19-1818; Rev 1; 10/01 Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 Features ♦ ♦ ♦ ♦ ♦ ♦ ♦ Two LDOs in Tiny SOT23 Up to 160mA Output Current (each LDO) 40µVRMS Output Noise (MAX8882) 72mV Dropout at 80mA Load Low 165µA Operating Supply Current 62dB PSRR (greater than 56dB to 100kHz) Independent Low-Power Shutdown Controls (MAX8883) ♦ Thermal-Overload and Short-Circuit Protection ♦ Output Current Limit Selector Guide VOUTA VOUTB MAX8882EUTJJ 2.85 2.85 AANR MAX8882EUTAQ 3.3 2.5 AAPW µP/DSP Core/IO Power MAX8882EUTA5 3.3 1.8 AARY Cellular and PCS Telephones MAX8882EUTQ5 2.5 1.8 AAPX PDAs and Palmtop Computers MAX8882EUTGG 3.0 3.0 AAZT Notebook Computers MAX8883EUTJJ 2.85 2.85 AANS Digital Cameras MAX8883EUTAQ 3.3 2.5 AAPY MAX8883EUTA5 3.3 1.8 AARZ MAX8883EUTQ5 2.5 1.8 AAPZ MAX8883EUTGG 3.0 3.0 AAZU ________________________Applications Hand-Held Instruments Pin Configurations PART TOP MARK ***Other combinations between 1.8V and 3.3V are available in 100mV increments. Contact factory for other versions. Minimum order quantity is 50,000 units. Ordering Information TOP VIEW OUTB 1 GND 2 6 MAX8882 5 PART SHUTDOWN TEMP RANGE PINPACKAGE MAX8882EUT_ _* Single -40°C to +85°C 6 SOT23-6 MAX8883EUT_ _* Dual -40°C to +85°C 6 SOT23-6 OUTA IN *See Selector Guide BP 3 4 Typical Operating Circuit SHDN SOT23-6 OUTA VIN 2.5V to 6.5V Pin Configurations continued at end of data sheet. 2.2µF VOUTA FIXED (1.8V to 3.3V) 2.2µF VOUTB FIXED (1.8V to 3.3V) MAX8882 MAX8883 OUTB SHDN_ IN 2.2µF GND (BP) 0.01µF ( ) ARE FOR MAX8882 ONLY. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX8882/MAX8883 General Description The MAX8882/MAX8883 dual, low-noise, low-dropout linear regulators operate from a +2.5V to +6.5V input and deliver up to 160mA each of continuous current. Both versions offer low output noise and low dropout of only 72mV at 80mA. Designed with an internal Pchannel MOSFET pass transistor, the MAX8882/ MAX8883 maintain a low 165µA supply current (both LDOs on), independent of the load current and dropout voltage. Other features include short-circuit protection and thermal-shutdown protection. The MAX8882 has a single shutdown input and provides an external reference bypass pin to improve noise performance. The MAX8883 includes two independent logic-controlled shutdown inputs. The MAX8882/MAX8883 are both available in a miniature 6-pin SOT23 package. MAX8882/MAX8883 Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 ABSOLUTE MAXIMUM RATINGS IN, SHDN, SHDNA, SHDNB, BP to GND...............-0.3V to +7.0V OUTA, OUTB to GND ..................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-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 = +3.6V, SHDN = SHDNA = SHDNB = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN Input Voltage Undervoltage Lockout Threshold TYP 2.5 VIN_ rising, hysteresis 40mV typical 2.15 2.25 MAX UNITS 6.5 V 2.40 V TA = +25°C, IOUT_ = 1mA -1 1 Output Voltage Accuracy IOUT_ = 1mA -2 2 -3 2 Maximum Output Current Continuous IOUT_ = 100µA to 160mA 160 Current Limit Ground Current Shutdown Supply Current SHDN_ Input Threshold SHDN_ Input Bias Current Dropout Voltage (Notes 2, 3) Line Regulation Output Voltage Noise 2 mA 160 550 No Load, VIN = 6.5V 165 IOUT_ = 80mA, both LDOs 170 SHDN_ = GND, TA = +25°C 0.01 SHDN_ = GND 0.1 VIH 265 1 1.6 VIL 0.4 SHDN_ = GND or IN, TA = +25°C 0 SHDN_ = GND or IN 100 0.05 IOUT_ = 1mA 1 IOUT_ = 40mA 36 IOUT_ = 80mA 72 144 0 0.2 VIN = (VOUT_ + 0.4V or 2.5V) to + 6.5V, IOUT_ = 1mA -0.2 % 10Hz to 100kHz, CBP = 0.01µF, COUT_ = 4.7µF, IOUT_ = 1mA MAX8882 40 10Hz to 100kHz, COUT_ = 4.7µF, IOUT_ = 10mA MAX8883 320 _______________________________________________________________________________________ mA µA µA V nA mV %/V