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RP509 Series
0.5A/1A 6MHz PWM/VFM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

The RP509 is a low supply current CMOS-based PWM/VFM step-down DC/DC converter with synchronous rectifier featuring 0.5A / 1A output current.
Output voltage controlling method is selectable between a forced PWM control type and a PWM/VFM auto-switching control type, and can be set by the MODE pin.

Internally, a single converter consists of a reference voltage unit, an error amplifier, a switching control circuit, a mode control circuit, a soft-start circuit, an under-voltage lockout (UVLO) circuit, a thermal shutdown circuit, and switching transistors.
Furthermore, RP509 is current limit circuit and thermal shutdown circuit. Lx current limit value (Typ.) is selectable between 1.6 A and 1.0 A.

The RP509Z is available in WLCSP−6−P6 which achieves high-density mounting on boards. A high frequency of 6 MHz enables to use capacitor of 0402- / 1005-size (inch / mm) and inductor of 0603- /1608-size (inch / mm) as external parts help to save space for devices.
The RP509N is available in SOT-23-6.

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 5.5 V (6.5V)
Standby Current Typ. 0 µA
Output Voltage Range Fixed Output Voltage Type 0.6 V to 3.3 V - Settable in 0.1 V Step
Adjustable Output Voltage Type 0.6 V to 5.5 V
Output Voltage Accuracy Fixed Output Voltage Type ±1.5% (VSET*1 ≥ 1.2V), ±18 mV (VSET < 1.2V)
Feedback Voltage Accuracy Adjustable Output Voltage Type ±9 mV (VFB = 0.6V)
Output Voltage/Feedback Voltage Temperature Coefficient ±100 ppm/°C
Selectable Oscillator Frequency Typ. 6.0 MHz
Oscillator Maximum Duty Min. 100%
Built-in Driver ON Resistance (VIN = 3.6 V) Typ. Pch. 0.175 Ω, Nch. 0.155 Ω (RP509Z)
Typ. Pch. 0.195 Ω, Nch. 0.175 Ω (RP509N)
UVLO Detector Threshold Typ. 2.0 V
Soft-start Time Typ. 0.15 ms
Inductor Current Limit Circuit Typ. 1.6 A / 1.0 A - Selectable Current Limit
Packages WLCSP−6−P6 (1.28 mm x 0.88 mm), SOT-23-6

*) VSET = Set Output Voltage

APPLICATION INFORMATION

Fixed Output Voltage Type

CIN: 4.7 µF
COUT: 10 µF
L: 0.47 µH

Adjustable Output Voltage Type

CIN: 4.7 µF
COUT: 10 µF
L: 0.47 µH

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current VOUT=1.8V
VMODE = "L" PWM/VFM Auto Switching

Efficiency vs. Output Current VOUT=3.3V Fixed
VMODE = "L" PWM/VFM Auto Switching

PIN DESCRIPTION

WLCSP-6-P6

WLCSP-6-P61.28 mm × 0.88 mm × 0.64 mm
A1 MODE
B1 Lx
C1 VOUT/VFB
A2 VIN
B2 CE
C2 GND

*) The tab is substrate level (GND).

SOT-23-6

SOT-23-62.9 mm × 2.8 mm
1 CE
2 GND
3 VIN
4 MODE
5 Lx
6 VOUT/VFB

RP509 Series for Consumer

APPLICATIONS

  • Power source for Portable communication equipment such as mobile/smart phone, digital camera, and Note-PC
  • Power source for Li-ion battery-used equipment

PRODUCT LONGEVITY PROGRAM

RP509 series operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

The set output voltage, the output voltage type, the auto-discharge function, and the Lx current limit for the ICs are user-selectable options.

Product Name   Package Quantity per Reel
RP509ZxxX$-E2-F ConsumterPLP WLCSP−6−P6 5,000
RP509NxxX$-TR-FE ConsumterPLP SOT-23-6 3,000
  • xx … Specify the set output voltage (VSET)
    Fixed Output Voltage Type: 06 to 33 (0.6 V to 3.3 V, 0.1 V steps)
    The voltage in 0.05 V step is shown as follows.
    1.05 V: RP509Z101B5
    1.15 V: RP509N111B5
    Adjustable Output Voltage Type: 00 only
  • X … Designation of Lx Current Limit
    1: Typ. 1.6 A
    2: Typ. 1.0 A
  • $ … Designation of Version
$ Output Voltage Type Auto-discharge VSET
A Fixed No 0.6 V to 3.3 V
B Yes
C Adjustable No 0.6 V to 5.5 V
D Yes

* 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.

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
WLCSP-6-P6 RP509Z RP509Z
SOT-23-6 RP509N RP509N (-FE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

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