MAX16053

19-4144; Rev 2; 1/10 High-Voltage, Adjustable Sequencing/Supervisory Circuits General Description The MAX16052/MAX16053 are a family of small, lowpower, high-voltage monitoring circuits with sequencing capability. These miniature devices offer very wide flexibility with an adjustable voltage threshold and an external capacitor-adjustable time delay. These devices are ideal for use in power-supply sequencing, reset sequencing, and power switching applications. Multiple devices can be cascaded for complex sequencing applications. A high-impedance input (IN) with a 0.5V threshold allows an external resistive divider to set the monitored threshold. The output (OUT) asserts high when the input voltage rises above the 0.5V threshold and the enable input (EN) is asserted high. When the voltage at IN falls below 0.495V or when the enable input is deasserted (EN = low), the output deasserts (OUT = low). The MAX16052/MAX16053 provide a capacitor programmable delay time from when the voltage at IN rises above 0.5V to when the output is asserted. The MAX16052 offers an active-high open-drain output while the MAX16053 offers an active-high push-pull output. Both devices operate from a 2.25V to 28V supply voltage and feature an active-high enable input. The MAX16052/MAX16053 are available in a tiny 6-pin SOT23 package and are fully specified over the automotive temperature range (-40°C to +125°C). Features o 1.8% Accurate Adjustable Threshold Over Temperature o Open-Drain (28V Tolerant) Output Allows Interfacing to 12V Intermediate Bus Voltage o Operates from VCC of 2.25V to 28V o Low Supply Current (18µA typ) o Capacitor-Adjustable Delay o Active-High Logic-Enable Input o Fully Specified from -40°C to +125°C o Small 6-Pin SOT23 Package MAX16052/MAX16053 Ordering Information PART MAX16052AUT+T MAX16053AUT+T OUTPUT Open-Drain Push-Pull PINPACKAGE 6 SOT23 6 SOT23 TOP MARK +ACLW +ACLX Note: All devices operate over the -40°C to +125°C operating automotive temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel, offered in 2.5k increments. Pin Configuration TOP VIEW 1 EN CDELAY 6 Applications Automotive Medical Equipment Intelligent Instruments Portable Equipment Computers/Servers Critical µP Monitoring Set-Top Boxes Telecom 2 GND MAX16053 MAX16052 VCC 5 3 IN OUT 4 SOT23 Typical Operating Circuit DC-DC CONVERTER 12V EN VCC IN EN VCC IN MAX16052 OUT CDELAY EN DC-DC CONVERTER OUT 0.9V IN MAX16052 OUT CDELAY GND GND ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. High-Voltage, Adjustable Sequencing/Supervisory Circuits MAX16052/MAX16053 ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC .........................................................................-0.3V to +30V OUT (push-pull, MAX16053) ......................-0.3V to (VCC + 0.3V) OUT (open-drain, MAX16052)................................-0.3V to +30V EN, IN .........................................................-0.3V to (VCC + 0.3V) CDELAY....................................................................-0.3V to +6V Input/Output Current (all pins)..........................................±20mA Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C)..........695.7mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°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 = 2.25V to 28V, VEN = VCC, TA = TJ = -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 SYMBOL VCC UVLO CONDITIONS MIN 2.25 1.8 VCC = 3.3V MAX16052, no load VCC Supply Current ICC MAX16053, no load IN Threshold Voltage Hysteresis Input Current CDELAY CDELAY Charge Current CDELAY Threshold CDELAY Pulldown Resistance EN EN Low Voltage EN High Voltage EN Leakage Current OUT OUT Low Voltage (Open-Drain or