View MAX508608_4898402.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-3878; Rev 2; 2/08
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay
General Description
The MAX5086 high-voltage linear regulator operates from a 6.5V to 45V input voltage and delivers up to a 250mA output current. The device consumes only 70A of quiescent current with no load and 13A in shutdown. The device includes a SET input, that when connected to ground, selects a preset output voltage of 3.3V (MAX5086A) or 5.0V (MAX5086B). Alternatively, the output voltage can be adjusted from 2.5V to 11V by simply connecting SET to the regulator's output through a resistive divider network. The MAX5086 also provides an open-drain, active-low microprocessor reset output that asserts when the regulator output drops below the preset output voltage threshold. An external capacitor programs the reset timeout period. Other features include an enable input, thermal shutdown, and shortcircuit protection. The MAX5086 operates over the automotive temperature range of -40C to +125C and is available in a 16-pin TQFN thermally enhanced package.
KIT ATION EVALU BLE AVAILA
Features
Wide Operating Input Voltage Range (6.5V to 45V) Thermally Enhanced Package Dissipates 2.6W at TA = +70C (16-Pin TQFN) Guaranteed 250mA Output Current 70A Quiescent Supply Current Preset 3.3V, 5.0V, or Adjustable 2.5V to 11V Output Voltage Remote Load Sense Integrated Microprocessor Reset Circuit with Programmable Timeout Period Thermal and Short-Circuit Protection -40C to +125C Operating Temperature Range
MAX5086
Ordering Information
PART MAX5086AATE+ MAX5086AATE MAX5086BATE+ PINPACKAGE 16 TQFN-EP* 16 TQFN-EP* 16 TQFN-EP* 16 TQFN-EP* OUTPUT VOLTAGE (V) 3.3 3.3 5.0 5.0 PKG CODE T1655-2 T1655-2 T1655-2 T1655-2
Applications
Automotive Industrial Home Security/Safety Networking
MAX5086BATE
Note: All devices are specified over the -40C to +125C operating temperature range. +Denotes lead-free package. *EP = Exposed paddle.
Pin Configuration
TOP VIEW
RESET 10 N.C. SET 9 8 7 GND OUTSENSE
OUT OUT
12 N.C. N.C. N.C. N.C. 13 14 15 16
11
MAX5086
CT
6 5
+
1 N.C.
2 EN
3 IN
4 IN
TQFN
________________________________________________________________ Maxim Integrated Products
1
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.
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086
ABSOLUTE MAXIMUM RATINGS
IN to GND (do not exceed package power dissipation)...............................-0.3V to +50V IN to GND (T 300ms, IOUT 250mA) ..................-0.3V to +42V EN to GND..............................................................-0.3V to +50V RESET, OUT, OUTSENSE to GND .........................-0.3V to +12V CT, SET to GND.....................................................-0.3V to +3.5V IN to OUT................................................................-0.3V to +50V Short-Circuit Duration (VIN < 16V) .............................Continuous Maximum Current into Any Pin (except IN, OUT).............20mA Continuous Power Dissipation (TA = +70C) 16-Pin TQFN (derate 33.3mW/C above +70C) .......2666mW Thermal Resistance (Note 1): (JA, 16-Pin TQFN)....................................................30.0C/W (JC, 16-Pin TQFN).........................................................2C/W Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-60C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7 using a four-layer board. For detailed information on thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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
(VIN = 14V, IOUT = 1mA, CIN = 47F (low ESR), COUT = 15F, VEN = 2.4V, 10k from RESET to OUT, TA = TJ = -40C to +125C, unless otherwise noted. Typical specifications are at TA = +25C.) (Note 2)
