MAX1614EUA ,High-Side / N-Channel MOSFET Switch Driverfeatures a 1.5%-accurate low-batterycomparator that can be used to indicate a low-battery' Space-Sa ..
MAX1614EUA+ ,High-Side, n-Channel MOSFET Switch DriverElectrical Characteristics(V = 15V, T = 0°C to +85°C, unless otherwise noted. Typical values are at ..
MAX1614EUA+T ,High-Side, n-Channel MOSFET Switch DriverApplicationsPART TEMP RANGE PIN-PACKAGE● Notebook ComputersMAX1614C/D 0°C to +70°C Dice*● Portable ..
MAX1614EUA-T ,High-Side, n-Channel MOSFET Switch Driverfeatures a 1.5%-accurate low-battery ● Low Power Consumption Extends Battery Life comparator that c ..
MAX1615EUK ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersELECTRICAL CHARACTERISTICS(V = 15V, SHDN = V , I = 5μA, T = T to T , unless otherwise noted. Typica ..
MAX1615EUK ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersELECTRICAL CHARACTERISTICS(V = 15V, SHDN = V , I = 5μA, T = T to T , unless otherwise noted. Typica ..
MAX4322EUK-T ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsELECTRICAL CHARACTERISTICS—T = +25°C A(V = +5.0V, V = 0, V = 0, V = V / 2, SHDN = V R tied to V / 2 ..
MAX4322EUK-T ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsMAX4322/MAX4323/MAX4326/MAX4327/MAX432919-1380; Rev 2a; 12/99Single/Dual/Quad, Low-Cost, SOT23,Low- ..
MAX4323EBT-T ,Single/Dual/Quad, Low-Cost, UCSP/SOT23, Low-Power, Rail-to-Rail I/O Op AmpsGeneral Description ________
MAX4323ESA ,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 ..
MAX4323ESA+ ,Single/Dual/Quad, Low-Cost, UCSP/SOT23, Low-Power, Rail-to-Rail I/O Op AmpsMAX4322/MAX4323/MAX4326/MAX4327/MAX432919-1380; Rev 3; 10/02Single/Dual/Quad, Low-Cost, UCSP/SOT23, ..
MAX4323EUA ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsGeneral Description ________
MAX1614EUA
High-Side / N-Channel MOSFET Switch Driver
_______________General DescriptionThe MAX1614 drives high-side, N-channel power MOSFETs
to provide battery power-switching functions in portable
equipment. N-channel power MOSFETs typically have
one-third the on-resistance of P-channel MOSFETs of simi-
lar size and cost. An internal micropower regulator and
charge pump generate the high-side drive output voltage,
while requiring no external components.
The MAX1614 also features a 1.5%-accurate low-battery
comparator that can be used to indicate a low-battery
condition, provide an early power-fail warning to the sys-
tem microprocessor, or disconnect the battery from the
load, preventing deep discharge and battery damage. An
internal latch allows for pushbutton on/off control with very
low current consumption. Off-mode current consumption
is only 6µA while normal operation requires less than
25µA. The MAX1614 is available in the space-saving
µMAX package that occupies about 60% less space than
a standard 8-pin SO.
________________________ApplicationsNotebook Computers
Portable Equipment
Hand-Held Instruments
Battery Packs
____________________________FeaturesInternal On/Off LatchHigh-Side, N-Channel Power MOSFET Drive25µA (max) Quiescent Current6µA (max) Off CurrentRequires No External Components 1.5%-Accurate Low-Battery DetectorSpace-Saving µMAX Package5V to 26V Input Voltage RangeDrives Single or Back-to-Back MOSFETsControlled Turn-On for Low Inrush Current
MAX1614
High-Side, N-Channel MOSFET
Switch Driver
__________________Pin Configuration
__________Typical Operating Circuit19-1176; Rev 0; 12/96
MAX1614
High-Side, N-Channel MOSFET
Switch Driver
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VBATT= 15V, TA
= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°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.
