R1218N062A-TR-FE [RICOH]

Switching Regulator, 1A, 1400kHz Switching Freq-Max, PDSO6, HALOGEN FREE AND ROHS COMPLIANT, SOT-23, 6 PIN;


型号：	R1218N062A-TR-FE
厂家：	RICOH ELECTRONICS DEVICES DIVISION
描述：	Switching Regulator, 1A, 1400kHz Switching Freq-Max, PDSO6, HALOGEN FREE AND ROHS COMPLIANT, SOT-23, 6 PIN 光电二极管
文件：	总2页 (文件大小：211K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

R1218x Series

PWM Step-up DC/DC Converter for White LED

The R1218x Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs with constant current.

R1218x includes an under-voltage lockout circuit (UVLO), over-voltage protection circuit (OVP). By simply using an inductor, (a

diode), a resistor, and a capacitor as external components, white LEDs can be driven with constant current efficiency. R1218xxx1A for

2 to 4 lights contains an internal diode while R1218xxx2A for 5 to 7 lights requires an external diode. The LED current can be

determined by the value of current setting resistor. The brightness of the LEDs can be adjusted by applying a PWM signal to the CE

or V^FBpin.

FEATURES

• Supply Current (IDD)························Typ. 500μA (No switching)

• Standby Current (Istandby) ·················Max. 3μA (CE="L")

• Input Voltage Range (VIN)···············1.8V to 5.5V

(Absolute maximum rating : 6.5V)

• Oscillator Frequency (fosc) ······················ 1.2MHz

Oscillator Maximum Duty Cycle (Maxduty) Min. 86%,

Typ. 91%, 92% (072A only)

• UVLO Detect Voltage (VUVLO)················· Typ. 1.6V

Coil-current Limit Circuit··························· Current limit Typ. 700mA

• Over Voltage Protection Circuit (OVP)

• Packages ··············································· DFN(PLP)1820-6, SOT-23-6

•

• Feedback Voltage (VFB

)

··················0.2V

•

• Feedback Voltage Accuracy ···········± 10mV

•

Temp. coeff. of Feedback Voltage·····± 150ppm/°C

BLOCK DIAGRAM

TYPICAL APPLICATIONS

R1218x041A

R1218x072A

R1218x

VFB

VIN

VOUT

22μH

1μF

Error Amp

UVLO

PWM Comp.

0.22μF

Switch

Control

VIN

OVP

1μF

0.22μF

Vref

VIN

OSC

VOUT

Slope

Compensation

Current

Protect

Current

sense

VOUT

GND

VFB

10Ω

Shutdown

delay

Chip Enable

GND

VFB

10Ω

GND

SELECTION GUIDES

: Specify the OVP Voltage.

Halogen Free

Package

Q'ty per Reel

Part No.

(

) 9.5V,

) 23.0V, (

(

) 14.0V, (

) 27.5V, (

) 18.5V,

) 31.5V

DFN(PLP)1820-6 5,000 pcs R1218K

SOT-23-6

xx$$-TR

3,000 pcs R1218N

xx$$-TR-FE

: Specifies built-in diode.

) with diode, (

) without diode,

xx$$

: 021A, 031A, 041A, 052A, 062A, 072A

(Other combinations are not available.)

Combination

PACKAGES (Top View)

TYPICAL CHARACTERISTIC

R1218x041A Efficiency vs. Output Current

DFN(PLP)1820-6

SOT-23-6

Topt=25°C, VIN=4.2V

100

∗

VFB

GND

VIN

VOUT

VIN

GND

VFB

VOUT

Output Current l^OUT(mA)

∗) The tab is substrate level (GND).

APPLICATION

• White LED driver for hand-held equipment

No.EK-166-121001

Step-up 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.

For the conservation of the global environment, Ricoh is advancing the decrease of the negative environmental impact material.

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.

Basically after Apr. 1, 2012, we will ship out the Power Management ICs of the Halogen Free products only. (Ricoh Halogen Free products are

also Antimony Free.)

Halogen Free

RICOH COMPANY, LTD.

Electronic Devices Company

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

RICOH COMPANY, LTD.

Electronic Devices Company

● Higashi-Shinagawa Oﬃce (International Sales)

3-32-3, Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-8655, Japan

Phone: +81-3-5479-2857 Fax: +81-3-5479-0502

RICOH EUROPE (NETHERLANDS) B.V.

● Semiconductor Support Centre

“Nieuw Kronenburg”Prof. W.H. Keesomlaan 1, 1183 DJ, Amstelveen, The Netherlands

P.O.Box 114, 1180 AC Amstelveen

Phone: +31-20-5474-309 Fax: +31-20-5474-791

RICOH ELECTRONIC DEVICES KOREA Co., Ltd.

11 ﬂoor, Haesung 1 building, 942, Daechidong, Gangnamgu, Seoul, Korea

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

RICOH ELECTRONIC DEVICES SHANGHAI Co., Ltd.

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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