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LTC3717-1 - Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination

Datasheet

Documentation

Features

V_OUT = 1/2 V_REF
Adjustable and Symmetrical Sink/Source Current Limit up to 20A
True Current Mode Control with Optional Use of Sense Resistor
V_ON and I_ON Pins Allow Constant Frequency Operation During Input and Output Voltage Changes
±0.65% Output Voltage Accuracy
Up to 97% Efficiency
Ultrafast Transient Response
2% to 90% Duty Cycle at 200kHz
t_ON(MIN) </= 100ns
Stable with Ceramic C_OUT
Power Good Output Voltage Monitor
Wide V_IN Range: 4V to 36V
Adjustable Switching Frequency up to 1.5MHz
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Available in a 5mm x 5mm QFN Package

Typical Application

Description

The LTC3717-1 is a synchronous step-down switching regulator controller for double data rate (DDR) and Quad Data Rate (QDR) memory termination. The controller uses a valley current control architecture to deliver very low duty cycles with or without a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in V_IN and V_OUT.

Forced continuous operation reduces noise and RF interference. Output voltage is internally set to half of V_REF, which is user programmable.

Fault protection is provided by an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit level is symmetrical and user programmable. Wide supply range allows operation from 4V to 36V at the V_CC input.

	Von Pin	Package
LTC3717	No	SSOP-16
LTC3717-1	Yes	QFN-32

Packaging

5x5 QFN-32

Order Info

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*
LTC3717EGN#PBF	SSOP	16	E	$3.49	$2.95
LTC3717EGN#TRPBF	SSOP	16	E		$3.01
LTC3717EUH-1#PBF	QFN	32	E	$4.73	$3.15
LTC3717EUH-1#TRPBF	QFN	32	E		$3.25
LTC3717EGN	SSOP	16	E	$6.98	$5.90
LTC3717EGN#TR	SSOP	16	E		$6.02
LTC3717EUH-1	QFN	32	E	$9.46	$6.30
LTC3717EUH-1#TR	QFN	32	E		$6.50

^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.