µVRMS Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 (VIN = +3.6V, SHDN = SHDNA = SHDNB = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN TYP 100Hz, CBP = 0.01µF, COUT_ = 4.7µF MAX8882 62 100Hz, COUT_ = 4.7µF MAX8883 60 MAX UNITS Output Voltage AC PSRR dB Thermal Shutdown Temperature 160 °C Thermal Shutdown Hysteresis 10 °C Note 1: All units are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design. Note 2: The dropout voltage is defined as VIN - VOUT when VIN = VOUT (NOM). Specification only applies when VOUT ≥ 2.5V. Note 3: See the Typical Operating Characteristics for guaranteed specifications at voltages other than 3.3V. Typical Operating Characteristics (VOUT_ = 2.85V, IOUT_ = 80mA, VIN = +3.6V, COUT_ = 2.2µF, CBP = 0.01µF, and CIN = 2.2µF, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. LOAD CURRENT NO LOAD 100 50 0 140 120 100 80 60 1 2 3 4 5 100 80 60 40 20 20 0 0 10 20 30 40 50 60 70 80 -40 -15 10 35 60 85 LOAD CURRENT (mA) TEMPERATURE (°C) DROPOUT VOLTAGE vs. LOAD CURRENT DROPOUT vs. VOUT OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE DROPOUT (mV) 45 TA = -40°C GUARANTEED MAXIMUM 120 100 80 MEAN 60 15 20 30 40 50 LOAD CURRENT (mA) 60 70 80 0.8 0.6 0.4 0.2 0 -0.2 -0.4 40 -0.6 20 -0.8 0 0 1.0 MAX8882/83 toc06 160 140 TA = +85°C 30 180 OUTPUT VOLTAGE (%) 60 200 MAX8882/3 toc04 TA = +25°C 75 10 120 SUPPLY VOLTAGE (V) 90 0 80mA LOAD, BOTH OUTPUTS 140 40 6 MAX8882/3 toc03 160 0 0 DROPOUT VOLTAGE (mV) BOTH OUTPUTS LOADED 180 SUPPLY CURRENT (µA) 150 MAX8882/3 toc02 160 200 MAX8882/83 toc05 SUPPLY CURRENT (µA) 180 SUPPLY CURRENT (µA) 80mA LOAD, BOTH OUTPUTS 200 200 MAX8882/3 toc01 250 SUPPLY CURRENT vs. TEMPERATURE -1.0 2.5 2.7 2.9 VOUT (V) 3.1 3.3 -40 -25 -10 5 20 35 50 65 80 TEMPERATURE (°C) _______________________________________________________________________________________ 3 MAX8882/MAX8883 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VOUT_ = 2.85V, IOUT_ = 80mA, VIN = +3.6V, COUT_ = 2.2µF, CBP = 0.01µF, and CIN = 2.2µF, unless otherwise noted.) CHANNEL-TO-CHANNEL ISOLATION vs. FREQUENCY 60 40 30 20 10 0 100Ω LOAD 100 80 60 THERMAL COUPLING 40 CAPACITVE COUPLING 20 0 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 FREQUENCY (kHz) FREQUENCY (kHz) OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY MAX8882 OUTPUT NOISE (10Hz to 100kHz) MAX8882/3 toc09 10000 1000 MAX8882/3 toc10 PSRR (dB) 50 120 MAX8882/3 toc08 100Ω LOAD CHANNEL-TO-CHANNEL ISOLATION (dB) 70 MAX8882/3 toc07 PSRR vs. FREQUENCY NOISE DENSITY (nV/√Hz) MAX8882/MAX8883 Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 1000 500µV/div (AC-COUPLED) VOUT_ 100 10 0.01 0.1 1 10 100 1000 1ms/div LOAD TRANSIENT (VIN = 3.35V, ILOAD = 0 TO 80mA) LINE TRANSIENT MAX8882/3 toc11 MAX8882/3 toc12 4.5V VIN 3.5V 20mV/div (AC-COUPLED) VOUT_ 1V/div 20mV/div (AC-COUPLED) VOUT_ 50mA/div ILOAD 0 50µs/div 4 10µs/div _______________________________________________________________________________________ Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 LOAD TRANSIENT NEAR DROPOUT SHUTDOWN RESPONSE MAX8882/3 toc13 MAX8882/3 toc14 RLOAD = 100Ω 20mV/div VOUT OUTPUT VOLTAGE 20V/div 0 VIN = VOUT + 0.1V 50µA/div ILOAD 0 SHUTDOWN VOLTAGE 1V/div 0 10µs/div 1ms/div Pin Description PIN NAME FUNCTION 1 OUTB Regulator B Output. Sources up to 160mA continuous current. Bypass with a 2.2µF (<0.5Ω typ ESR) capacitor to GND (see the Capacitor Selection and Regulator Stability section). 2 2 GND Ground. This pin also functions as a heatsink. Solder to a large pad or the circuit-board ground plane to maximize thermal dissipation. 