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19-1818; Rev 1; 10/01
Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23
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 165A 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. o o o o o o o
Features
Two LDOs in Tiny SOT23 Up to 160mA Output Current (each LDO) 40VRMS Output Noise (MAX8882) 72mV Dropout at 80mA Load Low 165A Operating Supply Current 62dB PSRR (greater than 56dB to 100kHz) Independent Low-Power Shutdown Controls (MAX8883) o Thermal-Overload and Short-Circuit Protection o Output Current Limit
MAX8882/MAX8883
Selector Guide
PART MAX8882EUTJJ MAX8882EUTAQ MAX8882EUTA5 MAX8882EUTQ5 MAX8882EUTGG MAX8883EUTJJ MAX8883EUTAQ MAX8883EUTA5 MAX8883EUTQ5 MAX8883EUTGG VOUTA 2.85 3.3 3.3 2.5 3.0 2.85 3.3 3.3 2.5 3.0 VOUTB 2.85 2.5 1.8 1.8 3.0 2.85 2.5 1.8 1.8 3.0 TOP MARK AANR AAPW AARY AAPX AAZT AANS AAPY AARZ AAPZ AAZU
________________________Applications
P/DSP Core/IO Power Cellular and PCS Telephones PDAs and Palmtop Computers Notebook Computers Digital Cameras Hand-Held Instruments
Pin Configurations
TOP VIEW
***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
PART
OUTB 1 6 OUTA
SHUTDOWN Single Dual
TEMP RANGE -40C to +85C -40C to +85C
PINPACKAGE 6 SOT23-6 6 SOT23-6
MAX8882EUT_ _*
GND 2
MAX8882
5
IN
MAX8883EUT_ _*
*See Selector Guide
BP 3 4 SHDN
Typical Operating Circuit
OUTA VIN 2.5V to 6.5V 2.2F MAX8882 MAX8883 OUTB SHDN_ IN 2.2F 2.2F GND ( ) ARE FOR MAX8882 ONLY. (BP) 0.01F VOUTA FIXED (1.8V to 3.3V) VOUTB FIXED (1.8V to 3.3V)
SOT23-6
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 MAX8882/MAX8883
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 = +70C) 6-Pin SOT23 (derate 8.7mW/C above +70C)............695mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Voltage Undervoltage Lockout Threshold Output Voltage Accuracy Maximum Output Current Current Limit Ground Current Shutdown Supply Current SHDN_ Input Threshold SHDN_ Input Bias Current Dropout Voltage (Notes 2, 3) Line Regulation No Load, VIN = 6.5V IOUT_ = 80mA, both LDOs SHDN_ = GND, TA = +25C SHDN_ = GND VIH VIL SHDN_ = GND or IN, TA = +25C SHDN_ = GND or IN IOUT_ = 1mA IOUT_ = 40mA IOUT_ = 80mA VIN = (VOUT_ + 0.4V or 2.5V) to + 6.5V, IOUT_ = 1mA 10Hz to 100kHz, CBP = 0.01F, COUT_ = 4.7F, IOUT_ = 1mA 10Hz to 100kHz, COUT_ = 4.7F, IOUT_ = 10mA MAX8882 MAX8883 -0.2 0 0.05 1 36 72 0 40 320 144 0.2 %/V mV 1.6 0.4 100 VIN_ rising, hysteresis 40mV typical TA = +25C, IOUT_ = 1mA IOUT_ = 1mA IOUT_ = 100A to 160mA Continuous CONDITIONS MIN 2.5 2.15 -1 -2 -3 160 160 165 170 0.01 0.1 1 550 265 2.25 TYP MAX 6.5 2.40 1 2 2 mA mA A A V nA % UNITS V V
Output Voltage Noise
VRMS
2
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Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3.6V, SHDN = SHDNA = SHDNB = IN, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Output Voltage AC PSRR 100Hz, COUT_ = 4.7F Thermal Shutdown Temperature Thermal Shutdown Hysteresis MAX8883 60 160 10 C C CONDITIONS 100Hz, CBP = 0.01F, COUT_ = 4.7F MAX8882 MIN TYP 62 dB MAX UNITS
MAX8882/MAX8883
Note 1: All units are 100% production tested at TA = +25C. 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_ = 2.2F, CBP = 0.01F, and CIN = 2.2F, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX8882/3 toc01
SUPPLY CURRENT vs. LOAD CURRENT
MAX8882/3 toc02
SUPPLY CURRENT vs. TEMPERATURE
180 160 SUPPLY CURRENT (A) 140 120 100 80 60 40 20 0 80mA LOAD, BOTH OUTPUTS
MAX8882/3 toc03
250 80mA LOAD, BOTH OUTPUTS
200 180 160 SUPPLY CURRENT (A) 140 120 100 80 60 40 20 BOTH OUTPUTS LOADED
200
200 SUPPLY CURRENT (A)
150 NO LOAD 100
50
0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V)
0 0 10 20 30 40 50 60 70 80 LOAD CURRENT (mA)
-40
-15
10
35
60
85
TEMPERATURE (C)
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8882/3 toc04
DROPOUT vs. VOUT
MAX8882/83 toc05
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE
0.8 0.6 OUTPUT VOLTAGE (%) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
MAX8882/83 toc06
90 75 DROPOUT VOLTAGE (mV) 60 45 30 15 0 0 10 20 30 40 50 60 70 TA = -40C TA = +25C TA = +85C
200 180 160 140 DROPOUT (mV) 120 100 80 60 40 20 0 MEAN GUARANTEED MAXIMUM
1.0
80
2.5
2.7
2.9 VOUT (V)
3.1
3.3
-40
-25
-10
5
20
35
50
65
80
LOAD CURRENT (mA)
TEMPERATURE (C)
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Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 MAX8882/MAX8883
Typical Operating Characteristics (continued)
(VOUT_ = 2.85V, IOUT_ = 80mA, VIN = +3.6V, COUT_ = 2.2F, CBP = 0.01F, and CIN = 2.2F, unless otherwise noted.)
