XC9515_1 Datasheet, PDF (1/21 Pages) Torex Semiconductor – 2 channel Synchronous Step-Down DC/DC Converter with Manual Reset

XC9515 Series
2 channel Synchronous Step-Down DC/DC Converter with Manual Reset
ETR0706-010
■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
■FEATURES
●DVDs
●Blue-ray Disk
●LCD TVs, LCD modules
●Multifunctional printers
DC/DC Block
Input Voltage Range
Output Voltage
Oscillation Frequency
: 2.5V～5.5V
: V_OUT1=1.2V～4.0V
V_OUT2=1.2V～4.0V
(Accuracy ±2%)
: 1MHz (Accuracy ±15%)
●Photo printers
●Set top boxes
High Efficiency
Output Current
Control
: 95% (V_IN=5V, V_OUT=3.3V)
: 800mA
: 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
VIN
CIN1
NC
PVSS
1
NC
PVSS
2
NC
CIN2
L1
VOUT1
EN1
EN2
VOUT
1
MR
AVSS
Cd
VOUT
2
L2
CL1
MR
Cd
RUP _CL2
VDOUT
VOUT2
■ TYPICAL PERFORMANCE
CHARACTERISTICS
● Efficiency vs. Output Current
100
90
80
70
60
50
40
30
20
10
0
1
V_IN=5V, f_OSC=1MHz, L=4.7μH (CDRH4D^V2^I8^NC⁼⁵)^V,FOSC=1MHz
L=4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)
C_IN=10μF (ceramic), C_L=10μF (ceramic)
V OUT=3.3V
V OUT=1.5V
V OUT=1.8V
10
100
Output Current : IOUT [mA]
1000
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