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ADI LTC3728LEUH#PBF

Manufacturer
ADI
MPN
LTC3728LEUH#PBF
LCSC Part #
C685809
Packaging
QFN-32-EP(5x5)
Customer #
Key Attributes
2 Adjustable Step-down type QFN-32-EP(5x5) DC DC Switching Controllers RoHS
Datasheetpdf iconADI LTC3728LEUH#PBF
RoHS Compliance1 documents available
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QtyUnit Price(Reference Only)Total Amount
1+$ 8.0508$ 8.05
200+$ 3.1163$ 623.26
500+$ 3.0067$ 1503.35
1,000+$ 2.9527$ 2952.70
Standard Packaging73/Full Tube
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Products Specifications

All
TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/DC DC Switching Controllers
ManufacturerADI
PackagingQFN-32-EP(5x5)
Operating Temperature-40℃~+85℃@(TA)
Synchronous RectifierYes
FeaturesAdjustable soft-start;Overcurrent Protection;Protection latch;Frequency synchronization;Operating status indication;Built-in LDO regulator;Light load efficient mode
Output Current-
Number of Channels2
TopologyBuck
Frequency - Switching550kHz
Operating Voltage4.5V~28V
Output TypeAdjustable
Switch tube (built-in/external)External
Output Voltage-
FunctionStep-down type
Quiescent Current20uA
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Introduction

AI Translation

The LTC3728L/LTC3728LX are dual high performance step-down switching regulator controllers that drive all N‑channel synchronous power MOSFET stages. A constant-frequency, current mode architecture allows phase-lockable frequency of up to 550kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase.

OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with future microprocessor generations, and a wide 4.5V to 28V (30V maximum) input supply range encompasses all battery chemistries.

A RUN/SS pin for each controller provides both softstart and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when overcurrent latchoff is disabled. Output overvoltage protection circuitry latches on the bottom MOSFET until VOUT returns to normal. The FCB mode pin can select among Burst Mode, constant-frequency mode and continuous inductor current mode or regulate a secondary winding. The LTC3728L/LTC3728LX include a power good output pin that indicates when both outputs are within 7.5% of their designed set point.

Features

AI Translation
  • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • OPTI-LOOP Compensation Minimizes COUT
  • ±1% Output Voltage Accuracy (LTC3728LC)
  • Power Good Output Voltage Indicator
  • Phase-Lockable Fixed Frequency 250kHz to 550kHz
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4.5V to 28V Operation
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Soft-Start Current Ramping
  • Foldback Output Current Limiting
  • Latched Short-Circuit Shutdown with Defeat Option
  • Output Overvoltage Protection
  • Low Shutdown IQ: 20µA
  • 5V and 3.3V Standby Regulators
  • 3 Selectable Operating Modes: Constant-Frequency, Burst Mode Operation and PWM
  • 5mm × 5mm QFN and 28-Lead Narrow SSOP Packages

Applications

AI Translation
  • Notebook and Palmtop Computers
  • Telecom Systems
  • Portable Instruments
  • Battery-Operated Digital Devices
  • DC Power Distribution Systems