MAX5098AATJ+T Maxim Integrated Products, MAX5098AATJ+T Datasheet
MAX5098AATJ+T
Specifications of MAX5098AATJ+T
Related parts for MAX5098AATJ+T
MAX5098AATJ+T Summary of contents
Page 1
... Automotive AM/FM Radio Power Supply Automotive Instrument Cluster Display Pin Configuration appears at end of data sheet ________________________________________________________________ Maxim Integrated Products 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. o Wide 4.5V to 5.5V or 5.2V to 19V Input Voltage ...
Page 2
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection ABSOLUTE MAXIMUM RATINGS V+ to SGND............................................................-0.3V to +25V V+ to IN_HIGH...........................................................-19V to +6V IN_HIGH to SGND ..................................................-0.3V to +19V IN_HIGH Maximum Input Current .......................................60mA BYPASS to SGND..................................................-0.3V to +2.5V ...
Page 3
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection ELECTRICAL CHARACTERISTICS (continued) (VDRV = IN_HIGH = 5. IN_HIGH = 5.2V to 19V, EN_ = ...
Page 4
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection ELECTRICAL CHARACTERISTICS (continued) (VDRV = IN_HIGH = 5. IN_HIGH = 5.2V to 19V, EN_ = ...
Page 5
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection ELECTRICAL CHARACTERISTICS (continued) (VDRV = IN_HIGH = 5. IN_HIGH = 5.2V to 19V, EN_ = ...
Page 6
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection (See the Typical Application Circuit , unless otherwise noted that N1 is shorted externally.) OUTPUT1 EFFICIENCY vs. LOAD CURRENT 100 ...
Page 7
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection (See the Typical Application Circuit , unless otherwise noted that N1 is shorted externally.) LINE-TRANSIENT RESPONSE (BUCK CONVERTER) MAX5098A toc10 1ms/div CONVERTER 2 LOAD-TRANSIENT RESPONSE MAX5098A ...
Page 8
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection (See the Typical Application Circuit , unless otherwise noted that N1 is shorted externally.) OUT-OF-PHASE OPERATION (FSEL_1 = SGND) MAX5098A toc16 200ns/div EXTERNAL SYNCHRONIZATION (FSEL_1 = ...
Page 9
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection (See the Typical Application Circuit , unless otherwise noted that N1 is shorted externally.) BYPASS VOLTAGE vs. TEMPERATURE 2.010 5.5V ...
Page 10
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection (See the Typical Application Circuit , unless otherwise noted that N1 is shorted externally.) IN_HIGH CLAMP VOLTAGE vs. CLAMP CURRENT 20 +125°C A 20.2 ...
Page 11
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection PIN NAME Converter 2 Internal MOSFET Source Connection. For buck converter operation, connect SOURCE2 to the 1, 32 SOURCE2 switched side of the inductor. For boost operation, connect SOURCE2 ...
Page 12
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection PIN NAME 16 BYPASS Reference Output Bypass Connection. Bypass to SGND with a 0.22µF or greater ceramic capacitor. Converter 1 Frequency Select Input. Connect FSEL_1 FSEL_1 ...
Page 13
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection V+ MAX5098A IN_HIGH ON/OFF CONVERTER 1 MAXIMUM DUTY-CYCLE CKO1 OSCILLATOR FREQUENCY CONTROL BYPASS FREQUENCY FSEL_1 PWM DIVIDER COMPARATOR DIGITAL EN1 SOFT-START SYNC MAIN OSCILLATOR OVERVOLTAGE OSC VDRV CKO CKO2 ...
Page 14
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection Detailed Description The MAX5098A dual DC-DC converter uses a pulse- width-modulation (PWM) voltage-mode control scheme. On each converter the device includes one integrated n-channel MOSFET switch and requires an ...
Page 15
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection Internal Oscillator/Out-of-Phase Operation The internal oscillator generates the 180° out-of-phase clock signal required by each regulator. The switching frequency of each converter (f SW from 200kHz to 2.2MHz using ...
Page 16
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection DRAIN2 OUTPUT2 SOURCE2 SOURCE1 SYNC DUTY CYCLE = 50% CLKIN MASTER SYNC CKO (MASTER) CKO (SLAVE) SOURCE1 (MASTER) SYNC PHASE SOURCE2 (MASTER) SOURCE1 (SLAVE) SOURCE2 (SLAVE) ...
Page 17
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection DRAIN2 DRAIN1 OUTPUT2 SOURCE2 SOURCE1 MAX5098A FB2 FB1 V EN2 EN1 L PGOOD1 SEQUENCING—OUTPUT 2 DELAYED WITH RESPECT TO OUTPUT 1. Figure 2. Power-Supply ...
Page 18
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection Applications Information Setting the Switching Frequency The controller generates the clock signal by dividing down the internal oscillator f or the SYNC input sig- OSC nal when driven by ...
Page 19
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection Three key inductor parameters must be specified for operation with the MAX5098A: inductance value (L), peak inductor current (I ), and inductor saturation cur- L rent (I ). The ...
Page 20
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection where Δ ≅ Δ RIPPLE _ ESR ΔI is the peak-to-peak inductor current as calculated L above and f is the individual converter’s switching SW frequency. ...
Page 21
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection the capacitor discharge, and ΔV ESR due to the ESR of the capacitor. D duty cycle at minimum input voltage. Power Dissipation The MAX5098A includes two internal power MOSFET ...
Page 22
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection bandwidth and phase margin. Use a simple pole-zero pair (Type II) compensation if the output capacitor ESR zero frequency is below the unity-gain crossover fre- quency (f ). Type ...
Page 23
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection Place a zero Z 1 π × × where π × × ...
Page 24
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection Target the unity-gain crossover frequency for: f ZERO RHP , ≤ Place a zero π × × ...
Page 25
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection PCB Layout Guidelines Careful PCB layout is critical to achieve low switching losses and clean, stable operation. This is especially true for dual converters where one channel can affect ...
Page 26
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection Figure 7. 4.5V to 5.5V Operation 26 ______________________________________________________________________________________ ...
Page 27
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection ______________________________________________________________________________________ Typical Application Circuit 27 ...
Page 28
... 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. 28 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products ...