19-0525; Rev 3; 1/07
KIT ATION EVALU LE B AVAILA
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits
General Description
The MAX16025–MAX16030 are dual-/triple-/quad-voltage 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 provide sequence timing through small external capacitors. 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 independently. The independent output for each detector is available with push-pull or open-drain configuration with the open-drain version capable of supporting voltages up to 28V, thereby allowing them to interface to shutdown and enable inputs of various DC-DC regulators. 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 function 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.
Features
o 2.2V to 28V Operating Voltage Range o Fixed Thresholds for 3.3V, 2.5V, 1.8V, 1.5V, and 1.2V Systems o 1.5% Accurate Adjustable Threshold Monitors Voltages Down to 0.5V o 2.7% Accurate Fixed Thresholds Over Temperature o Fixed (140ms min)/Capacitor-Adjustable Delay Timing o Independent Open-Drain/Push-Pull Outputs o Enable Inputs for Each Monitored Voltage o 9 Logic-Selectable Threshold Options o Manual Reset and Tolerance Select (5%/10%) Inputs o Small, 4mm x 4mm TQFN Package o Fully Specified from -40°C to +125°C
MAX16025–MAX16030
Ordering Information
PART* MAX16025TE+ MAX16026TE+ MAX16027TP+ MAX16028TP+ MAX16029TG+ TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PINPACKAGE 16 TQFN 16 TQFN 20 TQFN 20 TQFN 24 TQFN PKG CODE T1644-4 T1644-4 T2044-3 T2044-3 T2444-4
Applications
Multivoltage Systems DC-DC Supplies Servers/Workstations Storage Systems Networking/Telecommunication Equipment
MAX16030TG+ -40°C to +125°C 24 TQFN T2444-4 +Denotes lead-free package. *For tape and reel, add a “T” after the “+.” All tape and reel orders are available in 2.5k increments.
Pin Configurations
RESET OUT1 OUT3 18 MR 19 CRESET 20 17 16 15 14 13 12 11 10 TH1 EN4 EN3 EN2 EN1 GND TH0 9 8 7 1 VCC 2 IN1 3 IN2 4 IN3 5 IN4 6 TOL
TOP VIEW
Selector Guide
PART MAX16025 MAX16026 MAX16027 MAX16028 MAX16029 MAX16030 MONITORED VOLTAGES 2 2 3 3 4 4 INDEPENDENT OUTPUTS 2 (Open-drain) 2 (Push-pull) 3 (Open-drain) 3 (Push-pull) 4 (Open-drain) 4 (Push-pull) RESET OUTPUT Open-drain Push-pull Open-drain Push-pull Open-drain Push-pull
CDLY4 21 CDLY3 22 CDLY2 23 CDLY1 24
MAX16029 MAX16030
+
THIN QFN (4mm x 4mm)
Pin Configurations continued at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
OUT2
OUT4
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030
ABSOLUTE MAXIMUM RATINGS
(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
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.
