View MAX16052AUTT_4584887.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-4144; Rev 1; 10/08
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 16V 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 (-40C to +125C).
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 16V o Low Supply Current (18A typ) o Capacitor-Adjustable Delay o Active-High Logic-Enable Input o Fully Specified from -40C to +125C 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 -40C to +125C operating automotive temperature range. +Denotes a lead-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 P 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 = +70C) 6-Pin SOT23 (derate 8.7mW/C above +70C)..........695.7mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 16V, VEN = VCC, TA = TJ = -40C to +125C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +25C.) (Note 1)
PARAMETER SUPPLY Operating Voltage Range Undervoltage Lockout VCC UVLO VCC falling (Note 2) 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) VCC 1.2V, ISINK = 90A VOL VCC 2.25V, ISINK = 0.5mA VCC > 4.5V, ISINK = 1mA VOH ILKG VCC 2.25V, ISOURCE = 500A VCC 4.5V, ISOURCE = 800A Output not asserted low, VOUT = 28V 0.8 x VCC 0.9 x VCC 150 0.2 0.3 0.4 V nA V VIL VIH ILEAK VEN = 0V or VCC 1.4 -55 +15 +55 0.5 V V nA ICD VTCD RCDELAY VCDELAY = 0V VCDELAY rising VCC 2.25V, ISINK = 200A VCC 3.3V, ISINK = 1mA 200 0.95 250 1.00 15 15 300 1.05 60 60 nA V VTH VHYST IIN VIN rising, 2.25V VCC 16V VIN falling VIN = 0 or 16V -40 0.491 0.500 5 +5 +60 0.509 V mV nA VCC = 3.3V VCC = 12V VCC = 3.3V VCC = 12V 2.25 1.8 18 23 22 29 16 2 37 45 47 57 A V V SYMBOL CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
High-Voltage, Adjustable Sequencing/Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.25V to 16V, VEN = VCC, TA = TJ = -40C to +125C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +25C.) (Note 1)
PARAMETER TIMING MAX16052, 100k pullup resistor, CCDELAY = 0 VCC = 3.3V, VIN rising, VIN = VTH + 25mV tDELAY IN to OUT Propagation Delay MAX16053, CCDELAY = 0 MAX16052, 100k pullup resistor, CCDELAY = 0.047F MAX16053, CCDELAY = 0.047F MAX16052, 100k pullup resistor, CCDELAY = 0 MAX16053, CCDELAY = 0 30 s 30 SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX16052/MAX16053
190 ms 190
VCC = 12V, VIN rising, VIN = VTH + 25mV
30 s
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 s ns
EN to OUT Delay
tOFF
From device enabled to device disabled
MAX16052, 100k pullup resistor MAX16053 MAX16052, 100k 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 s ns
EN to OUT Delay
tPROP
From device disabled to device enabled
MAX16052, 100k pullup resistor, CCDELAY = 0.047F MAX16053, CCDELAY = 0.047F
Note 1: All devices are production tested at TA = +25C. 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 VULCO
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 = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16052/53 toc01
MAX16052/MAX16053
SUPPLY CURRENT vs. TEMPERATURE
27 24 21 ICC (A) 18 15 12 9 6 VCC = 3.3V VCC = 2.25V VCC = 5V VCC = 12V MAX16052
MAX16052/53 toc02
30 27 24 21 ICC (A) 18 15 12 9 6 3 0 0 2 4 6 8 VCC (V) 10 12 14 MAX16052
30
3 0 16 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
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
8 7 OUTPUT LOW VOLTAGE (V) 6 5 4 3 2 1 0 0 2 4 6 8 VCC = 2.25V VCC = 3.3V VCC = 12V VCC = 5V
12 10 OUTPUT HIGH VOLTAGE (V) 8 6 4 2 0
10 12 14 16 18 20
0
2
4
6
8
10
12
14
ISINK (mA)
ISOURCE (mA)
_______________________________________________________________________________________
5
High-Voltage, Adjustable Sequencing/Supervisory Circuits MAX16052/MAX16053
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
MAXIMUM TRANSIENT DURATION vs. INPUT OVERDRIVE
MAXIMUM TRANSIENT DURATION (s)
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
10s/div
400ns/div
INPUT OVERDRIVE (mV)
IN LEAKAGE CURRENT vs. TEMPERATURE
MAX16052/53 toc10
IN LEAKAGE CURRENT vs. IN VOLTAGE
8 IN LEAKAGE CURRENT (nA) 6 4 2 0 -2 -4 -6 VCC = 16V VCC = VEN 0 2 4 6 8 10 12 14 16
MAX16052/53 toc11
10 9 IN LEAKAGE CURRENT (mA) 8 7 6 5 4 3 2 1 0 VCC = 16V VCC = VEN = VIN
10
-8 -10 IN VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
6
_______________________________________________________________________________________
High-Voltage, Adjustable Sequencing/Supervisory Circuits
Typical Operating Characteristics (continued)
(VCC = 3.3V and TA = +25C, unless otherwise noted.)
MAX16052/MAX16053
EN LEAKAGE CURRENT vs. TEMPERATURE
MAX16052/53 toc12
EN LEAKAGE CURRENT vs. EN VOLTAGE
8 EN LEAKAGE CURRENT (nA) 6 4 2 0 -2 -4 -6 VCC = 16V VCC = VIN 0 2 4 6 8 10 12 14 16
MAX16052/53 toc13
10 9 EN LEAKAGE CURRENT (nA) 8 7 6 5 4 3 2 1 0 VCC = 16V VCC = VEN = VIN
10
-8 -10 EN VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
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 16V supply to VCC to power the device. For noisy systems, bypass with a 0.1F 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) + 30s. For EN rising, tPROP = (CCDELAY x 4.0 x 106) + 14s.
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 16V. 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 0.1F 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 18s 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 x 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: tDELAY = CCDELAY x (4 x 106 ) + (30s) 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 56k. For a 12V pullup, the resistor should be larger than 24k. 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; 100k 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: tPROP = CCDELAY x (4 x 106 ) + (14s) 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
100k
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 (200k 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 0.1F 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, go to www.maxim-ic.com/packages. 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. DESCRIPTION PAGES CHANGED -- 8, 10
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 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

▲Up To Search▲

Price & Availability of MAX16052AUTT

	To Download MAX16052AUTT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .