LTC3892 - 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

The LTC®3892/LTC3892-1/LTC3892-2 is a high performance dual step-down DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and noise are minimized by operating the two controller output stages out-of-phase.

The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes.

A wide 4.5V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Output voltages up to 99% of VIN can be regulated. OPTILOOP® compensation allows the transient response and loop stability to be optimized over a wide range of output capacitance and ESR values.

The 29μA no-load quiescent current extends operating run time in battery powered systems. For a comparision of the LTC3892 to the LTC3892-1 and LTC3892-2, see Table 1 in the Pin Functions section of this data sheet.

Features

Wide VIN Range: 4.5V to 60V (65V Abs Max)
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 99% • VIN
Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
No External Bootstrap Diodes Required
Low Operating IQ: 29μA (One Channel On)
Selectable Gate Drive UVLO Thresholds
Out-of-Phase Operation Reduces Required Input Capacitance and Power Supply Induced Noise
Phase-Lockable Frequency: 75kHz to 850kHz
Selectable Continuous, Pulse Skipping or Low Ripple Burst Mode® Operation at Light Loads
Selectable Current Limit (LTC3892/LTC3892-2)
Very Low Dropout Operation: 99% Duty Cycle
Power Good Output Voltage Monitors (LTC3892/LTC3892-2)
Low Shutdown IQ: 3.6μA
Small 32-Lead 5mm × 5mm QFN Package (LTC3892/ LTC3892-2) or TSSOP Package (LTC3892-1)

Typical Application

Applications

Automotive and Industrial Power Systems
Distributed DC Power Systems
High Voltage Battery Operated Systems

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3892EFE-1#PBF	TSSOP-28	E	$6.89	$4.82
LTC3892EFE-1#TRPBF	TSSOP-28	E		$4.88
LTC3892EUH-2#PBF	5x5 QFN-32	E	$7.06	$4.94
LTC3892EUH-2#TRPBF	5x5 QFN-32	E		$5.00
LTC3892EUH#PBF	5x5 QFN-32	E	$7.06	$4.94
LTC3892EUH#TRPBF	5x5 QFN-32	E		$5.00
LTC3892HFE-1#PBF	TSSOP-28	H	$8.31	$5.82
LTC3892HFE-1#TRPBF	TSSOP-28	H		$5.88
LTC3892HUH-2#PBF	5x5 QFN-32	H	$8.49	$5.94
LTC3892HUH-2#TRPBF	5x5 QFN-32	H		$6.00
LTC3892HUH#PBF	5x5 QFN-32	H	$8.49	$5.94
LTC3892HUH#TRPBF	5x5 QFN-32	H		$6.00
LTC3892IFE-1#PBF	TSSOP-28	I	$7.90	$5.53
LTC3892IFE-1#TRPBF	TSSOP-28	I		$5.59
LTC3892IUH-2#PBF	5x5 QFN-32	I	$7.91	$5.54
LTC3892IUH-2#TRPBF	5x5 QFN-32	I		$5.60
LTC3892IUH#PBF	5x5 QFN-32	I	$8.07	$5.65
LTC3892IUH#TRPBF	5x5 QFN-32	I		$5.71
LTC3892MPFE-1#PBF	TSSOP-28	MP	$21.34	$14.94
LTC3892MPFE-1#TRPBF	TSSOP-28	MP		$15.00
LTC3892MPUH-2#PBF	5x5 QFN-32	MP	$21.77	$15.24
LTC3892MPUH-2#TRPBF	5x5 QFN-32	MP		$15.30
LTC3892MPUH#PBF	5x5 QFN-32	MP	$21.77	$15.24
LTC3892MPUH#TRPBF	5x5 QFN-32	MP		$15.30

Demo Boards


Part Number	Description	Price
DC1998A	LTC3892EUHF Demo Board \| Dual Sync Buck Controller, 6V ≤ VIN ≤ 60V; VOUT1 = 5V @ 8A, VOUT2 = 12V @ 5A	$175.00
DC2190A-A	LTC3892EFE-1 Demo Board \| LTC3892-1(x2) 4-Phase Buck Controller, 16V ≤ VIN ≤ 55V; VOUT = 12V @ 60A	$275.00
DC2190A-B	LTC3892EFE-1 Demo Board \| 2-Phase Buck Controller, 16V ≤ VIN ≤ 55V; VOUT = 12V @ 30A	Contact Factory
DC2493A	LTC3892EUH-2 Demo Board \| 2-Phase Sync Buck Controller, 16V ≤ VIN ≤ 55V; VOUT = 12V @ 30A	$200.00