RP506K231B-TR datasheet, PDF - EEWORLD Datasheet

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RP506K231B-TR: DescriptionSwitching Regulator, Current-mode, 2.8A, 2500kHz Switching Freq-Max, CMOS, PDSO10, DFN-10; CategoryPower/power management The power supply circuit; File Size2MB，49 Pages; ManufacturerRICOH Electronic Devices Co., Ltd.; Environmental Compliance

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RP506K231B-TR Overview

Switching Regulator, Current-mode, 2.8A, 2500kHz Switching Freq-Max, CMOS, PDSO10, DFN-10

RP506K231B-TR Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
package instruction	HVSON, SOLCC10,.1,20
Reach Compliance Code	unknown
ECCN code	EAR99
Other features	ALSO REQUIRE FM CONTROL TECHNIQUE
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	5.5 V
Minimum input voltage	2.5 V
Nominal input voltage	3.6 V
JESD-30 code	R-PDSO-N10
length	2.7 mm
Number of functions	1
Number of terminals	10
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	2.8 A
Nominal output voltage	2.3 V
Package body material	PLASTIC/EPOXY
encapsulated code	HVSON
Encapsulate equivalent code	SOLCC10,.1,20
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Certification status	Not Qualified
Maximum seat height	0.6 mm
surface mount	YES
Switch configuration	BUCK
Maximum switching frequency	2500 kHz
technology	CMOS
Temperature level	INDUSTRIAL
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	DUAL
width	2.5 mm

RP506K231B-TR Preview

RP506x Series

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

NO.EA-296-130925

OUTLINE

The RP506x are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous

rectifier featuring 2 A

output current. Internally, a single converter consists of an oscillator, a reference voltage

unit, an error amplifier, a switching control circuit, a mode control circuit, a soft start circuit, a latch type protection

circuit, an under-voltage lockout (UVLO) circuit, a thermal shutdown circuit, and switching transistors.

The RP506x is employing synchronous rectification for improving the efficiency of rectification by replacing

diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance

but also allows a design to reduce parts count.

Power controlling method can be selected from forced PWM control type or PWM/VFM auto switching control

type by inputting a signal to the MODE pin. In low output current, forced PWM control switches at fixed frequency

rate in order to reduce noise. Likewise, in low output current, PWM/VFM auto switching control automatically

switches from PWM mode to VFM mode in order to achieve high efficiency.

Output voltage type can be selected from an internally fixed output voltage type (RP506Kxx1A/B/D/E) or an

externally adjustable output voltage type (RP506K001C/F). The output voltage of the RP506Kxx1A/B/D/E can be

set by 0.1 V step and the output voltage accuracy is as high as ±1.5% or

±18

mV. The output voltage of the

RP506K001C/F can be set by using the external resistors.

Oscillator frequency can be selected from 2.25 MHz (RP506Kxx1A/B/C) or 1.2 MHz (RP506Kxx1D/E/F).

Soft-start time is Typ. 0.15 ms, and by connecting an external capacitor to the T

pin, soft-start time is

adjustable.

Power good (PG) function monitors the V

OUT

pin voltage or the feedback pin voltage (V

), and switches the PG

pin to low if any abnormal condition is detected.

Protection circuits included in the RP506x are over current protection circuit, latch type protection circuit and

thermal shutdown circuit. Over current protection circuit supervises the inductor peak current in each switching

cycle, and if the current exceeds the L

current limit (I

LXLIM

), it turns off Pch Tr. Latch type protection circuit latches

the built-in driver to the OFF state and stops the operation of the step-down DC/DC converter if the over current

status continues or V

OUT

continues being the half of the setting voltage for equal or longer than protection delay

time (tprot). Thermal shutdown circuit detects overheating of the converter if the output pin is shorted to the

ground pin (GND) etc. and stops the converter operation to protect it from damage if the junction temperature

exceeds the specified temperature.

The RP506x is available in DFN(PLP)2527-10 which achieves high-density mounting on boards.

This is an approximate value. The output current is dependent on conditions and external components.

