LTC3828 Series

Dual, 2-Phase Step-Down Controller with Tracking

Catalog

Dual, 2-Phase Step-Down Controller with Tracking

Part	Control Features	Output Configuration	Topology	Supplier Device Package	Output Phases	Output Type	Number of Outputs	Package / Case [custom]	Package / Case	Package / Case [custom]	Frequency - Switching [Max]	Frequency - Switching [Min]	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Synchronous Rectifier	Clock Sync	Function	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Duty Cycle (Max) [Max]
Analog Devices LTC3828EG#PBF	Enable Phase Control Power Good Tracking	Positive	Buck	28-SSOP	2	Transistor Driver	2	0.209 in	28-SSOP	5.3 mm	550 kHz	260 kHz	Surface Mount	85 °C	-40 °C			Step-Down	4.5 V	28 V	99.4 %

Catalog

Dual, 2-Phase Step-Down Controller with Tracking

Key Features

• Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise

• Tracking for Both Outputs

• Constant Frequency Current Mode Control

• Wide VINRange: 4.5V to 28V Operation

• Power Good Output Voltage Indicator

• Adjustable Soft-Start Current Ramping

• Foldback Output Current Limiting-Disabled at Start-Up

• No Reverse Current During Soft-Start Interval

• Clock Output for 3-, 4-, 6-Phase Operation

• Dual N-Channel MOSFET Synchronous Drive

• ±1% Output Voltage Accuracy

• Phase-Lockable Fixed Frequency 260kHz to 550kHz

• OPTI-LOOP®Compensation Minimizes COUT

• Very Low Dropout Operation: 99% Duty Cycle

• Output Overvoltage Protection

• Small 28-Lead SSOP and 5mm × 5mm QFN Packages

Description

The LTC3828 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows for a phase-lockable frequency of up to 550kHz. The TRCKSS pin provides both soft-start and tracking functions. Multiple LTC3828s can be daisy-chained in applications requiring more than two voltages to be tracked.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 a wide 4.5V to 28V (30V maximum) input supply range, encompassing all battery chemistries.The RUN pins control their respective channels independently. The FCB/PLLIN pin selects among Burst Mode®operation, skip-cycle mode and continuous current mode. Current foldback limits MOSFET dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start.ApplicationsTelecom InfrastructureASIC Power SupplyIndustry Equipment