PARAMETER Input Voltage Range Supply Current Shutdown Supply Current REGULATOR Guaranteed Output Current IOUT VIN = 6.5V, VOUT = 5.0V SET = GND, 5V Version Output Voltage (Note 3) VOUT SET = GND, 3.3V version 6.5V VIN 25V, 5mA IOUT 250mA 6.5V VIN 45V, 5mA IOUT 100mA 6.5V VIN 25V, 5mA IOUT 250mA 6.5V VIN 45V, 5mA IOUT 100mA 250 4.85 4.85 3.217 3.217 2.5 0.9 400 -1 -0.5 2.4 0.4 +1 +0.8 5 5 3.3 3.3 5.15 5.15 3.392 3.392 11.0 2.2 V s mV/V V V mA SYMBOL VIN IQ ISHDN CONDITIONS VIN VOUT + 1.5V Measured at GND, SET = GND VEN 0.4V IOUT = 0 IOUT = 250mA MIN 6.5 70 1250 13 21 TYP MAX 45 115 UNITS V A A
IOUT = 5mA, adjustable range Dropout Voltage (Note 4) Startup Response Time (Note 5) Line Regulation Enable Voltage VOUT / VIN VEN VDO IOUT = 250mA, VOUT = 5V Rising edge of VIN to VOUT, RL = 500, SET = GND 6.5V VIN 45V 5V version 3.3V version
VEN = high, regulator on VEN = low, regulator off
2
_______________________________________________________________________________________
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 14V, IOUT = 1mA, CIN = 47F (low ESR), COUT = 15F, VEN = 2.4V, 10k from RESET to OUT, TA = TJ = -40C to +125C, unless otherwise noted. Typical specifications are at TA = +25C.) (Note 2)
PARAMETER Enable Input Current SET Reference Voltage SET Input Leakage Current Load Regulation Power-Supply Rejection Ratio Short-Circuit Current (Note 6) Thermal Shutdown Temperature Thermal Shutdown Hysteresis RESET Voltage Threshold RESET Threshold Hysteresis RESET Output Low Voltage RESET Output Leakage Current RESET Output Minimum Timeout Period ENABLE to RESET Minimum Timeout Period Delay Comparator Threshold (Rising) Delay Comparator Threshold Hysteresis CT Charge Current CT Discharge Current 1 SYMBOL IEN VSET ISET VOUT / IOUT PSRR ISC TJ(SHDN) TJ(SHDN) VRESET VRHYST VRL IRH ISINK = 1mA VRESET = 5V When VOUT reaches RESET threshold, CCT = Open When EN goes high, CCT = open 1.196 15 169 1.23 100 2.26 5 4 1.264 89.91 IOUT = 1mA to 250mA IOUT = 10mA, f = 100Hz, 500mVP-P, VOUT = 5V VIN < 16V VEN = 2.4V VEN = 14V 1.20 -100 CONDITIONS MIN TYP 0.38 3.75 1.235 -1.5 0.045 -54 440 175 25 92 2 0.4 1 94.10 1.26 100 0.4 MAX UNITS A V nA dB mA C C % VOUT % VOUT V A s s V mV A mA
MAX5086
Note 2: Note 3: Note 4: Note 5: Note 6:
Limits at -40C are guaranteed by design. Output voltage is tested using a pulsed load current of less than 50ms duration. Dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT for VIN = VOUT + 3V. Startup time measured from 50% of VIN to 90% of VOUT. Continuous short-circuit protection for VIN > 16V not guaranteed.
_______________________________________________________________________________________
3
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086
Typical Operating Characteristics
(VIN = VEN = 14V, CIN = 47F (low ESR), COUT = 15F, VOUT = 5V, SET = GND, TA = +25C, unless otherwise specified.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX5086 toc01
NO-LOAD SUPPLY CURRENT vs. TEMPERATURE
MAX5086 toc02
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
18 16 14 ISHDN (A) 12 10 8 6
MAX5086 toc03
5.5 5.0 4.5 4.0 3.0 2.5 2.0 1.5 1.0 0.5 0 0 5 10 15 20 25 30 35 40 IOUT = 0 3.5 VOUT (V)
160 140 120 IGND (A) 100 80 60 40 20 0 VIN = +6.5V VIN = +45V VIN = +14V
20
4 2 0
45
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
-40 -25 -10 5 20 35 50 65 80 95 110 125 140 TEMPERATURE (C)
VIN (V)
OUTPUT VOLTAGE vs. TEMPERATURE
MAX5086 toc04
GROUND CURRENT vs. TEMPERATURE
MAX5086 toc05
OUTPUT VOLTAGE vs. LOAD CURRENT AND TEMPERATURE
5.20 5.15 5.10 VOUT (V) IOUT = 100mA VIN = +6.5V IOUT = 50mA
MAX5086 toc06
5.25 5.20 5.15 5.10
3.0 VIN = +6.5V 2.5 2.0 IGND (mA) 1.5 1.0 0.5 IOUT = 100mA IOUT = 50mA IOUT = 250mA
5.25
VOUT (V)
5.05 5.00 4.95 4.90 4.85 4.80 4.75 TEMPERATURE (C) IOUT = 5mA
5.05 5.00 4.95 4.90 4.85 4.80
IOUT = 250mA
0 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 TEMPERATURE (C)
