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2 channel Synchronous Step-Down DC/DC Converter with Manual Reset

VIN

NC

NC

PVSS

1

NC

PVSS

2

VOUT

1

VOUT

2

MR

AVSS

Cd

VOUT1

CIN1

CL1

CIN2

MR

VDOUT

L1

L2

Cd

VOUT2

EN2

EN1

CL2

RUP

VIN=5V,FOSC=1MHz

L=4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

0

10

20

30

40

50

60

70

80

90

100

1

10

100

1000

Output Current : IOUT [mA]

VOUT=1.5V

VOUT=3.3V

VOUT=1.8V

ETR0706-008

■GENERAL DESCRIPTION

The XC9515 series consists of 2 channel synchronous step-down DC/DC converters and a voltage detector with delay circuit

built-in. The DC/DC converter block incorporates a P-channel 0.35Ω (TYP.) driver transistor and a synchronous N-channel

0.35Ω (TYP.) switching transistor. By minimizing ON resistance of the built-in transistors, the XC9515 series can deliver

highly efficient and a stable output current up to 800mA. With high switching frequencies of 1MHz, a choice of small inductor

is possible. The series has a built-in UVLO (under-voltage lock-out) function, therefore, the internal P-channel driver

transistor is forced OFF when input voltage becomes 1.8V or lower (for XC9515A, 2.7V or lower). The voltage detector block

can be set delay time freely by connecting an external capacitor. With the manual reset function, the series can output a

reset signal at any time.

■APPLICATIONS

●DVDs

●Blu-ray Disk

●LCD TVs, LCD modules

●Multifunctional printers

●Photo printers

●Set top boxes

■FEATURES

DC/DC Block

Input Voltage Range

: 2.5V∼5.5V

Output Voltage

(Accuracy ±2%)

Oscillation Frequency

: 1MHz (Accuracy ±15%)

High Efficiency

Output Current

: 800mA

Control

: PWM control

Protection Circuits

: Thermal Shutdown

: Integral Latch (Over Current Limit)

: Short Protection Circuit

Ceramic Capacitor Compatible

Voltage Detector (VD) Block

Detect Voltage Range

: 2.0∼5.5V（Accuracy ±2%）

Delay Time

: 173 ms

(When Cd=0.1μF is connected)

Output Configuration

: N-channel open drain

Package

: QFN-20

■TYPICAL APPLICATION CIRCUIT

■ TYPICAL PERFORMANCE

CHARACTERISTICS

● Efficiency vs. Output Current