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)
PARAMETER SUPPLY Operating Voltage Range Undervoltage Lockout Undervoltage-Lockout Hysteresis VCC UVLO (Note 2) (Note 2) 2.2 1.8 1.9 50 VCC = 3.3V VCC = 12V VCC = 28V 2.970 2.805 2.250 2.125 1.620 1.530 1.350 1.275 1.080 1.020 0.492 0.463 500 -100 40 47 52 3.052 2.888 2.313 2.187 1.665 1.575 1.387 1.312 1.110 1.050 0.5 0.472 0.5 Fixed threshold IL Adjustable threshold only (VIN_ = 1V) 918 +100 75 75 80 3.135 2.970 2.375 2.250 1.710 1.620 1.425 1.350 1.140 1.080 0.508 0.481 V % kΩ nA V µA 28.0 2.0 V V mV SYMBOL CONDITIONS MIN TYP MAX UNITS
UVLOHYST VCC falling All OUT_ and RESET at logic-high (IN_ current excluded)
VCC Supply Current INPUTS (IN_)
ICC
3.3V threshold, TOL = GND 3.3V threshold, TOL = VCC 2.5V threshold, TOL = GND 2.5V threshold, TOL = VCC IN_ Thresholds (IN_ Falling) VTH 1.8V threshold, TOL = GND 1.8V threshold, TOL = VCC 1.5V threshold, TOL = GND 1.5V threshold, TOL = VCC 1.2V threshold, TOL = GND 1.2V threshold, TOL = VCC Adjustable Threshold (IN_ Falling) IN_ Hysteresis (IN_ Rising) IN_ Input Resistance IN_ Input Current VTH VHYST TOL = GND TOL = VCC
2
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Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, 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)
PARAMETER CRESET AND CDLY_ CRESET Threshold CRESET Charge Current CDLY_ Threshold CDLY_ Charge Current Input Low Voltage Input High Voltage TH1, TH0 Logic-Input Floating TOL, TH1, TH0 Logic-Input Current EN_ Input Leakage Current MR Internal Pullup Current OUTPUTS (OUT_, RESET) Output Low Voltage (Open-Drain or Push-Pull) Output High Voltage (Push-Pull) Output Leakage Current (OpenDrain) Reset Timeout Period TIMING IN_ to OUT_ Propagation Delay IN_ to RESET Propagation Delay MR Minimum Input Pulse Width EN_ or MR Glitch Rejection tOFF EN_ to OUT_ Delay MR to RESET Delay tON From device enabled to device disabled From device disabled to device enabled (CDLY_ open) MR falling tDELAY+ tDELAYIN_ rising, CDLY_ open IN_ falling, CDLY_ open 35 20 35 2 280 3 30 3 µs µs µs µs µs ns VCC ≥ 1.2V, ISINK = 90µA VOL VCC ≥ 2.25V, ISINK = 0.5mA VCC ≥ 4.5V, ISINK = 1mA VOH ILKG tRP VCC ≥ 3V, ISOURCE = 500µA VCC ≥ 4.5V, ISOURCE = 800µA Output not asserted low, VOUT = 28V CRESET = VCC, VCC = 3.3V CRESET open 140 190 0.030 0.8 x VCC 0.8 x VCC 1 260 0.3 0.3 0.35 V µA ms V VTOL, VTH1, VTH0 = GND or VCC VEN_ = VCC or GND VCC = 3.3V -1 -100 250 535 VTH-RESET ICH-RESET VTH-CDLY ICH-CDLY VIL VIH 1.4 0.6 +1 +100 820 CRESET rising, VCC = 3.3V VCC = 3.3V CDLY_ rising, VCC = 3.3V VCC = 3.3V 0.465 380 0.95 200 0.5 500 1 250 0.535 620 1.05 300 0.4 V nA V nA V V V µA nA nA SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX16025–MAX16030
DIGITAL LOGIC INPUTS (EN_, MR, TOL, TH1, TH0)
tRST-DELAY IN_ falling (Note 3)
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 VCC down to 1.2V. Note 3: In order to guarantee an assertion, the minimum input pulse width must be greater than 2µs.