Push-Pull) OUT High Voltage (Push-Pull, MAX16053) OUT Leakage Current (Open-Drain, MAX16052) VIL VIH ILEAK VEN = 0 or 28V VCC ≥ 1.2V, ISINK = 90µA VOL VCC ≥ 2.25V, ISINK = 0.5mA VCC > 4.5V, ISINK = 1mA VCC ≥ 2.25V, ISOURCE = 500µA VCC ≥ 4.5V, ISOURCE = 800µA Output not asserted low, VOUT = 28V 0.8 x VCC 0.9 x VCC 150 1.4 -110 +20 +110 0.2 0.3 0.4 V nA V 0.5 V V nA VCC = 12V VCC = 28V VCC = 3.3V VCC = 12V VCC = 28V VTH VHYST IIN ICD VTCD RCDELAY VIN rising, 2.25V ≤ VCC ≤ 28V VIN falling VIN = 0 or 28V VCDELAY = 0V VCDELAY rising VCC ≥ 2.25V, ISINK = 200µA VCC ≥ 3.3V, ISINK = 1mA -110 200 0.95 0.491 18 23 38 22 29 44 0.500 5 +25 250 1.00 15 15 +110 300 1.05 60 60 TYP MAX 28 2 37 45 61 47 57 71 0.509 V mV nA nA V Ω µA UNITS V V VCC falling (Note 2) VOH ILKG 2 _______________________________________________________________________________________ High-Voltage, Adjustable Sequencing/Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued) (VCC = 2.25V to 28V, VEN = VCC, TA = TJ = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +25°C.) (Note 1) PARAMETER TIMING MAX16052, 100kΩ pullup resistor, CCDELAY = 0 VCC = 3.3V, VIN rising, VIN = VTH + 25mV tDELAY IN to OUT Propagation Delay MAX16053, CCDELAY = 0 MAX16052, 100kΩ pullup resistor, CCDELAY = 0.047µF MAX16053, CCDELAY = 0.047µF MAX16052, 100kΩ pullup resistor, CCDELAY = 0 MAX16053, CCDELAY = 0 30 µs 30 SYMBOL CONDITIONS MIN TYP MAX UNITS MAX16052/MAX16053 190 ms 190 VCC = 12V, VIN rising, VIN = VTH + 25mV 30 µs 30 18 18 0.5 0.5 1 100 tDL Startup Delay (Note 3) EN Minimum Input Pulse Width EN Glitch Rejection tMPW VCC = 3.3V, VIN falling, VIN = VTH - 30mV VCC = 12V, VIN falling, VIN = VTH - 30mV VCC = 2.25V, VIN = 0.525V, CCDELAY = 0 VCC = 12V, VIN = 12V, CCDELAY = 0 ms µs ns EN to OUT Delay tOFF From device enabled to device disabled MAX16052, 100kΩ pullup resistor MAX16053 MAX16052, 100kΩ pullup resistor, CCDELAY = 0 MAX16053, CCDELAY = 0 VCC = 3.3V VCC = 12V VCC = 3.3V VCC = 12V VCC = 3.3V VCC = 12V VCC = 3.3V VCC = 12V 250 300 350 400 14 14 14 14 190 ms 190 µs ns EN to OUT Delay tPROP From device disabled to device enabled MAX16052, 100kΩ pullup resistor, CCDELAY = 0.047µF MAX16053, CCDELAY = 0.047µF Note 1: All devices are production tested at TA = +25°C. Limits over temperature are guaranteed by design. Note 2: When VCC falls below the UVLO threshold, the outputs deassert (OUT goes low). When VCC falls below 1.2V, the output state cannot be determined. Note 3: During the initial power-up, VCC must exceed 2.25V for at least 0.5ms before OUT can go high. _______________________________________________________________________________________ 3 High-Voltage, Adjustable Sequencing/Supervisory Circuits MAX16052/MAX16053 VCC VUVLO VTH + 25mV IN VTH - VHYST VTH t < tPROP EN VIH VIL t < tMPW VIH VIL VIH 5% VIH t > tMPW VOH OUT VOL tPROP tDL tDELAY tOFF tPROP Figure 1. MAX16052/MAX16053 Timing Diagram (CCDELAY = 0) 4 _______________________________________________________________________________________ High-Voltage, Adjustable Sequencing/Supervisory Circuits Typical Operating Characteristics (VCC = 3.3V and TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX16052/53 toc01 MAX16052/MAX16053 SUPPLY CURRENT vs. TEMPERATURE 40 36 32 ICC (µA) 28 24 20 16 12 8 4 VCC = 2.25V -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) VCC = 5V VCC = 3.3V VCC = 12V VCC = 28V MAX16052 MAX16052/53 toc02 33 30 27 24 21 ICC (µA) 18 15 12 9 6 3 0 0 4 8 12 16 20 24 MAX16052 VIN = 0V 44 28 VCC (V) IN THRESHOLD VOLTAGE vs. TEMPERATURE MAX16052/53 toc03 OUT DELAY vs. CCDELAY 4500 4000 OUT DELAY (ms) 3500 3000 2500 2000 1500 MAX16052/53 toc04 502.0 501.5 IN THRESHOLD VOLTAGE (mV) 501.0 500.5 500.0 499.5 499.0 498.5 498.0 5000 1000 500 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 0 100 200 300 400 500 600 700 800 900 1000 CCDELAY (nF) OUTPUT LOW VOLTAGE vs. SINK CURRENT MAX16052/53 toc05 OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT MAX16052/53 toc06 2.5 VCC = 28V OUTPUT LOW VOLTAGE (V) 2.0 VCC = 12V VCC = 5V 1.0 0.5 VCC = 3.3V VCC = 2.25V 30 25 OUTPUT HIGH VOLTAGE (V) VCC = 28V 20 VCC = 5V 15 10 VCC = 2.25V 5 0 VCC = 3.3V VCC = 12V 1.