3 — BP MAX8882 MAX8883 1 — 3 Reference Noise Bypass. Bypass with a low-leakage 0.01µF ceramic capacitor for reduced noise at both outputs. SHDNA Shutdown A Input. A logic low shuts down regulator A. If SHDNA and SHDNB are both low, both regulators and the reference turn off, and supply current is reduced to 10nA. If either SHDNA or SHDNB is a logic high, the reference is on. Connect to IN for normal operation. — 4 SHDNB Shutdown B Input. A logic low shuts down regulator B. If SHDNA and SHDNB are both low, both regulators and the reference turn off, and supply current is reduced to 10nA. If either SHDNA or SHDNB is a logic high, the reference is on. Connect to IN for normal operation. 4 — SHDN Shutdown Input. A logic low shuts down both regulators and the reference, reducing the entire supply current to 10nA. Connect to IN for normal operation. 5 5 IN Regulator Input. Supply voltage can range from +2.5V to +6.5V. This input also supplies the on-chip reference. Bypass with 2.2µF to GND (see the Capacitor Selection and Regulator Stability section). 6 6 OUTA Regulator A Output. Sources up to 160mA continuous current. Bypass with a 2.2µF (<0.5Ω typ ESR) capacitor to GND (see the Capacitor Selection and Regulator Stability section). _______________________________________________________________________________________ 5 MAX8882/MAX8883 Typical Operating Characteristics (continued) (VOUT_ = 2.85V, IOUT_ = 80mA, VIN = +3.6V, COUT_ = 2.2µF, CBP = 0.01µF, and CIN = 2.2µF, unless otherwise noted.) The MAX8882/MAX8883 are low-noise, low-dropout, low-quiescent-current linear regulators designed primarily for battery-powered applications. These parts are available with preset output voltages ranging from 1.8V to 3.3V, and the parts can supply loads up to 160mA. Shutdown MAX8882 The MAX8882 has a single shutdown control input (SHDN). Drive SHDN low to shut down both outputs, reducing supply current to 10nA. Connect SHDN to a logic-high, or IN, for normal operation. MAX8883 The MAX8883 has independent shutdown control inputs (SHDNA and SHDNB). Drive SHDNA low to shut down OUTA. Drive SHDNB low to shut down OUTB. Drive both SHDNA and SHDNB low to shut down the entire chip, reducing supply current to 10nA. Connect both SHDNA and SHDNB to a logic-high, or IN, for normal operation. Internal P-Channel Pass Transistor The MAX8882/MAX8883 feature two 1Ω P-channel MOSFET pass transistors. A P-channel MOSFET provides several advantages over similar designs using PNP pass transistors, including longer battery life. It requires no base drive, which reduces quiescent current significantly. PNP-based regulators waste considerable current in dropout when the pass transistor saturates, and they also use high base-drive currents under large loads. The MAX8882/MAX8883 do not suffer from these problems and only consume 165µA of quiescent current whether in dropout, light-load, or heavy-load applications (see the Typical Operating Characteristics). While a PNP-based regulator has dropout voltage that is independent of the load, a Pchannel MOSFET’s dropout voltage is proportional to load current, providing for low dropout voltage at heavy loads and extremely low dropout voltage at lighter loads. perature exceeds TJ = +160°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor will turn the pass transistor on again after the IC’s junction temperature cools by 10°C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection is designed to protect the MAX8882/MAX8883 in the event of fault conditions. For continual operation, do not exceed the absolute maximum junction-temperature rating of TJ = +150°C. Operating Region and Power Dissipation The MAX8882/MAX8883’s maximum power dissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipation across the device is P = IOUT (VIN VOUT) (Figure 1). The maximum power dissipation is: PMAX = (TJ - TA) / (TJB + TBA) where TJ - TA is the