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3
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16025 toc01
SUPPLY CURRENT vs. TEMPERATURE
VCC = 28V 55 SUPPLY CURRENT (μA) 50 45 VCC = 12V 40 35 30 VCC = 3.3V MAX16026
MAX16025 toc02
NORMALIZED ADJUSTABLE THRESHOLD vs. TEMPERATURE
1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 0.994 0.993 0.992 0.991 0.990 TOL = VCC
MAX16025 toc03
60 MAX16026 55 SUPPLY CURRENT (μA) 50 45 40 35 30 2 6 10 14 18 22 26
60
NORMALIZED THRESHOLD
TOL = GND
ADJUSTABLE THRESHOLD -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C)
30
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
NORMALIZED ADJUSTABLE THRESHOLD vs. TEMPERATURE
1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 0.994 0.993 0.992 0.991 0.990 TOL = VCC
MAX16025 toc04
OUT_ DELAY vs. CCDLY_
4500 4000 OUT_ DELAY (ms) 3500 3000 2500 2000 1500 1000
MAX16025 toc05
RESET TIMEOUT PERIOD vs. CCRESET
MAX16025 toc06
5000
RESET TIMEOUT PERIOD (ms)
1200 1100 1000 900 800 700 600 500 400 300 200 100 0
NORMALIZED THRESHOLD
TOL = GND
3.3V THRESHOLD -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C)
500 0 0 100 200 300 400 500 600 700 800 900 1000 CCDLY_ (nF)
0 100 200 300 400 500 600 700 800 900 1000 CCRESET (nF)
FIXED RESET TIMEOUT PERIOD vs. TEMPERATURE
194 193 192 CRESET = VCC
MAX16025 toc07
OUT_ LOW VOLTAGE vs. SINK CURRENT
MAX16025 toc08
OUT_ HIGH VOLTAGE vs. SOURCE CURRENT
MAX16025 toc09
195 FIXED RESET TIMEOUT PERIOD (ms)
1.0
3.5 3.0 2.5
0.8
VOUT_ (V)
191 190 189 188 187 186 185 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C)
VOUT_ (V)
0.6
2.0 1.5 1.0
0.4
0.2 0.5 PUSH-PULL VERSIONS 0 0 1 2 3 4 5 SINK CURRENT (mA) 6 7 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 SOURCE CURRENT (mA)
4
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Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
MAX16025–MAX16030
RESET OUTPUT LOW VOLTAGE vs. SINK CURRENT
MAX16025 toc10
RESET OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT
MAX16025 toc11
ENABLE TURN-OFF
MAX16025 toc12
1.0 0.9 RESET OUTPUT LOW VOLTAGE (V) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 6 7 SINK CURRENT (mA)
3.5 RESET OUTPUT HIGH VOLTAGE (V) 3.0 2.5 2.0 1.5 1.0 0.5 PUSH-PULL VERSIONS 0 0
CRESET = VCC CDLY_ = OPEN
EN_
OUT_
RESET
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 SOURCE CURRENT (mA)
4μs/div
ENABLE TURN-ON
MAX16025 toc13
RESET TIMEOUT DELAY
MAX16025 toc14
MR FALLING vs. RESET
MAX16025 toc15
CRESET = VCC CDLY_ = OPEN EN_
CRESET = VCC CDLY_ = OPEN IN_
CRESET = VCC CDLY_ = OPEN
MR
OUT_
OUT_ RESET
RESET
RESET
40ms/div
100ms/div
4μs/div
MR RISING vs. RESET
MAX16025 toc16
MAXIMUM TRANSIENT DURATION vs. THRESHOLD OVERDRIVE
MAXIMUM TRANSIENT DURATION (μs) 90 80 70 60 50 40 30 20 10 0 1 10 100 1000 OUTPUT ASSERTED ABOVE THIS LINE
MAX16025 toc17
100
CRESET = VCC CDLY_ = OPEN MR
RESET
40ms/div
THRESHOLD OVERDRIVE (mV)
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5
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030
Pin Description
PIN MAX16025/ MAX16026 1 MAX16027/ MAX16029/ MAX16028 MAX16030 1 1 NAME FUNCTION 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. 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. 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. 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. 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. Threshold Tolerance Input. Connect TOL to GND to select thresholds 5% below nominal. Connect TOL to VCC to select thresholds 10% below nominal. Ground 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. 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. 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. 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. Threshold 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). Threshold 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). Output 4. When the voltage at IN4 is below its threshold or EN4 goes low, OUT4 goes low. Output 3. When the voltage at IN3 is below its threshold or EN3 goes low, OUT3 goes low. Output 2. When the voltage at IN2 is below its threshold or EN2 goes low, OUT2 goes low.
VCC
2
2
2
IN1
3
3
3
IN2
—
4
4
IN3
—
—
5
IN4
4 5 6
5 6 7
6 7 8
TOL GND EN1
7
8
9
EN2
—
9
10
EN3
—
—
11
EN4
8 9 — — 10
10 11 — 12 13
12 13 14 15 16
TH1 TH0 OUT4 OUT3 OUT2
6
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Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits
Pin Description (continued)
PIN MAX16025/ MAX16026 11 MAX16027/ MAX16029/ MAX16028 MAX16030 14 17 NAME FUNCTION Output 1. When the voltage at IN1 is below its threshold or EN1 goes low, OUT1 goes low. 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.
