MAX1807EUB-MAX1807EUB+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1807EUB+ ,Micropower Adjustable Overvoltage Protection ControllersApplicationsNotebook ComputersPART TEMP. RANGE PIN-PACKAGEPower-Supply ModulesMAX1807EUB -40°C to ..
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MAX1807EUB-MAX1807EUB+
Micropower Adjustable Overvoltage Protection Controllers
General Description
The MAX1807/MAX1808 monitor up to five supply rails
for an overvoltage condition and provide a latched out-
put when any one of the five supplies exceeds the trip
thresholds. The latched output drives an external P-
channel load switch to remove power when an over-
voltage condition is detected. The latch is reset when a
logic low is input to ON or the power supply is cycled.
The MAX1807 provides a 28V open-drain fault output
that can be used to trigger an alert, trip a resetable
fuse, or for other purposes. The MAX1808 includes a
low-battery comparator with hysteresis to drive the DP
output high, turning off the external P-channel switch
when the input voltage is too low.
The MAX1807/MAX1808 are available in a miniature 10-
pin µMAX package.
________________________Applications
Notebook Computers
Power-Supply Modules
Multi-Output Power Supplies
FeaturesFive 3% Accurate Overvoltage ComparatorsSeries PFET Gate Driver with VGS Limiter 21µA Quiescent Supply Current4µA Shutdown Current4.4V to 28V Operating Voltage Range3% Accurate Comparator with 10% Hysteresis for
Low-Battery Detection (MAX1808)28V Open-Drain N-Channel Output (MAX1807)Small 10-Pin µMAX Package
MAX1807/MAX1808
Micropower Adjustable Overvoltage
Protection Controllers
19-1791; Rev 0; 10/00
Ordering InformationPART TEMP. RANGE PIN-PACKAGE
MAX1807EUB-40°C to +85°C10 µMAX
MAX1808EUB-40°C to +85°C10 µMAX
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
MAX1807
MAX1808
FAULT
(MAX1807)
GND
VDD
(MAX1808)
1V REFREF OK
IN1
IN2
IN3
IN4
IN5
PMOS
POWER
DRIVER
POWER-ON
RESET
(60μs)
2.5V
INTERNAL
SUPPLY_____
Functional Diagram
MAX1807/MAX1808
Micropower Adjustable Overvoltage
Protection Controllers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= VON= 15V, VIN1–VIN5= 0.5V, VTH= 2.0V, CDP= 5nF, FAULT= open, TA= 0°C to +85°C, unless otherwise noted.)
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.
IN1_, TH to GND.......................................................-0.3V to +6V
ON, VDD,FAULTto GND........................................-0.3V to +30V
DP to GND..................................................-0.3V to (VDD+ 0.3V)
Continuous Power Dissipation
10-Pin µMAX (derate 5.6mW/°C above +70°C)...........448mW
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GENERAL
VDD Input Voltage RangeDP and FAULT in correct state (Table 1)228V
VDD Operating Voltage Range4.428V
VDD Undervoltage Lockout
Threshold
Ri si ng tr i p l evel , typ ical 2% hyster esi s; w hen V D D s b el ow thi s l evel , D P = H i and FAU LT = H i - Z 22.74.0V
Supply CurrentVTH = 2V or 0.5V2145μA
