PDF MAX17491 Data sheet ( Hoja de datos )

Número de pieza	MAX17491
Descripción	Single-Phase Synchronous MOSFET Driver
Fabricantes	Maxim Integrated Products
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No Preview Available ! 19-5324; Rev 0; 6/10 EVAALVUAAILTAIOBNLEKIT www.DataSheet4U.com Single-Phase Synchronous MOSFET Driver General Description The MAX17491 is a single-phase synchronous nonin- verting MOSFET driver. The MAX17491 is intended to work with controller ICs like the MAX8736, MAX8786, or MAX17030 in multiphase notebook CPU core regulators. The regulators can either step down directly from the battery voltage to create the core voltage or step down from the main system supply. The single-stage conver- sion method allows the highest possible efficiency, while the 2-stage conversion at higher switching frequency provides the minimum possible physical size. The low-side driver is optimized to drive 3nF capacitive loads with 4ns/8ns typical fall/rise times, and the high- side driver with 8ns/10ns typical fall/rise times. Adaptive dead-time control prevents shoot-through cur- rents and maximizes converter efficiency. The MAX17491 features improved zero crossing and UVLO performance over the MAX8791/MAX8791B. The MAX17491 is available in a small, lead-free, 8-pin, 3mm x 3mm TQFN package. Applications Notebooks/Desktops/Servers CPU Core Power Supplies Multiphase Step-Down Converters Pin Configuration Features ♦ Single-Phase Synchronous MOSFET Driver ♦ 0.5Ω Low-Side On-Resistance ♦ 0.7Ω High-Side On-Resistance ♦ 10ns Minimum Guaranteed Dead Time ♦ Integrated Boost “Diode” ♦ 2V to 24V Input Voltage Range ♦ Selectable Pulse-Skipping Mode ♦ Low-Profile, 3mm x 3mm, TQFN Package Ordering Information PART TEMP RANGE PIN-PACKAGE MAX17491GTA+ -40°C to +105°C 8 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Typical Operating Circuit INPUT (VIN) 5V TO 24V TOP VIEW 65 LX 7 DH 8 MAX17491 + EP 12 4 DL 3 GND TQFN PWM DH PWM SKIP +5V BIAS SUPPLY SKIP BST LX MAX17491 VDD DL GND PAD VOUT (1.45V AT 20A) ________________________________________________________________ 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. 1 page www.DataSheet4U.com Single-Phase Synchronous MOSFET Driver Typical Operating Characteristics (continued) (Circuit of Figure 1, VDD = 5V, CDH = 3nF, CDL = 3nF, TA = +25°C, unless otherwise noted.) VPWM VDL VLX SWITCHING WAVEFORMS (PWM = MID TO LOW TO MID) MAX17491 toc11 5V 5V/div 0 5V 5V/div 0 0 10V/div 0 VDH 10V/div VPWM VDL VLX VDH SWITCHING WAVEFORMS (PWM = HIGH TO MID TO HIGH) MAX17491 toc12 5V 5V/div 0 0 5V/div 10V 10V/div 0 15V 10V/div 0 Pin Description PIN NAME FUNCTION 1 BST Boost Flying-Capacitor Connection. Gate-drive power supply for DH high-side gate driver. Connect a 0.1μF or 0.22μF capacitor between BST and LX. PWM Input. Noninverting DH control input from the controller IC: Logic-high: DH = high (BST), DL = low (PGND). Midlevel: After the midlevel hold time expires, the controller enters standby mode. DH and DL pulled 2 PWM low. Logic-low: DH = low (LX), DL = high (VDD) when SKIP = high. Internal pullup and pulldown resistors create the midlevel and prevent the controller from triggering an on-time if this input is left unconnected (not soldered properly) or driven by a high impedance. 3 GND Power Ground for the DL Gate Drivers and Analog Ground. Connect exposed pad to GND. 4 DL PWM Low-Side Gate-Driver Output. Swings between GND and VDD. DL forced high in shutdown. 5 VDD Supply Voltage Input for the DL Gate Drivers. Connect to 4.2V to 5.5V supply and bypass to GND with a 1μF ceramic capacitor. Active-Low Pulse-Skipping Mode. Enable pulse-skipping mode (zero-crossing comparator enabled) when the driver is operating in SKIP mode: 6 SKIP SKIP = VDD PWM mode SKIP = GND skip mode An internal pulldown current pulls the controller into the low-power pulse-skipping state if this input is left unconnected (not soldered properly) or driven by a high impedance. 7 LX Switching Node and Inductor Connection. Low-power supply for the DH high-side gate driver. LX connects to the skip-mode zero-crossing comparator. 8 DH External High-Side n-Channel MOSFET Gate-Driver Output. Swings between LX and BST. — EP Exposed Pad. Connect to ground through multiple vias to reduce the thermal impedance. _______________________________________________________________________________________ 5 5 Page www.DataSheet4U.com Single-Phase Synchronous MOSFET Driver PROCESS: BiCMOS Chip Information Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package draw- ings may show a different suffix character, but the drawing per- tains to the package regardless of RoHS status. PACKAGE TYPE 8 TQFN-EP PACKAGE CODE TQ833+1 OUTLINE LAND NO. PATTERN NO. 21-0136 90-0066 ______________________________________________________________________________________ 11 11 Page

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