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RP901 Series
PWM/VFM Step-down DCDC Converter with Synchronous Rectifier Equipped with VR and VD

Product Specifications

The RP901 Series are CMOS-based PWM/VFM step-down DC/DC converters equipped with voltage regulator and voltage detector. The DC/DC converter can be selected from two control types - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current.

RP901 was developed for applications that require multiple power supplies such as storage devices. It integrates an 800mA* (A/B/C Version) / 900mA* (D Version) output current step-down DC/DC converter, a 600mA output current LDO regulator, and a voltage detector with a built-in delay circuit into a small package. The regulator can be started after soft start of the DC/DC converter by sequence control. (A/B Version)

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

FEATURES

Input Voltage Range (Maximum Rating) 4.5 V to 5.5 V (6.5V)
Supply Current Typ. 460 µA(at PWM mode)
Typ. 170 µA (at light load applied to B, C, D versions)
Standby Current Typ. 1 µA (A Version, CE="L")
Typ. 2 µA (B/C/D Version, CE="L")
Thermal shutdown circuit Detecting Temperature: Typ. 165°C,
Released temperature: Typ. 110°C
Package DFN(PLP)2527-10
External components CIN = 10.0 µF
COUT1 = 10.0 µF, L = 4.7 µH (DC/DC)
COUT2 = 2.2 µF (VR)
Step-down DC/DC Converter
Output Voltage Range 1.2 V to 1.8 V (0.1V steps)
Output Voltage Tolerance ±2%
Oscillator Frequency Typ. 1.2 MHz
Built-in driver ON resistance Typ. P-channel 0.25Ω, N-channel 0.25Ω (at VIN=5V)
Soft-start function Typ. 1 ms
Lx peak current limit function Typ. 1.4 A (D version: 1.5 A)
Output Current Min. 800 mA (D version: 900 mA)
Protection Delay Time Typ. 0.1 ms (applied to B, C, D versions)
UVLO function Typ. 3.5 V
Chip enable function "H" active
LDO Regulator
Output Voltage Range 2.5 V to 3.3 V (0.1V steps)
Output Voltage Tolerance ±1.0%
Output Current Min. 600 mA
Fold-back Protection Circuit Current limit Typ. 70mA
Start-up delay time Typ. 2 ms (applied to A, B versions)
Auto-Discharge function at turning off Discharge resistance Typ.50Ω (at VIN=5V)
VD
Voltage Detector Threshold Range 2.0 V to 3.0 V (A version: VR output voltage is supervised),
3.0 V to 5.0 V (B, C, D versions: Input voltage is supervised)
Detector Threshold Accuracy ±2%
Released Delay Time Typ. 50 ms

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current

PIN DESCRIPTION

DFN(PLP)2527-102.5 mm × 2.7 mm

DFN(PLP)2527-10

1 CE
2 VDOUT
3 AGND**
4 PGND**
5 Lx
6 PVDD**
7 NC
8 VOUT1
9 AVDD**
10 VOUT2

*) The tab is substrate level (GND).
**) No.3 pin and No.4 pin, No.6 pin and No.9 pin must be wired each other when it is mounted on board.


RP901 Series for Consumer

APPLICATIONS

  • Optical Disk Equipment

SELECTION GUIDE

In the RP901 series, the output voltage combination and function can be designated.

Product Name   Package Quantity per Reel
RP901Kxxx#-TR Consumter DFN(PLP)2527−10 5,000
  • xxx … Serial number to describe the voltage combination of DC/DC converter, voltage regulator, and voltage detector.
  • # … Function version
A DC/DC control type is PWM-fixed, without protection delay time, output current Min. 800mA,
VR has start-up delay time to make a sequence.
VD supervises the output of VR (Reset is output at UVLO and over current of DC/DC)
B DC/DC control type is PWM/VFM automatic mode shift, with protection delay time, output current Min. 800mA,
VR has start-up delay time to make a sequence.
VD supervises the input voltage.
C DC/DC control type is PWM/VFM automatic mode shift, with protection delay time, output current Min. 800mA,
VR: without delay time to make a sequence,
VD supervises the input voltage.
D DC/DC control type is PWM/VFM automatic mode shift, with protection delay time, output current Min. 900mA,
VR: without delay time to make a sequence,
VD supervises the input voltage.

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2527-10 RP901K RP901K

*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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