LTC3890-1 Series

60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

Catalog

60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

Part	Number of Outputs	Duty Cycle (Max) [Max]	Control Features	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Topology	Output Configuration	Output Type	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Frequency - Switching [Max]	Frequency - Switching [Min]	Output Phases	Function	Mounting Type	Package / Case
Analog Devices LTC3890HUH-2#PBF	2	99 %	Enable Frequency Control Phase Control Power Good Soft Start Tracking	150 °C	-40 °C	32-QFN (5x5)	Buck SEPIC	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down Step-Up/Step-Down	Surface Mount
Analog Devices LTC3890HGN-1#TRPBF	2	99 %	Enable Frequency Control Power Good Soft Start Tracking	150 °C	-40 °C	28-SSOP	Buck	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down	Surface Mount	28-SSOP
Analog Devices LTC3890EGN-3#TRPBF	2	99 %	Enable Frequency Control Power Good Soft Start Tracking	125 ¯C	-40 °C	28-SSOP	Buck SEPIC	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down Step-Up/Step-Down	Surface Mount	28-SSOP
Analog Devices LTC3890MPUH#TRPBF	2	99 %	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	150 °C	-55 °C	32-QFN (5x5)	Buck	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down	Surface Mount
Analog Devices LTC3890MPGN-1#TRPBF	2	99 %	Enable Frequency Control Power Good Soft Start Tracking	150 °C	-55 °C	28-SSOP	Buck	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down	Surface Mount	28-SSOP
Analog Devices LTC3890HUH#TRPBF	2	99 %	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	150 °C	-40 °C	32-QFN (5x5)	Buck	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down	Surface Mount
Analog Devices LTC3890EUH-2#PBF	2	99 %	Enable Frequency Control Phase Control Power Good Soft Start Tracking	125 ¯C	-40 °C	32-QFN (5x5)	Buck SEPIC	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down Step-Up/Step-Down	Surface Mount
Analog Devices LTC3890MPUH#PBF	2	99 %	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	150 °C	-55 °C	32-QFN (5x5)	Buck	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down	Surface Mount
Analog Devices LTC3890EUH#TRPBF	2	99 %	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	125 ¯C	-40 °C	32-QFN (5x5)	Buck	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down	Surface Mount
Analog Devices LTC3890HGN-1#PBF	2	99 %	Enable Frequency Control Power Good Soft Start Tracking	150 °C	-40 °C	28-SSOP	Buck	Positive	Transistor Driver	60 V	4 V	535 kHz 835 kHz	105 kHz 350 kHz	2	Step-Down	Surface Mount	28-SSOP

Key Features

• Wide VINRange: 4V to 60V (65V Abs Max)

• Low Operating IQ: 50µA (One Channel On)

• Wide Output Voltage Range: 0.8V ≤ VOUT≤ 24V

• RSENSEor DCR Current Sensing

• Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise

• Phase-Lockable Frequency (75kHz to 850kHz)

• Programmable Fixed Frequency (50kHz to 900kHz)

• Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode®Operation at Light Loads

• Selectable Current Limit

• Very Low Dropout Operation: 99% Duty Cycle

• Adjustable Output Voltage Soft-Start or Tracking

• Power Good Output Voltage Monitors

• Output Overvoltage Protection

• Low Shutdown IQ: < 14µA

• Internal LDO Powers Gate Drive from VINor EXTVCC

• No Current Foldback During Start-Up

• Small Low Profile (0.75mm) 5mm × 5mm QFN Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3890 is a high performance dual step-down switching regulator DC/DC controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and noise due to the ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP®compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3890 features a precision 0.8V reference and power good output indicators. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries.Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads. For a leaded package version (28-lead Narrow SSOP), see the LTC3890-1 data sheet.LTC3890LTC3890-1LTC3890-2LTC3890-3Adjustable Current LimitLimitYesNoYesNoCLKOUT/PHASMD forMultiphase OperationYesNoYesNoNumber of PGoodOutputs2121OVP – Bottom GateCrowbarYesYesNoNoCurrent Limit FoldbackYesYesNoNoLight Load Operationwhen Synced to ExternalClockForced ContinuousForced ContinuousPulse SkippingPulse SkippingSENSE Pins CommonMode RangeCommon Mode < 0.5VRequires VFB < 0.65VCommon Mode < 0.5VRequires VFB < 0.65VNot Dependant onVFB. Easy to make anon-synchronousBoost or SEPICNot Dependant onVFB. Easy to make anon-synchronousBoost or SEPICPackage5 × 5 QFN-32SSOP-285 × 5 QFN-32SSOP-28ApplicationsAutomotive Always-On SystemsBattery Operated Digital DevicesDistributed DC Power Systems