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MAX16027TP+T-MAX16029TG+
Dual-/Triple-/Quad-Voltage, Capacitor-Adjustable, Sequencing/Supervisory Circuits
General DescriptionThe MAX16025–MAX16030 are dual-/triple-/quad-volt-
age monitors and sequencers that are offered in a
small TQFN package. These devices offer enormous
design flexibility as they allow fixed and adjustable
thresholds to be selected through logic inputs and pro-
vide sequence timing through small external capaci-
tors. These versatile devices are ideal for use in a wide
variety of multivoltage applications.
As the voltage at each monitored input exceeds its
respective threshold, its corresponding output goes
high after a propagation delay or a capacitor-set time
delay. When a voltage falls below its threshold, its
respective output goes low after a propagation delay.
Each detector circuit also includes its own enable input,
allowing the power-good outputs to be shut off inde-
pendently. The independent output for each detector is
available with push-pull or open-drain configuration
with the open-drain version capable of supporting volt-
ages up to 28V, thereby allowing them to interface to
shutdown and enable inputs of various DC-DC regula-
tors. Each detector can operate independently as four
separate supervisory circuits or can be daisy-chained
to provide controlled power-supply sequencing.
The MAX16025–MAX16030 also include a reset func-
tion that deasserts only after all of the independently
monitored voltages exceed their threshold. The reset
timeout is internally fixed or can be adjusted externally.
These devices are offered in a 4mm x 4mm TQFN
package and are fully specified from -40°C to +125°C.
ApplicationsMultivoltage Systems
DC-DC Supplies
Servers/Workstations
Storage Systems
Networking/Telecommunication Equipment
Features2.2V to 28V Operating Voltage RangeFixed Thresholds for 3.3V, 2.5V, 1.8V, 1.5V, and
1.2V Systems1.5% Accurate Adjustable Threshold Monitors
Voltages Down to 0.5V2.7% Accurate Fixed Thresholds Over
TemperatureFixed (140ms min)/Capacitor-Adjustable Delay
TimingIndependent Open-Drain/Push-Pull OutputsEnable Inputs for Each Monitored Voltage9 Logic-Selectable Threshold OptionsManual Reset and Tolerance Select (5%/10%) InputsSmall, 4mm x 4mm TQFN PackageFully Specified from -40°C to +125°C
MAX16025–MAX16030
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory CircuitsTOP VIEW
IN1IN3IN4
TOL
OUT1OUT3OUT4RESETTH0
CDLY3618161413
CDLY2
CDLY1
EN3
EN2
EN1
GND
MAX16029
MAX16030
IN2
OUT2
CDLY411EN4CRESET12TH1MR
THIN QFN
(4mm x 4mm)
Pin Configurations
Ordering Information19-0525; Rev 3; 1/07
+Denotes lead-free package.
*For tape and reel, add a “T” after the “+.” All tape and reel
orders are available in 2.5k increments.
EVALUATION KIT
AVAILABLE
PART*TEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX16025TE+-40°C to +125°C16 TQFNT1644-4
MAX16026TE+-40°C to +125°C16 TQFNT1644-4
MAX16027TP+-40°C to +125°C20 TQFNT2044-3
MAX16028TP+-40°C to +125°C20 TQFNT2044-3
MAX16029TG+-40°C to +125°C24 TQFNT2444-4
MAX16030TG+-40°C to +125°C24 TQFNT2444-4
Selector Guide
PARTMONITORED
VOLTAGES
INDEPENDENT
OUTPUTSRESET
OUTPUTMAX1602522 (Open-drain)Open-drain
MAX1602622 (Push-pull)Push-pull
MAX1602733 (Open-drain)Open-drain
MAX1602833 (Push-pull)Push-pull
MAX1602944 (Open-drain)Open-drain
MAX1603044 (Push-pull)Push-pullPin Configurations continued at end of data sheet.
MAX16025–MAX16030
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= 2.2V to 28V, TA= -40°C to +125°C, unless otherwise specified. Typical values are at VCC= 3.3V and 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.
(All voltages referenced to GND.)
