MAX20011E AD | Alldatasheet

Document overview

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Technical content

The MAX20011E/MAX20011F/MAX20011G are high-effi - ciency, synchronous step-down converters that operate with a 3.0V to 5.5V input voltage range and supply a 0.5V to 1.275V output voltage range. The wide input/output voltage range and ability to provide up to 16A peak output current make these devices ideal for on-board point-of- load and post-regulation applications. The MAX20011E/ MAX20011F/MAX20011G achieve ±1.5% output error over load, line, and temperature ranges. The MAX20011E/MAX20011F/MAX20011G feature a 2.2MHz fixed-frequency PWM mode for better noise im- munity and load-transient response. The 2.2MHz frequen- cy operation allows for the use of all ceramic capacitors and minimizes external components. The spread-spec - trum frequency modulation option minimizes radiated electromagnetic emissions. Integrated low R DS(on) switches improve efficiency at heavy loads and make lay- out simpler than discrete solutions. The MAX20011E/MAX20011F/MAX20011G are offered with factory-preset output voltage. The I 2C interface sup- ports dynamic voltage adjustment with programmable slew rates. Other features include programmable soft- start, overcurrent, and overtemperature protections.

Applications

  • Automotive ADAS Systems
  • SoC Core Power Benefits and Features
  • High Efficiency DC-DC Converter
  • Up to 16A Peak Output Current
  • MAX20011E: IMAX = 8A
  • MAX20011F: IMAX = 12A
  • MAX20011G: IMAX = 16A
  • Differential Remote Voltage Sensing
  • 3.0V to 5.5V Operating Supply Voltage
  • I2C-Controlled Output Voltage:
  • 0.5V to 1.275V in 6.25mV Steps
  • Excellent Load-Transient Performance
  • Programmable Compensation
  • 2.2MHz or 1.1MHz Operation
  • ±1.5% Output Voltage Accuracy (Full Range)
  • ±1% Output Voltage Accuracy (Fixed 1V) RESET Output
  • Current-Mode, Forced PWM Operation
  • ASIL D Compliant:
  • Redundant Reference
  • BIST Diagnostics
  • PEC on I2C
  • Programmable OV/UV with ±1% Accuracy
  • Overtemperature and Short-Circuit Protection
  • 3.5mm x 4mm, 17-Pin Side-Wettable FC2QFN
  • -40°C to +125°C Grade 1 Automotive Temperature Range Simplified Block Diagram PV LX PV PGND EN RESET RS+ VOUT SDA SCL SYNC RS- AV PGND GND PV 2.2µF 70nH 10kΩ 375µF 1kΩ VL VL BST 0.1μF 4x10µF Click here to ask an associate for production status of specific part numbers. MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters Ordering Information appears at end of data sheet. 19-101225; Rev 0; 8/21 © 2022 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 2

Continuous Power Dissipation 17-FC2QFN (TA = +70°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. Recommended Operating Conditions PARAMETER SYMBOL CONDITION TYPICAL RANGE UNIT Ambient Temperature Range -40 to +125 °C Note: These limits are not guaranteed.

Package Information

17 FC2QFN

Land Pattern Number 90-100190 Thermal Resistance, Four-Layer Board: Junction to Ambient (θJA) 35.3°C/W Junction to Case (θJC) 7.9°C/W Thermal Resistance, EV Kit (Eight-Layer Board): Junction to Ambient (θJA) 23°C/W Junction to Case (θJC) 6.1°C/W 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 thermal resistances were obtained using the EV-Kit, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.

