reduced noise at the output. Regulator Output. Sources up to 200mA. Bypass with a 2.2µF (