MAX1615EUK-T ,High-Voltage / Low-Power Linear Regulators for Notebook Computersfeatures include wide' <1µA Shutdown Supply Currentinput voltage range, low dropout voltage, and lo ..
MAX1616EUK ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersMAX1615/MAX161619-1225; Rev 3; 9/04High-Voltage, Low -Pow er Linear Regulatorsfor Notebook Computer ..
MAX1616EUK/T ,High-Voltage / Low-Power Linear Regulators for Notebook ComputersApplications _______________Ordering InformationCMOS/RTC Backup PowerPIN- SOTPART TEMP. RANGEMicroc ..
MAX1616EUK+ ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersELECTRICAL CHARACTERISTICS (continued)(V = 15V, SHDN = V , I = 5μA, T = T to T , unless otherwise n ..
MAX1616EUK+T ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersFeaturesThe MAX1615/MAX1616 are micropower, SOT23-5 lin-♦ 4V to 28V Input Rangeear regulators that ..
MAX1616EUK-T ,High-Voltage / Low-Power Linear Regulators for Notebook ComputersELECTRICAL CHARACTERISTICS(V = 15V, SHDN = V , I = 5µA, T = T to T , unless otherwise noted. Typica ..
MAX4326EUA ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsFeaturesThe MAX4322/MAX4323/MAX4326/MAX4327/MAX4329 SOT23 Packages (MAX4322/MAX4323)family of oper ..
MAX4326EUA ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsApplicationsTypical Operating CircuitBattery-Powered Instruments+5VPortable EquipmentData-Acquisiti ..
MAX4326EUA ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsFeaturesThe MAX4322/MAX4323/MAX4326/MAX4327/MAX4329 SOT23 Packages (MAX4322/MAX4323)family of oper ..
MAX4326EUA+ ,Single/Dual/Quad, Low-Cost, UCSP/SOT23, Low-Power, Rail-to-Rail I/O Op AmpsFeaturesThe MAX4322/MAX4323/MAX4326/MAX4327/MAX4329♦ 6-Bump UCSP Package (MAX4323)family of operati ..
MAX4326EUA-T ,Single/Dual/Quad, Low-Cost, UCSP/SOT23, Low-Power, Rail-to-Rail I/O Op AmpsApplicationsV3 SHDN CCUCSPRail-to-Rail is a registered trademark of Nippon Motorola, Ltd.Pin Config ..
MAX4327ESD ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsELECTRICAL CHARACTERISTICS—T = +25°C (continued)A(V = +5V, V = 0, V = 0, V = V / 2, SHDN = V R tied ..
MAX1615EUK-T-MAX1616EUK/T-MAX1616EUK-T
High-Voltage / Low-Power Linear Regulators for Notebook Computers
________________General DescriptionThe MAX1615/MAX1616 are micropower, SOT23-5 lin-
ear regulators that supply always-on, keep-alive power
to CMOS RAM and microcontrollers (µCs) in systems
with high-voltage batteries. Key features include wide
input voltage range, low dropout voltage, and low qui-
escent supply current.
Despite a miserly 8µA (max) no-load supply current, the
MAX1615/MAX1616 have excellent line-transient
response and AC power-supply rejection ratio. They
provide a clean, fixed 5V or 3.3V output (MAX1615) or
an adjustable 1.24V to 28V output (MAX1616), even
when subjected to fast supply-voltage changes that
occur during the switchover from battery to AC adapter
input power. The space-saving SOT23-5 package has
excellent thermal characteristics and tolerates up to
571mW of power dissipation. Fault protection is provid-
ed by internal foldback current limiting and thermal-
shutdown circuitry.
________________________ApplicationsCMOS/RTC Backup Power
Microcontroller Power
Notebook Computers
Smart-Battery Packs
PDAs and Handy-Terminals
Battery-Powered Systems
____________________________Features4V to 28V Input Range8µA (max) Quiescent Supply Current<1µA Shutdown Supply Current3.3V or 5V, Pin-Selectable Output (MAX1615)
Adjustable 1.24V to 28V Output (MAX1616)30mA Output Current ±2% Initial Output AccuracyThermal-Overload Protection5-Pin SOT23 PackageLow Cost
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
___________________Pin Configuration
____________Typical Operating Circuit19-1225; Rev 2; 1/98
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 15V, SHDN= VIN, ILOAD= 5µA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
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 to GND.................................................................-0.3V to 30V
Terminal Voltages to GND
SHDNto GND...........................................-0.3V to (VIN+ 0.3V)
5/3to GND ............................................-0.3V to (VOUT+ 0.3V)
FB (MAX1616) to GND .........................-0.3V to (VOUT+ 0.3V)
OUT to GND...........................................................-0.3V to 30V
OUT Short-Circuit to GND...............................................30sec
Continuous OUT Current.....................................................40mA
Continuous Power Dissipation (TA= +70°C) (Note 1)
SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW
Operating Temperature Range
MAX161_EUK-T ...............................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Note 1:See Operating Region and Power Dissipationsection.