Electrical Characteristics

(VPV = VAV = 5V, T J = -40°C to +150°C, unless otherwise noted, typical values are at T A = +25°C under normal conditions unless otherwise noted. (Note 1, Note 2, and Note 4)) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY VOLTAGE PV Supply Voltage VPV 3.0 5.5 V AV Supply Voltage VAV Fully Operational 3.0 5.5 V MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 5

Electrical Characteristics (continued) (VPV = VAV = 5V, T J = -40°C to +150°C, unless otherwise noted, typical values are at T A = +25°C under normal conditions unless otherwise noted. (Note 1, Note 2, and Note 4)) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS UVLO Rising 2.7 2.9 V Falling 2.45 2.6 Supply Current IIN EN = high, IOUT = 0mA, no switching 2.5 mA Shutdown Supply Current IIN EN = low, TA ≤ +125°C 3 30 μA PWM FREQUENCY PWM Switching Frequency FSW Internally generated, CONFIG.FSW = 0 2.0 2.2 2.4 MHz Internally generated, CONFIG.FSW = 1 1.0 1.1 1.2 Spread Spectrum CONFIG.SS = 1 +3 % OUTPUT VOLTAGE Voltage Accuracy VOUT ILOAD = 0A to IMAX, VPV =3.3V, VOUT = 1.0V -1 +1 ILOAD = 0A to IMAX, 3.0V ≤ VPV ≤ 5.5V, 0.80V to 1.275V -1.5 +1.5 ILOAD = 0A to IMAX, 3.0V ≤ VPV ≤ 5.5V, 0.50V to 0.79V -15 15 mV OV Threshold Range 102.5 110 % OV Threshold Accuracy Percentage of nominal output, VOUT = VSET (0.8V - 1.275V) -1 +1 % VOUT = VSET (0.5V - 0.79V) -10 10 mV UV Threshold Range 97.5 90 % UV Threshold Accuracy Percentage of nominal output, VOUT VOUT = VSET (0.5V - 0.79V) -10 +10 mV UV/OV Propagation Delay VOUT = VSET 15 μs Active Timeout Period Option 1 (32768 clocks) 14.9 ms Option 2 (16384 clocks) 7.4 Option 3 (8192 clocks) (default) 3.7 Option 4 (1024 clocks) 0.5 POWER FET HS nMOS Current-Limit Threshold MAX20011E (8A) ( Note 3) 11.8 15 18.2 A MAX20011G (16A) (Note 3) 20 24 28 LX Leakage Current VPV = VAV = 5V, LX = PGND or PV, TA = +25°C 1 μA LX Discharge Resistance VEN = 0V, ILOAD = 10mA 11 Ω THERMAL OVERLOAD Thermal Shutdown Temperature TJ rising 165 °C Hysteresis 15 °C MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 6

Electrical Characteristics (continued) (VPV = VAV = 5V, T J = -40°C to +150°C, unless otherwise noted, typical values are at T A = +25°C under normal conditions unless otherwise noted. (Note 1, Note 2, and Note 4)) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL OUTPUT (RESET, SYNC, SDA) RESET Output Low Level 3.0V ≤ VPV ≤ 5.5V, 3.0V ≤ VAV ≤ 5.5V, ISINK = 2mA 0.4 V RESET High Leakage current 1 μA SYNC Output High Level VOH ISOURCE = 3mA 4.2 V SYNC Output Low Level VOL ISINK = 3mA 0.4 V SDA Ouput Low Level VOL_SDA ISINK = 4mA 0.4 V I2C INTERFACE Clock Frequency 1.0 MHz Setup Time (Repeated) START tSU:STA 260 ns HOLD Time (Repeated) START tHD:STA 260 ns SCL Low Time tLOW 500 ns SCL High Time tHIGH 260 ns DATA Setup Time tSU:DAT 50 ns DATA Hold Time tHD:DAT 0 ns Setup Time for STOP Condition tSU:STO 260 ns Spike Suppression 20 ns DIGITAL INPUT (SYNC) Input High level VIH 1.8 V Input Low level VIL 0.4 V SYNC Input Pull-down 100 kΩ SYNC Input Frequency Range fOSC = 2.2MHz 1.8 2.6 MHz fOSC = 1.1MHz 0.9 1.3 DIGITAL INPUT (EN, SDA, SCL) Input High Level 1.3 V Input Low Level 0.5 V Input Hysteresis 50 mV Input Leakage Current 1 μA Note 1: All units are 100% production tested at +25°C. All temperature limits are guaranteed by design and characterization. Note 2: The device is designed to operate under in cabin automotive temperature profiles similar to Typical Operating Characteristics Note 3: Based on ATE measurements using scaled currents. Note 4: The device is designed for continuous operation up to TJ = +125°C for 95,000 hours and TJ = +150°C for 5,000 hours. MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 7

