IC-Hersteller Maxim Integrated

IC-Hersteller (95)

Maxim Integrated MAX8792

Single Quick-PWM Step-Down Controller with Dynamic REFIN

Details

TopologieAbwärtswandler
Eingangsspannung7-24 V
Ausgang 11.05 V / 10 A
Ausgang 21.5 V / 10 A
IC-Revision1

Beschreibung

The MAX8792 pulse-width modulation (PWM) controller provides high efficiency, excellent transient response, and high DC-output accuracy needed for stepping down high-voltage batteries to generate low-voltagecore or chipset/RAM bias supplies in notebook computers. The output voltage can be dynamically controlled using the dynamic REFIN, which supports input voltages between 0 to 2V. The REFIN adjustability combinedwith a resistive voltage-divider on the feedback input allows the MAX8792 to be configured for any output voltage between 0 to 0.9VIN.Maxim’s proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios (low-duty-cycle applications) with ease and provides 100ns “instant-on” response toload transients while maintaining a relatively constant switching frequency. Strong drivers allow the MAX8792 to efficiently drive large synchronous-rectifier MOSFETs.The controller senses the current across the synchronous rectifier to achieve a low-cost and highly efficient valley current-limit protection. The adjustable currentlimit threshold provides a high degree of flexibility, allowing thermally compensated protection using an NTC or foldback current-limit protection using a voltage- divider derived from the output.The MAX8792 includes a voltage-controlled soft-start and soft-shutdown in order to limit the input surge current, provide a monotonic power-up (even into a precharged output), and provide a predictable powerup time. The controller also includes output fault protection—undervoltage and overvoltage protection—as well as thermal-fault protection.The MAX8792 is available in a tiny 14-pin, 3mm x 3mm TDFN package. For space-constrained applications, refer to the MAX17016 single step-down with 10A, 26V internal MOSFETs available in a small 40-pin, 6mm x6mm TQFN package.

Eigenschaften

  • Quick-PWM with Fast Transient Response
  • Supports Any Output Capacitor
  • No Compensation Required withPolymers/Tantalum
  • Stable with Ceramic Output Capacitors Using External Compensation
  • Precision 2V ±10mV Reference
  • Dynamically Adjustable Output Voltage (0 to 0.9VIN Range)
  • Feedback Input Regulates to 0 to 2V REFIN Voltage
  • 0.5% VOUT Accuracy Over Line and Load
  • 26V Maximum Input Voltage Rating
  • Adjustable Valley Current-Limit Protection
  • Thermal Compensation with NTC
  • Supports Foldback Current Limit
  • Resistively Programmable Switching Frequency
  • Overvoltage Protection
  • Undervoltage/Thermal Protection
  • Voltage Soft-Start and Soft-Shutdown
  • Monotonic Power-Up with Precharged Output
  • Power-Good Window Comparator

Typische Anwendungen

  • Step-Down Power Supply
  • Point-of-Load Applications
  • DDR Memory—VDDQ or VTT
  • I/O and Chipset Supplies
  • Notebook Computers

Weiterführende Informationen

Artikeldaten

Artikel Nr. Daten­blatt Simu­lation Downloads ProduktserieL
(µH)
IRP,40K
(A)
ISAT1
(A)
ISAT,30%
(A)
RDC
(mΩ)
fres
(MHz)
Material Muster
7443552100SPEC
8 Dateien WE-HCI SMT-Hochstrominduktivität 1 23.1 7.5 20 3.3 80 WE-PERM
Artikel Nr. Daten­blatt Simu­lation
7443552100SPEC
Muster
Artikel Nr. Daten­blatt Simu­lation Downloads ProduktserieL
(µH)
IRP,40K
(A)
ISAT1
(A)
ISAT,30%
(A)
RDC
(mΩ)
fres
(MHz)
Material Muster