19-4816; Rev 0; 7/09 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator The MAX16910 ultra-low quiescent current, high-voltage linear regulator is ideal for use in automotive and batteryoperated systems. The device operates from a +3.5V to +30V input voltage, delivers up to 200mA of load current, and consumes only 20µA of quiescent current at no load. The device consumes only 1.6μA current when in shutdown. The input is +45V transient tolerant and is designed to operate under load-dump conditions. The MAX16910 can be configured as either fixed output voltage (+3.3V or +5V) or adjustable output voltage using an external resistive divider. The MAX16910 features an open-drain, active-low RESET output with fixed thresholds offered at 92.5% and 87.5% of the output voltage. The RESET output remains low for a fixed period of 60µs after the output voltage exceeds its threshold. The RESET delay can be extended with an external capacitor. The MAX16910 includes an enable input, short-circuit protection, and thermal shutdown. The MAX16910 operates over the -40°C to +125°C automotive temperature range. The device is available in a space-saving, thermally enhanced, 3mm x 3mm, 8-pin TDFN package and 5mm x 4mm, 8-pin SO package. Features S Low 20µA Quiescent Current S +3.5V to +30V Wide Input Voltage Range, +45V Tolerant S Operates Through Cold-Crank Conditions S Low-Dropout Voltage of 280mV at 200mA S Up to 200mA Output Current Capability S Stable Operation with Tiny 4.7µF Output Capacitor S User-Selectable Output Voltage +3.3V or +5V Fixed +1.5V to +11V Adjustable with External Resistive Divider S Open-Drain RESET Output with Adjustable Delay S Fixed-Reset Threshold Options: 87.5% or 92.5% S High-Voltage Enable Input (+45V) S Thermal and Short-Circuit Protection S Operating -40°C to +125°C Temperature Range S Automotive Qualified Ordering Information Applications Automotive PART Industrial Telecom Typical Operating Circuits 5V FIXED OUTPUT IN OUT 1µF ENABLE + - 14V BATTERY SETOV SET GND RESET (mA) TEMP RANGE PINPACKAGE MAX16910CATA_/V+ 200 -40NC to +125NC 8 TDFN-EP* (3mm x 3mm) MAX16910CASA_/V+ 200 -40NC to +125NC 8 SO-EP* (5mm x 4mm) Insert the desired suffix numbers (from the Selector Guide) into the blank “_” to indicate reset threshold. +Denotes a lead(Pb)-free/RoHS-compliant package. /V Denotes an automotive qualified part. *EP = Exposed pad. VCC 4.7µF MAX16910 IOUT 10kI µC I/O RESET TIMEOUT 1nF (1.25ms DELAY) Typical Operating Circuits continued on next page. ________________________________________________________________ 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. MAX16910 General Description MAX16910 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator Typical Operating Circuits (continued) 3.3V FIXED OUTPUT IN OUT 1µF ENABLE + - VCC MAX16910 4.7µF SETOV 14V BATTERY SET I/O RESET RESET GND µC 10kI TIMEOUT 1nF (1.25ms DELAY) ADJUSTABLE OUTPUT IN OUT 1µF ENABLE + - 14V BATTERY R1 MAX16910 SETOV R2 SET VCC 4.7µF 10kI µC I/O GND TIMEOUT RESET RESET 1nF (1.25ms DELAY) 2 _______________________________________________________________________________________ 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator OUT GND SETOV TIMEOUT TOP VIEW 8 7 6 5 MAX16910 TOP VIEW IN 1 ENABLE 2 SET 3 + 8 MAX16910 *EP RESET 4 *EP 1 2 3 4 IN ENABLE SET RESET + OUT 7 GND 6 SETOV 5 TIMEOUT SO *CONNECT EXPOSED PAD TO GND. TDFN *CONNECT EXPOSED PAD TO GND. _______________________________________________________________________________________ 3 MAX16910 Pin Configurations MAX16910 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) IN, ENABLE, SET.................................................. -0.3V to +45V OUT, RESET (open-drain output)............................