4.75 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 TEMPERATURE (C)
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX5086 toc07
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20 PSRR (dB) -30 -40 -50 -60 -70 COUT = 15F IOUT = 10mA
MAX5086 toc08
LOAD-TRANSIENT RESPONSE
MAX5086 toc09
1.50 1.35 1.20 1.05 VDROPOUT (V) 0.90 0.75 0.60 0.45 0.30 0.15 0 0 VOUT = +5V
0
VOUT 200mV/div
IOUT 250mA 5mA
-80 25 50 75 100 125 150 175 200 225 250 IOUT (mA) 0.1 1 10 FREQUENCY (kHz) 100 1000 400s/div
4
_______________________________________________________________________________________
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay
Typical Operating Characteristics (continued)
(VIN = VEN = 14V, CIN = 47F (low ESR), COUT = 15F, VOUT = 5V, SET = GND, TA = +25C, unless otherwise specified.)
MAX5086
INPUT VOLTAGE STEP RESPONSE
MAX5086 toc10
STARTUP RESPONSE
MAX5086 toc11
ENABLE STARTUP RESPONSE
MAX5086 toc12
IOUT = 50mA 0V VOUT AC-COUPLED 500mV/div 0V
IOUT = 5mA EN 1V/div 0V
VOUT 2V/div
0V
26V VIN 10V/div 6.5V 0V
VIN 10V/div 0V 0V VIN = 14V IOUT = 0 100s/div
VOUT 2V/div
400s/div
400s/div
ENABLE STARTUP RESPONSE
MAX5086 toc13
ENABLE STARTUP RESPONSE
MAX5086 toc14
ENABLE STARTUP RESPONSE
MAX5086 toc15
EN 1V/div 0V 0V
EN 1V/div 0V
EN 1V/div
VOUT 2V/div 0V 100s/div VIN = 14V IOUT = 250mA 0V 100s/div VIN = 45V IOUT = 0
VOUT 2V/div 0V 100s/div VIN = 45V IOUT = 250mA
VOUT 2V/div
SHUTDOWN RESPONSE
MAX5086 toc16
GROUND CURRENT DISTRIBUTION (TA = -40C)
MAX5086 toc17
GROUND CURRENT DISTRIBUTION (TA = +125C)
138 UNITS TESTED 35 30 NUMBER OF UNITS 25 20 15 10 5 0 65 66 67 68 69 70 71 72 73 74 IGND (A)
MAX5086 toc18
40 138 UNITS TESTED EN 1V/div NUMBER OF UNITS 35 30 25 20 15 10 5 0
40
0V
IOUT = 5mA
0V VOUT 2V/div
20ms/div
64 65 66 67 68 69 70 71 72 73 74 IGND (A)
_______________________________________________________________________________________
5
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086
Pin Description
PIN 1, 12-16 2 3, 4 5, 6 7 8 9 NAME N.C. EN IN OUT OUTSENSE GND SET No Connection. Not internally connected. Enable Input. Drive EN high to turn on the regulator. Force EN low to place the device in shutdown mode. Regulator Input. Supply voltage ranges from 6.5V to 45V. Bypass IN to GND with a low ESR 47F capacitor (electrolytic 50VL). Regulator Output. Connect at least a 15F low-ESR capacitor from OUT to GND. Regulator Output Feedback Point. OUTSENSE must be connected to OUT for fixed output voltage versions. Leave OUTSENSE open circuit for adjustable output voltage version. Ground Feedback Regulation Set Point. Connect SET to GND for a fixed 3.3V output (MAX5086A) or 5.0V output (MAX5086B). Connect an external resistive divider network from OUTSENSE to SET to GND to adjust the output voltage from 2.5V to 11V. Open-Drain Active-Low Reset Output. Connect a 10k pullup resistor from RESET to any supply voltage up to 11V to create a logic output. Reset Timeout Setting Connection. A 2A charging current is available at CT. Connect a capacitor from CT to GND to set the reset timeout period (see the Adjustable Reset Timeout Period (CT) section). Exposed Pad. Connect externally to a large ground plane to aid heat dissipation. Do not use EP as the only ground connection. FUNCTION
10 11 EP
RESET CT EP
6
_______________________________________________________________________________________
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086
IN
MAX5086
VREF CONTROL LOGIC, THERMAL SHUTDOWN, AND OVERCURRENT PROTECTION INTERNAL SUPPLY VOLTAGE
ERROR AMPLIFIER
OUT OUTSENSE
EN
MUX
SET 2A CT CT COMPARATOR DELAY COMPARATOR
RESET
0.92 x VREF
GND
Figure 1. Functional Diagram
_______________________________________________________________________________________
7
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086
Detailed Description
