NCP1550_06 ONSEMI [ON Semiconductor], NCP1550_06 Datasheet

NCP1550_06

Manufacturer Part Number

NCP1550_06

Description

600 kHz PWM/PFM Step−Down DC−DC Controller

Manufacturer

ONSEMI [ON Semiconductor]

Datasheet

1.NCP1550_06.pdf (17 pages)

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NCP1550

600 kHz PWM/PFM

Step−Down DC−DC

Controller

mode step−down controller IC, specially designed for battery operated

hand−held electronic products. With appropriate external P−type

MOSFET, the device can provide up to 2.0 A loading current with high

conversion efficiency. The device operates in Constant−Frequency

PWM mode at normal operation, that ensures low output ripple noise,

and which will automatically switch to PFM mode at low output loads

for higher efficiency. Additionally, value−added features of Chip

Enable to reduce IC Off−State current and integrated feedback resistor

network, make it the best choice for portable applications. The device is

designed to operate for voltage regulation with minimum external

components and board space. This device is available in a TSOP−5

package with six standard output voltage options.

Features

•

Typical Applications

•

July, 2006 − Rev. 8

The NCP1550 is a monolithic micropower high frequency voltage

(Typical at PFM Mode with No Load)

with High Accuracy $2.0%

3.3 V/1.8 V

High Efficiency 92%, Typical

Low Quiescent Bias Current of 50 mA

Output Voltage Options from 1.8 V to 3.3 V

Low Output Voltage Ripple, 50 mV, Typical

PWM Switching Frequency at 600 kHz

Automatic PWM/PFM Switchover at Light Load Condition

Very Low Dropout Operation, 100% Max. Duty Cycle

Chip Enable Pin with On−Chip 150 nA Pullup Current Source

Low Shutdown Current, 0.3 mA, Typical

Input Voltage Range from 2.45 V to 5.5 V

Built−in Soft−Start

Internal Undervoltage Lockout (UVLO) Protection

Low Profile and Minimum External Components

Micro Miniature TSOP−5 Package

Pb−Free Packages are Available

Personal Digital Assistant (PDA)

Camcorders and Digital Still Camera

Hand−Held Instrument

Distributed Power System

Computer Peripheral

Conversion from Four NiMH or NiCd or One Lithium−ion Cells to

See detailed ordering and shipping information in the package

dimensions section on page 16 of this data sheet.

(Note: Microdot may be in either location)

GND

ORDERING INFORMATION

xxx = Specific Device Code

OUT

MARKING DIAGRAM

PIN CONNECTIONS

http://onsemi.com

= Assembly Location

= Year

= Work Week

= Pb−Free Package

SN SUFFIX

CASE 483

(Top View)

xxx AYW G

TSOP−5

Publication Order Number:

EXT

NCP1550/D

Related parts for NCP1550_06

NCP1550_06 Summary of contents

Page 1

NCP1550 600 kHz PWM/PFM Step−Down DC−DC Controller The NCP1550 is a monolithic micropower high frequency voltage mode step−down controller IC, specially designed for battery operated hand−held electronic products. With appropriate external P−type MOSFET, the device can provide up to 2.0 ...

Page 2

V OUT 2 GND M1 PIN FUNCTION DESCRIPTIONS Pin Symbol 1 CE Chip Enable pin, active high (internal pullup current source). By connecting this pin to GND, the switching operation of the controller will be stopped. 2 GND Ground ...

Page 3

ELECTRICAL CHARACTERISTICS otherwise noted.) Characteristic TOTAL DEVICE Input Voltage Output Voltage ( mA 25°C) LOAD A NCP1550SN18T1 NCP1550SN19T1 NCP1550SN25T1 NCP1550SN27T1 NCP1550SN30T1 NCP1550SN33T1 Input Current into V Pin OUT NCP1550SN18T1 NCP1550SN19T1 NCP1550SN25T1 NCP1550SN27T1 NCP1550SN30T1 NCP1550SN33T1 Temperature Coefficient ...

Page 4

ELECTRICAL CHARACTERISTICS unless otherwise noted.) Characteristic CE (PIN 1) CE “H” Input Voltage CE “L” Input Voltage CE “H” Input Current ( 5 “L” Input Current ( ...

Page 5

TYPICAL OPERATING CHARACTERISTICS 100 NCP1550SN33T1 3 OUT M = NTGS3441T1 SD = MBRM120LT3 100 I , OUTPUT LOADING CURRENT (mA) ...

Page 6

TYPICAL OPERATING CHARACTERISTICS OUT M = NTGS3441T1 0 MBRM120LT3 1 −0.3 2.7 V −0.6 −0.9 10 100 I , OUTPUT ...

Page 7

L = 3 LOAD Upper Trace: Output Voltage Ripple, 50 mV/Division Middle Trace: Inductor Current 500 mA/Division L Lower Trace: Voltage at Cathode of Schottky Diode, 2.0 ...

Page 8

L = 5 LOAD Upper Trace: Output Voltage Ripple, 50 mV/Division Middle Trace: Inductor Current 500 mA/Division L Lower Trace: Voltage at Cathode of Schottky Diode, 2.0 ...

Page 9

L = 6 LOAD Upper Trace: Output Voltage Ripple, 50 mV/Division Middle Trace: Inductor Current 500 mA/Division L Lower Trace: Voltage at Cathode of Schottky Diode, 2.0 ...

Page 10

3 OUT Upper Trace: Output Voltage Ripple, 100 mV/Division Lower Trace: Input Voltage, 2.0 V/Division Figure 23. Line Transient Response for V = 3.3 V ...

Page 11

5 LOAD = 33 mF) C OUT Upper Trace: Output Voltage Ripple, 100 mV/Division Lower Trace: Load Current 500 mA/Division LOAD Figure 27. ...

Page 12

V IN 3.27 3.25 −50 − AMBIENT TEMPERATURE (°C) A Figure 33. NCP1550SN33T1 Output Voltage versus Ambient Temperature 1.85 1.83 1.81 1. 1.77 1.75 −50 − ...

Page 13

Detailed Operating Description The NCP1550 series are step−down (Buck) DC−DC controllers designed primarily for use in portable applications powered by battery cells. With an appropriate external P−channel MOSFET connected, the device can provide loading current with ...

Page 14

Inductor Value Calculation Selecting the proper inductance is a trade−off between inductor’s physical size, transient respond and power conversion requirements. Lower value inductor saves cost, PC board space and providing faster transient response, but result in higher ripple current and ...

Page 15

PCB Layout Recommendations Good PCB layout plays an important role in switching mode power conversion. Careful PCB layout can help to minimize ground bounce, EMI noise and unwanted feedbacks that can affect the performance of the converter. Suggested hints below ...

Page 16

ORDERING INFORMATION Output Voltage (V Part Number OUT NCP1550SN33T1 3.3 V NCP1550SN33T1G 3.3 V NCP1550SN30T1 3.0 V NCP1550SN30T1G 3.0 V NCP1550SN27T1 2.7 V NCP1550SN27T1G 2.7 V NCP1550SN25T1 2.5 V NCP1550SN25T1G 2.5 V NCP1550SN19T1 1.9 V NCP1550SN19T1G 1.9 V NCP1550SN18T1 1.8 ...

Page 17

NOTE *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and ...

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