MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay General Description Features The MAX5087 high-voltage linear regulator operates from an input voltage of 6.5V to 45V and delivers up to 400mA of output current. The device consumes only 70µA of quiescent current with no load and 11µA in shutdown. The device includes a SET input, that when connected to ground, selects a preset output voltage of 3.3V (MAX5087A) or 5.0V (MAX5087B). 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 MAX5087 also provides an open-drain, active-low microprocessor (µP) 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 short-circuit protection. The MAX5087 operates over the automotive temperature range of -40°C to +125°C and is available in a 16pin TQFN thermally enhanced package. o Wide Operating Input Voltage Range (6.5V to 45V) o Thermally Enhanced Package Dissipates 2.6W at TA = +70°C (16-Pin TQFN) o Guaranteed 400mA Output Current o 70µA Quiescent Supply Current o Preset 3.3V, 5.0V, or Adjustable 2.5V to 11V Output Voltage o Remote Load Sense Capability o Enable Input o Integrated µP Reset Circuit with Programmable Timeout Period o Thermal and Short-Circuit Protection o -40°C to +125°C Operating Temperature Range Applications Automotive Industrial Home Security/Safety Networking Ordering Information PART OUTPUT VOLTAGE (V) PIN-PACKAGE MAX5087AATE+ 16 TQFN-EP* 3.3 MAX5087BATE+ 16 TQFN-EP* 5.0 MAX5087BATE/V+ 16 TQFN-EP* 5.0 Note: All devices are specified over the -40°C to +125°C operating temperature range. *EP = Exposed paddle. +Denotes lead-free package. Pin Configuration N.C. CT RESET SET TOP VIEW 12 11 10 9 N.C. 13 8 GND N.C. 14 7 OUTSENSE N.C. 15 6 OUT N.C. 16 5 OUT MAX5087 2 3 4 IN IN N.C. 1 EN + TQFN For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-3964; Rev 4; 4/13 MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay ABSOLUTE MAXIMUM RATINGS Maximum Current into Any Pin (Except IN, OUT).............±20mA Continuous Power Dissipation (TA = +70°C) 16-Pin TQFN (derate 33.3mW/°C above +70°C) ......2666mW* Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 IN to OUT................................................................-0.3V to +50V CT, SET TO GND....................................................-0.3V to +35V Short-Circuit Duration (VIN ≤ 14V) ..............................Continuous 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) TQFN Junction-to-Ambient Thermal Resistance (θJA) ........30.0°C/W Junction-to-Case Thermal Resistance (θJC) ..................2°C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7 using a fourlayer board. For detailed information on thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (VIN = 14V, IOUT = 1mA, CIN = 47µF (low ESR), COUT = 15µF, VEN = 2.4V, 10kΩ from RESET to OUT, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 2) PARAMETER Input Voltage Range Supply Current Shutdown Supply Current SYMBOL CONDITIONS VIN VIN ≥ VOUT + 1.5V IQ Measured at GND, SET = GND ISHDN MIN TYP 6.5 IOUT = 0 70 IOUT = 400mA MAX UNITS 45.0 V 150 5300 VEN ≤ 0.4V 11 21 µA µA 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 ΔVDO Startup Response Time Line Regulation ΔVOUT / ΔVIN Enable Voltage VEN 2 mA 6.5V ≤ VIN ≤ 25V, 5mA ≤ IOUT ≤ 400mA 4.87 5 5.13 6.5V ≤ VIN ≤ 45V, 5mA ≤ IOUT ≤ 100mA 4.850 5 5.150 6.5V ≤ VIN ≤ 25V, 5mA ≤ IOUT ≤ 400mA 3.208 3.3 3.392 6.5V ≤ VIN ≤ 45V, 5mA ≤ IOUT ≤ 100mA 3.208 3.3 3.392 IOUT = 5mA, adjustable range Dropout Voltage 400 2.5 11.0 IOUT = 400mA, VOUT = 5V (Note 4) 0.9 Rising edge of VIN to VOUT, RL = 500Ω, SET = GND (Note 5) 400 8V ≤ VIN ≤ 45V 5V version 3.3V version VEN = high, regulator on VEN = low, regulator off V 2.2 V µs -1 +1 -0.5 +0.5 2.4 0.4 mV/V V Maxim Integrated MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay ELECTRICAL CHARACTERISTICS (continued) (VIN = 14V, IOUT = 1mA, CIN = 47µF (low ESR), COUT = 15µF, VEN = 2.4V, 10kΩ from RESET to OUT, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 2) PARAMETER Enable Input Current SYMBOL IEN CONDITIONS MIN TYP VEN = 2.4V 0.35 VEN = 14V 3.4 MAX UNITS µA SET Reference Voltage VSET 1.200 1.235 1.260 V SET