LTC1876

PRODUCTION

High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator

Data Sheet Product Selection Table

Part Models: 2
1ku List Price: Starting From $7.45

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Overview

Step-Down Controller

Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
Power Good Output Voltage Indicator
OPTI-LOOP^™ Compensation Minimizes C_OUT
DC Programmed Fixed Frequency 150kHz to 300kHz
Wide V_IN Range: 3.5V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Latched Short-Circuit Shutdown with Defeat Option
Remote Output Voltage Sense and OV Protection
5V and 3.3V Standby Regulators
Selectable Const. Freq. or Burst Mode^™ Operation

Step-Up Regulator

High Operating Switching Frequency of 1.2MHz
Low Internal V_CESAT Switch: 400mV @ 1A, V_IN = 3V
Wide V_IN Range: 2.6V to 16V Operation
High Output Voltage: Up to 34V

The LTC1876 is a high performance triple output switching regulator. It incorporates a dual step-down switching controller that drives all N-channel synchronous power MOSFET stages. A step-up regulator with an internal 1A, 36V switch provides the third output.

The step-down controllers minimize power loss and noise by operating the output stage of each controller out of phase. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A RUN/SS pin for each controller provides both soft-start and an optional timed, short-circuit shutdown that can be configured to latch offone or both controllers. Current foldback provides additional short-circuit protection. In an overvoltage condition, the bottom MOSFET is latched on until V_OUT returns to normal. The FCB pin can be used to inhibit Burst Mode operation or to enable regulation of a secondary output voltage.

The step-up regulator operates at 1.2MHz, allowing the use of tiny low cost capacitors and inductors. In addition,its internal 1A switch allows high current outputs to be generated. Its current mode control scheme provides excellent line and load regulation.

Applications

3.3V Input Step-Down Converter
Notebook and Palmtop Computers, PDAs
Battery-Operated Digital Devices

Part Models: 2
1ku List Price: Starting From $7.45

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC1876EG#PBF	36-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1876EG#TRPBF	36-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Nov 18, 2019 - 19_0266 Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC
		PCN19_0266_Form Material_Report Detailed Parts List
LTC1876EG#PBF	PRODUCTION
LTC1876EG#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management