LTC3545/LTC3545-1 - Triple 800mA Synchronous Step-Down Regulator - 2.25MHz
Datasheet Documentation
Datasheet
Reliability Data
Press Release
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Overview

Features

Typical Application

LTC3545 Typical Application
LTC3545 Typical Application

Description

The LTC3545/LTC3545-1 are triple, high efficiency, monolithic synchronous buck regulators using a constant frequency, current mode architecture. The regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the LTC3545/LTC3545-1 well suited for single Li-Ion battery-powered applications. Low ripple pulse skip mode or high efficiency Burst Mode operation is externally selectable. PWM pulse skip mode operation provides very low output ripple voltage while Burst Mode operation increases efficiency at low output loads.

Switching frequency is internally set to 2.25MHz, or the switching frequency can be synchronized to an external 1MHz to 3MHz clock. Power good indicators easily allow power on sequencing between the three regulators.

The internal synchronous switches increase efficiency and eliminate external Schottky diodes. Low output voltages are supported with the 0.6V feedback reference voltage.

The LTC3545-1 replaces the SYNC/MODE function with a third PGOOD pin and forces Burst Mode operation.
Packaging

3x3 QFN-16

LTC3545 Package Drawing
LTC3545 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
(1-99)		 Price
(1k)*
LTC3545EUD#PBF QFN 16 E $4.43 $3.10
LTC3545EUD#TRPBF QFN 16 E $3.16
LTC3545EUD-1#PBF QFN 16 E $4.43 $3.10
LTC3545EUD-1#TRPBF QFN 16 E $3.16
LTC3545IUD#PBF QFN 16 I $5.10 $3.57
LTC3545IUD#TRPBF QFN 16 I $3.63
LTC3545IUD-1#PBF QFN 16 I $5.10 $3.57
LTC3545IUD-1#TRPBF QFN 16 I $3.63
* 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.


Part Number Description Price Documentation
DC1193A-A LTC3545EUD Demo Board | 2.25V to 5.5VIN, 1.2V@0.8A, 1.5V@0.8A, 1.8V@0.8A; SYNC Pin $150.00
DC1193A-B LTC3545EUD Demo Board | 2.25V to 5.5VIN, 1.2V@0.8A, 1.5V@0.8A, 1.8V@0.8A; PGOOD Pin, Burst Mode Only $150.00