Shutdown CurrentV D D = 15V , V ON = GN D , V IN 1–V IN 5 = V TH = GN D 48.5μA
COMPARATORS (IN1–IN5, TH)
IN1–IN5 Input Trip LevelRising edge, typical 1% hysteresis,
VDD = 4.4V to 28V0.9711.03V
TH Input Trip Level, FallingVDD = 4.4V to 28V (MAX1808 only)0.9711.03V
TH Input Trip Level, RisingVDD = 4.4V to 28V (MAX1808 only)1.0451.11.155V
IN1–IN5 Propagation DelayIN1–IN5 rising, 10mV overdrive, VDD = 4.4V40μs
TH rising, 10mV overdrive, VDD = 4.4V
(MAX1808 only)11
TH Propagation DelayTH falling, 10mV overdrive, VDD = 4.4V
(MAX1808 only)40
IN1–IN5 Input Leakage CurrentVIN = 1.5V0.550nA
TH Input Leakage CurrentVTH = 1.5V (MAX1808 only)0.550nA
ON Input High Logic LevelVDD = 4.4V to 28V1.6V
ON Input Low Logic LevelVDD = 4.4V to 28V0.5V
VON = 5V0.031.2ON Input Leakage CurrentVON = 28V10μA
FAULT Output High Leakage
CurrentV FAULT = 28V (MAX1807 only)0.012μA
FAULT Output Low VoltageISINK = 4mA (MAX1807 only)0.4V
MAX1807/MAX1808
Micropower Adjustable Overvoltage
Protection Controllers
ELECTRICAL CHARACTERISTICS (continued)
(VDD= VON= 15V, VIN1–VIN5= 0.5V, VTH= 2.0V, CDP= 5nF, FAULT= open, TA= 0°C to +85°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
VDP = VDD - 0.4V150μADP Source Current
(PMOS Turn-Off)
VON = VDD,
VIN1 = 1.5VVDP = VDD - 2V520mAP S i nk C ur r ent ( P M O S Tur n- On) VDP = VDD - 5V450mA
DP Pullup Current (PMOS Off)VDP = VDD - 2V, VON = GND,
in shutdown state25μA
VDD = 8.5V to 28V7.59.511.5DP Turn-On Clamp Voltage
(VDD - VDP)
VON = VDD,
IDPSINK = 10μAVDD = 4.4V3.44.14.4V
ELECTRICAL CHARACTERISTICS
(VDD= VON= 15V, VIN1–VIN5= 0.5V, VTH= 2.0V, CDP= 5nF, FAULT= open, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GENERAL
VDD Input Voltage RangeDP and FAULT in correct state (Table 1)228V
VDD Operating Voltage Range4.428V
VDD Undervoltage Lockout
Threshold
Ri si ng tr i p l evel , typ i cal 2% hyster esi s; w henD D i s b el ow thi s l evel , D P = H i and FAU LT = i - Z 4.0V
Supply CurrentVTH = 2V or 0.5V45μA
Shutdown CurrentV D D = 15V , V ON = GN D , V IN 1–V IN 5 = V TH = GN D 8.5μA
COMPARATORS (IN1–IN5, TH)
IN1–IN5 Input Trip LevelRising edge, typical 1% hysteresis0.951.05V
TH Input Trip Level, FallingVDD = 4.4V to 28V (MAX1808 only)0.951.05V
TH Input Trip Level, RisingVDD = 4.4V to 28V (MAX1808 only)1.0451.155V
IN1–IN5 Input Leakage CurrentVIN = 1.5V50nA
TH Input Leakage CurrentVTH = 1.5V (MAX1808 only)50nA
ON Input High Logic LevelVDD = 4.4V to 28V1.8V
ON Input Low Logic LevelVDD = 4.4V to 28V0.4V
VON = 5V1.2ON Input Leakage CurrentVON = 28V10μA
FAULT Output High Leakage
CurrentV FAULT = 28V (MAX1807 only)2μA
FAULT Output Low VoltageISINK = 4mA (MAX1807 only)0.4V
VDP = VDD - 0.4V1μADP Source Current
(PMOS Turn-Off)
VON = VDD,
VIN1 = 1.5VVDP = VDD - 2V4mAP S i nk C ur r ent ( P M O S Tur n- On) VDP = VDD - 5V2mA
VDD = 8.5V to 28V7.511.5DP Turn-On Clamp Voltage
(VDD - VDP)
VON = VDD,
IDPSINK = 10μAVDD = 4.4V3.44.4V
Note 1:Specifications to -40°C are guaranteed by design, not production tested.
