19-4144; Rev 2; 1/10 High-Voltage, Adjustable Sequencing/Supervisory Circuits 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 Ordering Information Computers/Servers Medical Equipment Critical µP Monitoring Intelligent Instruments Set-Top Boxes Portable Equipment Telecom TOP MARK Open-Drain 6 SOT23 +ACLW Push-Pull 6 SOT23 +ACLX OUTPUT MAX16052AUT+T MAX16053AUT+T 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 Applications Automotive PINPACKAGE PART 1 EN CDELAY 6 2 GND MAX16053 VCC 5 3 IN OUT 4 MAX16052 SOT23 Typical Operating Circuit DC-DC CONVERTER 12V VCC EN VCC EN IN IN MAX16052 OUT CDELAY GND EN OUT 0.9V IN MAX16052 DC-DC CONVERTER OUT CDELAY GND ________________________________________________________________ Maxim Integrated Products 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. 1 MAX16052/MAX16053 General Description MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits 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 VCC Supply Current ICC MAX16053, no load IN Threshold Voltage Hysteresis Input Current CDELAY CDELAY Charge Current CDELAY Threshold CDELAY Pulldown Resistance VTH VHYST TYP MAX UNITS V V VCC = 3.3V 18 28 2 37 VCC = 12V 23 45 VCC = 28V VCC = 3.3V 38 22 61 47 VCC = 12V 29 57 VCC = 28V 44 71 0.500 0.509 2.25 1.8 VCC falling (Note 2) MAX16052, no load MIN VIN rising, 2.25V ≤ VCC ≤ 28V 0.491 VIN falling 5 IIN VIN = 0 or 28V ICD VCDELAY = 0V 200 VTCD VCDELAY rising 0.95 RCDELAY -110 +25 µA V mV +110 nA 250 300 nA 1.00 1.05 V VCC ≥ 2.25V, ISINK = 200µA 15 60 VCC ≥ 3.3V, ISINK = 1mA 15 60 Ω EN EN Low Voltage VIL EN High Voltage VIH EN Leakage Current OUT ILEAK OUT Low Voltage (Open-Drain or Push-Pull) VOL OUT High Voltage (Push-Pull, MAX16053) VOH OUT Leakage Current (Open-Drain, MAX16052) ILKG 2 0.5 1.4 VEN = 0 or 28V -110 V V +20 +110 VCC ≥ 1.2V, ISINK = 90µA 0.2 VCC ≥ 2.25V, ISINK = 0.5mA 0.3 VCC > 4.5V, ISINK = 1mA VCC ≥ 2.25V, ISOURCE = 500µA 0.4 0.8 x VCC VCC ≥ 4.5V, ISOURCE = 800µA 0.9 x VCC Output not asserted low, VOUT = 28V _______________________________________________________________________________________ nA V V 150 nA High-Voltage, Adjustable Sequencing/Supervisory Circuits (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 SYMBOL CONDITIONS MIN TYP MAX UNITS TIMING VCC = 3.3V, VIN rising, VIN = VTH + 25mV tDELAY IN to OUT Propagation Delay VCC = 12V, VIN rising, VIN = VTH + 25mV tDL Startup Delay (Note 3) EN Minimum Input Pulse Width MAX16052, 100kΩ pullup resistor, CCDELAY = 0 30 MAX16053, CCDELAY = 0 30 MAX16052, 100kΩ pullup resistor, CCDELAY = 0.047µF 190 MAX16053, CCDELAY = 0.047µF 190 MAX16052, 100kΩ pullup resistor, CCDELAY = 0 30 MAX16053, CCDELAY = 0 30 EN to OUT Delay ms VCC = 3.3V, VIN falling, VIN = VTH - 30mV 18 VCC = 12V, VIN falling, VIN = VTH - 30mV 18 VCC = 2.25V, VIN = 0.525V, CCDELAY = 0 0.5 VCC = 12V, VIN = 12V, CCDELAY = 0 0.5 tMPW 1 EN Glitch Rejection EN to OUT Delay µs tOFF tPROP From device disabled to device enabled MAX16052, 100kΩ pullup resistor MAX16053 MAX16052, 100kΩ pullup resistor, CCDELAY = 0 MAX16053, CCDELAY = 0 ms µs 100 From device enabled to device disabled µs VCC = 3.3V 250 VCC = 12V 300 VCC = 3.3V 350 VCC = 12V 400 VCC = 3.3V 14 VCC = 12V 14 VCC = 3.3V 14 VCC = 12V 14 MAX16052, 100kΩ pullup resistor, CCDELAY = 0.047µF 190 MAX16053, CCDELAY = 0.047µF 190 ns ns µs ms 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 MAX16052/MAX16053 ELECTRICAL CHARACTERISTICS (continued) MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits VCC VUVLO VTH + 25mV VTH - VHYST IN VTH t < tPROP EN VIH VIH VIH VIH 5% VIL VIL t < tMPW t > tMPW VOH OUT VOL tPROP tDL tDELAY tOFF Figure 1. MAX16052/MAX16053 Timing Diagram (CCDELAY = 0) 4 _______________________________________________________________________________________ tPROP High-Voltage, Adjustable Sequencing/Supervisory Circuits SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. TEMPERATURE 27 24 36 32 ICC (µA) ICC (µA) MAX16052 40 21 18 15 VCC = 28V 28 VCC = 12V 24 12 20 9 16 6 3 12 0 4 VCC = 5V VCC = 3.3V 8 0 4 8 12 16 20 24 28 VCC = 2.25V -40 -25 -10 5 20 35 50 65 80 95 110 125 VCC (V) TEMPERATURE (°C) IN THRESHOLD VOLTAGE vs. TEMPERATURE OUT DELAY vs. CCDELAY 501.5 4500 4000 OUT DELAY (ms) 501.0 500.5 500.0 499.5 MAX16052/53 toc04 5000 MAX16052/53 toc03 502.0 3500 3000 2500 2000 1500 499.0 1000 498.5 500 0 498.0 0 100 200 300 400 500 600 700 800 900 1000 -40 -25 -10 5 20 35 50 65 80 95 110 125 CCDELAY (nF) OUTPUT LOW VOLTAGE vs. SINK CURRENT OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT OUTPUT LOW VOLTAGE (V) VCC = 28V 2.0 VCC = 12V 1.5 VCC = 5V 1.0 VCC = 3.3V VCC = 2.25V 0.5 30 25 