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PDF XC9509 Data sheet ( Hoja de datos )
| Número de pieza | XC9509 | |
| Descripción | Synchronous Step-Down DC/DC Converter | |
| Fabricantes | Torex Semiconductor | |
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XC9509 Series
Synchronous Step-Down DC/DC Converter
with Built-In LDO Regulator in Parallel Plus Voltage Detector
ETR1006_001
GENERAL DESCRIPTION
The XC9509 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in parallel with the
DC/DC converter's output. A voltage detector is also built-in. Since the input for the LDO voltage regulator block comes
from the input power supply, it is suited for use with various applications.
The DC/DC converter block incorporates a P-channel driver transistor and a synchronous N-channel switching transistor.
With an external coil, diode and two capacitors, the XC9509 can deliver output currents up to 600mA at efficiencies over 90%.
The XC9509 is designed for use with small ceramic capacitors.
A choice of three switching frequencies are available, 300kHz, 600kHz, and 1.2MHz. Output voltage settings for the DC/DC
and VR are set-up internally in 100mV steps within the range of 0.9V to 4.0V (± 2.0%). For the VD, the range is of 0.9V to
5.0V (± 2.0%). The soft start time of the series is internally set to 5ms. With the built-in U.V.L.O. (Under Voltage Lock Out)
function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4 V or lower. The functions of
the MODE pin can be selected via the external control pin to switch the DC/DC control mode and the disable pin to shut down
either the DC/DC block or the regulator block.
APPLICATIONS
CD-R / RW, DVD
HDD
PDAs, portable communication modem
Cellular phones
Palmtop computers
Cameras, video recorders
FEATURES
Input Voltage Range
Low ESR Capacitor
VD Function
Small Package
: 2.4V ~ 6.0V
: Ceramic capacitor compatible
: Sense internally either VDD, DCOUT,
or VROUT. N-ch open drain output
: MSOP-10, USP-10
<DC/DC Converter Block>
Output Voltage Range : 0.9V ~ 4.0V (Accuracy 2%)
Output Current
: 600mA (for MSOP-10 package)
400mA (for USP-10 package)
Control Method
: PWM or PWM/PFM Selectable
Oscillation Frequency : 300kHz, 600kHz, 1.2MHz
TYPICAL APPLICATION CIRCUIT
<Regulator Block>
Reglator Output
: Parallel Input to DC/DC Converter
Output Voltage Range : 0.9V ~ 4.0V (Accuracy 2%)
Current Limit
: 300mA
Dropout Voltage
: 80mV @ IOUT=100mA (VOUT=2.8V)
High Ripple Rejection : 60dB @1kHz (VOUT=2.8V)
TYPICAL PERFORMANCE
CHARACTERISTICS
XC9509Hxxxx
VIN=3.6V, Topr=25 , L=4.7 H (CDRH4D28C),
CIN:4.7 F (ceramic), CL1:10 F (ceramic), CL2: 4.7 F (ceramic)
MSOP-10 (TOP VIEW)
* Please refer to the typical application circuit when
external components are selected.
1/41
1 page  
XC9509
Series
ELECTRICAL CHARACTERISTICS (Continued)
XC9509xxxCAx (Continued)
Regulator (3.3V product)
PARAMETER
SYMBOL
CONDITIONS
Supply Current * XC9509H/K/L
IDD_VR
Output Voltage
VROUT(E)
IROUT=30mA
Maximum Output Current
Imax2
Load Regulation
U VROUT 1mA<IROUT<100mA
Dropout Voltage 1 (*6)
Vdif 1
IROUT=30mA
Dropout Voltage 2
Vdif 2
IROUT=100mA
Line Regulation
U VROUT
IROUT=30mA
(UVIN VROUT) 4.3V<VIN<6.0V
Current Limit
Ilim2 VROUT=VROUT(E) x 0.9
Short-Circuit Current
Ishort
VROUT=VSS
Ripple Rejection Rate
Output Voltage
Temperature Characteristics
PSRR
VIN=4.3VDC+0.5Vp-pAC,
IROUT=30mA, f=1kHz
U VROUT
IROUT=30mA
(UTopr VROUT) -40OC<Topr<85
MIN.
-
3.234
200
-
-
-
-
240
-
-
-
TYP.
40
3.300
-
15
20
60
0.05
300
30
60
100
MAX.
