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MAX8883EUTA5-MAX8883EUTAQ
Dual / Low-Noise / Low-Dropout / 160mA Linear Regulators in SOT23
General DescriptionThe 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 P-
channel 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 refer-
ence 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.
________________________ApplicationsµP/DSP Core/IO Power
Cellular and PCS Telephones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
Hand-Held Instruments
FeaturesTwo LDOs in Tiny SOT23Up to 160mA Output Current (each LDO)40µVRMSOutput Noise (MAX8882)72mV Dropout at 80mA LoadLow 165µA Operating Supply Current62dB PSRR (greater than 56dB to 100kHz)Independent Low-Power Shutdown Controls
(MAX8883)Thermal-Overload and Short-Circuit ProtectionOutput Current Limit
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
Pin Configurations19-1818; Rev 1; 10/01
Ordering Informationypical Operating Circuit
Selector Guide100mV increments. Contact factory for other versions.
Minimum order quantity is 50,000 units.
*See Selector Guide
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
ABSOLUTE MAXIMUM RATINGS
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)
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.
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
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8882/3 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY CURRENT
vs. LOAD CURRENT
MAX8882/3 toc02
LOAD CURRENT (mA)
SUPPLY CURRENT (
SUPPLY CURRENT
vs. TEMPERATURE
MAX8882/3 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8882/3 toc04
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
DROPOUT vs. VOUT
MAX8882/83 toc05
VOUT (V)
DROPOUT (mV)
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
MAX8882/83 toc06
TEMPERATURE (°C)
OUTPUT VOLTAGE (%)
Typical Operating Characteristics(VOUT_ = 2.85V, IOUT_ = 80mA, VIN= +3.6V, COUT_ = 2.2µF, CBP= 0.01µF, and CIN= 2.2µF, unless otherwise noted.)
Note 2:The dropout voltage is defined as VIN- VOUTwhen VIN= VOUT(NOM). Specification only applies when VOUT≥2.5V.
Note 3:See the Typical Operating Characteristicsfor guaranteed specifications at voltages other than 3.3V.
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
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.)
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
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.)
MAX8882/MAX8883
Detailed DescriptionThe MAX8882/MAX8883 are low-noise, low-dropout,
low-quiescent-current linear regulators designed primar-
ily 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
MAX8882The MAX8882 has a single shutdown control input
(SHDN). Drive SHDNlow to shut down both outputs,
reducing supply current to 10nA. Connect SHDNto a
logic-high, or IN, for normal operation.
MAX8883The MAX8883 has independent shutdown control
inputs (SHDNAand SHDNB). Drive SHDNAlow to shut
down OUTA. Drive SHDNBlow to shut down OUTB.
Drive both SHDNAand SHDNBlow to shut down the
entire chip, reducing supply current to 10nA. Connect
both SHDNAand SHDNBto a logic-high, or IN, for nor-
mal operation.
Internal P-Channel Pass TransistorThe MAX8882/MAX8883 feature two 1ΩP-channel
MOSFET pass transistors. A P-channel MOSFET pro-
vides several advantages over similar designs using
PNP pass transistors, including longer battery life. It
requires no base drive, which reduces quiescent cur-
rent significantly. PNP-based regulators waste consid-
erable current in dropout when the pass transistor
saturates, and they also use high base-drive currents
under large loads. The MAX8882/MAX8883 do not suf-
fer 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 P-
channel 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.
Current LimitThe MAX8882/MAX8883 contain two independent cur-
rent limiters, one for each regulator, which monitor and
control the pass transistor’s gate voltage, limiting the
guaranteed maximum output current to 160mA mini-
mum. The output can be shorted to ground for an indef-
inite time without damaging the part.
Thermal-Overload ProtectionThermal-overload protection limits total power dissipa-
tion in the MAX8882/MAX8883. When the junction tem-
perature exceeds TJ= +160°C, the thermal sensor sig-
nals 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 tem-
perature 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 maxi-
mum junction-temperature rating of TJ= +150°C.
Operating Region and Power DissipationThe MAX8882/MAX8883’s maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit 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- TAis the temperature difference between
the MAX8882/MAX8883 die junction and the surround-
ing air, TJB(or TJC) is the thermal resistance of the
package, and TBAis the thermal resistance through the
printed circuit board, copper traces, and other materi-
als 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.
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23Figure 1. MAX8882/MAX8883 Safe Operating Region
