RP505K141B-TR datasheet, PDF - EEWORLD Datasheet

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RP505K141B-TR: DescriptionSwitching Controller, 2500kHz Switching Freq-Max, CMOS, PDSO8, 2 X 2 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-8; CategoryPower/power management The power supply circuit; File Size347KB，2 Pages; ManufacturerRICOH Electronic Devices Co., Ltd.; Environmental Compliance

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RP505K141B-TR Overview

Switching Controller, 2500kHz Switching Freq-Max, CMOS, PDSO8, 2 X 2 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-8

RP505K141B-TR Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Maker	RICOH Electronic Devices Co., Ltd.
Parts packaging code	DFN
package instruction	HVSON,
Contacts	8
Reach Compliance Code	unknown
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	5.5 V
Minimum input voltage	2.3 V
Nominal input voltage	3.6 V
JESD-30 code	S-PDSO-N8
JESD-609 code	e4
length	2 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Nominal output voltage	1.4 V
Package body material	PLASTIC/EPOXY
encapsulated code	HVSON
Package shape	SQUARE
Package form	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	0.6 mm
surface mount	YES
Switch configuration	BOOST
Maximum switching frequency	2500 kHz
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Gold (Au)
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	2 mm

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RP505K Series

∗

PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

The RP505K Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP505K can be

selected from two control types by input signal to the MODE pin - forced PWM control or PWM/VFM auto switching control in which mode

automatically switches to high-efficiency VFM mode in low output current. The xx1A/B version with an internally fixed output voltage type

and the 001C version with an externally adjustable output voltage type are available. RP505K includes a soft start circuit, an under-voltage

lockout circuit (UVLO), thermal shutdown circuit and a latch protection circuit. By simply using an inductor, (resistors) and capacitors as

external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2μH) and output

capacitor (10μF) can be used by the switching of 2.25MHz. A 2mm square compact DFN(PLP)2020-8 package is available.

FEATURES

•

Supply Current (I

DD1

)·················· Typ. 500μA (Switching)

•

Supply Current (I

DD2

)·················· Typ. 40μA (No switching, VFM)

•

Supply Current (I

DD2

)·················· Typ. 500μA (No switching, PWM)

•

Standby Current (I

standby

) ············ Max. 5μA (CE="L")

•

Input Voltage Range (V

) ·········· 2.3V to 5.5V (V

SET

≥

0.8V)

•

Output Voltage Range (V

OUT

)····· 0.6V to 3.3V

∗∗

(Internally fixed, RP505Kxx1A/B)

•

Oscillator Maximum Duty Cycle (Maxduty)···· Min. 100%

•

UVLO Detect Voltage (V

UVLO

) ·············· Typ. 2.0V

•

Soft Start Time (t

start

) ···························· Typ. 0.15ms

•

Thermal Shutdown Circuit ··················· Stops at 140°C.

•

Coil-current Limit Circuit ···················· Current limit Typ. 1.7A

•

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

•

Auto-discharge Function······················ B Version

•

MODE Pin ·········································· "H": forced PWM control,

•

Package··············································· DFN(PLP)2020-8

Typ. 1.5ms

"L": PWM/VFM auto switching control

0.8V to 3.3V (Externally djustable, RP505K001C)

(Feedback Voltage : 0.6V)

Output Voltage Accuracy ···········

1.5% (Feedback Voltage Accuracy :

9mV)

Output Current (I

OUT

)·················· 1A

∗

Oscillator Frequency (f

osc

)·········· 2.25MHz

∗)

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

∗∗)

For less than 0.8V, the input voltage range is limited. For details, please refer to the datasheet.

BLOCK DIAGRAMS

RP505Kxx1A/B

(Internally fixed output voltage type)

Ramp

Compensation

Current

Feedback

Ramp

Compensation

Current

Feedback

RP505K001C

(Externally adjustable output voltage type)

UVLO

Thermal

Shutdown

Current

Detector

Switching

Control

UVLO

Thermal

Shutdown

Current

Detector

Switching

Control

Soft Start

Vref

Soft Start

Vref

MODE

Chip

Enable

Mode

Control

OSC

PGND

MODE

Chip

Enable

Mode

Control

OSC

PGND

OUT

AGND

SELECTION GUIDES

Halogen Free

Part No.

RP505K.xx.1.

∗

-TR

DFN(PLP)2020-8 5,000 pcs

RP505K.00.1.$.-TR

Package

Q'ty per Reel

TYPICAL APPLICATIONS

RP505Kxx1A/B

2.2μH

OUT

10μF

4.7μF

OUT

RP505K001C

2.2μH

OUT

10μF

OUT

.xx.

: Specify the output voltage within the range of

0.6V (.06.) to 3.3V (.33.) in 0.1V steps.

(For externally adjustable output voltage type (.00.))

.∗

: Select from (.A.) internally fixed output voltage type,

without auto-discharge function or

(.B.) internally fixed output voltage type, with auto-discharge function.

.$.

: (.C.) externally adjustable output voltage type,

without auto-discharge function

4.7μF

OUT

MODE

AGND

MODE

AGND

PGND

L : MIPSA2520D2R2 (FDK)

: C1608JB0J475K (TDK)

OUT

: C1608JB0J106M (TDK)

Set Output Voltage

0.6V

≤

SET

< 1.6V

1.6V

≤

SET

≤

2.3V

2.3V < V

SET

≤

3.3V

Inductor

1.0μH or more

1.5μH or more

2.2μH or more

PACKAGE

DFN(PLP)2020-8

Top View

TYPICAL CHARACTERISTIC

RP505K331x

∗

Efficiency vs. Output Current

Bottom View

MODE

∗∗

PGND

∗∗

AGND

∗∗

OUT

or V

∗

) The tab is substrate level (GND).

∗∗

) No.3 pin and No.4 pin, No.6 pin and No.7 pin must be wired together when it is mounted on board.

100

Efficiency

(%)

=4.3V, PWM/VFM

=5.0V, PWM/VFM

=4.3V, forced PWM

=5.0V, forced PWM

APPLICATIONS

•

Power source for battery-powered equipment

•

Power source for Wireless LAN terminals

No.EK-273-121001

100

Output Current I

OUT

(mA)

1000

•

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

Step-down DC/DC Converter

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