VCC.........................................................................-0.3V to +30V
EN1–EN4....................................................-0.3V to (VCC+ 0.3V)
OUT1–OUT4 (push-pull).............................-0.3V to (VCC+ 0.3V)
OUT1–OUT4 (open-drain)......................................-0.3V to +30V
RESET(push-pull)......................................-0.3V to (VCC+ 0.3V)
RESET(open-drain)..................................................-0.3V to 30V
IN1–IN4.......................................................-0.3V to (VCC+ 0.3V)
MR, TOL, TH1, TH0....................................-0.3V to (VCC+ 0.3V)
CDLY1–CDLY4.........................................................-0.3V to +6V
CRESET......................................................-0.3V to (VCC+ 0.3V)
Input/Output Current (all pins)..........................................±20mA
Continuous Power Dissipation (TA= +70°C)
16-Pin TQFN (derate 25mW/°C above +70°C)...........2000mW
20-Pin TQFN (derate 25.6mW/°C above +70°C)........2051mW
24-Pin TQFN (derate 27.8mW/°C above +70°C)........2222mW
Operating Temperature Range.........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SUPPLYOperating Voltage RangeVCC(Note 2)2.228.0V
Undervoltage LockoutUVLO(Note 2)1.81.92.0V
Undervoltage-Lockout HysteresisUVLOHYSTVCC falling50mV
VCC = 3.3V4075
VCC = 12V4775VCC Supply CurrentICC
All OUT_ and RESET at
logic-high (IN_ current
excluded)VCC = 28V5280
INPUTS (IN_)3.3V threshold, TOL = GND2.9703.0523.135
3.3V threshold, TOL = VCC2.8052.8882.970
2.5V threshold, TOL = GND2.2502.3132.375
2.5V threshold, TOL = VCC2.1252.1872.250
1.8V threshold, TOL = GND1.6201.6651.710
1.8V threshold, TOL = VCC1.5301.5751.620
1.5V threshold, TOL = GND1.3501.3871.425
1.5V threshold, TOL = VCC1.2751.3121.350
1.2V threshold, TOL = GND1.0801.1101.140
IN_ Thresholds (IN_ Falling)VTH
1.2V threshold, TOL = VCC1.0201.0501.080
TOL = GND0.4920.50.508Adjustable Threshold (IN_
Falling)VTHTOL = VCC0.4630.4720.481V
IN_ Hysteresis (IN_ Rising)VHYST0.5%
IN_ Input ResistanceFixed threshold500918kΩ
IN_ Input CurrentILAdjustable threshold only (VIN_ = 1V)-100+100nA
MAX16025–MAX16030
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)(VCC= 2.2V to 28V, TA= -40°C to +125°C, unless otherwise specified. Typical values are at VCC= 3.3V and TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
CRESET AND CDLY_CRESET ThresholdVTH-RESETCRESET rising, VCC = 3.3V0.4650.50.535V
CRESET Charge CurrentICH-RESETVCC = 3.3V380500620nA
CDLY_ ThresholdVTH-CDLYCDLY_ rising, VCC = 3.3V0.9511.05V
CDLY_ Charge CurrentICH-CDLYVCC = 3.3V200250300nA
DIGITAL LOGIC INPUTS (EN_, MR, TOL, TH1, TH0)Input Low VoltageVIL0.4V
Input High VoltageVIH1.4V
TH1, TH0 Logic-Input Floating0.6V
TOL, TH1, TH0 Logic-Input
CurrentVTOL, VTH1, VTH0 = GND or VCC-1+1µA
EN_ Input Leakage CurrentVEN_ = VCC or GND-100+100nA
MR Internal Pullup CurrentVCC = 3.3V250535820nA
OUTPUTS (OUT_, RESET)VCC ≥ 1.2V, ISINK = 90µA0.3
VCC ≥ 2.25V, ISINK = 0.5mA0.3Output Low Voltage (Open-Drain
or Push-Pull)VOL
VCC ≥ 4.5V, ISINK = 1mA0.35
VCC ≥ 3V, ISOURCE = 500µA0.8 x VCCOutput High Voltage (Push-Pull)VOHVCC ≥ 4.5V, ISOURCE = 800µA0.8 x VCCV
Output Leakage Current (Open-
Drain)ILKGOutput not asserted low, VOUT = 28V1µA
CRESET = VCC, VCC = 3.3V140190260Reset Timeout PeriodtRPCRESET open0.030ms
TIMINGtDELAY+IN_ rising, CDLY_ open35IN_ to OUT_ Propagation DelaytDELAY-IN_ falling, CDLY_ open20µs
IN_ to RESET Propagation DelaytRST-DELAYIN_ falling35µs
MR Minimum Input Pulse Width(Note 3)2µs
EN_ or MR Glitch Rejection280ns
tOFFFrom device enabled to device disabled3
EN_ to OUT_ DelaytONFrom device disabled to device enabled
(CDLY_ open)30µs
MR to RESET DelayMR falling3µs
Note 1:Devices are production tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 2:Operating below the UVLO causes all outputs to go low. The outputs are guaranteed to be in the correct state for VCCdown
to 1.2V.
Note 3:In order to guarantee an assertion, the minimum input pulse width must be greater than 2µs.