RP506x

NO.EA-296-130925

FEATURES

Supply Current················································ Typ. 48 µA (VFM mode, Lx at no load)

Standby Current·············································· Max. 5 µA

Input Voltage Range ······································· 2.5 V to 5.5 V (Absolute Maximum Ratings: 6.5 V)

Output Voltage Range

Version

RP506Kxx1A/B

RP506K001C

RP506Kxx1D/E

RP506K001F

Forced PWM Control

PWM/VFM Auto Switching Control

1.1 V to 3.3 V

1.1 V to 4.0 V

0.8 V to 3.3 V

0.8 V to 4.0 V

0.6 V to 3.3 V

0.6 V to 4.0 V

Output Voltage Accuracy ································ ±1.5% (V

SET*2

≥

1.2 V),

································ ±18 mV (V

SET

< 1.2 V) (RP506Kxx1A/B/D/E)

Feedback Voltage Accuracy ··························· ±9 mV (V

= 0.6 V) (RP506K001C/F)

Output Voltage/Feedback Voltage

Temperature Coefficient·································· ±100 ppm/ºC

Oscillator Frequency······································· Typ. 2.25 MHz (RP506Kxx1A/B/C)

········································ Typ. 1.2 MHz (RP506Kxx1D/E/F)

Oscillator Maximum Duty································ Min. 100%

Built-in Driver ON Resistance························· Typ. Pch. 0.130

Ω,

Nch. 0.125

Ω

= 3.6 V)

UVLO Detector Threshold ······························ Typ. 2.2 V

Inductor Current Limit Circuit·························· Current limit Typ. 2.8 A

Latch Type Protection Circuit·························· Typ. 1.5 ms

Package·························································· DFN(PLP)2527−10

Refer to

Selection Guide

for detailed information. Fixed output voltage type (RP506Kxx1A/B/D/E) can be set by

0.1 V step.

SET

= Set Output Voltage

APPLICATION

Power source for Li-ion battery-used equipment

Power source for portable communication equipment, camcorder, DSC, Notebook PC

Power source for HDD, WLAN

RP506x

NO.EA-296-130925

BLOCK DIAGRAM

Ramp

Compensation

Current

Feedback

UVLO

Thermal

Protection

Current

Detector

Switching

Control

Soft Start

Vref

(“L” during

Soft Start)

Mode

Control

OSC

PGND

OUT

MODE

Chip

Enable

AGND

Over /Under

Voltage

Detection

OVD

UVD

RP506Kxx1A/D

Ramp

Compensation

Current

Feedback

UVLO

Thermal

Protection

Current

Detector

Switching

Control

Soft Start

Vref

(“L” during

Soft Start)

Mode

Control

OSC

PGND

OUT

MODE

Chip

Enable

AGND

Over /Under

Voltage

Detection

OVD

UVD

RP506Kxx1B/E

RP506x

NO.EA-296-130925

Ramp

Compensation

Current

Feedback

UVLO

Thermal

Protection

Current

Detector

Switching

Control

Soft Start

Vref

(“L” during

Soft Start)

Mode

Control

OSC

PGND

MODE

Chip

Enable

AGND

Over /Under

Voltage

Detection

OVD

UVD

RP506K001C/F

RP506x

NO.EA-296-130925

SELECTION GUIDE

The set output voltage, the output voltage type, the auto-discharge function

, and the oscillator frequency

for the ICs are user-selectable options.

Selection Guide

Product Name

Package

Quantity per Reel

5,000 pcs

Pb Free

Yes

Halogen Free

Yes

RP506Kxx1$(y)-TR DFN(PLP)2527−10

xx: Designation of the set output voltage (V

SET

)

For Fixed Output Voltage Type: 0.6 V (06)

to 3.3 V (33) in 0.1 V steps

For Adjustable Output Voltage Type: 001 only

(y): If V

SET

includes the 3rd digit, indicate the digit of 0.01 V.

(1.25 V)

Ex. If V

SET

is 1.25 V, RP506K121$5-TR-FE.

$: Designation of Version

Version

RP506Kxx1A

RP506Kxx1B

RP506K001C

RP506Kxx1D

RP506Kxx1E

RP506K001F

Output Voltage Auto-discharge

Function

Type

Fixed

Adjustable

Fixed

Adjustable

Yes

SET

Oscillator

PWM/VFM

Frequency Forced PWM

Auto Switching

2.25 MHz

1.1 V to 3.3 V

1.1 V to 4.0 V

1.2 MHz

0.8 V to 3.3 V

0.8 V to 4.0 V

0.6 V to 3.3 V

0.6 V to 4.0 V

Auto-discharge function quickly lowers the output voltage to 0 V, when the chip enable signal is switched from the

active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.

SET

can be set only within the specified range of voltage. Refer to

Designation of Version

for detailed information.

0.05 V step is also available as a custom code.

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