LTC3736-1 Series

Dual 2-Phase, No RSENSE™, Synchronous Controller with Spread Spectrum

Catalog

Dual 2-Phase, No RSENSE™, Synchronous Controller with Spread Spectrum

Part	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Package / Case [custom]	Topology	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Mounting Type	Output Configuration	Frequency - Switching [Min]	Frequency - Switching [Max]	Duty Cycle (Max) [Max]	Output Type	Number of Outputs	Output Phases	Function	Control Features
Analog Devices LTC3736EGN#PBF	24-SSOP	85 °C	-40 °C	24-SSOP	0.154 " 3.9 mm	Buck	2.75 V	9.8 V	Surface Mount	Positive	300 kHz	750 kHz	100 %	Transistor Driver	2	2	Step-Down	Current Limit Enable Power Good Soft Start Tracking
Analog Devices LTC3736EGN-1#PBF	24-SSOP	85 °C	-40 °C	24-SSOP	0.154 " 3.9 mm	Buck	2.75 V	9.8 V	Surface Mount	Positive	300 kHz	750 kHz	100 %	Transistor Driver	2	2	Step-Down	Current Limit Enable Frequency Control Power Good Soft Start Tracking
Analog Devices LTC3736EGN-2#PBF	24-SSOP	85 °C	-40 °C	24-SSOP	0.154 " 3.9 mm	Buck	2.75 V	9.8 V	Surface Mount	Positive	300 kHz	750 kHz	100 %	Transistor Driver	2	2	Step-Down	Current Limit Enable Power Good Soft Start Tracking
Analog Devices LTC3736EUF	24-QFN (4x4)	85 °C	-40 °C	24-WFQFN Exposed Pad		Buck	2.75 V	9.8 V	Surface Mount	Positive	300 kHz	750 kHz	100 %	Transistor Driver	2	2	Step-Down	Current Limit Enable Power Good Soft Start Tracking
Analog Devices LTC3736EUF-2#TRPBF	24-QFN (4x4)	85 °C	-40 °C	24-WFQFN Exposed Pad		Buck	2.75 V	9.8 V	Surface Mount	Positive	300 kHz	750 kHz	100 %	Transistor Driver	2	2	Step-Down	Current Limit Enable Power Good Soft Start Tracking
Analog Devices LTC3736EUF#TRPBF	24-QFN (4x4)	85 °C	-40 °C	24-WFQFN Exposed Pad		Buck	2.75 V	9.8 V	Surface Mount	Positive	300 kHz	750 kHz	100 %	Transistor Driver	2	2	Step-Down	Current Limit Enable Power Good Soft Start Tracking
Analog Devices LTC3736EGN-1#TRPBF	24-SSOP	85 °C	-40 °C	24-SSOP	0.154 " 3.9 mm	Buck	2.75 V	9.8 V	Surface Mount	Positive	300 kHz	750 kHz	100 %	Transistor Driver	2	2	Step-Down	Current Limit Enable Frequency Control Power Good Soft Start Tracking

Catalog

Dual 2-Phase, No RSENSE™, Synchronous Controller with Spread Spectrum

Key Features

• No Current Sense Resistors Required

• Out-of-Phase Controllers Reduce Required Input Capacitance

• Tracking Function

• Wide VINRange: 2.75V to 9.8V

• 0.6V ±1% Voltage Reference

• High Current Limit

• Constant Frequency Current Mode Operation

• Low Dropout Operation: 100% Duty Cycle

• True PLL for Frequency Locking or Adjustment

• Selectable Pulse Skipping/Forced Continuous Operation

• Auxiliary Winding Regulation

• Internal Soft-Start Circuitry

• Power Good Output Voltage Monitor

• Output Overvoltage Protection

• Micropower Shutdown: IQ= 9μA

• Tiny Low Profile (4mm × 4mm) QFN and narrow SSOP packages.

Description

The LTC3736-1 is a 2-phase dual synchronous stepdown switching regulator controller with tracking that drives external complementary power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDSsensing eliminates the need for sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are minimized by operating the two controllers out of phase.A unique spread spectrum architecture randomly varies the LTC3736-1’s switching frequency from 450kHz to 580kHz, significantly reducing the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.Pulse skipping operation provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems. The high switching frequencies allow for the use of small surface mount inductors and capacitors.The LTC3736-1 is available in the low profile (0.75mm) 24-pin thermally enhanced (4mm × 4mm) QFN package and 24-lead narrow SSOP packages.Max Current Sense VoltageBurst ModeSoft StartSpread SpectrumLTC3736204mVYesNoNoLTC3736-1204mVNoNoYesLTC3736-2345mVNoYesNoApplicationsOne or Two Lithium-Ion Powered DevicesNotebook and Palmtop Computers, PDAsPortable InstrumentsDistributed DC Power Systems