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 ISINK (mA) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 ISOURCE (mA) _______________________________________________________________________________________ 5 High-Voltage, Adjustable Sequencing/Supervisory Circuits MAX16052/MAX16053 Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) MAXIMUM TRANSIENT DURATION vs. INPUT OVERDRIVE MAXIMUM TRANSIENT DURATION (µs) MAX16052/53 toc07 ENABLE TURN-ON DELAY (MAX16053) MAX16052/53 toc08 ENABLE TURN-OFF DELAY (MAX16053) MAX16052/53 toc09 300 250 200 150 100 50 0 1 10 100 RESET OCCURS ABOVE THIS CURVE EN 2V/div EN 2V/div OUT 2V/div OUT 2V/div 1000 10µs/div 400ns/div INPUT OVERDRIVE (mV) IN LEAKAGE CURRENT vs. TEMPERATURE MAX16052/53 toc10 IN LEAKAGE CURRENT vs. IN VOLTAGE VCC = 28V VCC = VEN IN LEAKAGE CURRENT (nA) 0 MAX16052/53 toc11 10 8 IN LEAKAGE CURRENT (mA) 6 4 2 0 -2 -4 -6 -8 -10 VCC = 28V VCC = VEN = VIN 1 -1 -2 -3 -4 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 VIN (V) 6 _______________________________________________________________________________________ High-Voltage, Adjustable Sequencing/Supervisory Circuits Typical Operating Characteristics (continued) (VCC = 3.3V and TA = +25°C, unless otherwise noted.) MAX16052/MAX16053 EN LEAKAGE CURRENT vs. TEMPERATURE MAX16052/53 toc12 EN LEAKAGE CURRENT vs. IN VOLTAGE 0.8 EN LEAKAGE CURRENT (nA) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 VCC = 28V VCC = VIN MAX16052/53 toc13 10 8 EN LEAKAGE CURRENT (nA) 6 4 2 0 -2 -4 -6 -8 -10 VCC = 28V VCC = VEN = VIN 1.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 VEN (V) Pin Description PIN 1 2 3 NAME EN GND IN FUNCTION Active-High Logic-Enable Input. Drive EN low to immediately deassert the output to its false state (OUT = low) independent of VIN. With VIN above VTH, drive EN high to assert the output to its true state (OUT = high) after the adjustable delay period. Connect EN to VCC, if not used. Ground High-Impedance Monitor Input. Connect IN to an external resistive divider to set the desired monitor threshold. The output changes state when VIN rises above 0.5V and when VIN falls below 0.495V. Active-High Sequencer/Monitor Output. Open-drain (MAX16052) or push-pull (MAX16053). OUT is asserted to its true state (OUT = high) when VIN is above VTH and the enable input is in its true state (EN = high) after the capacitor-adjusted delay period. OUT is deasserted to its false state (OUT = low) immediately after VIN drops below 0.495V or the enable input is in its false state (EN = low). The MAX16052 open-drain output requires an external pullup resistor. Supply Voltage Input. Connect a 2.25V to 28V supply to VCC to power the device. For noisy systems, bypass with a 0.1µF ceramic capacitor to GND. Capacitor-Adjustable Delay Input. Connect an external capacitor (CCDELAY) from CDELAY to GND to set the IN-to-OUT and EN-to-OUT delay period. For VIN rising, tDELAY = (CCDELAY x 4.0 x 106) + 30µs. For EN rising, tPROP = (CCDELAY x 4.0 x 106) + 14µs. 4 OUT 5 VCC 6 CDELAY _______________________________________________________________________________________ 7 High-Voltage, Adjustable Sequencing/Supervisory Circuits MAX16052/MAX16053 VCC VCC REF IN 0.5V EN INTERNAL VCC/UVLO OUT CONTROL LOGIC GND EN