Typical Operating Characteristics (VPV = VAV = 5V; TA=25°C unless otherwise noted) MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 8

Typical Operating Characteristics (continued) (VPV = VAV = 5V; TA=25°C unless otherwise noted) Pin Configuration 5 6 7 121314151617 EP SCL SDA AV GND RESET SYNC RS+ RS- PV PGND PGND LX EN BST PV PGND PGND TOP VIEW F173A4FY+2 MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 9

1 EN Active-High Enable Input. Drive EN HIGH for normal operation. On the rising edge the device enters soft-start, and on the falling edge the device enters soft-shutdown.

2 BST Boost Supply

3, 9 PV Power Input Supply. Connect two 10μF or larger ceramic capacitor from PV to PGND. Connect all PV pins together. 4, 5, 7, 8 PGND Power Ground. Connect all PGND pins together. 6 LX Inductor Connection. Connect LX to the switched side of the inductor. Connect all LX pins together. 10 RS- Buck Regulator Remote Voltage Sense Negative Input. The common-mode range of this input is ±0.3V.

11 RS+

Buck Regulator Remote Voltage Sense Positive Input. The resistance from RS+ to the remote sense connection should be kept to 2Ω or less to prevent the input current from affecting the output accuracy. The input current is +100μA (typ).

12 SYNC

SYNC I/O. Connect SYNC to AV/GND or an external clock to enable fixed-frequency, forced- PWM-mode operation. When configured as an output (CONFIG.SO[1:0] = 2’b10) connect SYNC to other devices' SYNC inputs. RESET Open–Drain RESET Output. This output remains low for the programmed hold time after the output has reached its regulation level (see the Electrical Characteristics table). To obtain a logic signal, pull up RESET with an external resistor.

14 GND Analog Ground

15 AV Analog Input Supply

16 SDA I2C Data I/O

17 SCL I2C Clock Input

— EP Internally Connected to PV. Connect EP to PV. MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 10

VID[7:0] VID[7:0] RS- GND AGND BST VREF2 PV UV[x] OV[x] OV OV 8-BIT DAC VID[7:0] OV VREF2 MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 11

The MAX20011E/MAX20011F/MAX20011G are high-efficiency, synchronous step-down converters that operate with to 16A of load current and regulate the output voltage over load, line, and temperature ranges. Optional spread- spectrum frequency modulation minimizes radiated electromagnetic emissions due to the switching frequency. The I 2C programmable I/O (SYNC) enables system synchronization. Integrated low RDS ON switches help improve efficiency at heavy loads and make the layout a much simpler task with respect to discrete solutions. The device is offered with a factory-preset output voltage that is dynamically adjustable through the I 2C interface. The output voltage can be set to any desired values between 0.5V to 1.275V in 6.25mV steps. Additional features include adjustable soft-start, power- good delay, DVS rate, overcurrent, and overtemperature protections. See the Internal Block Diagram. RESET Output The MAX20011E/MAX20011F/MAX20011G feature an open-drain RESET output that asserts when the output voltage deviates from the target regulated voltage by a programmed amount. RESET remains asserted for a fixed timeout period after the output is within the programmed regulation window. Connect RESET to a pullup resistor. Soft-Start The MAX20011E/MAX20011F/MAX20011G include a programmable soft-start feature to limit start-up inrush current by forcing the output voltage to slowly ramp up towards its regulation point. The soft-start slew rate is set in the SLEW register. Dynamic Voltage Scaling The step-down regulator features dynamic voltage scaling (DVS) to allow loads to margin their supply voltage. The output voltage is set with VID[7:0]. The slew rate during DVS is adjustable with SR[3:0] in the SLEW register. The OV/UV comparators are masked to prevent false RESET assertions during the DVS period. Shutdown During shutdown, the output voltage is ramped down at the programmed soft-start slew rate. After soft-shutdown is complete, a 11Ω pulldown resistor is enabled to discharge the remaining output voltage. Spread-Spectrum Option The MAX20011E/MAX20011F/MAX20011G feature spread-spectrum (SS) operation to vary the internal operating frequency by +3% relative to the internally generated operating frequency of 2.2MHz or 1.1MHz (typ). This function does not apply to an externally applied oscillation frequency. Synchronization (SYNC) SYNC is a factory-programmable I/O. When SYNC is configured as an input, a logic-high on PWM enables SYNC to (CONFIG.FSW = 1). When SYNC is configured as an output, SYNC outputs the internal PWM switching frequency. Current Limit/Short-Circuit Protection The devices feature current limiting that protects the device against short-circuit and overload conditions at the output. In the event of an overload condition, the output falls out of regulation and is VOUT = ILIM × RLOAD. In this condition, if the junction temperature exceeds approximately +165°C (typ), a thermal overload circuit turns off the device. The IC turns on again after the junction temperature cools by approximately 15°C. In the event of a short-circuit condition, the high-side MOSFET will reach the high-side MOSFET’s current-limit threshold and turn off. The converter then turns on the low-side MOSFET to allow the inductor current to ramp down. Once the inductor current falls below the low-side MOSFET valley current-limit threshold, the converter allows the high-side MOSFET to turn on again. This cycle repeats until the short- circuit condition is removed. MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 12