-0.3V to +12V SETOV, TIMEOUT....................................................-0.3V to +6V Maximum Current (all pins except IN and OUT)...............50mA Continuous Power Dissipation (TA = +70°C) 8-Pin TDFN (derate 24.4mW/°C above +70°C)*.............1951mW 8-Pin SO (derate 23.3mW/°C above +70°C)*................1861mW Junction-to-Case Thermal Resistance (ΘJC) (Note 1) 8-Pin TDFN.......................................................................8°C/W 8-Pin SO...........................................................................7°C/W Junction-to-Ambient Thermal Resistance (ΘJA) (Note 1) 8-Pin TDFN.....................................................................41°C/W 8-Pin SO.........................................................................43°C/W 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 *As per JEDEC51 Standard (multilayer board). 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 package 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 = VENABLE = +14V, CTIMEOUT = open, CIN = 1μF, COUT = 4.7μF, unless otherwise noted. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are TA = +25°C.) (Note 2) PARAMETER Supply Voltage Range SYMBOL VIN Supply Current CONDITIONS Continuous 20 30 3 1mA P ILOAD P 200mA, VIN = 6V to 30V (Note 3) Output Voltage (3.3V Fixed Output Setting) VOUT33 1mA P ILOAD P 200mA, VIN = 4.8V to 30V (Note 3) Short-Circuit Output Current Limit Thermal Shutdown 45 1.6 VOUT50 Dropout Voltage (Note 4) 30 ENABLE = GND, TA = +25NC Output Voltage (5V Fixed Output Setting) ENABLE = GND, -40NC P TA P +125NC VOUT VSETOV MAX ILOAD = 0, SET = GND, VOUT = 5V ISHDN SETOV FB Voltage TYP 3.5 For P 400ms Shutdown Supply Current Adjustable Output-Voltage Range MIN 3 DVDO ILOAD = 200mA, SET = GND, SETOV = HIGH, VOUT(NORM) = +5.0V ISC Output shorted to GND (MAX16910C__) (Note 5) V FA FA 4.9 5.0 5.1 V 3.234 3.3 3.366 V 11.0 V 1.25 1.275 V 280 600 mV 1.5 ILOAD = 1mA UNITS 1.225 230 330 mA +180 NC 4 _______________________________________________________________________________________ 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator (VIN = VENABLE = +14V, CTIMEOUT = open, CIN = 1μF, COUT = 4.7μF, unless otherwise noted. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS Thermal Shutdown Hysteresis (Note 5) Line Regulation (5V Fixed Output Setting) Line Regulation (3.3V Fixed Output Setting) MIN TYP MAX UNITS +25 NC VIN = 6V to 30V, ILOAD = 1mA 1 mV VIN = 4.8V to 30V, ILOAD = 1mA 1 mV Load Regulation (5V Fixed Output Setting) ILOAD = 1mA to 200mA 12 mV Load Regulation (3.3V Fixed Output Setting) ILOAD = 1mA to 200mA 12 mV Power-Supply Rejection Ratio PSRR ILOAD = 10mA, f = 100Hz, 500mVP-P (Note 5) 60 dB Startup Response Time tSTART Rising edge of VIN to VOUT, ILOAD = 50mA (Note 5) 160 Fs TIMEOUT INPUT TIMEOUT Ramp Current ITO TIMEOUT connected to GND 0.600 TIMEOUT Ramp Delay 1.0 1.650 1.25 RESET Default Timeout Period nA ms/nF VOUT rising, TIMEOUT = OPEN 30 60 90 Fs MAX16910__9/V+, VOUT falling 90 92.5 94 MAX16910__8/V+, VOUT falling 85 87.5 89 % of VOUT RESET OUTPUT RESET