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(VIN= 15V, SHDN= VIN, ILOAD= 5µA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
Note 2:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed through
correlation using standard quality-control (SQC) methods.
Note 3:Pulse tested at VIN= 28V, ILOAD= 30mA to avoid exceeding package power-dissipation limits.
Note 4:Guaranteed by design. Tested with VOUTset to 5V. Dropout voltage is tested by reducing the input voltage until VOUTdrops
to 100mV below its nominal value, measured with VINstarting 2V above VOUT.
Note 5:Use at least 1µF minimum for light loads. Add 0.125µF/mA (0.2µF/mA for the MAX1616) for loads greater than 100µA,
not production tested. See Capacitor Selectionin the Applications Informationsection.
__________________________________________Typical Operating Characteristics(VOUTset to 5V, TA = +25°C, unless otherwise noted.)
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
____________________________Typical Operating Characteristics (continued)(VOUTset to 5V, TA = +25°C, unless otherwise noted.)
_______________Detailed DescriptionThe MAX1615/MAX1616 low-quiescent-current linear
regulators are designed primarily for high input voltage
applications. The MAX1615 supplies a preselected 3.3V
or 5.0V output for loads up to 30mA. The MAX1616
provides an adjustable voltage from 1.24V to 28V. The
maximum output current is a function of the package’s
maximum power dissipation for a given temperature. A
5µA load is required to maintain output regulation.
The MAX1615’s output voltage is fed back through an
internal resistor voltage divider connected to OUT. Set
the output voltage to either 3.3V or 5.0V with the 5/3pin.
Select the 5V output by connecting 5/3to OUT, or the
3.3V output by connecting 5/3to GND.
The MAX1616 uses external feedback, allowing the out-
put voltage to be set by external resistors (see Setting
the MAX1616 Output Voltage section). The typical FB
threshold is at 1.24V.
ShutdownThe device enters shutdown mode when SHDNis low.
In shutdown mode, the pass transistor, control circuit,
reference, and all biases turn off, reducing the supply
current to below 1µA. Connect SHDNto IN for automatic
start-up.
Current LimitOutput current is limited to 100mA (typical). The current
limit exceeds the 30mA (max) safe operating limit. The
output can be shorted to ground for 30 seconds without
damaging the part.
Thermal-Overload ProtectionWhen the junction temperature exceeds TJ= +150°C,
the thermal sensor sends a signal to the shutdown
logic, turning off the pass transistor and allowing the IC
to cool. The thermal sensor turns the pass transistor on
again after the IC’s junction temperature cools by
+20°C (typical), resulting in a pulsating output during
continuous thermal-overload conditions.
Operating Region and Power DissipationMaximum power dissipation depends on the thermal
resistance of the case and circuit board, the tempera-
ture difference between the die junction and ambient
air, and the rate of air flow. The device’s power dissipa-
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
______________________________________________________________Pin Description
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
___________________Chip InformationTRANSISTOR COUNT: 386
tion is P = IOUT(VIN- VOUT). The power dissipation at
+70°C ambient is 571mW (see Absolute Maximum
Ratings). The thermal resistance junction-to-case of the
SOT23-5 package is 81°C/W, and the maximum safe
junction temperature is +150°C.
The GND pin performs the dual function of providing an
electrical connection to ground and channeling heat
away. Connect GND to ground using a large pad or
ground plane.
__________Applications Information
Setting the MAX1616 Output VoltageSet the MAX1616’s output voltage with two resistors, R1
and R2 (Figure 2). Choose R2 = 250kΩto maintain a
5µA minimum load and calculate R1 using the following
equation:
where VFBT= 1.24V (typical).
Capacitor Selection Use a 0.1µF minimum capacitor on the input. Higher
values will improve line-transient response.
Use 1µF minimum on the output, or 4.7µF for the full
30mA load current (6.8µF, MAX1616). Otherwise, use
1µF plus 0.125µF/mA (0.2µF/µA, MAX1616). For output
voltages less than 3.3V, use 15µF instead of 6.8µF. The
output capacitor’s effective series resistance (ESR) must
be less than 1Ωfor stable operation.
Output Voltage Noise The MAX1615/MAX1616 typically exhibit 5mVp-p of
noise during normal operation. This is negligible in
most applications. In applications that include analog-
to-digital converters (ADCs) of more than 12 bits, con-
sider the ADC’s power-supply-rejection specifications.
Transient Response The Typical Operating Characteristicsshow the
MAX1615/MAX1616’s load-transient response. Two of
the output response’s components can be observed on
the load-transient graph: a DC shift from the output
impedance due to the different load currents, and the
transient response. Typical step changes in the load
current from 10mA to 20mA produce 50mV transients.
Increasing the output capacitor’s value attenuates tran-
sient spikes.