MAX1807/MAX1808
Micropower Adjustable Overvoltage
Protection Controllers
Typical Operating Characteristics
(Typical Operating Circuit, VDD= 15V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1807 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
TA = +85°C
TA = +25°CTA = -40°C
NORMALIZED IN_ TRIP THRESHOLD
ERROR vs. TEMPERATURE
MAX1807 toc05
TEMPERATURE (°C)
TRIP THRESHOLD ERROR (%)
4.4V
28V
15V
NORMALIZED TH TRIP THRESHOLD
ERROR vs. SUPPLY VOLTAGE (TH FALLING)
MAX1807 toc06
SUPPLY VOLTAGE (V)
TRIP THRESHOLD ERROR (%)
TA = +85°CTA = +25°C
TA = -40°C
NORMALIZED TH TRIP THRESHOLD
ERROR vs. SUPPLY VOLTAGE (TH RISING)
MAX1807 toc08
SUPPLY VOLTAGE (V)
TRIP THRESHOLD ERROR (%)TA = +85°C
TA = +25°C
TA = -40°C
NORMALIZED TH TRIP THRESHOLD
ERROR vs. TEMPERATURE (TH RISING)
MAX1807 toc09
TEMPERATURE (°C)
TRIP THRESHOLD ERROR (%)
4.4V
28V
NORMALIZED IN_ TRIP THRESHOLD
ERROR vs. SUPPLY VOLTAGE
MAX1807 toc04
SUPPLY VOLTAGE (V)
TRIP THRESHOLD ERROR (%)
TA = +85°C
TA = +25°C
TA = -40°C
NORMALIZED TH TRIP THRESHOLD
ERROR vs. TEMPERATURE (TH FALLING)
MAX1807 toc07
TEMPERATURE (°C)
TRIP THRESHOLD ERROR (%)
28V
4.4V
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1807 toc02
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (
TA = +85°C
TA = +25°C
TA = -40°C
FAULT OUTPUT VOLTAGE LOW
vs. FAULT OUTPUT SINK CURRENT
MAX1807 toc03
FAULT OUTPUT SINK CURRENT (mA)
OUTPUT VOLTAGE (mV)
TA = +85°C
TA = +25°C
TA = -40°C
MAX1807/MAX1808
Micropower Adjustable Overvoltage
Protection Controllers
Typical Operating Characteristics (continued)
(Typical Operating Circuit, VDD= 15V, TA = +25°C, unless otherwise noted.)
IN_ PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX1807 toc10
SUPPLY VOLTAGE (V)
PROPAGATION DELAY (
10mV
OVERDRIVE
TA = -40°C
TA = +85°C
TA = +25°C
DP SOURCE CURRENT
vs. (VDD - VDP) VOLTAGE
MAX1807 toc14
(VDD - VDP) VOLTAGE (V)
SOURCE CURRENT (mA)0.60
DP SINK CURRENT
vs. (VDD - VDP) VOLTAGE
MAX1807 toc15
(VDD - VDP) VOLTAGE (V)
DP SINK CURRENT (mA)2681012
DP SOURCE CURRENT
vs. (VDD - VDP) VOLTAGE
MAX1807 toc13
(VDD - VDP) VOLTAGE (V)
SOURCE CURRENT (mA)
TH PROPAGATION DELAY
vs. SUPPLY VOLTAGE (TH FALLING)
MAX1807 toc11
SUPPLY VOLTAGE (V)
PROPAGATION DELAY (
TA = -40°C
TA = +85°C
TA =+25°C
10mV
OVERDRIVE0
TH PROPAGATION DELAY
vs. SUPPLY VOLTAGE (TH RISING)
MAX1807 toc12
SUPPLY VOLTAGE (V)
PROPAGATION DELAY (
TA = -40°C
TA = +85°C
TA = +25°C
10mV
OVERDRIVE
IN_ MAXIMUM TRANSIENT PULSE
DURATION vs. PULSE OVERDRIVE VOLTAGE
MAX1807 toc17
OVERDRIVE VOLTAGE (V)
PULSE DURATION (
DP LATCHES (HIGH)
ABOVE THE CURVE
TH MAXIMUM TRANSIENT PULSE
DURATION vs. PULSE OVERDRIVE VOLTAGE
MAX1807 toc18
OVERDRIVE VOLTAGE (V)
PULSE DURATION (
DP GOES
HIGH MOMENTARILY
ABOVE THE CURVE
NEGATIVE-
GOING
TRANSIENT
IN_ AND TH BIAS CURRENT
vs. TEMPERATURE
MAX1807 toc16
TEMPERATURE (°C)
BIAS CURRENT (nA)
MAX1807/MAX1808
Detailed Description
The MAX1807/MAX1808 provide overvoltage protection
for systems with multiple supply rails. Very low output
voltage supplies can have an overvoltage before the
power-supply controller has sufficient supply voltage to
activate protection circuitry. The MAX1807/MAX1808
offer a system-wide approach to effectively protect the
loads and prevent catastrophic events.