IN 0.5V REF INTERNAL VCC/UVLO CONTROL LOGIC OUT 250nA 1.0V 250nA 1.0V GND MAX16052 MAX16053 CDELAY CDELAY Figure 2. Simplified Functional Diagram Detailed Description The MAX16052/MAX16053 family of high-voltage, sequencing/supervisory circuits provide adjustable voltage monitoring for inputs down to 0.5V. These devices are ideal for use in power-supply sequencing, reset sequencing, and power-switching applications. Multiple devices can be cascaded for complex sequencing applications. The MAX16052/MAX16053 perform voltage monitoring using a high-impedance input (IN) with an internally fixed 0.5V threshold. When the voltage at IN falls below 0.5V or when the enable input is deasserted (EN = low) OUT goes low. When VIN rises above 0.5V and the enable input is asserted (EN = high), OUT goes high after a capacitor-adjustable time delay. With VIN above 0.5V, the enable input can be used to turn on or off the output. Table 1 details the output state depending on the various input and enable conditions. Table 1. MAX16052/MAX16053 IN VIN < VTH VIN < VTH VIN > VTH VIN > VTH EN Low High Low High OUT Low Low Low OUT = High Impedance (MAX16052) OUT = VCC (MAX16053) Supply Input (VCC) The device operates with a VCC supply voltage from 2.25V to 28V. In order to maintain a 1.8% accurate threshold at IN, VCC must be above 2.25V. When VCC falls below the UVLO threshold, the output deasserts low. When VCC falls below 1.2V, the output state is not guaranteed. For noisy systems, connect a 0.1µF ceramic capacitor from VCC to GND as close to the device as possible. 8 _______________________________________________________________________________________ High-Voltage, Adjustable Sequencing/Supervisory Circuits Monitor Input (IN) Connect the center point of a resistive divider to IN to monitor external voltages (see R1 and R2 of Figure 4). IN has a rising threshold of VTH = 0.5V and a falling threshold of 0.495V (5mV hysteresis). When VIN rises above VTH and EN is high, OUT goes high after the adjustable tDELAY period. When VIN falls below 0.495V, OUT goes low after a 18µs delay. IN has a maximum input current of 60nA, so large value resistors are permitted without adding significant error to the resistive divider. additional variation in threshold, for example) and calculate R1 based on the desired monitored voltage using the following formula: ⎡V ⎤ R1 = R2 × ⎢ MONITOR − 1⎥ VTH ⎣ ⎦ where VMONITOR is the desired monitored voltage and VTH is the reset input threshold (0.5V). MAX16052/MAX16053 Adjustable Delay (CDELAY) When VIN rises above VTH with EN high, the internal 250nA current source begins charging an external capacitor connected from CDELAY to GND. When the voltage at CDELAY reaches 1V, the output asserts (OUT goes high). When the output asserts, CCDELAY is immediately discharged. Adjust the delay (tDELAY) from when VIN rises above VTH (with EN high) to OUT going high according to the equation: t DELAY = C CDELAY × (4 × 10 6 Ω) + (30µ s) where tDELAY is in seconds and CCDELAY is in Farads. Pullup Resistor Values (MAX16052 Only) The exact value of the pullup resistor for the open-drain output 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. Ensuring a Valid OUT Down to VCC = 0V (Push-Pull OUT) In applications in which OUT must be valid down to VCC = 0V, add a pulldown resistor between OUT and GND for the push-pull output (MAX16053). The resistor sinks any stray leakage currents, holding OUT low (Figure 3). The value of the pulldown resistor is not critical; 100kΩ is large enough not to load OUT and small enough to pull OUT to ground. The external pulldown cannot be used with the open-drain OUT output. VCC Enable Input (EN) The MAX16052/MAX16053 offer an