When the device is enabled, the boost capacitor must be charged. This occurs by turning on the low-side FET before initiating soft-start. Overtemperature Protection Thermal-overload protection limits the total power dissipation in the MAX20011E/MAX20011F/MAX20011G. When the junction temperature exceeds +165°C (typ), an internal thermal sensor shuts down the internal bias regulator and the step-down controller, allowing the IC to cool. The thermal sensor turns on the IC again after the junction temperature cools by 15°C. MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 13

The input filter capacitor reduces peak currents drawn from the power source and reduces noise and voltage ripple on the input caused by the circuit’s switching. The input capacitor RMS current requirement (IRMS) is defined by the following equation: IRMS = ILOAD(MAX) √VOUT(VPV − VOUT) VPV IRMS has a maximum value when the input voltage equals twice the output voltage (V PV = 2VOUT), so I RMS(MAX) = ILOAD(MAX) / 2. Choose an input capacitor that exhibits less than +10°C self-heating temperature rise at the RMS input current for optimal long-term reliability. The input voltage ripple is comprised of ΔVQ (caused by the capacitor discharge) and ΔVESR (caused by the ESR of the capacitor). Use low-ESR ceramic capacitors with high ripple current capability at the input. Assume the contribution from the ESR and capacitor discharge to be equal to 50%. Calculate the input capacitance and ESR required for a specified input voltage ripple using the following equations: ESRIN = ∆ VESR IOUT + ∆ IL Where, ∆ IL = (VPV − VOUT) × VOUT VPV × fSW × L And CIN = IOUT × D(1 − D) ∆ VQ × fSW and D = VOUT VPV IOUT is the maximum output current, and D is the duty cycle. Inductor Selection Three key inductor parameters must be specified for operation with the MAX20011E/MAX20011F/MAX20011G: inductance value (L), peak inductor current (I PEAK), and inductor saturation current (I SAT). The minimum required inductance is a function of operating frequency, input-to-output voltage differential, and the maximum output current capability of the output. A lower inductor value minimizes size and cost, thus improving large-signal and transient response, but reduces efficiency due to higher peak currents and higher peak-to-peak output-voltage ripple for the same output capacitor. On the other hand, a higher inductance increases efficiency by reducing the ripple current. Resistive losses due to extra wire turns can exceed the benefit gained from lower ripple current levels, especially when the inductance is increased without also allowing for larger inductor dimensions. The MAX20011E/MAX20011F/ MAX20011G are designed for ΔIP-P equal to 20% to 40% of the full load current. Use the following equation to calculate the inductance: LMIN1 = (VPV − VOUT) · VOUT VPV · fSW · IMAX · 40 % VPV and VOUT are typical values so that efficiency is optimum for typical conditions. The switching frequency is typically 2.2MHz or 1.1MHz. See the Output Capacitor section to verify that the worst-case output ripple is acceptable. The inductor saturation current is also important to avoid runaway current during continuous output short circuit. MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 14