Threshold RESET Threshold Hysteresis VOUT rising 5 % of VOUT OUT to RESET Delay VOUT falling (Note 5) 4 Fs RESET Output-Voltage Low (Open-Drain) VOL ISINK = 0.5mA, RESET asserted RESET Open-Drain Leakage Current RESET not asserted, RESET = 7V, TA = +25NC RESET Open-Drain Leakage Current RESET not asserted, RESET = 7V, -40NC ≤ TA ≤ +125NC 0.4 V 1 FA 0.03 FA ENABLE ENABLE Logic-Low VIL ENABLE Logic-High VIH ENABLE Pulldown Current 0.4 2.4 (Note 6) V V 0.65 FA SET INPUT TA = +25NC SET Input Current (All Modes) -50 TA = +125NC SET Logic-Low VILSET Set Logic-High VIHSET +50 0.2 FA 0.4 2.4 nA V V _______________________________________________________________________________________ 5 MAX16910 ELECTRICAL CHARACTERISTICS (continued) ELECTRICAL CHARACTERISTICS (continued) (VIN = VENABLE = +14V, CTIMEOUT = open, CIN = 1μF, COUT = 4.7μF, unless otherwise noted. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are TA = +25°C.) (Note 2) PARAMETER SETOV INPUT (TRI-MODE) SYMBOL CONDITIONS MIN VILSETOV SET = GND, VSETOV < VILSETOV or places device in +3.3V fixed output-voltage mode SETOV High-Level Input Voltage VIHSETOV SET = GND, VSETOV > VIHSETOV or places device in +5V fixed output-voltage mode 2: 3: 4: 5: 6: MAX UNITS 1 SETOV Low-Level Input Voltage Note Note Note Note Note TYP SET = HIGH, VSETOV = 5V or SET = GND, VSETOV = 5V SETOV Input Leakage Current FA 0.4 V VOUT - 0.4 V Production tested at TA = +25°C. Overtemperature limits are guaranteed by design. Observe the absolute maximum power dissipation limits. Dropout voltage is defined as (VIN - VOUT) when VOUT is 2% below the value of VOUT for VIN = VOUT + 3V. Not production tested. ENABLE is internally pulled to GND. Typical Operating Characteristics (VIN = VEN = +14V, CIN = 1µF, COUT = 4.7µF ceramic, TA = +25°C, unless otherwise noted.) GROUND CURRENT vs. LOAD CURRENT ILOAD = 0 27 10 MAX16910 toc02 80 MAX16910 toc01 30 SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE VOUT = 3.3V 60 MAX16910 toc03 SUPPLY CURRENT vs. SUPPLY VOLTAGE 8 IGND(FA) 24 21 TA = +125NC 40 TA = +25NC 15 0 5 10 15 VIN (V) 20 25 30 6 4 20 18 IIN(FA) TA = -40NC IIN (FA) MAX16910 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator 2 0 0 20 40 60 80 100 120 140 160 180 200 0 0 5 10 ILOAD (mA) 6 _______________________________________________________________________________________ 15 VIN (V) 20 25 30 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator RESET THRESHOLD vs. TEMPERATURE VIN = 30V 4 VIN = 14V 2 MAX16910_9/V RISING 4.9 MAX16910_9/V FALLING 4.6 MAX16910_8/V RISING -25 0 25 50 75 -50 100 125 150 TA = +125NC 0.35 TA = +25NC 0.30 0.25 TA = -40NC 0.20 0.15 0.10 0.05 4.0 -50 -25 0 25 50 75 0 100 125 150 0 20 40 60 80 100 120 140 160 180 200 TEMPERATURE (NC) TEMPERATURE (NC) LOAD CURRENT (mA) DROPOUT VOLTAGE vs. LOAD CURRENT (3.3V OUTPUT) OUTPUT VOLTAGE vs. SUPPLY VOLTAGE OUTPUT VOLTAGE vs. SUPPLY VOLTAGE 0.35 3.0 4.5 4.0 2.5 TA = +25NC 3.5 VOUT (V) 0.30 TA = -40NC 0.25 5.0 0.20 0.15 VOUT (V) 0.40 5.5 2.0 1.5 0.10 0 ILOAD = 0 SETOV = OUT SET = GND 1.0 0.5 0 0 20 40 60 80 100 120 140 160 180 200 2.5 1.5 ILOAD = 0 SETOV = GND SET = GND 0.5 0.05 3.0 2.0 1.0 0 MAX16910 toc09 TA = +125NC 3.5 MAX16910 toc08 TA = +150NC 0.45 MAX16910 toc07 0.50 0 5 10 15 20 25 30 35 0 40 5 10 15 20 25 30 35 LOAD CURRENT (mA) VIN (V) VIN (V) OUTPUT VOLTAGE vs.TEMPERATURE RESET TIMEOUT PERIOD vs. TEMPERATURE POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ILOAD = 64mA 55 TIMEOUT PERIOD (Fs) 5.03 5.01 4.99 CTIMEOUT UNCONNECTED 50 40 35 -25 0 25 50 75 TEMPERATURE (NC) 100 125 125 -40 -60 20 -50 -30 -50 25 4.95 ILOAD = 10mA VIN = 14V + 0.5VP-P -10 -20 45 30 4.97 0 40 MAX16910 toc12 60 MAX16910 toc10 5.05 PSRR (dB) DROPOUT VOLTAGE (V) 0.40 MAX16910_8/V FALLING 0 TA = +150NC 0.45 4.3 VIN = 6V VOUT (V) MAX16910 toc05 5.2 0.50 DROPOUT VOLTAGE (V) 6 VOUT = 5V MAX16910 toc11 IIN (FA) 8 5.5 RESET THRESHOLD VOLTAGE (V) MAX16910 toc04 10 DROPOUT VOLTAGE vs. LOAD CURRENT (5V OUTPUT) MAX16910 toc06 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE -50 -25 0 25 50 75 TEMPERATURE (NC) 100 125 150 -70 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) _______________________________________________________________________________________ 7 MAX16910 Typical Operating Characteristics (continued) (VIN = VEN = +14V, CIN = 1µF, COUT = 4.7µF ceramic, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VIN = VEN = +14V, CIN = 1µF, COUT = 4.7µF ceramic, TA = +25°C, unless otherwise noted.) RESET OUTPUT VOLTAGE vs. SINK CURRENT RESET TIMEOUT PERIOD vs. TIMEOUT CAPACITANCE TIMEOUT PERIOD (ms) 0.9 0.6 100 VOUT (AC-COUPLED) 100mV/div 10 180mA IOUT 1 0.3 0 0.001 MAX16910 toc15 MAX16910 toc14 1.2 LOAD-TRANSIENT RESPONSE (5V OUTPUT) 1000 MAX16910 toc13 1.5 RESET OUTPUT VOLTAGE (V) MAX16910 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator 10mA 0.1 0.01 0.1 1 0.01 10 0.1 1 10 RESET SINK CURRENT (mA) CTIMEOUT (nF) LOAD-TRANSIENT RESPONSE (3V OUTPUT) LINE-TRANSIENT RESPONSE (5V OUTPUT) MAX16910 toc16 100 200Fs/div LINE-TRANSIENT RESPONSE (3.3V OUTPUT) MAX16910 toc17 VOUT (AC-COUPLED) 100mV/div 180mA IOUT 10mA 200Fs/div MAX16910 toc18 VOUT (AC-COUPLED) 200mV/div VOUT (AC-COUPLED) 200mV/div 28V 28V VIN VIN 6V 4.8V 2ms/div POWER-UP RESPONSE 2ms/div POWER-UP RESPONSE MAX16910 toc19 IOUT = 0A VIN = VEN MAX16910 toc20 14V VIN 14V 0V VIN 0V 3.3V VOUT 3.3V 0V VOUT 170mA IOUT IOUT = 170mA VEN = VIN 0V 40Fs/div 40Fs/div 8 _______________________________________________________________________________________ 0A 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator ENABLE STARTUP RESPONSE ENABLE STARTUP RESPONSE MAX16910 toc21 LOAD-DUMP TRANSIENT RESPONSE MAX16910 toc22 MAX16910 toc23 5V VEN 0V 3.3V VOUT 5V VIN 0V VOUT (AC-COUPLED) 100mV/div 0V 3.3V 42V VOUT 175mA VIN 0A IOUT 14V 0A 40Fs/div 100ms/div 40Fs/div Pin Description PIN NAME 1 IN FUNCTION 2 ENABLE Active-High Enable Input. Force ENABLE high (or connect to IN) to turn the regulator on. Pull ENABLE low (or leave unconnected) to place the device in a low-power shutdown mode. ENABLE is internally pulled down to GND through a 0.65FA current sink. 3 SET Feedback Network Selector. Connect SET to GND when operating the MAX16910 in fixed outputvoltage mode (3.3V or 5V) using the internal feedback network. Connect SET to IN or any voltage higher than 2.4V when an external feedback network (resistive divider) is used, operating the MAX16910 in adjustable output-voltage mode. 4 RESET Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. 5 TIMEOUT Reset-Timeout-Period Adjust Input. Internal capacitance produces a 60Fs default delay when TIMEOUT is left unconnected. Connect a capacitor from TIMEOUT to GND to set a longer timeout period than default. 