active-high enable input (EN). With VIN above VTH, drive EN high to force OUT high after the capacitor-adjustable delay time. The EN-to-OUT delay time (tPROP) can be calculated from when EN goes above the EN threshold using the equation: t PROP = C CDELAY × (4 × 10 6 Ω) + (14µ s) where tPROP is in seconds and CCDELAY is in Farads. Drive EN low to force OUT low within 300ns for the MAX16052 and within 400ns for the MAX16053. VCC OUT Output (OUT) The MAX16052 offers an active-high, open-drain output while the MAX16053 offers an active-high push-pull output. The push-pull output is referenced to VCC. The open-drain output requires a pullup resistor and can be pulled up to 28V. MAX16053 100kΩ Applications Information Input Threshold The MAX16052/MAX16053 monitor the voltage on IN with an external resistive divider (Figure 4). R1 and R2 can have very high values to minimize current consumption due to low IN leakage currents (60nA max). Set R2 to some conveniently high value (200kΩ for ±1% GND Figure 3. Ensuring OUT Valid to VCC = 0V _______________________________________________________________________________________ 9 High-Voltage, Adjustable Sequencing/Supervisory Circuits MAX16052/MAX16053 Typical Application Circuits Figures 4–6 show typical applications for the MAX16052/MAX16053. Figure 4 shows the MAX16052 used with a p-channel MOSFET in an overvoltage protection circuit. Figure 5 shows the MAX16053 in a lowvoltage sequencing application using an n-channel MOSFET. Figure 6 shows the MAX16053 used in a multiple output sequencing application. a lower drain-to-source on-resistance. However, an nchannel MOSFET requires a sufficient VGS voltage to fully enhance it for a low R DS_ON . The application shown in Figure 5 shows the MAX16053 in a switch sequencing application using an n-channel MOSFET. Similarly, if a higher voltage is present in the system, the open-drain version can be used in the same manner. Power-Supply Bypassing In noisy applications, bypass VCC to ground with a 0.1µF capacitor as close to the device as possible. The additional capacitor improves transient immunity. For fast-rising VCC transients, additional capacitors may be required. Using an n-Channel Device for Sequencing In higher power applications, using an n-channel device reduces the loss across the MOSFET as it offers 3.3V ALWAYS-ON 5V BUS P 0 TO 28V RPULLUP EN R1 VCC OUT R1 OUT MONITORED 3.3V EN VCC 1.2V INPUT N 1.2V OUTPUT MAX16053 MAX16052 IN CDELAY R2 GND CCDELAY GND IN CDELAY CCDELAY R2 Figure 4. Overvoltage Protection Figure 5. Low-Voltage Sequencing Using an n-Channel MOSFET 10 ______________________________________________________________________________________ High-Voltage, Adjustable Sequencing/Supervisory Circuits MAX16052/MAX16053 3.3V 2.5V 1.8V 1.2V 5V BUS DC-DC DC-DC DC-DC DC-DC EN EN EN EN SYSTEM ENABLE EN VCC EN VCC EN VCC EN VCC IN MAX16053 IN OUT MAX16053 IN OUT MAX16053 IN OUT MAX16053 OUT GND CCDELAY GND CCDELAY GND CCDELAY GND CCDELAY Figure 6. Multiple Output Sequencing Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 6 SOT23 PACKAGE CODE U6+1 DOCUMENT NO. 21-0058 ______________________________________________________________________________________ 11 High-Voltage, Adjustable Sequencing/Supervisory Circuits MAX16052/MAX16053 Revision History REVISION NUMBER 0 1 REVISION DATE 5/08 10/08 Initial release Update Adjustable Delay (CDELAY) and Power-Supply Bypassing sections. Revised the Features, General Description, Absolute Maximum Ratings, Electrical Characteristics, Typical Operating Characteristics, and the Supply Input (VCC) sections. DESCRIPTION PAGES CHANGED — 9, 10 2 1/10 1, 2, 5–8 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.