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PDF XC9235 Data sheet ( Hoja de datos )
| Número de pieza | XC9235 | |
| Descripción | (XC9235 - XC9237) Synchronous Step-Down DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XC9235 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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XC9235/XC9236/XC9237 Series
ETR0514-007
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
GENERAL DESCRIPTION
GreenOperation Compatible
The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42
www.Pd-actahsahneneet4l ud.rciovmer transistor and 0.52 N-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs
enable a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two
capacitors connected externally. Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from
0.8V to 4.0V in increments of 50mV (accuracy: 2.0%). With the built-in oscillator, ether 1.2MHz or 3.0MHz can be selected
for suiting to your particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is
automatic PWM/PFM switching control and the XC9237 series can be manually switched between the PWM control mode and
the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of
loads (from light load to heavy load).
The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce
current consumption to as low as 1.0 A or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal
P-channel driver transistor is forced OFF when input voltage becomes 1.4V or lower.
The XC9235B/XC9236B/XC9237B series provide short-time turn-on by the soft start function internally set in 0.25 ms (TYP).
The XC9235B(C)/XC9236B(C)/XC9237B(C) integrate CL auto discharge function which enables the electric charge at the output
capacitor CL to be discharged via the internal auto-discharge switch located between the LX and VSS pins. When the devices
enter stand-by mode, output voltage quickly returns to the VSS level as a result of this function.
Two types of package SOT-25 and USP-6C are available.
APPLICATIONS
Mobile phones
Bluetooth equipment
PDAs, portable communication modem
Portable games
Digital cameras, video cameras
Cordless phones
Notebook computers
FEATURES
P-ch Driver Transistor Built-In : ON resistance 0.42
N-ch Driver Transistor Built-In : ON resistance 0.52
Input Voltage
Output Voltage
High Efficiency
Output Current
: 2.0V ~ 6.0V
: 0.8V ~ 4.0V
: 92% (TYP.)
: 600mA
Oscillation Frequency
: 1.2MHz, 3.0MHz (+15%)
Maximum Duty Cycle
: 100%
Control Methods
Soft-Start Circuit Built-In
: PWM (XC9235)
PWM/PFM Auto (XC9236)
PWM/PFM Manual (XC9237)
Current Limiter Circuit Built-In (Constant Current & Latching)
Low ESR Ceramic Capacitor Compatible
Packages
: SOT-25, USP-6C
CL High Speed Discharge
XC9235B(C)/XC9236B(C)/XC9237B(C) Series
High Speed Soft Start
XC9235B/XC9236B/XC9237B Series
* Performance depends on external components and wiring on the PCB.
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current FOSC=1.2NHz, VOUT=1.8V
100 PWM/PFM Automatic Sw itching Control
90
80
70 VIN= 4.2V
60 3.6V
50 2.4V
40
30
PWM Control
VIN= 4.2V
3.6V
2.4V
20
10
0
0.1 1 10 100 1000
Output Current:IOUT(mA)
1/28
1 page  
XC9235/XC9236/XC9237
Series
ELECTRICAL CHARACTERISTICS (Continued)
XC9237A18Dxx, VOUT=1.8V, FOSC=3.0MHz, Ta=25℃
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNIT CIRCUIT
www.datasheOeut4tup.uctomVoltage
VOUT
When connected to external components,
VIN=VCE=5.0V, IOUT=30mA
1.764
Operating Voltage Range
Maximum Output Current
VIN
IOUTMAX
2.0
VIN=VOUT(E)+2.0V, VCE=1.0V,
When connected to external
components
(*9)
600
U.V.L.O. Voltage
VUVLO
VCE=VIN, VOUT=0V,
Voltage which Lx pin
holding
“L”
level
(*1,*11)
1.00
Supply Current
IDD VIN=VCE=5.0V, VOUT=VOUT(E) 1.1V
-
Stand-by Current
ISTB VIN=5.0V, VCE=0V, VOUT=VOUT(E) 1.1V
-
Oscillation Frequency
FOSC
When connected to external components,
VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA
2550
PFM Switching Current
Maximum IPFM Limit
Maximum Duty Cycle
IPFM
MAXIPFM
MAXDTY
When connected to external components,
VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA (*12)
VCE=VIN=(C-1), IOUT=1mA (*12)
VIN=VCE=5.0V, VOUT=VOUT(E) 0.9V
170
-
100
Minimum Duty Cycle
MINDTY VIN=VCE=5.0V, VOUT=VOUT(E) 0.1V
Efficiency
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Lx SW "H" Leak Current (*5)
Lx SW "L" Leak Current (*5)
Current Limit (*10)
EFFI
RLxH
RLxH
RLxL
RLxL
ILeakH
ILeakL
ILIM
When connected to external components,
VCE=VIN VOUT(E)+1.2V, IOUT=100mA
VIN=VCE=5.0V, VOUT =0V, ILx=100mA (*3)
VIN=VCE=3.6V, VOUT =0V, ILx=100mA (*3)
VIN=VCE=5.0V (*4)
VIN=VCE=3.6V (*4)
VIN=VOUT=5.0V, VCE=0V, Lx=0V
VIN=VOUT=5.0V, VCE=0V, Lx=5.0V
VIN=VCE=5.0V, VOUT=VOUT(E) 0.9V (*8)
Output Voltage
VOUT
Temperature Characteristics VOUT topr
IOUT=30mA, -40
Topr 85
CE "H" Voltage
VCEH
VVoOlUtaT=g0eVc,hAapnpglieesdLvxolttoag“He”toleVveClE,(*11)
CE "L" Voltage
VCEL
VOUT=0V, Applied voltage
Voltage changes Lx to “L”
tloevVeClE(,*11)
PWM "H" Level Voltage
VPWMH
When connected to external components,
IOUT=1mA (*6), Voltage which oscillation
frequency becomes 2550kHz FOSC
3450kHz (*13)
-
-
-
-
-
-
-
-
900
-
0.65
VSS
-
PWM "L" Level Voltage
VPWML
When connected to external components,
IOUT=1mA
frequency
(*6), Voltage which
becomes FOSC
oscillation
2550kHz (*13)
VIN –
0.25
CE "H" Current
CE "L" Current
Soft Start Time
Latch Time
Short Protection
Threshold Voltage
ICEH
ICEL
TSS
TLAT
VSHORT
VIN=VCE=5.0V, VOUT=0V
VIN=5.0V, VCE=0V, VOUT=0V
When connected to external components,
VCE=0V VIN, IOUT=1mA
VIN=VCE=5.0V,
Short Lx at 1
VrOeUsTi=st0a.n8ceV(*O7)UT(E),
Sweeping VOUT, VIN=VCE=5.0V, Short Lx at
1 resistance, VOUT voltage
becomes “L” level within 1ms
which
(*4)
Lx
- 0.1
- 0.1
0.5
1.0
0.675
1.800
-
-
1.40
21
0
3000
220
200
-
-
86
0.35
0.42
0.45
0.52
0.01
0.01
1050
100
-
-
-
-
-
-
0.9
-
0.900
1.836
6.0
-
V
V
mA
1.78
35
1.0
3450
V
A
A
kHz
270 mA
300 %
-%
0%
-%
0.55
0.67
0.66
0.77
1.0
1.0
1350
A
A
mA
- ppm/
VIN V
0.25 V
VIN -
1.0
V
-V
0.1 A
0.1 A
3.0 ms
20 ms
1.150 V
-
-
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Setting Voltage
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage output current ) ( input voltage input current) } 100
*3: ON resistance ( )= (VIN - Lx pin measurement voltage) 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10 A (maximum) may leak.
*6:The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the
operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus
0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7:Time until it short-circuits VOUT with GND via 1 of resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude IPFM and MAXIPFM because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions.
5/28
5 Page 
XC9235/XC9236/XC9237
Series
OPERATIONAL DESCRIPTION (Continued)
CL High Speed Discharge
XC9235B(C)/ XC9236B(C)/ XC9237B(C) series can quickly discharge the electric charge at the output capacitor (CL) when
a low signal to the CE pin which enables a whole IC circuit put into OFF state, is inputted via the N-channel transistor
www.dalotacsahteeedt4bue.tcwomeen the LX pin and the VSS pin. When the IC is disabled, electric charge at the output capacitor (CL) is quickly
discharged so that it may avoid application malfunction. Discharge time of the output capacitor (CL) is set by the CL
auto-discharge resistance (R) and the output capacitor (CL). By setting time constant of a CL auto-discharge resistance
value [R] and an output capacitor value (CL) as ( =C x R), discharge time of the output voltage after discharge via the N
channel transistor is calculated by the following formulas.
V = VOUT(E) x e –t/ , or t=τln (VOUT(E) / V)
V : Output voltage after discharge
VOUT(E) : Output voltage
t: Discharge time,
:CxR
C= Capacitance of Output capacitor (CL)
R= CL auto-discharge resistance
Output Voltage Dischage Characteristics
Rdischg = 300Ω（TYP）
100
90
80
70
60
50
40
30
20
10
0
0
CL=10uF
CL=20uF
CL=50uF
10 20 30 40 50 60 70 80 90 100
Discharge Time t (ms)
11/28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet XC9235.PDF ] | |
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