MAX16025–MAX16030
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
Typical Operating Characteristics(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGEMAX16025 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (221814106
MAX16026
SUPPLY CURRENT
vs. TEMPERATUREMAX16025 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (
MAX16026VCC = 28V
VCC = 12V
VCC = 3.3V
NORMALIZED ADJUSTABLE THRESHOLD
vs. TEMPERATUREMAX16025 toc03
TEMPERATURE (°C)
NORMALIZED THRESHOLD
TOL = VCC
TOL = GND
ADJUSTABLE THRESHOLD
NORMALIZED ADJUSTABLE THRESHOLD
vs. TEMPERATUREMAX16025 toc04
TEMPERATURE (°C)
NORMALIZED THRESHOLD
TOL = VCC
TOL = GND
3.3V THRESHOLD
OUT_ DELAY vs. CCDLY_MAX16025 toc05
CCDLY_ (nF)
OUT_ DELAY (ms)
RESET TIMEOUT PERIOD
vs. CCRESET
MAX16025 toc06
CCRESET (nF)
RESET TIMEOUT PERIOD (ms)
FIXED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX16025 toc07
TEMPERATURE (°C)
FIXED RESET TIMEOUT PERIOD (ms)
CRESET = VCC
OUT_ LOW VOLTAGE
vs. SINK CURRENTMAX16025 toc08
SINK CURRENT (mA)
OUT_
(V)54321
OUT_ HIGH VOLTAGE
vs. SOURCE CURRENT
MAX16025 toc09
SOURCE CURRENT (mA)
OUT_
(V)
PUSH-PULL VERSIONS
MAX16025–MAX16030
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
RESET OUTPUT LOW VOLTAGE
vs. SINK CURRENTMAX16025 toc10
SINK CURRENT (mA)
RESET OUTPUT LOW VOLTAGE (V)53421
RESET OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
MAX16025 toc11
SOURCE CURRENT (mA)
RESET OUTPUT HIGH VOLTAGE (V)
PUSH-PULL VERSIONS
ENABLE TURN-OFFMAX16025 toc12
4μs/div
EN_
OUT_
RESET
CRESET = VCC
CDLY_ = OPEN
ENABLE TURN-ONMAX16025 toc13
40ms/div
EN_
OUT_
RESET
CRESET = VCC
CDLY_ = OPEN
RESET TIMEOUT DELAYMAX16025 toc14
100ms/div
IN_
OUT_
RESET
CRESET = VCC
CDLY_ = OPEN
MR FALLING vs. RESETMAX16025 toc15
4μs/div
RESET
CRESET = VCC
CDLY_ = OPEN
MR RISING vs. RESETMAX16025 toc16
40ms/div
RESET
CRESET = VCC
CDLY_ = OPEN
MAXIMUM TRANSIENT DURATION
vs. THRESHOLD OVERDRIVEMAX16025 toc17
THRESHOLD OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (
OUTPUT ASSERTED ABOVE THIS LINE
Typical Operating Characteristics (continued)(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
MAX16025–MAX16030
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
Pin Description
PIN
MAX16025/
MAX16026
MAX16027/
MAX16028
MAX16029/
MAX16030
NAMEFUNCTION1VCC
Supply Voltage Input. Connect a 2.2V to 28V supply voltage to power the
device. All outputs are low when VCC is below the UVLO. For noisy systems,
bypass VCC to GND with a 0.1µF capacitor.22IN1
Monitored Input 1. When the voltage at IN1 exceeds its threshold, OUT1 goes
high after the capacitor-adjustable delay period. When the voltage at IN1 falls
below its threshold, OUT1 goes low after a propagation delay.33IN2
Monitored Input 2. When the voltage at IN2 exceeds its threshold, OUT2 goes
high after the capacitor-adjustable delay period. When the voltage at IN2 falls
below its threshold, OUT2 goes low after a propagation delay.44IN3
Monitored Input 3. When the voltage at IN3 exceeds its threshold, OUT3 goes
high after the capacitor-adjustable delay period. When the voltage at IN3 falls
below its threshold, OUT3 goes low after a propagation delay.—5IN4
Monitored Input 4. When the voltage at IN4 exceeds its threshold, OUT4 goes
high after the capacitor-adjustable delay period. When the voltage at IN4 falls
below its threshold, OUT4 goes low after a propagation delay.56TOLThreshold Tolerance Input. Connect TOL to GND to select thresholds 5%
below nominal. Connect TOL to VCC to select thresholds 10% below nominal.67GNDGround78EN1
Active-High Logic-Enable Input 1. Driving EN1 low causes OUT1 to go low
regardless of the input voltage. Drive EN1 high to enable the monitoring
comparator.89EN2
Active-High Logic-Enable Input 2. Driving EN2 low causes OUT2 to go low
regardless of the input voltage. Drive EN2 high to enable the monitoring
comparator.910EN3
Active-High Logic-Enable Input 3. Driving EN3 low causes OUT3 to go low
regardless of the input voltage. Drive EN3 high to enable the monitoring
comparator.—11EN4
Active-High Logic-Enable Input 4. Driving EN4 low causes OUT4 to go low
regardless of the input voltage. Drive EN4 high to enable the monitoring
comparator.1012TH1Threshold Select Input 1. Connect TH1 to VCC or GND, or leave it open to
select the input-voltage threshold option in conjunction with TH0 (see Table 2).1113TH0Threshold Select Input 0. Connect TH0 to VCC or GND, or leave it open to
select the input-voltage threshold option in conjunction with TH1 (see Table 2).—14OUT4Output 4. When the voltage at IN4 is below its threshold or EN4 goes low,
OUT4 goes low.1215OUT3Output 3. When the voltage at IN3 is below its threshold or EN3 goes low,
OUT3 goes low.1316OUT2Output 2. When the voltage at IN2 is below its threshold or EN2 goes low,
OUT2 goes low.