Input Leakage Current ISET -100 +0.5 +100 nA IOUT = 1mA to 400mA (Note 3) 0.1 0.35 Ω IOUT = 10mA, f = 100Hz, 500mVP-P, VOUT = 5V 70 dB VIN < 14V (Note 6) 640 mA 175 °C Load Regulation Power-Supply Rejection Ratio Short-Circuit Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis ΔVOUT / ΔIOUT PSRR ISC TJ(SHDN) ΔTJ(SHDN) 25 °C RESET Voltage Threshold VRESET RESET Threshold Hysteresis VRHYST RESET Output Low Voltage VRL ISINK = 1mA 0.4 V RESET Output Leakage Current IRH VRESET = 5V 1 µA 89 92 94 2 % VOUT % VOUT RESET Output Minimum Timeout Period When VOUT reaches RESET threshold, CCT = Open 15 µs ENABLE to RESET Minimum Timeout Period When EN goes high, CCT = open 170 µs Delay Comparator Threshold (Rising) 1.196 Delay Comparator Threshold Hysteresis CT Charge Current CT Discharge Current Note 2: Note 3: Note 4: Note 5: Note 6: 1.230 1.264 100 1 2 V mV 4 5 µA mA Limits at TA = -40°C 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 > 14V not guaranteed. Maxim Integrated 3 MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Typical Operating Characteristics (VIN = VEN = 14V, CIN = 47µF (low ESR), COUT = 15µF, VOUT = 5V, SET = GND, TA = +25°C, unless otherwise specified.) 4.0 IGND (μA) 3.0 2.5 2.0 1.5 1.0 IOUT = 0 8 6 4 2 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT VOLTAGE vs. TEMPERATURE GROUND CURRENT vs. TEMPERATURE (PULSED LOAD) OUTPUT VOLTAGE vs. LOAD CURRENT AND TEMPERATURE 25 30 35 40 45 6 MAX5087 toc04 5.15 VIN = +6.5V 5 5.10 5.25 5.20 5.00 4.95 IOUT = 400mA 3 4.85 IOUT = 50mA 5.00 IOUT = 400mA 4.85 4.80 IOUT = 5mA 4.75 5.05 4.90 IOUT = 100mA 1 4.80 IOUT = 100mA 4.95 2 4.90 IOUT = 50mA 5.10 VOUT (V) 5.05 VIN = +6.5V 5.15 4 IGND (mA) VOUT (V) 10 VIN (V) 20 5.20 4.75 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 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) DROPOUT VOLTAGE vs. LOAD CURRENT POWER-SUPPLY REJECTION RATIO vs. FREQUENCY LOAD-TRANSIENT RESPONSE 1.35 1.20 MAX5087 toc09 0 MAX5087 toc07 1.50 COUT = 15μF IOUT = 10mA -10 IOUT = 5mA VOUT 200mV/div AC-COUPLED -20 1.05 0.90 PSRR (dB) VDROPOUT (V) VIN = +6.5V -40 -25 -10 5 20 35 50 65 80 95 110 125 15 5.25 0.75 0.60 0.45 0.30 0.15 -30 -40 -50 400mA -60 IOUT 200mA/div -70 5mA VOUT = +5V -80 0 0 50 100 150 200 250 300 350 400 IOUT (mA) 4 50 40 30 20 12 MAX5087 toc06 10 VIN = +14V MAX5087 toc05 5 16 10 0 0 0 18 14 80 70 60 MAX5087 toc08 VOUT (V) 3.5 VIN = +45V 100 90 MAX5087 toc03 4.5 20 ISHDN (μA) 5.0 MAX5087 toc02 120 110 MAX5087 toc01 5.5 0.5 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE NO-LOAD SUPPLY CURRENT vs. TEMPERATURE OUTPUT VOLTAGE vs. INPUT VOLTAGE 0.1 1 10 100 1000 400μs/div FREQUENCY (kHz) Maxim Integrated MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Typical Operating Characteristics (continued) (VIN = VEN = 14V, CIN = 47µF (low ESR) COUT = 15µF, VOUT = 5V, SET = GND, TA = +25°C, unless otherwise specified.) INPUT VOLTAGE STEP RESPONSE ENABLE STARTUP RESPONSE STARTUP RESPONSE MAX5087 toc10 MAX5087 toc12 MAX5087 toc11 IOUT = 50mA IOUT = 5mA VOUT AC-COUPLED 500mV/div EN 1V/div VOUT 2V/div 0V 0V VOUT 2V/div VIN 10V/div 0V 400μs/div 100μs/div 400μs/div ENABLE STARTUP RESPONSE ENABLE STARTUP RESPONSE ENABLE STARTUP RESPONSE MAX5087 toc13 MAX5087 toc15 MAX5087 toc14 EN 1V/div EN 1V/div EN 1V/div 0V 0V 0V VOUT 2V/div VOUT 2V/div VOUT 2V/div VIN = 14V IOUT = 400mA 0V VIN = 14V IOUT = 0 0V VIN = 45V IOUT = 0 0V VIN = 45V IOUT = 400mA 0V 100μs/div 100μs/div 100μs/div SHUTDOWN RESPONSE GROUND CURRENT DISTRIBUTION (TA = -40°C) GROUND CURRENT DISTRIBUTION (TA = +125°C) 40 150 UNITS TESTED 35 EN 1V/div VOUT 2V/div 30 25 20 15 Maxim Integrated 25 20 15 10 10 5 5 0 0 20ms/div 150 UNITS TESTED 35 30 NUMBER OF UNITS 0V 40 NUMBER OF UNITS 0V MAX5087 toc17 MAX5087 toc16 IOUT = 5mA MAX5087 toc18 26V VIN 10V/div 6.5V 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 63 65 66 67 68 69 70 71 72 73 74 75 76 IGND (μA) IGND (μA) 5 MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Pin Description 6 PIN NAME FUNCTION 1, 12–16 N.C. 2 EN Enable Input. Drive EN high to turn on the regulator. Force EN low to place the device in shutdown mode. 3, 4 IN Regulator Input. Supply voltage ranges from 6.5V to 45V. Bypass IN to GND with a low-ESR 47µF electrolytic capacitor. 