EVALUATION KIT AVAILABLE MAX20021/MAX20022 Automotive Quad, Low-Voltage Step-Down DC-DC Converters General Description Benefits and Features Quad Step-Down DC-DC Converters with Integrated The MAX20021/MAX20022 power-management ICs FETs (PMICs) integrate four low-voltage, high-efficiency, step- Operate from 3.0V to 5.5V Supply Voltage down DC-DC converters. Each of the four outputs is factory or resistor programmable between 1.0V to 4.0V 1.0V to 4.0V Fixed or Adjustable Output Voltage and can deliver up to 1.0A of current. The PMICs operate 2.2MHz (MAX20022) or 3.2MHz (MAX20021) from 3.0V to 5.5V, making them ideal for automotive point- Switching Frequency of-load and post-regulation applications. Four Channels Capable of Delivering Up to 1A Each The PMICs feature fixed-frequency PWM-mode operation Designed to Improve Automotive EMI Performance with a switching frequency of 2.2MHz or 3.2MHz. High- Forced-PWM Operation frequency operation allows for an all-ceramic capacitor Two Channels 180 Out-of-Phase design and small-size external components. The low- SYNC Input resistance on-chip switches ensure high efficiency at Spread-Spectrum Option heavy loads while minimizing critical inductances, making Soft-Start and Supply Sequencing Reduces Inrush the layout a much simpler task with respect to discrete Current solutions. Internal current sensing and loop compensation Individual Enable Inputs and Power-Good Outputs to reduce board space and system cost. Simplify Sequencing The PMICs offer a spread-spectrum option to reduce OV/UV Input-Voltage Monitoring radiated emissions. Two of the four buck converters oper- Overtemperature and Short-Circuit Protection ate 180 out-of-phase with the internal clock. This feature reduces the necessary input capacitance and improves 28-Pin (5mm x 5mm x 0.8mm) TQFN-EP Package EMI as well. All four buck converters operate in constant- -40C to +125C Operating Temperature Range PWM mode outside the AM band. The PMICs offer a SYNC input to synchronize to an external clock. The PMICs provide individual enable inputs and power- Simplified Block Diagram good/reset outputs, as well as factory-programmable RESET times. V OUT1 The PMICs offer several important protection features MAX20021 10k including: input overvoltage protection, input undervoltage EN PG CONTROL monitoring, input undervoltage lockout, cycle-by-cycle SEL 5V current limiting, and overtemperature shutdown. The V A SYNC input undervoltage monitor indicates a brownout condition SS OSC 1F by driving PG low when the input falls below the UVM GND 5V threshold. 4 CHANNELS PV The MAX20021/MAX20022 PMICs are available in a 2.2F 28-pin TQFN package with an exposed pad and are specified for operation over the -40C to +125C automo- 1.5H LX STEP-DOWN VOUT tive temperature range. PWM OUT 10F 1.0V TO 4.0V UP TO Applications PGND 0.5A OR 1A Automotive OUTS EN Industrial Ordering Information/Selector Guide appear at end of data sheet. EP For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX20021.related. 19-6628 Rev 3 8/14MAX20021/MAX20022 Automotive Quad, Low-Voltage Step-Down DC-DC Converters Absolute Maximum Ratings PV to PGND .....................................................-0.3V to +6.0V ESD .................................................................................2kV HB V to GND ............................................................-0.3V to +6.0V ESD ..............................................................................200V A MM OUTS , EN , PG , SYNC, SEL to GND ......-0.3V to V + 0.3V Operating Temperature Range ..........................-40C to +125C A PV to PV ...........................................................-0.3V to +0.3V Junction Temperature ......................................................+150C PGND to GND ....................................................-0.3V to +0.3V Storage Temperature Range .............................-65C to +150C LX to PGND...............................................-1.0V to PV + 0.3V Lead Temperature (soldering, 10s) .................................+300C LX Continuous RMS Current ..............................................2.0A Soldering Temperature (reflow) .......................................+260C Output Short-Circuit Duration ....................................Continuous Continuous Power Dissipation (T = +70C) A TQFN (derate 28.6mW/C above +70C) ..................2285mW Package Thermal Characteristics (Note 1) TQFN Junction-to-Ambient Thermal Resistance ( ) ..............35C/W Junction-to-Case Thermal Resistance ( ) .....................3C/W JA JC 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.maximintegrated.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 (V = V = V = V = V = 5.0V T = T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C under A PV1 PV2 PV3 PV4 A J A normal conditions, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT GENERAL Supply Voltage Range V Fully operational 3.0 5.5 V PV No load, no switching, Supply Current I 2.5 3.8 5 mA PV0 V = V = V = V = V EN1 EN2 EN3 EN4 PV T = +25C 0.1 2 V = V = V = A EN1 EN2 EN3 Shut-Off Current I A VPSD V = V EN4 GND T = +125C 2 A Rising 5.6 5.8 6 Overvoltage Threshold V Hysteresis 0.1 V falling 4.15 4.3 4.45 PV Undervoltage Monitor Threshold UVM option enabled V V hysteresis 0.1 PV V falling 2.68 PV UVLO Threshold V V rising 3.0 PV Switching frequency = 2.2MHz 2.0 2.2 2.4 (see the Selector Guide ) PWM Switching Frequency f MHz SW Switching frequency = 3.2MHz 3.0 3.2 3.4 (see the Selector Guide) Spread-spectrum option = enabled Spread Spectrum Df/f +3 % (see the Selector Guide) Maxim Integrated 2 www.maximintegrated.com