CHANNEL-TO-CHANNEL ISOLATION vs. FREQUENCY
MAX8882/3 toc07
PSRR vs. FREQUENCY
70 60 50 PSRR (dB) 40 30 20 10 0 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) CHANNEL-TO-CHANNEL ISOLATION (dB) 100 LOAD 120
100 LOAD 100 80 60 40 20 0 0.01 0.1 1 10 100 THERMAL COUPLING CAPACITVE COUPLING
1000
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY
MAX8882/3 toc09
MAX8882 OUTPUT NOISE (10Hz to 100kHz)
MAX8882/3 toc10
10000
NOISE DENSITY (nV/Hz)
1000 VOUT_ 500V/div (AC-COUPLED)
100
10 0.01
0.1
1
10
100
1000
1ms/div
LINE TRANSIENT
MAX8882/3 toc11
LOAD TRANSIENT (VIN = 3.35V, ILOAD = 0 TO 80mA)
4.5V 3.5V 1V/div VOUT_
MAX8882/3 toc12
VIN
VOUT_
20mV/div (AC-COUPLED)
ILOAD 0
50s/div
10s/div
4
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MAX8882/3 toc08
20mV/div (AC-COUPLED)
50mA/div
Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23
Typical Operating Characteristics (continued)
(VOUT_ = 2.85V, IOUT_ = 80mA, VIN = +3.6V, COUT_ = 2.2F, CBP = 0.01F, and CIN = 2.2F, unless otherwise noted.)
LOAD TRANSIENT NEAR DROPOUT
MAX8882/3 toc13
MAX8882/MAX8883
SHUTDOWN RESPONSE
MAX8882/3 toc14
RLOAD = 100 VOUT 20mV/div OUTPUT VOLTAGE 0 20V/div
VIN = VOUT + 0.1V ILOAD 50A/div 0 SHUTDOWN VOLTAGE 0 1ms/div 1V/div
10s/div
Pin Description
PIN MAX8882 1 MAX8883 1 NAME FUNCTION Regulator B Output. Sources up to 160mA continuous current. Bypass with a 2.2F (<0.5 typ ESR) 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 thermal dissipation. Reference Noise Bypass. Bypass with a low-leakage 0.01F ceramic capacitor for reduced noise at both outputs. 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. 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. 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. Regulator Input. Supply voltage can range from +2.5V to +6.5V. This input also supplies the on-chip reference. Bypass with 2.2F to GND (see the Capacitor Selection and Regulator Stability section). Regulator A Output. Sources up to 160mA continuous current. Bypass with a 2.2F (<0.5 typ ESR) capacitor to GND (see the Capacitor Selection and Regulator Stability section).
OUTB
2 3
2 --
GND BP
--
3
SHDNA
--
4
SHDNB
4
--
SHDN
5
5
IN
6
6
OUTA
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Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 MAX8882/MAX8883
Detailed Description
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. perature exceeds TJ = +160C, 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 10C, 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 = +150C.
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.
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.
Internal P-Channel Pass Transistor
The MAX8882/MAX8883 feature two 1 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 165A 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.
SAFE OPERATING REGION
160 140 120 IOUT_ (mA) 100 80 60 40 20 0 0 1 2 3 4 5 VIN - VOUT_ (V) +85C +70C
MAX8882/3 fig01
180
Current Limit
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.
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 _______________________________________________________________________________________
Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23
Low-Noise Operation (MAX8882)
An external 0.01F bypass capacitor at BP, in conjunction with an internal resistor, creates a lowpass filter. The MAX8882 exhibits 40VRMS of output voltage noise with CBP = 0.01F and COUT_ = 4.7F. (See the Output Noise Spectral Density 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.
MAX8882/MAX8883
Applications Information
Capacitor Selection and Regulator Stability
Use a 2.2F capacitor on the MAX8882/MAX8883 input and a 2.2F 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 10F). For stable operation over the full temperature range and with load currents up to 80mA, use 2.2F. 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 4.7F or more to ensure stability at temperatures below -10C. With X7R or X5R dielectrics, 2.2F is sufficient at all operating temperatures. These regulators are optimized for ceramic capacitors, and tantalum capacitors are not recommended. Use a 0.01F 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.)
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 6 OUTA
GND 2
MAX8883
5
IN
SHDNA 3
4
SHDNB
SOT23-6
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7
Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23 MAX8882/MAX8883
Package Information
6LSOT.EPS
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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