6 SETOV Regulated Output-Voltage Selector. Connect SETOV to OUT for a 5V fixed output, or connect SETOV to GND for a 3.3V fixed output. SETOV becomes the feedback path when using an external resistive divider for an adjustable output. 7 GND Ground 8 OUT Regulator Output. Bypass OUT to GND with a minimum of 4.7FF. Use a low-ESR, ceramic capacitor (X7R, X5R) for optimal performance. The SETOV input controls the output voltage when in fixed +3.3V or fixed +5V output-voltage mode. Using an external resistive divider between OUT and SETOV sets adjustable output voltage from +1.5V to +11V. — EP Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal-resistance path from the thermal junction to the PCB. Do not use EP as the only electrical connection to GND. Regulator Input. Bypass IN to GND with a 1FF (min) low-ESR ceramic capacitor. _______________________________________________________________________________________ 9 MAX16910 Typical Operating Characteristics (continued) (VIN = VEN = +14V, CIN = 1µF, COUT = 4.7µF ceramic, TA = +25°C, unless otherwise noted.) MAX16910 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator Functional Diagram OUT IN ENABLE CONTROL LOGIC OVERCURRENT PROTECTION THERMAL PROTECTION OUTPUTVOLTAGE SELECT MUX 1.253V MAX16910 1.156V (92.5%) or 1.094V (87.5%) RESET TIMEOUT SET SETOV RESET TIMEOUT GND _______________Detailed Description The MAX16910 low-quiescent current, high-voltage linear regulator is ideal for use in automotive and batteryoperated systems. The device operates from an input voltage of +3.5V to +30V, delivers up to 200mA of load current, and consumes only 20µA of quiescent current at no load. The input is +45V tolerant and is designed to operate under load-dump conditions. The MAX16910 can be user configured as either a fixed output voltage (+3.3V or +5V) or an adjustable output voltage using an external resistive divider. The MAX16910 features an open-drain, active-low RESET output with fixed thresholds offered at 92.5% and 87.5% of the output voltage. The RESET output remains low for a fixed period of 60µs after the output voltage exceeds its threshold. The RESET delay can be extended with an external capacitor. The MAX16910 includes an enable input short-circuit protection and thermal shutdown. Fixed Output-Voltage Mode The SET and SETOV inputs determine the output mode. For the 5V fixed output-voltage mode (see the 5V fixed output circuit in the Typical Operating Circuits), connect SET to GND and SETOV to OUT. For the 3.3V fixed output-voltage mode (see the 3.3V fixed output circuit in the Typical Operating Circuits) connect SET to GND and SETOV to GND. Adjustable Output-Voltage Mode For the adjustable output-voltage mode (see the adjustable output circuit in the Typical Operating Circuits), connect SET to IN or a voltage > 2.4V and connect SETOV to a resistive divider R1 and R2 between OUT and GND. An output voltage between 1.5V and 11V can be selected using the following equation: VOUT = VSETOV x (1 + R1/R2) where VSETOV = 1.25V and R2 should be less than or equal to 100kω. 10 ������������������������������������������������������������������������������������� 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator Thermal Protection The MAX16910 features thermal protection. When the junction temperature exceeds +180°C, an internal thermal sensor turns off the pass transistor, and allows the device to cool. The thermal sensor turns on the pass transistor again after the junction