The MAX1807/MAX1808 are powered directly by the
main system input supply. A low output voltage from
DP activates a P-channel switch to supply power to the
rest of the system. As the rest of the system supplies
come up, the MAX1807/MAX1808 monitor each of them
for overvoltage conditions and safely disconnect the
input from the rest of the system if any supply malfunc-
tions occur due to a shorted MOSFET, shorted copper
trace, or malfunctioning supply. Built-in overvoltage
detectors in individual power supplies provide redun-
dancy.
The MAX1807/MAX1808 drive the main P-channel load
switch that powers the system. The driver includes
active clamping to safely drive a 12V P-channel MOS-
FET gate. If overvoltage is detected, the P-channel load
switch is turned off and the state is latched. The internal
fault latch resets when VDDis less than 2.7V (power
cycled) or ON is pulled low (manual reset). When ON
is logic low, the P-channel switch is turned off (Table 1).
The MAX1808 has a TH input that turns off the P-chan-
nel switch if TH goes below 1V without affecting the
fault latch. TH output is designed for low-battery detec-
tion. The comparator has 10% hysteresis, allowing the
battery voltage to rise when the load is removed without
reenabling the external P-channel switch.
The MAX1807 has a fault alert output (FAULT) instead
of the TH input. FAULTis an open-drain output, rated
for up to 28V, that directly reflects the state of the inter-
nal fault latch.
IN1–IN5 Overvoltage Comparators
The overvoltage comparators have a 1V trip level. The
fault latch is set if any one of the five overvoltage com-
parators goes above the trip level. A limited input band-
width ensures that small glitches will not trigger an
overvoltage event (see IN_ Maximum Transient Pulse
Duration vs. Pulse Overdrive Voltage in the Typical
Operating Characteristics).
DP PFET Driver Output
The MAX1807/MAX1808 have a totem driver (DP) with
an active clamp that simplifies driving the external P-
channel load switch. The -9.5V Vgsclamp eliminates
complexity in circuits where VDDexceeds the P-chan-
nel FET’s maximum gate voltage. DP goes high and
turns off the P-channel switch during undervoltage
lockout, when ON is low, when TH is less than 1V, or if
an overvoltage fault occurs.
Micropower Adjustable Overvoltage
Protection Controllers
PINNAMEFUNCTION
1–5IN1–IN5Overvoltage Detect Comparator Input. When any input exceeds 1V, the fault latch is set. Connect
unused inputs to GND.GNDGround
7ON
Logic Input. ON turns on internal reference when high. Logic trip level is approximately 1.2V with 15%
hysteresis. When ON is low, the fault latch is reset. ON can be connected directly to VDD at the
expense of supply current.
8DP
External P-Channel MOSFET Gate Driver Output. The output high level is VDD. The output low level is
VDD - 9.5V or GND, whichever is higher. This output is latched high when an overvoltage condition is
detected.
9VDDAnalog Supply Input. Use an external RC filter to eliminate excessive switching noise on VDD. When
VDD is less than 2.7V, the fault latch is reset.
FAULTSignal Overvoltage Condition Output. This open-drain N-channel output is latched low when an over-
voltage condition is detected. (MAX1807 only)Input Monitor Comparator. When TH is below 1V, DP goes high to turn off the external P-channel
switch. When TH exceeds 1.1V, DP goes low if there is no fault. Between 1V and 1.1V is the hysteresis
band where the output state of the TH comparator remains unchanged. (MAX1808 only)
Pin Description

Partno	Mfg	Dc	Qty	Available	Descript
MAX1807EUB	MAX	N/a	129	avai	Micropower Adjustable Overvoltage Protection Controllers
MAX1807EUB+	MAXIM	N/a	1000	avai	Micropower Adjustable Overvoltage Protection Controllers