80
3.366
-
50
50
110
Topr=25
UNITS CIRCUIT
A1
V2
mA 2
mV 2
mV 2
mV 2
0.25 %/V
2
- mA 7
- mA 7
- dB 12
- ppm/ 2
Detector (2.7V product)
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNITS CIRCUIT
Detect Voltage
Hysteresis Range
VDF(E)
VHYS
CE=0V
VHYS=[VDR(E) (*11) - VDF(E)] / VDF(E) x 100
2.646
2
2.700
5
2.754
8
V
%
8
8
Output Current
* XC9509A/D/H
IVD VIN=2.4V, VDOUT=0.5V, CE=0V
0.5 -
- mA 9
Output Current
* XC9509B/C/E/F/K/L
IVD VIN=2.4V, VDOUT=0.5V, CE=0V
1.0 -
- mA 9
Output Voltage
Temperature Characteristics
U VDF
-40OC<Topr<85
(UTopr VDF)
ppm/
- 100 -
Test conditions: Unless otherwise stated:
DC/DC : VIN=3.6V [@ DCOUT:1.5V]
VR: VIN = 4.3V (VIN=VROUT(T) + 1.0V)
VD: VIN=5.0V
Common conditions for all test items: CE=VIN, MODE=0V
VROUT(T) : Setting Output Voltage
NOTE:
*1 : Including VD supply current (VD operates when in stand-by mode.)
*2 : Including hysteresis operating voltage range.
*3 : ON resistance ( )= 0.05 (V) / ILX (A)
*4 : EFFI = { ( output voltage x output current ) / ( input voltage x input current) } x 100
*5 : Time until it short-circuits DCOUT with GND through 1 of resistance from a state of operation and is set to DCOUT=0V from
current limit pulse generating.
*6 : Vdif = (VIN1 (*7) - VROUT1 (*8) )
*7 : VIN 1 = The input voltage when VROUT1 appears as input voltage is gradually decreased.
*8 : VROUT1 = A voltage equal to 98% of the output voltage whenever an amply stabilized IOUT {VROUT(T) + 1.0V} is input.
*9 : Current limit = When VIN is low, limit current may not be reached because of voltage falls caused by ON resistance or
serial resistance of coils.
*10: Integral latch circuit=latch time may become longer and latch operation may not work when VIN is 3.0V or more.
*11: VDR(E) = VD release voltage
*12: When temperature is high, a current of approximately 5.0 A (maximum) may leak.
*13: When using the IC with a regulator output at almost no load, a capacitor should be placed as close as possible between
AVDD and AGND (CIN2), connected with low impedance. Please also see the recommended pattern layout for your
reference. Should it not be possible to place the input capacitor nearby, the regulated output level may increase up to
the VDD level while the load of the DC/DC converter increases and the regulator output is at almost no load.
8
5/41
5 Page 
XC9509
Series
OPERATIONAL EXPLANATION (Continued)
Voltage Detector
The detector block of the XC9509 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or
VROUT internally.
(N-channel Open Drain Type)
<CE Pin Function>
The operation of the XC9509 series' DC/DC converter block and voltage regulator block will enter into the shut down
mode when a low level signal is input to the CE pin. During the shut down mode, the current consumption occurs only
in the detector and is 3.0 A (TYP.), with a state of high impedance at the Lx pin and the DCOUT pin. The IC starts its
operation by inputting a high level signal to the CE pin. The input to the CE pin is a CMOS input and the sink current is
0 A (TYP.).
<MODE Pin Function>
The operation of the XC9509A to C series' voltage detector block will enter into stand-by mode when a high level signal is
input to the MODE pin. When a low level signal is input, the voltage regulator block will enter into stand-by mode.
However, if the IC enters into stand-by mode via the CE pin, the voltage regulator block also shuts down. Likewise, if
the XC9509D to F series enters into stand-by mode via the CE pin, the DC/DC converter block can also shut down.
With the XC9509H to L series control can be PWM control when the MODE pin is 'H' level and PWM/PFM automatic
switching control when the MODE pin is 'L' level.
NOTES ON USE
Application Information
1. The XC9509 series is designed for use with a ceramic output capacitor. If, however, the potential difference
between dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high
switching energy and oscillation could occur on the output. If the input-output potential difference is large, connect
an electrolytic capacitor in parallel to compensate for insufficient capacitance.
2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly
influenced by external component selection, such as the coil inductance, capacitance values, and board layout of
external components. Once the design has been completed, verification with actual components should be done.
3. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there
is the possibility that some cycles may be skipped completely.
4. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted
and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.
DC/DC Waveform (3.3V, 1.2MHz)
<External Components>
L :4.7 H(CDRH4D28C,SUMIDA)
CIN :4.7 F(ceramic)
CL :10 F(ceramic)
<E<xEtextrenranlaCl oCmompopnoennetns>ts>
L L :4:.47.7 H(HC(DCRDHR4HD42D82C8,CS,USMUMIDIAD)A)
CICNIN :4:.47.7 F(Fc(ecrearmamic)ic)
CLCL :1:010 F(Fc(ecrearmamic)ic)
11/41
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XC9509.PDF ] | |
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