MAX16025–MAX16030
OUT1
12
15
18
RESET
13
16
19
14
17
20
—
—
21
—
18
22
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). 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 CRESET default 140ms minimum reset timeout period. Leave CRESET open for internal propagation delay. Capacitor-Adjustable Delay Input 4. Connect an external capacitor from CDLY4 CDLY4 to GND to set the IN4 to OUT4 (and EN4 to OUT4) delay period. Leave CDLY4 open for internal propagation delay. Capacitor-Adjustable Delay Input 3. Connect an external capacitor from CDLY3 CDLY3 to GND to set the IN3 to OUT3 (and EN3 to OUT3) delay period. Leave CDLY3 open for internal propagation delay. MR CDLY2 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. 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. Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane.
15
19
23
16
20
24
CDLY1
—
—
—
EP
Table 1. Output State*
EN_ Low High Low IN_ VIN_ < VTH VIN_ < VTH VIN_ > VTH Low Low Low OUT_ = high (MAX16026/MAX16028/ MAX16030) High VIN_ > VTH OUT_ = high impedance (MAX16025/MAX16027/ MAX16029) OUT_
Table 2. Input-Voltage Threshold Selector
TH1/TH0 LOGIC Low/Low Low/High Low/Open High/Low High/High High/Open Open/Low Open/High Open/Open IN3 IN4 IN1 (ALL IN2 (ALL (MAX16027/ (MAX16029/ VERSIONS) VERSIONS) MAX16028) MAX16030) (V) (V) (V) (V) 3.3 3.3 3.3 3.3 2.5 3.3 3.3 2.5 Adj 2.5 1.8 1.5 1.2 1.8 Adj Adj Adj Adj 1.8 Adj Adj 1.8 Adj 2.5 Adj Adj Adj 1.5 Adj Adj 2.5 Adj Adj Adj Adj Adj
*When VCC falls 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 VCC down to 1.2V.
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7
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030
TH0 TH1 EN4 EN3 EN2 EN1 DELAY
IN1
THRESHOLD SELECT LOGIC
250nA
LOGIC
DRIVER
OUT1
1V
IN2
MAX16029 MAX16030
DELAY
DRIVER
OUT2
IN3
DELAY
DRIVER
OUT3
IN4
DELAY
DRIVER
OUT4
GND RESET DELAY LOGIC TOL REFERENCE DRIVER RESET
VCC
CDLY1
CDLY2
CDLY3
CDLY4
CRESET
MR
Figure 1. MAX16029/MAX16030 Simplified Functional Diagram
8
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Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030
VCC VUVLO
IN_
VTH
VTH t < tON
EN_
OUT_
tDELAYtON tDELAY+ tRST_DELAY tRP RESET tRP tOFF
tON
tRP
Figure 2. Timing Diagram (CDLY_ Open)
Detailed Description
The MAX16025–MAX16030 are low-voltage, accurate, dual-/triple-/quad-voltage microprocessor (µP) supervisors in a small TQFN package. These devices provide supervisory and sequencing functions for complex multivoltage systems. The MAX16025/MAX16026 monitor two voltages, the MAX16027/MAX16028 monitor three voltages, and the MAX16029/MAX16030 monitor four voltages. The MAX16025–MAX16030 offer independent outputs and enable functions for each monitored voltage. This configuration allows the device to operate as four separate supervisory circuits or be daisy-chained together to allow controlled sequencing of power supplies during
power-up initialization. When all of the monitored voltages exceed their respective thresholds, an independent reset output deasserts to allow the system processor to operate. These devices offer enormous flexibility as there are nine threshold options that are selected through two threshold-select logic inputs. Each monitor circuit also offers an independent enable input to allow both digital and analog control of each monitor output. A tolerance select input allows these devices to be used in systems requiring 5% or 10% power-supply tolerances. In addition, the time delays and reset timeout can be adjusted using small capacitors. There is also a fixed 140ms minimum reset timeout feature.
