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IC-Hersteller Analog Devices

Analog Devices ADP1873

Synchronous Current-Mode with Constant On-Time, PWM Buck Controller

Details

TopologieAbwärtswandler
Eingangsspannung2.75-20 V
Schaltfrequenz300-1000 kHz
Ausgang 10.6 V
IC-RevisionB

Beschreibung

The ADP1872/ADP1873 are versatile current-mode, synchronous step-down controllers that provide superior transient response, optimal stability, and current limit protection by using a constant on-time, pseudo-fixed frequency with a programmable current-sense gain, current-control scheme. In addition, these devices offer optimum performance at low duty cycles by using valley current-mode control architecture. This allows the ADP1872/ADP1873 to drive all N-channel power stages to regulate output voltages as low as 0.6 V.

The ADP1873 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the Power Saving Mode (PSM) Version (ADP1873) section for more information).Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option), the ADP1872/ADP1873 are well suited for a wide range of applications. These ICs not only operate from a 2.75 V to 5.5 V bias supply, but can also accept a power input as high as 20 V.In addition, an internally fixed, soft start period is included to limit input in-rush current from the input supply during startup and to provide reverse current protection during soft start for a pre-charged output. The low-side current-sense, current-gain scheme and integration of a boost diode, along with the PSM/forced pulse-width modulation (PWM) option, reduce the external part count and improve efficiency.The ADP1872/ADP1873 operate over the −40°C to +125°C junction temperature range and are available in a 10-lead MSOP.

Eigenschaften

  • Power input voltage as low as 2.75 V to 20 V
  • Bias supply voltage range: 2.75 V to 5.5 V
  • Minimum output voltage: 0.6 V
  • 0.6 V reference voltage with ±1.0% accuracy
  • Supports all N-channel MOSFET power stages
  • Available in 300 kHz, 600 KHz, and 1.0 MHz options
  • No current-sense resistor required
  • Power saving mode (PSM) for light loads (ADP1873 only)
  • Resistor-programmable current-sense gain
  • Thermal overload protection
  • Short-circuit protection
  • Precision enable input
  • Integrated bootstrap diode for high-side drive
  • 140 μA shutdown supply current
  • Starts into a precharged load
  • Small, 10-lead MSOP package

Remarks:1.Table 7. Recommended InductorsRefer page no.23 And 31

2.Table 8. External Component Values RecommendedRefer page no.30

Typische Anwendungen

  • Telecom and networking systems
  • Mid to high end servers
  • DSP core power supplies
  • Set-top boxes

Weiterführende Informationen

Artikeldaten

Artikel Nr. Daten­blatt Downloads ProduktserieL
(nH)
IR
(A)
LR
(nH)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
MaterialVersion Muster
744303012SPEC
9 Dateien WE-HCM SMT-Hochstrominduktivität 120 31 118 55 0.325 150 MnZn
744303022SPEC
9 Dateien WE-HCM SMT-Hochstrominduktivität 220 31 180 30 0.325 80 MnZn
744355147SPEC
9 Dateien WE-HCI SMT-Hochstrominduktivität 470 30 410 50 0.67 100 WE-PERM SMT
744325072SPEC
9 Dateien WE-HCI SMT-Hochstrominduktivität 720 22 600 35 1.3 115 Superflux SMT
744355090SPEC
9 Dateien WE-HCI SMT-Hochstrominduktivität 900 24 660 28 1.6 72 WE-PERM SMT
7443552100SPEC
9 Dateien WE-HCI SMT-Hochstrominduktivität 1000 16 780 20 3.3 80 WE-PERM SMT
744325120SPEC
9 Dateien WE-HCI SMT-Hochstrominduktivität 1200 20 1000 25 1.8 75 Superflux SMT
7443551200SPEC
9 Dateien WE-HCI SMT-Hochstrominduktivität 2000 23 1400 22 2.6 45 WE-PERM SMT
Muster
Artikel Nr. Daten­blatt Downloads ProduktserieL
(nH)
IR
(A)
LR
(nH)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
MaterialVersion Muster