OUTPUT HIGH VOLTAGE (V) 2.5 MAX16052/53 toc05 TEMPERATURE (°C) MAX16052/53 toc06 IN THRESHOLD VOLTAGE (mV) MAX16052/53 toc02 MAX16052 VIN = 0V 30 44 MAX16052/53 toc01 33 VCC = 28V 20 VCC = 12V VCC = 5V 15 VCC = 3.3V 10 VCC = 2.25V 5 0 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 MAX16052/MAX16053 Typical Operating Characteristics (VCC = 3.3V and TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) MAXIMUM TRANSIENT DURATION vs. INPUT OVERDRIVE ENABLE TURN-ON DELAY (MAX16053) ENABLE TURN-OFF DELAY (MAX16053) MAX16052/53 toc08 MAX16052/53 toc07 300 MAXIMUM TRANSIENT DURATION (µs) 250 MAX16052/53 toc09 EN 2V/div 200 EN 2V/div RESET OCCURS ABOVE THIS CURVE 150 OUT 2V/div OUT 2V/div 100 50 0 10 1 100 1000 10µs/div 400ns/div INPUT OVERDRIVE (mV) IN LEAKAGE CURRENT vs. TEMPERATURE 6 4 2 0 -2 -4 -6 1 MAX16052/53 toc11 VCC = 28V VCC = VEN = VIN VCC = 28V VCC = VEN IN LEAKAGE CURRENT (nA) 8 IN LEAKAGE CURRENT vs. IN VOLTAGE MAX16052/53 toc10 10 IN LEAKAGE CURRENT (mA) MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits 0 -1 -2 -3 -8 -10 6 -4 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 TEMPERATURE (°C) VIN (V) _______________________________________________________________________________________ High-Voltage, Adjustable Sequencing/Supervisory Circuits EN LEAKAGE CURRENT vs. IN VOLTAGE VCC = 28V VCC = VEN = VIN 6 4 2 0 -2 -4 1.0 0.8 MAX16052/53 toc13 EN LEAKAGE CURRENT (nA) 8 EN LEAKAGE CURRENT (nA) 10 MAX16052/53 toc12 EN LEAKAGE CURRENT vs. TEMPERATURE VCC = 28V VCC = VIN 0.6 0.4 0.2 0 -0.2 -0.4 -6 -0.6 -8 -0.8 -1.0 -10 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 TEMPERATURE (°C) VEN (V) Pin Description PIN NAME 1 EN 2 GND 3 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. 4 OUT 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. 5 VCC 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. 6 CDELAY 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. _______________________________________________________________________________________ 7 MAX16052/MAX16053 Typical Operating Characteristics (continued) (VCC = 3.3V and TA = +25°C, unless otherwise noted.) MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits VCC REF VCC INTERNAL VCC/UVLO REF IN OUT 0.5V INTERNAL VCC/UVLO IN 0.5V CONTROL LOGIC EN GND CONTROL LOGIC EN OUT 250nA 250nA 1.0V 1.0V MAX16052 GND 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. 8 Table 1. MAX16052/MAX16053 IN EN OUT VIN < VTH Low Low VIN < VTH High Low VIN > VTH Low Low VIN > VTH High 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. _______________________________________________________________________________________ High-Voltage, Adjustable Sequencing/Supervisory Circuits 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. 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. 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). 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 VCC 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. OUT 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 MAX16052/MAX16053 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. MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits 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. 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 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. 3.3V ALWAYS-ON 5V BUS 1.2V INPUT N 1.2V OUTPUT P 0 TO 28V MONITORED 3.3V RPULLUP EN EN VCC VCC R1 OUT R1 OUT MAX16053 MAX16052 IN IN CDELAY R2 R2 GND Figure 4. Overvoltage Protection 10 CDELAY CCDELAY GND CCDELAY Figure 5. Low-Voltage Sequencing Using an n-Channel MOSFET ______________________________________________________________________________________ High-Voltage, Adjustable Sequencing/Supervisory Circuits DC-DC 5V BUS DC-DC EN 1.2V 1.8V DC-DC DC-DC EN EN EN SYSTEM ENABLE EN VCC EN IN VCC EN IN MAX16053 OUT CCDELAY EN IN MAX16053 OUT VCC IN MAX16053 MAX16053 OUT GND GND GND VCC CCDELAY OUT GND CCDELAY 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 PACKAGE CODE DOCUMENT NO. 6 SOT23 U6+1 21-0058 ______________________________________________________________________________________ 11 MAX16052/MAX16053 2.5V 3.3V MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits Revision History REVISION NUMBER REVISION DATE 0 5/08 Initial release 1 10/08 Update Adjustable Delay (CDELAY) and Power-Supply Bypassing sections. 2 1/10 Revised the Features, General Description, Absolute Maximum Ratings, Electrical Characteristics, Typical Operating Characteristics, and the Supply Input (VCC) sections. DESCRIPTION PAGES CHANGED — 9, 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.