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9
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030
Applications Information
Tolerance
The MAX16025–MAX16030 feature a pin-selectable threshold tolerance. Connect TOL to GND to select the thresholds 5% below the nominal value. Connect TOL to VCC to select the threshold tolerance 10% below the nominal voltage. Do not leave TOL unconnected. The following equation is provided to help estimate the value of the resistors based on the amount of acceptable error: e × VINTH R1 = A IL where eA is the fraction of the maximum acceptable absolute resistive divider error attributable to the input leakage current (use 0.01 for ±1%), VINTH is the voltage at which the output (OUT_) should assert, and IL is the worst-case IN_ leakage current (see the Electrical Characteristics). Calculate R2 as follows: R2 = VTH × R1 VINTH − VTH
Adjustable Input
These devices offer several monitoring options with both fixed and/or adjustable reset thresholds (see Table 2). For the adjustable threshold inputs, the threshold voltage (VTH) at each adjustable IN_ input is typically 0.5V (TOL = GND) or 0.472V (TOL = VCC). To monitor a voltage VINTH, connect a resistive divider network to the circuit as shown in Figure 3 and use the following equation to calculate the threshold voltage: R1 ⎞ ⎛ VINTH = VTH × ⎜1 + ⎟ ⎝ R2 ⎠ Choosing the proper external resistors is a balance between accuracy and power use. The input to the voltage monitor is a high-impedance input with a small 100nA leakage current. This leakage current contributes to the overall error of the threshold voltage where the output is asserted. This induced error is proportional to the value of the resistors used to set the threshold. With lower value resistors, this error is reduced, but the amount of power consumed in the resistors increases.
VINTH R1 IN_
Unused Inputs
Connect any unused IN_ and EN_ inputs to VCC.
OUT_ Output
An OUT_ goes low when its respective IN_ input voltage drops below its specified threshold or when its EN_ goes low (see Table 1). OUT_ goes high when EN_ is high and V IN_ is above its threshold after a time delay. The MAX16025/MAX16027/MAX16029 feature open-drain, outputs while the MAX16026/MAX16028/MAX16030 have push-pull outputs. Open-drain outputs require an external pullup resistor to any voltage from 0 to 28V.
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. The MAX16025/ MAX16027/MAX16029 have an open-drain, active-low reset output, while the MAX16026/MAX16028/ MAX16030 have a push-pull, active-low reset output. Open-drain RESET requires an external pullup resistor to any voltage from 0 to 28V.
MAX16025– MAX16030
R2
VTH
Adjustable Reset Timeout Period (CRESET)
R1 = R2 x
( VVINTH -1) TH
All of these parts offer an internally fixed reset timeout (140ms min) by connecting CRESET to VCC. The reset timeout can also be adjusted by connecting a capacitor from CRESET to GND. When the voltage at CRESET reaches 0.5V, RESET goes high. When RESET goes high, CRESET is immediately held low.
Figure 3. Setting the Adjustable Input
10
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Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits
Calculate the reset timeout period as follows: debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connect a 0.1µF capacitor from MR to GND to provide additional noise immunity.
MAX16025–MAX16030
V t RP = TH−RESET × CCRESET + 35 × 10 −6 ICH−RESET where VTH-RESET is 0.5V, ICH-RESET is 0.5µA, tRP is in seconds, and CCRESET is in Farads. To ensure timing accuracy and proper operation, minimize leakage at CCRESET.
Pullup Resistor Values
The exact value of the pullup resistors for the opendrain outputs is not critical, but some consideration should be made to ensure the proper logic levels when the device is sinking current. For example, if VCC = 2.25V and the pullup voltage is 28V, keep the sink current less than 0.5mA as shown in the Electrical Characteristics table. As a result, the pullup resistor should be greater than 56kΩ. For a 12V pullup, the resistor should be larger than 24kΩ. Note that the ability to sink current is dependent on the VCC supply voltage.