The MAX5086 high-voltage linear regulator includes an integrated microprocessor reset circuit with an adjustable reset timeout period (see the Adjustable Reset Timeout Period (CT) section). The device guarantees a 250mA load current and is available with a preset output voltage of 3.3V (MAX5086A) or 5V (MAX5086B). Both devices can be configured to provide an adjustable output voltage from 2.5V to 11V. The internal reset circuit monitors the regulator output voltage and asserts RESET low when the regulator output falls below the reset threshold voltage. Other features include an enable (regulator control input), 21A (max) shutdown current, short-circuit protection (see the Output Short-Circuit Current Limit section), and thermal shutdown (see the Thermal Protection section).
6.5V TO 45V IN 47F R1 ON OFF EN OUT 15F R3 2.5V TO 11V
MAX5086
OUTSENSE RESET CT SET GND R2
TO P
CCT
VOUT = VSET (1 + R1/R2) VSET = 1.23V
Regulator
The MAX5086 accepts an input voltage range from 6.5V to 45V and offers a fixed output voltage of 3.3V or 5V. For an adjustable output voltage operation, use an external resistive divider network connected between OUT, SET, and GND (see Figure 2).
Figure 2. Setting the Adjustable Output Voltage
Adjustable Reset Timeout Period (CT)
The MAX5086 features a user-adjustable reset timeout. Connect a capacitor from CT to GND to set the reset timeout period (see Figure 2) and use the following equation to calculate the timeout period: tRP = CCT x 0.6175 x 106 where CCT is the value of the external capacitor connected from CT to GND and tRP is in seconds.
Enable Input (EN)
EN is a logic-level enable input that turns ON/OFF the device. Drive EN high to turn on the device and drive EN low to place the device in shutdown. The MAX5086 draws 13A (typ) of supply current when in shutdown. EN withstands voltages up to +45V, allowing EN to be connected to IN for an always-on operation.
Thermal Protection
When the junction temperature exceeds TJ = 175C an internal thermal sensor signals the shutdown logic, which turns off the pass transistor, allowing the IC to cool. The thermal sensor turns the pass transistor on again after the IC's junction temperature cools by 25C, resulting in a cycled output during continuous thermaloverload conditions. Thermal protection protects the MAX5086 in the event of fault conditions. During continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150C.
Remote Sensing (OUTSENSE)
For fixed output voltage versions, OUTSENSE must be used for load voltage sensing. Leave OUTSENSE open circuit when using adjustable output voltage version.
Reset Output (RESET)
A supervisor circuit is fully integrated in the MAX5086 and uses the same reference voltage as the regulator. RESET goes low if VOUT drops below the preset output voltage threshold, and remains low at least for the timeout period after VOUT rises above the reset voltage threshold.
Output Short-Circuit Current Limit
The MAX5086 features a current limit. The output can be shorted to GND for an indefinite period of time (for VIN < 16V) without damage to the device.
8
_______________________________________________________________________________________
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay
Applications Information
Output Voltage Selection
The MAX5086 features dual-mode operation, in either a preset voltage mode or an adjustable mode. In preset voltage mode, internal feedback resistors set the MAX5086's output voltage to +3.3V or +5V. Select preset voltage mode by connecting SET to ground. In adjustable mode, select an output between +2.5V and +11V using two external resistors connected as a voltage-divider to SET (Figure 2). Set the output voltage using the following equation: R1 VOUT = VSET x 1 + R2 where VSET = 1.23V and R2 is chosen to be approximately 100k.