Table 1. Inductor Selection Parameters VPV Nominal Input Voltage. Typically 3.3V or 5V. LTOL Inductor Tolerance. Typically ±20%. IMAX 8A, 12A, or 16A depending on part number. fSW Operating Frequency. This value is 2.2MHz or 1.1MHz unless externally synchronized to a different frequency. The maximum inductor value recommended is 1.75 times the chosen value from the above formula. Table 2. Recommended Inductor Values The actual peak-to-peak inductor ripple current is calculated in the ΔIL equation in the Input Capacitor section. where IMAX is 8A, 12A, or 16A. the phase margin with the fully derated output capacitance to ensure stability. AC performance with a lower output capacitance requirement.

parasitics when trying to maximize AC performance and/or minimize the output capacitance.

  • Input Capacitors: Use low-ESR/ESL ceramic capacitors. Place input capacitors across the PV and PGND pins symmetrically on both sides of the IC to minimize the high di/dt input switching current loop area. Smaller (1μF) capacitors should be close to the PV pin, as shown in Figure 1. This provides a shorter low inductance path for the higher frequency component of the switching current.
  • Output Capacitors: Use low-ESR/ESL ceramic capacitors. Connect the output capacitor return side to the PGND pin of the IC using a solid copper pour on the same layer or multiple plane/pour layers to minimize the impedance for the return path. For high-di/dt loads, some output capacitors must be placed close to the load. Connect all output capacitors to the VOUT and GND side with copper pour/planes to minimize the impedance.
  • RS+ (pin 11) and RS- (pin 10) are differential inputs. Route RS+/- sense lines differentially from the output capacitor to the IC pins. During layout, it is good practice to keep RS+/- traces in a different layer from the switching signal (for example, the LX and BST signals) and far away from other noisy signals to avoid noise-coupling issues with the RS+/- connection.
  • The placement and layout of the input RC filter for the analog supply AV (pin 15) is shown in Figure 1. Place a 2.2μF ceramic capacitor across the AV (pin 15) and GND (pin 14). Do not put any GND via between the capacitor and the IC GND (pin 14). Make a reference star type connection from the capacitor GND to the ground plane.
  • The BST capacitor trace from the LX pin to the BST pin should be as short as possible to minimize the inductance of the path carrying the BST charging current and high-side gate-drive current. RS+ RS- GND VIA PVR = 2.2Ω C = 2.2µF R = 0Ω R = 10Ω CIN COUT L TOP LAYER INNER LAYER BOTTOM LAYER CBST GND GND VOUT PVPV

Figure 1. Layout Example

Typical Application Circuit 4x10µF PV LX PV PGND EN RESET RS+ VOUT SDA SCL SYNC RS- AV PGND GND PV 2.2µF 70nH 375µF VL VL BST 0.1µF PV EP PV 10kΩ 1kΩ 10kΩ

Ordering Information

PART IOUT (A) VOUT (V) VMAX (V) SLEW COMP CONFIG CONFIG2 OV/UV RESET HOLD (ms) I2C MAX20011GAFOA/VY+ 16 0.825 1.025 0x09 0xE5 0x0C 0x00 0xFF 0.5 0x39 /VY Denotes side-wettable automotive-qualified parts. + Indicates a lead(Pb)-free/RoHS compliant package. Note: Contact factory for additional part options and custom configurations. Refer to the I2C register map for factory-selectable customer configurations. MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters www.analog.com Analog Devices | 17

Revision History

0 8/21 Initial release — Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. MAX20011E/MAX20011F/ MAX20011G Automotive Single 8A/12A/16A Step-Down Converters w w w . a n a l o g . c o m Analog Devices | 18