temperature cools by 25°C. This results in a cycled output during continuous thermal-overload conditions. Thermal protection protects the MAX16910 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of +150°C. Output Short-Circuit Current Limit The MAX16910 features a 330mA current limit. The output can be shorted to GND continuously without damage to the device. During a short circuit, the power dissipated across the pass transistor can quickly heat the device. When the die temperature reaches +180°C, the MAX16910 turns off the pass transistor and automatically restarts after the die temperature has cooled by 25°C. RESET Output The MAX16910 features an active-low, open-drain reset output. Once the monitored output voltage exceeds the reset threshold voltage, RESET remains low for the reset timeout period and then goes high. RESET changes from high to low whenever the monitored output voltage drops below the reset threshold voltage. RESET also asserts low when ENABLE is low and during thermal shutdown. where CTIMEOUT is in nF, ITO is in μA, and TTIMEOUT is in ms. For example, if ITO is 1μA, CTIMEOUT needs to be 8nF to get a 10ms delay. ___________Applications Information Output-Capacitor Selection and Regulator Stability For stable operation over the full temperature range, with fixed 3.3V and 5.0V output voltages, use a low-ESR 4.7μF capacitor. For resistor-programmed output voltages, a 10μF low-ESR ceramic capacitor is recommended for stable operation. Use larger output-capacitor values such as 22μF to reduce noise, improve load-transient response and power-supply rejection. Some ceramic dielectrics exhibit large capacitance and ESR variations with temperature. To improve power-supply rejection and transient response, use a capacitor larger than the minimum 1μF capacitor between IN and GND. Available Output-Current Calculation The MAX16910 provides up to 200mA of continuous output current. The input voltage range extends to 30V. Package power dissipation limits the amount of output current available for a given input/output voltage and ambient temperature. Figure 1 shows the maximum allowable power dissipation for these devices to keep the junction temperature below +150°C. Figure 1 assumes that the exposed metal pad of the MAX16910 is soldered to a 1in2 of multilayer copper board. Use Figure 1 to determine the allowable package dissipation for a given ambient temperature. Alternately, use the following formulas to calculate the allowable power dissipation PD. For the TDFN-EP package: 1.951W for TA ≤ +70°C PD = W 1.951W − 0.0244 °C × ( TA − 70°C) for + 70°C ≤ TA < +125°C Timeout The MAX16910 features a reset timeout period adjustable input. The internal capacitance produces a 60µs default delay when TIMEOUT is left unconnected. Connect a capacitor from TIMEOUT to GND to set a higher timeout period than default. Use the following formula to determine the reset timeout capacitor: For the SO-EP package: 1.861W for TA ≤ +70°C PD = W 1.861W − 0.0233 °C × ( TA − 70°C) for + 70°C ≤ TA < +125°C CTIMEOUT = 0.8 x ITO x TTIMEOUT ______________________________________________________________________________________ 11 MAX16910 ENABLE ENABLE is an active-high, logic-level enable input that turns the device on or off. Drive ENABLE high to turn the device on. An internal 0.65μA pulldown current keeps the MAX16910 in shutdown mode when driven by a