Adjustable Delay (CDLY_)
When VIN rises above VTH with EN_ high, the internal 250nA current source begins charging an external capacitor connected from CDLY_ to GND. When the voltage at CDLY_ reaches 1V, OUT_ goes high. When OUT_ goes high, CDLY_ is immediately held low. Adjust the delay (tDELAY) from when VIN rises above VTH (with EN_ high) to OUT_ going high according to the equation: V tDELAY = TH− CDLY × CCDLY + 35 × 10 −6 ICH− CDLY where VTH-CDLY is 1V, ICH-CDLY is 0.25µA, CCDLY is in Farads, tDELAY is in seconds, and tDELAY+ is the internal propagation delay of the device. To ensure timing accuracy and proper operation, minimize leakage at CDLY.
Power-Supply Bypassing
The device operates with a VCC supply voltage from 2.2V to 28V. When VCC falls below the UVLO threshold, all the outputs go low and stay low until VCC falls below 1.2V. For noisy systems or fast rising transients on VCC, connect a 0.1µF ceramic capacitor from VCC to GND as close to the device as possible to provide better noise and transient immunity.
Ensuring Valid Output with VCC Down to 0V (MAX16026/MAX16028/MAX16030 Only)
When VCC falls below 1.2V, the ability for the output to sink current decreases. In order to ensure a valid output as VCC falls to 0V, connect a 100kΩ resistor from OUT/RESET to GND.
Manual-Reset Input (MR)
Many µP-based products require manual-reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic-low on M R asserts RESET low. RESET remains asserted while MR is low and during the reset timeout period (140ms fixed or capacitor adjustable) after MR returns high. The MR input has a 500nA internal pullup, so it can be left unconnected, if not used. MR can be driven with TTL or CMOS logic levels, or with open-drain/collector outputs. Connect a normally open momentary switch from MR to GND to create a manual-reset function. External
Typical Application Circuits
Figures 4 and 5 show typical applications for the MAX16025–MAX16030. In high-power applications, using an n-channel device reduces the loss across the MOSFETs as it offers a lower drain-to-source on-resistance. However, an n-channel MOSFET requires a sufficient VGS voltage to fully enhance it for a low RDS_ON. The application in Figure 4 shows the MAX16027 configured in a multiple-output sequencing application. Figure 5 shows the MAX16029 in a power-supply sequencing application using n-channel MOSFETs.
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11
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030
+12V BUS
+3.3V IN DC-DC EN OUT IN DC-DC EN OUT
+2.5V IN DC-DC EN OUT
+1.8V
EN1 VCC
IN1
OUT1
EN2
IN2
OUT2
EN3
IN3 OUT3 +3.3V
MAX16027
MR RESET CDLY1 CDLY2 CDLY3 CRESET GND TOL TH0 TH1 SYSTEM RESET
Figure 4. Sequencing Multiple-Voltage System
12V BUS 1.5V
1.8V TO LOADS 2.5V
3.3V IN1 OUT1 IN2 OUT2 IN3 OUT3 IN4 OUT4 +3.3V
VCC EN1 EN2 EN3 EN4
MAX16029
RESET CDLY1 CDLY2 CDLY3 CDLY4 CRESET GND TOL TH0 TH1 MR
SYSTEM RESET
Figure 5. Multiple-Voltage Sequencing Using n-Channel FETs
12 ______________________________________________________________________________________
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits
Pin Configurations (continued)
TOP VIEW
RESET RESET OUT1 OUT2 OUT1 OUT2 OUT3 TH0 TH0
MAX16025–MAX16030
12
11
10
9
15 MR 16 CRESET 17 CDLY3 18 6 5 EN1 CDLY2 19 GND CDLY1 20
14
13
12
11 10 9 TH1 EN3 EN2 EN1 GND
MR 13 CRESET 14 CDLY2 15 CDLY1 16
8 7
TH1 EN2
MAX16025 MAX16026
MAX16027 MAX16028
8 7 6
+
1 VCC
2 IN1
3 IN2
4 TOL
+
1 VCC
2 IN1
3 IN2
4 IN3
5 TOL
THIN QFN (4mm x 4mm)
THIN QFN (4mm x 4mm)
Chip Information
PROCESS: BICMOS TRANSISTOR COUNT: 3642
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13
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 24L QFN THIN.EPS
PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
E
1 2
14
______________________________________________________________________________________
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
MAX16025–MAX16030
PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
E
2 2
Revision History
Pages changed at Rev 1: 1, 3, 15
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