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PDF XC9252 Data sheet ( Hoja de datos )
| Número de pieza | XC9252 | |
| Descripción | Low Power Consumption Step-down DC/DC Controller IC | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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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 (CL).
A 0.8V reference voltage source is incorporated, and the output voltage can be set freely from 1.5V using external resistors (RFB1, RFB2).
280kHz to 550kHz can be selected for the switching frequency by connecting an external resistor to the ROSC 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(VIN=12V, VOUT=5.7V, ｆOSC=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 :IOUT[mA]
1/28
1 page  
XC9252
Series
■ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
Ta=25℃
UNITS
VIN Pin Voltage
CE Pin Voltage
FB Pin Voltage
VL Pin Voltage
VL Pin Current
SS Pin Voltage
ROSC Pin Voltage
MODE/SYNC Pin Voltage
PG Pin Voltage (*6)
PG Pin Current (*6)
CLAMP Pin Voltage
CLAMP Pin Current
ISENSE Pin Voltage
EXTB Pin Voltage
EXTB Pin Current
Power
Dissipation
TSSOP-16
USP-10B
Surge Voltage
Operating Ambient Temperature
Storage Temperature
VIN
VCE
VFB
VVL
IVL
VSS
VROSC
VMODE
VPG
IPG
VCLAMP
ICLAMP
VISENSE
VEXT
IEXT
Pd
VSURGE
Topr
Tstg
-0.3 ～ +36
-0.3 ～ +36
-0.3 ～ +6.5
-0.3 ～ VIN+0.3 or +6.5 (*1)
10
-0.3 ～ VVL+0.3 or +6.5 (*2)
-0.3 ～ VVL+0.3 or +6.5 (*2)
-0.3 ～ +6.5
-0.3 ～ +6.5
5
-0.3 or VIN-6.5 (*4) ～ VIN+0.3 or +36 (*3)
10
-0.3 or VIN-6.5 or VCLAMP-0.3 (*5) ～ VIN+0.3 or +36 (*3)
-0.3 or VIN-6.5 or VCLAMP-0.3 (*5) ～ VIN+0.3 or +36 (*3)
100
350
150
46 (*7)
-40～+105
-55～+125
V
V
V
V
mA
V
V
V
V
mA
V
mA
V
V
mA
mW
-
℃
℃
* All voltages are described based on the GND pin.
(*1) The maximum value should be either VIN+0.3 or +6.5 in the lowest.
(*2) The maximum value should be either VVL+0.3 or +6.5 in the lowest.
(*3) The maximum value should be either VIN+0.3 or +36 in the lowest.
(*4) The minimum value should be either -0.3 or VIN-6.5 in the highest.
(*5) The minimum value should be either -0.3 or VIN-6.5 or VCLAMP-0.3 in the highest.
(*6) For the XC9252 Type A and C only.
(*7) Applied Time≦400ms
5/28
5 Page 
XC9252
Series
■TYPICAL APPLICATION CIRCUIT (Continued)
<Limit current setting>
In the XC9252 series, a resistance can be connected between the VIN pin and ISENSE pin to set a limit current. The sense
resistance (RSENSE) is determined by the equation below.
RSENSE = VLIM / ILIM
ILIM: Limit current (peak current) [A]
RSENSE: Sense resistance [mΩ]
VLIM= (230-(0.2765×fOSCSET)): Limit current detection voltage [mV]
fOSCSET: Set frequency [kHz]
200
180
160
140
120
100
80
60
40
20
0
100
Calculated value (VLIM, Ta=25℃)
Calculated value (VLIMMIN, Reference value)
150 200 250
ROSC(kΩ)
300
* The limit current detection voltage VLIM varies depending on
the temperature. Set the limit current (reference value)
using the lower limit value given by the equation below.
VLIMMIN=(230-(0.33×fOSCSET)) x 0.85
VLIMMIN: Lower limit value within operating temperature range
(-40 to 105℃)
ILIMMIN=VLIMMIN / RSENSE [A]
【Calculation Example】
To set ILIM to 3A with fOSCSET=460kHz
RSENSE=(230-(0.2765×460)) / 3 ≒ 34 [mΩ]
In this case, the lower limit value of the limit current is ILIMMIN = (230-(0.33×460)) x 0.85 / 34=1.95 [A]
<Soft-start function>
The soft-start time of the XC9252 series can be adjusted externally (SS pin). The soft-start time is the time from the start of VCE
until the output voltage reaches 90% of the set voltage. The soft-start time depends on the external capacitance CSS, and is
determined by the equation below.
tSS2=0.002 x CSS / ISS [ms]
CSS: External capacitance [pF]
ISS=fOSCSET / 300 [μA , TYP.]
fOSCSET: Set frequency [kHz]
* Note that the value of the soft-start time tSS2 varies depending on the effective capacitance value of the delay capacitance CSS.
【Calculation Example】
When fOSCSET=460kHz, CSS=4700pF
tSS2=0.002×4700/(460/300)=6.13ms
The minimum value tSS1 of the soft-start time is set internally to about 0.8ms @460kHz (TYP.). The internal soft-start time is
determined by the equation below.
tSS1=368 / fOSCSET [ms]
fOSCSET: Set frequency [kHz]
VCE
VOUT
tSS1
tSS2
90% of setting voltage
11/28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet XC9252.PDF ] | |
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