three-state driver in high-impedance mode, or an open-drain driver. When in shutdown, the MAX16910 consumes only 1.6μA. ENABLE withstands voltages up to 45V, allowing it to be driven by high-input level voltages or connected to IN for always-on operation. After determining the allowable power dissipation, calculate the maximum allowable output current, without exceeding the +150°C junction temperature, using the following formula: IOUT(MAX) = PD VIN − VOUT The above equations do not include the negligible power dissipation from self-heating due to the device ground current. Example 1 (TDFN-EP Package): TA = +125°C, VIN = 16V, VOUT = 3.3V Calculate the maximum allowable power dissipation at the given temperature as follows: W PD = 1.951W − 0.0244 × (125°C − 70°C) = 609mW °C And establish the maximum output current: I OUT(MAX) = 609mW ≅ 48mA 16V − 3.3V Selecting Timeout Capacitor The reset timeout period is adjustable to accommodate a variety of microprocessor applications. Adjust the reset timeout period by connecting a capacitor between TIMEOUT and GND. t RP = 1.25 × C TIMEOUT I TO where tRP is in ms and CTIMEOUT is in nF. Leave TIMEOUT unconnected to select the internally fixed timeout period. CTIMEOUT must be a low-leakage (< 10nA) type capacitor. Ceramic capacitors are recommended; do not use capacitor values lower than 100pF to avoid the influence of parasitic capacitances. Exposed Pad The MAX16910 package features an exposed thermal pad on its underside that should be used as a heatsink. This pad lowers the package’s thermal resistance by providing a direct heat-conduction path from the die to the PCB. Connect the exposed pad and GND to the system ground using a large pad or ground plane, or multiple vias to the ground plane layer. Example 2 (TDFN-EP Package): TA = +50°C, VIN = 9V, VOUT = 5V 2.4 Calculate the maximum allowable power dissipation at the given temperature as follows: 2.2 2.0 PD = 1.951W Find the maximum output current: IOUT(MAX) = 1.951W = 488mA ⇒ IOUT(MAX) = ISC = 330mA (typ) 9V − 5V 1.951W 8-PIN TDFN-EP 1.8 1.861W 8-PIN SO-EP 1.6 DERATE 24.4mW/°C 1.4 PD (W) MAX16910 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator 1.2 DERATE 23.3mW/°C 1.0 0.8 In Example 2, the maximum output current is calculated as 488mA. The allowable output current cannot exceed the given internal current limit for the device of 330mA (typ). 0.6 0.4 0.2 0 0 20 40 60 80 100 120 140 TEMPERATURE (°C) Figure 1. Calculated Maximum Power Dissipation vs. Ambient Temperature 12 ������������������������������������������������������������������������������������� 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator PART RESET THRESHOLD (%) IOUT (mA) PIN-PACKAGE MAX16910CATA8/V+ 87.5 200 8 TDFN-EP* (3mm x 3mm) MAX16910CATA9/V+ 92.5 200 8 TDFN-EP* (3mm x 3mm) MAX16910CASA8/V+ 87.5 200 8 SO-EP* (5mm x 4mm) MAX16910CASA9/V+ 92.5 200 8 SO-EP* (5mm x 4mm) +Denotes a lead(Pb)-free/RoHS-compliant package. /V Denotes an automotive qualified part. *EP = Exposed pad. __________________________Chip PROCESS: BiCMOS DMOS Package Information Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 8 TDFN-EP T833+2 21-0137 8 SO-EP S8E+12 21-0111 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 © 2009 Maxim Integrated Products 13 Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX16910 ________________________________________________________________Selector Guide