XC9252 Datasheet, PDF (1/28 Pages) Torex Semiconductor – Low Power Consumption Step-down DC/DC Controller IC

XC9252 Series
Low Power Consumption Step-down DC/DC Controller IC
ETR05038-004
■GENERAL DESCRIPTION
The XC9252 series is a 30V operation step-down DC/DC controller IC. The external P-ch driver transistor is used to achieve a stable operation
under low input voltage. Low ESR capacitors such as ceramic capacitors can be used for the load capacitor (C_L).
A 0.8V reference voltage source is incorporated, and the output voltage can be set freely from 1.5V using external resistors (R_FB1, R_FB2).
280kHz to 550kHz can be selected for the switching frequency by connecting an external resistor to the R_OSC pin. The generation of unneeded
noise can be reduced by this synchronization with an external CLK within ±25% of the internal clock using the MODE/SYNC pin. In automatic
PWM/PFM control, the IC operates by PFM control when the load is light to achieve high efficiency over the full load range from light to heavy.
The soft start time can be set as desired by adding an external capacitance to the SS pin.
With the built-in UVLO function, the driver transistor is forced OFF when input voltage becomes 2.5V or lower.
Internal protection circuits include over current protection, short-circuit protection, and thermal shutdown circuits to enable safe use.
■APPLICATIONS
●Car navigation systems
●Car audios
●ETC automotives
■FEATURES
Input Voltage Range
FB Voltage
Supply Current
Oscillation Frequency
External Clocking Synchronous
Control Method
Soft-Start
Protection Circuits
Output Capacitor
Operating Ambient Temperature
Packages
Environmentally Friendly
: 3.0V～30V (Absolute MAX. Rating: 36V)
: 0.8V (±2%)
: 30μA (@300kHz)
: 280kHz～550kHz (External Resistor)
:±25% of the internal clock
: PWM control (MODE:H)
PWM/PFM (MODE:L)
: External set (External C)
: Over current limit (External Resistor)
Automatic Return (XC9252A/B)
Integral latch protection (XC9252C)
Thermal shutdown
: Low ESR Capacitor
: -40℃～+105℃
: TSSOP-16 (XC9252A/C)
USP-10B (XC9252B)
: EU RoHS Compliant, Pb Free
■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE
CHARACTARISTICS
XC9252x08A(V_IN=12V, V_OUT=5.7V, ｆ_OSC=280kHz)
L=22μH(CLF12555-220M), CIN=10μF(GRM32ER71H106KA12L),
ROSC=300kΩ, CL=22μF×2 (GRM32ER71E226KE15L),
RSENSE=50mΩ, PchMOSFET:2SJ668, SBD:CMS15
100
90
80
70
60
50
40
30
20
PFM(MODE=L)
10
PWM(MODE=H)
0
1
10
100
1000
10000
Output Current :I_OUT[mA]
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