NCP1421LEDEVB ON Semiconductor, NCP1421LEDEVB Datasheet

NCP1421LEDEVB

Manufacturer Part Number

NCP1421LEDEVB

Description

EVAL BOARD FOR NCP1421LED

Manufacturer

ON Semiconductor

Datasheets

1.NCP1421DMR2G.pdf (14 pages)

2.NCP1421LEDEVB.pdf (6 pages)

Specifications of NCP1421LEDEVB

Design Resources

NCP1421LEDEVB BOM NCP1421LEDEVB Schematic NCP1421LEDEVB Gerber Files

Current - Output / Channel

600mA

Outputs And Type

1, Non-Isolated

Voltage - Output

500 ~ 700 mV

Voltage - Input

3.6V

Utilized Ic / Part

NCP1421

Core Chip

NCP1421

Topology

Boost

No. Of Outputs

Output Current

600mA

Development Tool Type

Hardware - Eval/Demo Board

Mcu Supported Families

NCP1421

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Features

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

For Use With/related Products

NCP1421LED

Other names

NCP1421LEDEVBOS

Current page: 1 of 14
Download datasheet (117Kb)

NCP1421

600 mA Sync−Rect PFM

Step−Up DC−DC Converter

with True−Cutoff and

Ring−Killer

switching converter IC specially designed for battery−operated

hand−held electronic products up to 600 mA loading. It integrates

Sync−Rect to improve efficiency and to eliminate the external

Schottky Diode. High switching frequency (up to 1.2 MHz) allows

for a low profile, small−sized inductor and output capacitor to be

used. When the device is disabled, the internal conduction path from

LX or BAT to OUT is fully blocked and the OUT pin is isolated from

the battery. This True−Cutoff function reduces the shutdown current

to typically only 50 nA. Ring−Killer is also integrated to eliminate

the high−frequency ringing in discontinuous conduction mode. In

addition to the above, Low−Battery Detector, Logic−Controlled

Shutdown, Cycle−by−Cycle Current Limit and Thermal Shutdown

provide value−added features for various battery−operated

applications. With all these functions on, the quiescent supply

current is typically only 8.5 mA. This device is available in the

compact and low profile Micro8t package.

Features

Typical Applications

October, 2004 − Rev. 6

NCP1421 is a monolithic micropower high−frequency step−up

typically 50 nA

2.5 mA Loading Current when V

3.0−5.0 V or one Lithium−ion cells to 5.0 V

Pb−Free Package is Available

High Efficiency: 94% for 3.3 V Output at 200 mA from 2.5 V Input

High Switching Frequency, up to 1.2 MHz (not hitting current limit)

Output Current up to 600 mA at V

True−Cutoff Function Reduces Device Shutdown Current to

Anti−Ringing Ring−Killer for Discontinuous Conduction Mode

High Accuracy Reference Output, 1.20 V $1.5%, can Supply

Low Quiescent Current of 8.5 mA

Integrated Low−Battery Detector

Open Drain Low−Battery Detector Output

1.0 V Startup at No Load Guaranteed

Output Voltage from 1.5 V to 5.0 V Adjustable

1.5 A Cycle−by−Cycle Current Limit

Multi−function Logic−Controlled Shutdown Pin

On Chip Thermal Shutdown with Hysteresis

Personal Digital Assistants (PDA)

Handheld Digital Audio Products

Camcorders and Digital Still Cameras

Hand−held Instruments

Conversion from one to two Alkaline, NiMH, NiCd Battery Cells to

White LED Flash for Digital Cameras

Semiconductor Components Industries, LLC, 2004

88% for 3.3 V Output at 500 mA from 2.5 V Input

OUT

= 2.5 V and V

> 3.3 V

OUT

= 3.3 V

†For information on tape and reel specifications,

NCP1421DMR2

NCP1421DMR2G

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

Device

LBI/EN

LBO

REF

ORDERING INFORMATION

1421

PIN CONNECTIONS

http://onsemi.com

CASE 846A

DM SUFFIX

(Pb−Free)

(Top View)

Package

= Device Code

= Assembly Location

= Year

= Work Week

Micro8

Publication Order Number:

4000 Tape & Reel

Shipping†

MARKING

DIAGRAM

OUT

GND

BAT

NCP1421/D

1421

AYW

Related parts for NCP1421LEDEVB

NCP1421LEDEVB Summary of contents

Page 1

NCP1421 600 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer NCP1421 is a monolithic micropower high−frequency step−up switching converter IC specially designed for battery−operated hand−held electronic products up to 600 mA loading. It integrates Sync−Rect to improve efficiency ...

Page 2

V Chip Enable − PFM REF Voltage Reference 4 1. LBI/EN − 2 NCP1421 ZLC + − TRUE CUTOFF CONTROL CONTROL LOGIC _ZCUR _TSDON V DD _MSON _MAINSW2ON GND _CEN _PFM ...

Page 3

PIN FUNCTION DESCRIPTIONS Pin Symbol 1 FB Output Voltage Feedback Input. 2 LBI/EN Low−Battery Detector Input and IC Enable. With this pin pulled down below 0.5 V, the device is disabled and enters the shutdown mode. 3 LBO Open−Drain Low−Battery ...

Page 4

ELECTRICAL CHARACTERISTICS otherwise noted.) Characteristic Operating Voltage Output Voltage Range Reference Voltage = 200 nF, T OUT LOAD REF Reference Voltage = ...

Page 5

TYPICAL OPERATING CHARACTERISTICS 1.220 V = 3.3 V OUT 1.210 = OUT = 1 REF T = 25_C A 1.200 1.190 1.180 1 10 ...

Page 6

TYPICAL OPERATING CHARACTERISTICS 100 100 OUTPUT LOADING CURRENT, I Figure 8. Efficiency vs. Load Current 100 100 OUTPUT LOADING CURRENT, I Figure 10. Efficiency vs. Load ...

Page 7

TYPICAL OPERATING CHARACTERISTICS 3.3 V OUT L = 5.6 mH − OUT T = 25_C A −10 10 100 OUTPUT LOADING CURRENT, I Figure 14. Output ...

Page 8

TYPICAL OPERATING CHARACTERISTICS = 50 mA 5 OUT LOAD Upper Trace: Output Voltage Ripple, 20 mV/Division Lower Trace: Voltage at Lx pin, 1.0 V/Division Figure 20. ...

Page 9

NCP1421 is a monolithic micropower high−frequency step−up voltage switching converter IC specially designed for battery operated hand−held electronic products up to 600 mA loading. It integrates a Synchronous Rectifier to improve efficiency as well as to eliminate the external Schottky ...

Page 10

If the pin 2 voltage is raised to higher than 0.5 V (for example resistor connected the IC ...

Page 11

200 k Shutdown Open Drain Input Low Battery Open Drain Output *Optional Figure 26. Typical Application Schematic for 2 Alkaline Cells Supply Switching mode converter design is considered a complicated process. Selecting the right ...

Page 12

From the previous calculations, you need at least 18. order to achieve the specified ripple level at the conditions stated. Practically, a capacitor that is one level larger is used to accommodate factors not taken into account in ...

Page 13

... Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. NCP1421 PACKAGE DIMENSIONS Micro8 DM SUFFIX CASE 846A−02 ISSUE F NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14 ...

Page 14

... Fax: 480−829−7709 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com NCP1421 N. American Technical Support: 800−282−9855 Toll Free USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Phone: 81−3−5773−3850 http://onsemi.com 14 ON Semiconductor Website: http://onsemi ...

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