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DC432B: LTC1875 and LTC1879 High Efficiency Synchronous Step-Down Regulator Quick Start Guide

Quick start guide for DC432 featuring LTC1875 and LTC1879 synchronous step-down regulators, offering up to 1.5A output current and input voltages up to 10V.

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Overview

Demonstration circuit 432 is a high-efficiency synchronous step-down converter utilizing the LTC1875 or LTC1879 monolithic switching regulators. The LTC1875 version (DC432B) supports an input range of 2.65V to 6V with a 1.5A output current, making it suitable for Li-Ion applications. The LTC1879 version (DC432A) supports up to 10V input with a 1.2A output current. Both devices operate at a nominal 550kHz frequency, which is externally adjustable up to 750kHz. The board provides jumper-selectable output voltages of 1.8V, 2.5V, and 3.3V, alongside a provision for a custom output voltage setting via an optional resistor.

Use Cases

  • PDAs
  • Cellular phones
  • Digital cameras
  • Li-Ion battery-powered applications
  • Low-profile surface mount electronics

Topics

LTC1875
LTC1879
DC432
Step-Down Regulator
Synchronous Converter
Monolithic Switching Regulator
Analog Devices
Linear Technology
Li-Ion Battery Power
LTC1875EGN
LTC1879EGN

Referenced Parts

C4532X5R0J476M

TDK

Cout CAP., X5R, 47uF, 6.3V, 20% 1812 TDK, C4532X5R0J476M

EMK325BJ106MN

Taiyo Yuden

Cin1,Cin2 CAP., X5R, 10uF, 16V, 20% 1210 TAIYO YUDEN, EMK325BJ106MN

CR05-103JM

AAC

Rpl RES.,CHIP, 10K, 1/16W, 5% 0402 AAC, CR05-103JM

CR05-104JM

AAC

Rpg RES.,CHIP, 100K, 1/16W, 5% 0402 AAC, CR05-104JM

CR05-105JM

AAC

Rss RES.,CHIP, 1M, 1/16W, 5% 0402 AAC, CR05-105JM

CR05-10R0FM

AAC

Rin RES.,CHIP, 10, 1/16W, 1% 0402 AAC, CR05-10R0FM

CR05-154JM

AAC

Rc RES.,CHIP, 150K, 1/16W, 5% 0402 AAC, CR05-154JM

CR05-2803FM

AAC

Rfb4 RES.,CHIP, 280K, 1/16W, 1% 0402 AAC, CR05-2803FM

CR05-4123FM

AAC

Rfb3 RES.,CHIP, 412K, 1/16W, 1% 0402 AAC, CR05-4123FM

CR05-6983FM

AAC

Rfb2 RES.,CHIP, 698K, 1/16W, 1% 0402 AAC, CR05-6983FM

CR05-8873FM

AAC

Rfb1 RES.,CHIP, 887K, 1/16W, 1% 0402 AAC, CR05-8873FM

04025A220KAT

AVX

Cffw CAP., NPO, 22pF, 50V, 10% 0402 AVX, 04025A220KAT

04025A470KAT

AVX

Cc1 CAP., NPO, 47pF, 50V, 10% 0402 AVX, 04025A470KAT

04025C221MAT

AVX

Cc2 CAP., X7R, 220pF, 50V, 20% 0402 AVX, 04025C221MAT

04025C222MAT

AVX

Cpl CAP., X7R, 2200pF, 50V, 20% 0402 AVX, 04025C222MAT

0603YC104MAT

AVX

Cbyp,Css CAP., X7R, 0.1uF, 16V, 20% 0603 AVX, 0603YC104MAT

2501-2

Mill-Max

E1-E7 TURRET, MILL-MAX2501-2

2202S-08G1

Comm Con

JP3 JUMPER, DOUBLE ROW 0.079X4 COMM CON2202S-08G1

2802S-03G1

Comm Con

JP1,JP2 JUMPER, 0.079, 3 PIN COMM CON2802S-03G1

CCIJ2MM-138G

Comm Con

JP1,JP2,JP3 SHUNT, COMM CON. CCIJ2MM-138G

LTC1875EGN

Linear Technology

U1 LTC1875EGN LTC1879EGN

LTC1879EGN

Linear Technology

U1 LTC1879EGN, SSOP-16GN LINEAR, LTC1879EGN

A921CY-4R7M

Toko

L1 INDUCTOR,4.7uH, D63LCB TOKO, A921CY-4R7M

MBR0520

ON Semiconductor

D1 MBR0520 (OPT.) DIODE, MBR0520

DC432B: LTC1875 and LTC1879 High Efficiency Synchronous Step-Down Regulator Quick Start Guide | Design Resources