5, 6 OUT 7 OUTSENSE 8 GND Ground 9 SET Feedback Regulation Set Point. Connect SET to GND for a fixed 3.3V output (MAX5087A) or 5.0V output (MAX5087B). Connect an external resistive divider network from OUTSENSE to SET to GND to adjust the output voltage from 2.5V to 11V. 10 RESET 11 CT Reset Timeout Setting Connection. A 2µA 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). — EP Exposed Paddle. Connect externally to a large ground plane to aid heat dissipation. Do not use EP as a ground connection. No Connection. Not internally connected. Regulator Output. Connect at least a 15µF 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 for adjustable output voltage version. Open-Drain Active-Low Reset Output. Connect a 10kΩ pullup resistor from RESET to any supply voltage up to 11V to create a logic output. Maxim Integrated MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay IN ERROR AMPLIFIER MAX5087 VREF 1.235V CONTROL LOGIC, THERMAL SHUTDOWN, AND OVERCURRENT PROTECTION OUTSENSE MUX EN OUT INTERNAL SUPPLY VOLTAGE SET 2µA CT DELAY COMPARATOR CT COMPARATOR RESET 0.92 x VREF GND Figure 1. Functional Diagram Maxim Integrated 7 MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Detailed Description The MAX5087 high-voltage linear regulator includes an integrated µP reset circuit with an adjustable reset timeout period (see the Adjustable Reset Timeout Period (CT) section). The device guarantees a 400mA load current and is available with a preset output voltage of 3.3V (MAX5087A) or 5V (MAX5087B). 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), 21µA (max) shutdown current, short-circuit protection (see the Output Short-Circuit Current Limit section), and thermal shutdown (see the Thermal Protection section). Regulator The MAX5087 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). Enable Input (EN) EN is a logic-level enable input that turns the device on/off. Drive EN high to turn on the device and drive EN low to place the device in shutdown. The MAX5087 draws 11µA (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. Remote Sensing (OUTSENSE) The 3.3V (MAX5087A) and 5V (MAX5087B) output voltage versions connect OUTSENSE for load voltage sensing. Leave OUTSENSE open when using adjustable output voltage version. Reset Output (RESET) A supervisor circuit is fully integrated in the MAX5087 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. Adjustable Reset Timeout Period (CT) The MAX5087 features a user-adjustable reset timeout. Connect a capacitor from CT to GND to set the reset 8 6.5V TO 45V 2.5V TO 11V OUT IN 47µF 15µF MAX5087 R1 ON EN OFF TO µP OUTSENSE RESET SET CT CCT GND R2 VOUT = VSET (1 + R1 / R2) VSET = 1.235V Figure 2. Setting the Adjustable Output Voltage timeout period (see Figure 2) and use the following equation to calculate the timeout period: tRP = CCT x 0.6175 x 106 (s) where CCT is the value of the external capacitor connected from CT to GND. Thermal Protection When the junction temperature exceeds TJ = +175°C, 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 25°C, resulting in a cycled output during continuous thermaloverload conditions. Thermal protection protects the MAX5087 in the event of fault conditions. During continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150°C. Output Short-Circuit Current Limit The MAX5087 features a current limit. The output can be shorted to GND for an indefinite period of time (for VIN < 14V) without damage to the device. Continuous output short-circuit protection is only guaranteed for VIN < 14V. Maxim Integrated MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Applications Information Output-Voltage Selection MAX5087 fig03 4.0 3.5 3.0 2.5 PD (W) The MAX5087 features a Dual ModeTM operation, in either a preset-voltage mode or an adjustable mode. In preset-voltage mode, internal feedback resistors set the MAX5087’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: 2.666W (16-PIN TQFN) 2.0 1.5 DERATE 33.3mW/°C 1.0 0.5 R1 ⎞ ⎛ VOUT = VSET