temperature difference between the MAX8882/MAX8883 die junction and the surrounding air, TJB (or TJC) is the thermal resistance of the package, and TBA is the thermal resistance through the printed circuit board, copper traces, and other materials to the surrounding air. The GND pin of the MAX8882/MAX8883 performs the dual functions of providing an electrical connection to the ground and channeling heat away. Connect the GND pin to ground using a large pad or ground plane. SAFE OPERATING REGION 180 +70°C 160 140 120 +85°C 100 80 60 Current Limit 40 The MAX8882/MAX8883 contain two independent current limiters, one for each regulator, which monitor and control the pass transistor’s gate voltage, limiting the guaranteed maximum output current to 160mA minimum. The output can be shorted to ground for an indefinite time without damaging the part. 20 0 0 1 2 3 4 5 VIN - VOUT_ (V) Figure 1. MAX8882/MAX8883 Safe Operating Region Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the MAX8882/MAX8883. When the junction tem6 MAX8882/3 fig01 Detailed Description IOUT_ (mA) MAX8882/MAX8883 Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 _______________________________________________________________________________________ Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 Applications Information Capacitor Selection and Regulator Stability Use a 2.2µF capacitor on the MAX8882/MAX8883 input and a 2.2µF capacitor on the outputs. Larger input capacitor values and lower ESRs provide better supplynoise rejection and line-transient response. To reduce noise, improve load transients, and for loads up to 160mA, use larger output capacitors (up to 10µF). For stable operation over the full temperature range and with load currents up to 80mA, use 2.2µF. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use 4.7µF or more to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 2.2µF is sufficient at all operating temperatures. These regulators are optimized for ceramic capacitors, and tantalum capacitors are not recommended. Use a 0.01µF bypass capacitor at BP (MAX8882) for low output voltage noise. Increasing the capacitance will slightly decrease the output noise, but increase the startup time. (See the Shutdown Response graph in the Typical Operating Characteristics.) PSRR and Operation from Sources Other than Batteries The MAX8882/MAX8883 are designed to deliver low dropout voltages and low quiescent currents in batterypowered systems. Power-supply rejection is 62dB at low frequencies and rolls off above 100kHz. (See the PSRR vs. Frequency graph in the Typical Operating Characteristics.) When operating from sources other than batteries, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. Dropout Voltage A regulator’s minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX8882/MAX8883 use a P-channel MOSFET pass transistor, their dropout voltage is a function of drain-tosource on-resistance (RDS(ON)) multiplied by the load current (see the Typical Operating Characteristics). Chip Information TRANSISTOR COUNT: 493 PROCESS: BiCMOS Pin Configurations (continued) TOP VIEW OUTB 1 GND 2 MAX8883 SHDNA 3 6 OUTA 5 IN 4 SHDNB SOT23-6 _______________________________________________________________________________________ 7 MAX8882/MAX8883 Low-Noise Operation (MAX8882) An external 0.01µF bypass capacitor at BP, in conjunction with an internal resistor, creates a lowpass filter. The MAX8882 exhibits 40µVRMS of output voltage noise with CBP = 0.01µF and COUT_ = 4.7µF. (See the Output Noise Spectral Density graph in the Typical Operating Characteristics.) Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 6LSOT.EPS MAX8882/MAX8883 Package Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.