MAX16025–MAX16030
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
Pin Description (continued)
PIN
MAX16025/
MAX16026
MAX16027/
MAX16028
MAX16029/
MAX16030
NAMEFUNCTION1417OUT1Output 1. When the voltage at IN1 is below its threshold or EN1 goes low,
OUT1 goes low.1518RESET
Active-Low Reset Output. RESET asserts low when any of the monitored
voltages (IN_) falls below its respective threshold, any EN_ goes low, or MR is
asserted. RESET remains asserted for the reset timeout period after all of the
monitored voltages exceed their respective threshold, all EN_ are high, all
OUT_ are high, and MR is deasserted.1619MR
Active-Low Manual Reset Input. Pull MR low to assert RESET low. RESET
remains low for the reset timeout period after MR is deasserted (as long as all
OUT_ are high).1720CRESET
Capacitor-Adjustable Reset Delay Input. Connect an external capacitor from
CRESET to GND to set the reset timeout period or connect to VCC for the
default 140ms minimum reset timeout period. Leave CRESET open for internal
propagation delay.—21CDLY4
Capacitor-Adjustable Delay Input 4. Connect an external capacitor from
CDLY4 to GND to set the IN4 to OUT4 (and EN4 to OUT4) delay period.
Leave CDLY4 open for internal propagation delay.1822CDLY3
Capacitor-Adjustable Delay Input 3. Connect an external capacitor from
CDLY3 to GND to set the IN3 to OUT3 (and EN3 to OUT3) delay period.
Leave CDLY3 open for internal propagation delay.1923CDLY2
Capacitor-Adjustable Delay Input 2. Connect an external capacitor from
CDLY2 to GND to set the IN2 to OUT2 (and EN2 to OUT2) delay period.
Leave CDLY2 open for internal propagation delay.2024CDLY1
Capacitor-Adjustable Delay Input 1. Connect an external capacitor from
CDLY1 to GND to set the IN1 to OUT1 (and EN1 to OUT1) delay period.
Leave CDLY1 open for internal propagation delay.—EPExposed Pad. EP is internally connected to GND. Connect EP to the
ground plane.
Table1. Output State*
EN_IN_OUT_LowVIN_ < VTHLow
HighVIN_ < VTHLow
LowVIN_ > VTHLow
OUT_ = high
(MAX16026/MAX16028/
MAX16030)
HighVIN_ > VTH
OUT_ = high impedance
(MAX16025/MAX16027/
MAX16029)
Table2. Input-Voltage Threshold Selector
TH1/TH0
LOGIC
IN1 (ALL
VERSIONS)
(V)
IN2 (ALL
VERSIONS)
(V)
IN3
(MAX16027/
MAX16028)
(V)
IN4
(MAX16029/
MAX16030)
(V)Low/Low3.32.51.81.5
Low/High3.31.8AdjAdj
Low/Open3.31.5AdjAdj
High/Low3.31.21.82.5
High/High2.51.8AdjAdj
High/Open3.3Adj2.5Adj
Open/Low3.3AdjAdjAdj
Open/High2.5AdjAdjAdj
Open/OpenAdjAdjAdjAdj
*When VCCfalls below the UVLO, all outputs go low regardless
of the state of EN_ and VIN_. The outputs are guaranteed to be
in the correct state for VCCdown to 1.2V.
MAX16025–MAX16030
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory CircuitsLOGIC
250nA
OUT1
OUT2
OUT3
OUT4
RESET
EN1EN2EN3EN4TH1TH0
IN1
IN2
IN3
IN4
GND
TOL
DRIVER
DRIVER
DRIVER
DRIVER
DELAY
DELAY
DELAY
DELAY
VCCCDLY1CDLY2CDLY3CDLY4CRESETMR
REFERENCE
THRESHOLD
SELECT
LOGIC
RESET
DELAY
LOGIC
DRIVER
MAX16029
MAX16030
Figure 1. MAX16029/MAX16030 Simplified Functional Diagram
