LTC1159 - High Efficiency Synchronous Step-Down Switching Regulators
Datasheet Documentation
Datasheet
Reliability Data
cad_symbol
Overview

Features

Typical Application

LTC1159 Typical Application
LTC1159 Typical Application

Description

The LTC®1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst ModeTM operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.

A separate pin and on-board switch allow the MOSFET driver power to be derived from the regulated output voltage providing significant efficiency improvement when operating at high input voltages. The constant off-time current-mode architecture maintains constant ripple current in the inductor and provides excellent line and load transient response. The output current level is user programmable via an external current sense resistor.

The LTC1159 automatically switches to power saving Burst Mode operation when load current drops below approximately 15% of maximum current. Standby current is only 300µA while still regulating the output and shutdown current is a low 20µA.

Packaging

SO-16,SSOP-20

LTC1159 Package Drawing
LTC1159 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
(1-99)		 Price
(1k)*
LTC1159CG#PBF SSOP 20 C $6.65 $5.35
LTC1159CG#TRPBF SSOP 20 C $5.45
LTC1159CG-3.3#PBF SSOP 20 C $6.65 $5.35
LTC1159CG-3.3#TRPBF SSOP 20 C $5.45
LTC1159CG-5#PBF SSOP 20 C $6.65 $5.35
LTC1159CG-5#TRPBF SSOP 20 C $5.45
LTC1159CS#PBF SO 16 C $6.00 $4.80
LTC1159CS#TRPBF SO 16 C $4.86
LTC1159CS-3.3#PBF SO 16 C $6.00 $4.80
LTC1159CS-3.3#TRPBF SO 16 C $4.86
LTC1159CS-5#PBF SO 16 C $6.00 $4.80
LTC1159CS-5#TRPBF SO 16 C $4.86
LTC1159IS#PBF SO 16 I $6.80 $5.75
LTC1159IS#TRPBF SO 16 I $5.81
LTC1159IS-3.3#PBF SO 16 I $6.80 $5.75
LTC1159IS-3.3#TRPBF SO 16 I $5.81
LTC1159IS-5#PBF SO 16 I $6.80 $5.75
LTC1159IS-5#TRPBF SO 16 I $5.81
LTC1159CG SSOP 20 C $13.30 $10.70
LTC1159CG#TR SSOP 20 C $10.90
LTC1159CG-3.3 SSOP 20 C $13.30 $10.70
LTC1159CG-3.3#TR SSOP 20 C $10.90
LTC1159CG-5 SSOP 20 C $13.30 $10.70
LTC1159CG-5#TR SSOP 20 C $10.90
LTC1159CS SO 16 C $12.00 $9.60
LTC1159CS#TR SO 16 C $9.72
LTC1159CS-3.3 SO 16 C $12.00 $9.60
LTC1159CS-3.3#TR SO 16 C $9.72
LTC1159CS-5 SO 16 C $12.00 $9.60
LTC1159CS-5#TR SO 16 C $9.72
LTC1159IS SO 16 I $13.60 $11.50
LTC1159IS#TR SO 16 I $11.62
LTC1159IS-3.3 SO 16 I $13.60 $11.50
LTC1159IS-3.3#TR SO 16 I $11.62
LTC1159IS-5 SO 16 I $13.60 $11.50
LTC1159IS-5#TR SO 16 I $11.62
* 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
DC057A-A LTC1159CS | HIGH EFFICIENCY SYNCHRONOUS SWITCHER (3.3V ADJ.@1A) Contact Factory
DC057A-B LTC1159CS | High Efficiency Synchronous Switcher (3.3V @ 2.5) Contact Factory
DC057A-C LTC1159CS-5 | High Efficiency Synchronous Switcher (5V @ 2A) Contact Factory