LTC3807 - Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability

The LTC®3807 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz.

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 LTC3807 features a precision 0.8V reference and power good output indicator. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The output voltage of the LTC3807 can be programmed between 0.8V to 24V.

The TRACK/SS pin ramps 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.

Features

Wide VIN Range: 4V to 38V (40V Abs Max)
Low Operating IQ: 50μA
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
RSENSE or DCR Current Sensing
Phase-Lockable Frequency (75kHz to 750kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Load
Selectable Current Limit
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Power Good Output Voltage Monitor
Output Overvoltage Protection
Low Shutdown IQ: 14μA
Internal LDO Powers Gate Drive from VIN or EXTVCC
No Current Foldback During Start-Up
Small 20-Pin 3mm × 4mm QFN and TSSOP Packages

Typical Application

Applications

Automotive Always-On Systems
Battery Powered Digital Devices
Distributed DC Power Systems

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3807EFE#PBF	TSSOP-20	E	$3.57	$2.50
LTC3807EFE#TRPBF	TSSOP-20	E		$2.56
LTC3807EUDC#PBF	3x4 QFN-20	E	$3.29	$2.30
LTC3807EUDC#TRPBF	3x4 QFN-20	E		$2.36
LTC3807HFE#PBF	TSSOP-20	H	$4.64	$3.25
LTC3807HFE#TRPBF	TSSOP-20	H		$3.31
LTC3807HUDC#PBF	3x4 QFN-20	H	$4.22	$2.95
LTC3807HUDC#TRPBF	3x4 QFN-20	H		$3.01
LTC3807IFE#PBF	TSSOP-20	I	$4.07	$2.85
LTC3807IFE#TRPBF	TSSOP-20	I		$2.91
LTC3807IUDC#PBF	3x4 QFN-20	I	$3.79	$2.65
LTC3807IUDC#TRPBF	3x4 QFN-20	I		$2.71
LTC3807MPFE#PBF	TSSOP-20	MP	$10.93	$7.65
LTC3807MPFE#TRPBF	TSSOP-20	MP		$7.71
LTC3807MPUDC#PBF	3x4 QFN-20	MP	$10.29	$7.20
LTC3807MPUDC#TRPBF	3x4 QFN-20	MP		$7.26

Demo Boards


Part Number	Description	Price
DC2221A	LTC3807EFE Demo Board \| Sync Buck, 16V ≤ VIN ≤ 38V; VOUT = 12V @ 15A	Contact Factory