R1242S001H-E2-F [RICOH]

Switching Regulator, Current-mode, 4.5A, 1100kHz Switching Freq-Max, CMOS, PDSO8, HALOGEN FREE, HS0P-8;


型号：	R1242S001H-E2-F
厂家：	RICOH ELECTRONICS DEVICES DIVISION
描述：	Switching Regulator, Current-mode, 4.5A, 1100kHz Switching Freq-Max, CMOS, PDSO8, HALOGEN FREE, HS0P-8 开关光电二极管
文件：	总2页 (文件大小：191K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

R1242S Series

3A^∗30V Input PWM Step-down DC/DC Converter

The R1242S Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 3A^∗output current. R1242S includes a

soft start circuit and a latch or fold-back protection circuit. By simply using an inductor, resistors, a low side switch (FET), and

capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode

PWM control, the R1242S provides a fast response and high efficiency. Ceramic output capacitors can be used.

FEATURES

• Supply Current (IDD)························Typ. 0.8mA (VIN=30V, SET VFB=1.0V)

• Standby Current (Istandby) ·················Max. 20μA (VIN=30V, CE="L")

• Input Voltage Range (VIN)···············5V to 30V

• Output Voltage Range (VOUT)··········0.8V to 15V (externally adjustable)

(Feedback voltage 0.8V)

• Soft Start Time (tstart)························Typ. 0.5ms

• High Side Switch Limit Current·······Typ. 4.5A

• Thermal Shutdown Circuit ··············Stops at 160°C

• Latch Protection Circuit···················Delay time for protection

Typ. 5ms (A/C/E/G Version)

• Feedback Voltage Accuracy ···········± 12mV

• Fold-back Protection Circuit············Fold-back frequency

• Output Current (IOUT)·······················3A^∗

f^osc× 1/4 (B Version),

• Oscillator Frequency (fosc)···············Select from 330kHz to 1MHz with an external

83kHz (D Version),

125kHz (F Version),

resistor (A/B Version),

330kHz (C/D), 500kHz (E/F), or 1MHz (G/H)

250kHz (H Version)

•

Oscillator Maximum Duty Cycle (Maxduty) ···Typ. 88%

• UVLO Detect Voltage (VUVLO) ·········Typ. 3.6V

• Package··········································HSOP-8E

) This is an approximate value, because output current depending on conditions and external parts.

∗

BLOCK DIAGRAM

TYPICAL APPLICATION

R1242S001A/B

R1242S001A

Thermal Shutdown

BST

50kΩ

0.1μF

BST

100pF

SPD

CIN

10μF

UVLO

Regulator

OUT=3.3V

BST

Shutdown

L4.7μH

SETPULSE

COUT

OSC

10μF

16kΩ

EXT

MAXDUTY

Vref

GND

"H"active

(Recommendation)

at short 1000kHz

GND

5.1kΩ

0.2V

Soft Start

0.8V

Current Slope

Limit Latch

EXT

CSPD: Speed-up capacitor

C^IN, COUT: Ceramic capacitors can be used.

C^BST: Bootstrap Capacitor

Peak Current Limit

Shutdown

R1, R2: Resistors for setting output voltage

GND

SELECTION GUIDE

: 330kHz, Latch type

: 330kHz, Fold-back type

: 500kHz, Latch type

Package

Quantity per Reel

Part No.

HSOP-8E

1,000 pcs

R1242S001

∗ -E2-F

F.. : 500kHz, Fold-back type

∗

Specify a combination of the oscillator frequency and the protection circuit.

: Oscillator Frequency adjustable, Latch type

: Oscillator Frequency adjustable, Fold-back type

: 1MHz, Latch type

: 1MHz, Fold-back type

PACKAGE

TYPICAL CHARACTERISTIC

R1242S

HSOP-8E

V^OUT=3.3V, fosc=500kHz

Top View

7 6

Bottom View

5 6 7 8

(Synchronous rectification)

100

EXT

BST

VIN

∗

V^IN=5V

VIN=9V

GND

VFB

RT or TEST^∗

VIN=12V

VIN=24V

VIN=30V

) The tab is substrate level (GND).

2) The TEST pin connected to the GND level or

should be open.

∗

100

1000

10000

Output Current I^OUT(mA)

APPLICATIONS

• Power source for digital home appliances such as digital TVs and DVD players

• Power source for hand-held communication equipment, cameras, and VCRs

• Power source for office automation equipment such as printers and fax machines

• Power source for battery-powered equipment

No.EK-191-091101

Step-down DC/DC Converter

1.The products and the product speciﬁcations described in this document are subject to change or

discontinuation of production without notice for reasons such as improvement. Therefore, before

deciding to use the products, please refer to Ricoh sales representatives for the latest

information thereon.

2.The materials in this document may not be copied or otherwise reproduced in whole or in part

without prior written consent of Ricoh.

3.Please be sure to take any necessary formalities under relevant laws or regulations before

exporting or otherwise taking out of your country the products or the technical information

described herein.

4.The technical information described in this document shows typical characteristics of and

example application circuits for the products. The release of such information is not to be

construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual

property rights or any other rights.

5.The products listed in this document are intended and designed for use as general electronic

components in standard applications (oﬃce equipment, telecommunication equipment,

measuring instruments, consumer electronic products, amusement equipment etc.). Those

customers intending to use a product in an application requiring extreme quality and reliability,

for example, in a highly speciﬁc application where the failure or misoperation of the product

could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system,

traﬃc control system, automotive and transportation equipment, combustion equipment, safety

devices, life support system etc.) should ﬁrst contact us.

6.We are making our continuous eﬀort to improve the quality and reliability of our products, but

semiconductor products are likely to fail with certain probability. In order to prevent any injury to

persons or damages to property resulting from such failure, customers should be careful enough

to incorporate safety measures in their design, such as redundancy feature, ﬁrecontainment

feature and fail-safe feature. We do not assume any liability or responsibility for any loss or

damage arising from misuse or inappropriate use of the products.

7.Anti-radiation design is not implemented in the products described in this document.

8.Please contact Ricoh sales representatives should you have any questions or comments

concerning the products or the technical information.

RICOH COMPANY., LTD. Electronic Devices Company

■Ricoh awarded ISO 14001 certification.

■

Ricoh presented with the Japan Management Quality Award for 1999.

The Ricoh Group was awarded ISO 14001 certification, which is an international standard for

environmental management systems, at both its domestic and overseas production facilities.

Our current aim is to obtain ISO 14001 certification for all of our business offices.

Ricoh continually strives to promote customer satisfaction, and shares the achievements

of its management quality improvement program with people and society.

Ricoh completed the organization of the Lead-free production for all of our products.

After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that

will be shipped from now on comply with RoHS Directive.

http://www.ricoh.com/LSI/

RICOH COMPANY, LTD.

Electronic Devices Company

● Shin-Yokohama oﬃce (International Sales)

3-2-3, Shin-Yokohama, Kohoku-ku, Yokohama City, Kanagawa 222-8530, Japan

Phone: +81-45-477-1697 Fax: +81-45-477-1698

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Phone: +82-2-2135-5700 Fax: +82-2-2135-5705

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Room403, No.2 Building, 690#Bi Bo Road, Pu Dong New district, Shanghai 201203,

People's Republic of China

Phone: +86-21-5027-3200 Fax: +86-21-5027-3299

RICOH COMPANY, LTD.

Electronic Devices Company

● Taipei oﬃce

Room109, 10F-1, No.51, Hengyang Rd., Taipei City, Taiwan (R.O.C.)

Phone: +886-2-2313-1621/1622 Fax: +886-2-2313-1623

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