BATT, SRC to GND.................................................-0.3V to +30V
GATE to SRC..........................................................-0.3V to +12V
GATE to GND.........................................................-0.3V to +36V
GATE + SRC Sink Current, Continuous.............................2.7mA
LBI, LBO, ON, OFFto GND....................................-0.3V to +12VLBOCurrent..........................................................................5mA
Continuous Power Dissipation (TA= +70°C)
µMAX (derate 4.10mV/°C above +70°C).....................330mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX1614
High-Side, N-Channel MOSFET
Switch Driver
ELECTRICAL CHARACTERISTICS(VBATT= 15V, TA
= -40°C to +85°C,unless otherwise noted.) (Note 1)
__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
ON SUPPLY CURRENT
vs. VBATT
MAX1614-01
VBATT (V)
SUPPLY CURRENT (15
OFF SUPPLY CURRENT
vs. VBATT
MAX1614-02
VBATT (V)
SHUTDOWN CURRENT (
Note 1:Specifications to -40°C are guaranteed by design and not production tested.
LOW-BATTERY THRESHOLD
vs. TEMPERATURE
MAX1614-05
TEMPERATURE (°C)
LBI THRESHOLD (V)
1.282060
MAX1614
High-Side, N-Channel MOSFET
Switch Driver
____________________________Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
GATE-DISCHARGE CURRENT
vs. GATE VOLTAGE
MAX1614-04
VGATE (V)
GATE-DISCHARGE CURRENT (mA)
GATE-CHARGING CURRENT
vs. BATT VOLTAGE
MAX1614-06
VBATT (V)
GATE-CHARGING CURRENT (15
GATE-CHARGING CURRENT
vs. TEMPERATURE
MAX1614--03
TEMPERATURE (°C)
GATE-CHARGING CURRENT (-206020
MAX1614
High-Side, N-Channel MOSFET
Switch Driver
_______________Detailed DescriptionThe MAX1614 uses an internal, monolithic charge pump
and low-dropout linear regulator to supply the required
8V VGSvoltage to fully enhance an N-channel MOSFET
high-side switch (Figure 1). The charge pump typically
supplies 30µA, charging 800pF of gate capacitance in
400µs (VBATT= 15V). For slower turn-on times, simply
add a small capacitor between the GATE and SRC
pins. When turned off, GATE and SRC pull low and typi-
cally discharge an 800pF gate capacitance in 80µs.
The MAX1614 provides separate on/off control inputs
(ONand OFF). ONand OFFconnect, respectively, to
the SETand RESETinputs of an internal flip-flop. Whenis pulsed low (with OFF= high), the internal charge
pump turns on, and GATE is pumped to 8V above SRC,
turning on the external MOSFETs. The charge pump
maintains gate drive to the external MOSFETs until OFF
is pulsed low. When this happens, the internal charge
pump turns off, and GATE discharges to ground
through an internal switch. For slower turn-on times,
simply add a small capacitor.
__________Applications Information
Connecting ON/OFFto 3V or 5V Logicand OFFinternally connect to 2µA max pull-up
current sources (Figure 1). The open-circuit voltage
for ONand OFFranges from 7V to 10.5V (nominally
8.5V). Since the current sources are relatively weak,
connecting ONand OFFdirectly to logic powered from
lower voltages (e.g., 3V or 5V) poses no problem if the
gate outputs driving these pins can sink at least 2µA
while high.
Although the MAX1614 shutdown function was designed
to operate with a single pushbutton on/off switch, it can
also be driven by a single gate. Connect ONto GND
and drive OFFdirectly (Figure 2).
Maximum Switching RateThe MAX1614 is not intended for fast switching appli-
cations. In fact, it is specifically designed to limit the
rate of change of the load current, DI/Dt. The maximum
switching rate is limited by the turn-on time, which is a
function of the charge-pump output current and the
total capacitance on GATE (CGATE). Calculate the turn-
on time as a function of external MOSFET gate capaci-
tance using the Gate Charging Current vs. VBATTgraph
in the Typical Operating Characteristics. Since turn-off
time is small compared to turn-on time, the maximum
switching rate is approximately 1/tON.
Adding Gate CapacitanceThe charge pump uses an internal monolithic transfer
capacitor to charge the external MOSFET gates.
Normally, the external MOSFET’s gate capacitance is
sufficient to serve as a reservoir capacitor. If the
MOSFETs are located at a significant distance from the
MAX1614, place a local bypass capacitor (100pF typ)
across the GATE and SRC pins. For slower turn-on
times, simply add a small capacitor between GATE and
SRC.
______________________________________________________________Pin Description
MAX1614
High-Side, N-Channel MOSFET
Switch DriverFigure 1. Functional Diagram