x ⎜1 + ⎟ ⎝ R2 ⎠ 0 0 20 40 60 80 100 120 140 TEMPERATURE (°C) where VSET = 1.235V and R2 is chosen to be < 100kΩ. Available Output-Current Calculation The MAX5087 high-voltage regulator provides up to 400mA 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 shows the maximum power dissipation curve for these devices. The graph assumes that the exposed paddle of the MAX5087 package is set up per JEDEC 51 (multilayer board) specifications. Use Figure 3 to determine the allowable package dissipation (P D ) for a given ambient temperature. Alternately, use the following formulas to calculate the allowable package dissipation. Note that for the examples shown below, the electrical characteristic limits are guaranteed up to TJ = +125°C (max). ⎧2.666W for TA ≤ + 70°C ⎫ ⎪ ⎪ PD = ⎨ ⎬ W ⎪2.666W − 0.0333 °C x (TA − 70°C) for + 70°C < TA ≤ + 125°C⎪ ⎩ ⎭ Figure 3. Calculated Maximum Power Dissipation vs. Temperature The above equations do not include the negligible power dissipation from self-heating due to the IC ground current. Example 1: TA = +95°C 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 Then determine the maximum output current: IOUT(MAX) = After determining the allowable package dissipation calculate the maximum output current using the following formula: IOUT(MAX) ≅ PD ≤ 400mA VIN − VOUT W (95°C − 70°C) = 1.8335W °C (1.8335W) = 203mA (14V) − (5V) Example 2: TA = +125°C VIN = +14V VOUT = +5V Dual Mode is a trademark of Maxim Integrated Products, Inc. Maxim Integrated 9 Calculate package dissipation at the given temperature as follows: 0.50 VOUT = +5V 0.45 W (125°C − 70°C) = 0.8345W °C And establish the maximum current: (1.191W) IOUT(MAX) = = 92.7mA (14V) − (5V) 0.40 TA = +70°C TA = +85°C TA = +125°C 0.35 IOUT(MAX) (A) PD = 2.666W − 0.0333 MAX5087 fig04 MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay 0.30 0.25 0.20 0.15 0.10 0.05 Example 3: TA = +50°C 0 0 VOUT = +10V Calculate package dissipation at the given temperature as follows: PD = 2.666W And find the maximum output current: (2.666W) = 666mA ⇒ IOUT(MAX) = 400mA (14V) − (10V) In example 3 the maximum output current is calculated as 666mA, however, the maximum output current cannot exceed 400mA. Use Figure 4 to quickly determine maximum allowable output current for selected ambient temperatures. 10 10 15 20 25 30 35 40 45 VIN (V) VIN = +14V IOUT(MAX) = 5 Figure 4. Maximum Output Current vs. Input Voltage (16-Pin TQFN) Output-Capacitor Selection and Regulator Stability For stable operation over the full temperature range and with load currents up to 400mA, use a 15µF (min) output capacitor with an ESR < 0.25Ω. To reduce noise and improve load-transient response, stability, and power-supply rejection use larger output capacitor values such as 22µF. Some ceramic capacitor dielectrics exhibit large capacitance and ESR variation with temperature. For capacitor dielectrics such as Y5V, use 22µF or more to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 15µF should be sufficient at all operating temperatures. To improve power supply rejection and transient response, use a minimum 47µF low-ESR capacitor from IN to GND. Maxim Integrated MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Package Information Chip Information PROCESS: BiCMOS Maxim Integrated For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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 OUTLINE NO. LAND PATTERN NO. 16 TQFN-EP T1655+2 21-0140 90-0073 11 MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Revision History REVISION NUMBER REVISION DATE 0 2/06 Initial release 1 4/06 Updated Ordering Information and Electrical Characteristics tables. 2 7/06 Updated Electrical Characteristics table. 3 2/08 Corrected errors in data sheet, reduced operating range, and removed products from Ordering Information table. 4 4/13 Added /V variant to Ordering Information DESCRIPTION PAGES CHANGED — 1–3 2 1–13 1 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 12 ________________________________Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 © 2013 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.