4.0 3.5 3.0 2.5 PD (W) 2.0 1.5 1.0 0.5 0 0 20 40 60 80 100 120 140 TEMPERATURE (C) DERATE 33.3mW/C 2.666W
MAX5086
MAXIMUM POWER DISSIPATION vs. TEMPERATURE
MAX5086 fig03
Available Output Current Calculation
The MAX5086 high-voltage regulator provides up to 250mA of output current. The input voltage extends to +45V. Package power dissipation limits the amount of output current available for a given input/output voltage and ambient temperature. Figure 3 depicts the maximum power dissipation curve for these devices. The graph assumes that the exposed pad of the MAX5086 package is set up per JEDEC specifications. Use Figure 3 to determine the allowable package dissipation (P D ) for a given ambient temperature. Alternately, use the following formula to calculate the allowable package dissipation: 2.666W for TA + 70C W PD = 2.666W - 0.0333 x (TA - 70C) C For + 70C < TA + 125C After determining the allowable package dissipation calculate the maximum output current using the following formula: IOUT(MAX) PD 250mA VIN - VOUT
Figure 3. Calculated Maximum Power Dissipation vs. Temperature
Example 1: TA = +85C VIN = +14V VOUT = +5V Find the maximum allowable output current. First calculate package dissipation at the given temperature as follows:
PD = 2.666W - 0.0333 W (85C - 70C) = 2.1665W C
Then determine the maximum output current: IOUT(MAX) = (2.1665W) = 271mA (14V) - (5V)
The above equations do not include the negligible power dissipation from self-heating due to the IC ground current.
_______________________________________________________________________________________
9
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086
Example 2: TA = +125C VIN = +14V VOUT = +5V Calculate package dissipation at the given temperature as follows:
PD = 2.666W - 0.0333
IOUT(MAX) (A)
MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE
VOUT = +5V
MAX5086 fig04
0.30 0.25 0.20 0.15 0.10 0.05 0
W (125C - 70C) = 0.8345W C
TA = +70C TA = +85C TA = +125C
And establish the maximum current: IOUT(MAX) = Example 3: TA = +50C VIN = +14V VOUT = +5V Calculate package dissipation at the given temperature as follows: PD = 2.666W And find the maximum output current:
IOUT(MAX) = (2.666W) = 296mA IOUT(MAX) = 250mA (14V) - (5V)
(0.8345W) = 92mA (14V) - (5V)
0
5
10
15
20
25
30
35
40
45
VIN (V)
Figure 4. Maximum Output Current vs. Input Voltage
In Example 3, the maximum output current is calculated as 296mA, however, the maximum output current cannot exceed 250mA. Use Figure 4 to quickly determine maximum allowable output current for selected ambient temperatures.
output capacitor with an ESR < 0.25. To reduce noise and improve load-transient response, stability, and power-supply rejection, use larger output capacitor values such as 22F. Some ceramic capacitor dielectrics exhibit large capacitance and ESR variation with temperature. For capacitor dielectrics such as Y5V, use 22F or more to ensure stability at temperatures below -10C. With X7R or X5R dielectrics, 15F should be sufficient at all operating temperatures. To improve power supply rejection and transient response, use a minimum 47F low ESR capacitor from IN to GND.
Output Capacitor Selection and Regulator Stability
For stable operation over the full temperature range and with load currents up to 250mA, use a 15F (min)
Chip Information
TRANSISTOR COUNT: 1386 PROCESS: BiCMOS
10
______________________________________________________________________________________
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay
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.)
MAX5086
______________________________________________________________________________________
QFN THIN.EPS
11
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086
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.)
12
______________________________________________________________________________________
45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay
Revision History
REVISION NUMBER 1 2 REVISION DATE 7/06 2/08 DESCRIPTION Updated data sheet with improved output voltage parameters Corrected errors in data sheet, reduced operating range, and removed unreleased product from ordering information PAGES CHANGED 2 1-15
MAX5086
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13
(c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

▲Up To Search▲

Price & Availability of MAX508608

	To Download MAX508608 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .