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PDF XC9504 Data sheet ( Hoja de datos )
| Número de pieza | XC9504 | |
| Descripción | Step-up / Inverting DC/DC Controller ICs | |
| Fabricantes | Torex Semiconductor | |
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XC9504 Series
2ch. Step-up / Inverting DC/DC Controller ICs
Mar. 20, 2003 Ver 3
2ch DC/DC Controller (Step-up + Inverting)
Input Voltage Range 0.9V ~ 10.0V
Output Voltage Externally Set-Up
Oscillation Frequency 180kHz (±15%)
Max Duty Ratio 80% (TYP)
PWM, PWM/PFM Switching Control
MSOP-10 Package
General Description
The XC9504 series are PWM control, PWM/PFM switching, 2
channel (step-up and inverting) DC/DC controller ICs.
With 0.9V of standard voltage supply internal, and using
externally connected components, the output 1 voltage (step-up
DC/DC controller) can be set freely within a range of 1.5V ~
30V. Since output 2 (inverting DC/DC controller) has a built-in
0.9V reference voltage (accuracy ±2), a negative voltage can be
set with the external components.
With a 180kHz frequency, the size of the external components
can be reduced. Switching frequencies of 300kHz and 500kHz
are also available as custom-designed products.
The control of the XC9504 series can be switched between
PWM control and PWM/PFM automatic switching control using
external signals. Control switches from PWM to PFM during
light loads when automatic switching is selected and the series
is highly efficient from light loads through to large output
currents. Noise is easily reduced with PWM control since the
frequency is fixed.
The series gives freedom of control selection so that control
suited to the application can be selected.
Soft-start time is internally set to 10msec (output 1)
which offers protection against rush currents and voltage
overshoot when the power is switched on .
Applications
Power Supplies for LCD
PDAs
Palm Top Computers
Portable Audio Systems
Various Multi-function Power Supplies
Features
2ch. DC/DC Controllers
Output 1: Step-up DC/DC Controller
Output 2: Inverting DC/DC Controller
Power Supply Voltage Range 2.0V ~ 10V
Output Voltage Range
Output 1:
1.5V ~ 30.0V
(Step-up DC/DC Controller)
Can be set freely with 0.9V(±
2.0%) of reference voltage
supply & external components
Output 2:
(Inverting DC/DC Controller)
-30V ~ 0V
Can be set freely with 0.9V(±
2.0%) of reference voltage &
external components
Oscillation Frequency
180kHz ±15%
Output Current
300kHz & 500kHz are available as custom
Output 1 : more than 20mA (VIN=3.3V,VOUT=15V)
Output 2 : more than - 20mA (VIN=3.3V,VOUT=- 7V)
Soft-Start Internally Set-Up (Output 1)
Stand-By Current
3.0µA (MAX)
Typical Perfomance Characteristics
XC9504B092A
(180kHz, Output 1 = 15V, Output 2 = - 7.5V)
L1=22µH (CDRH4D18C), CL1=- 10µF (ceramic), SD1: CRS02, Tr1:XP151A12A2M
L2=22µH (CDRH4D18C), CL2= 10µF (ceramic), SD1: CRS02, Tr2:XP152A12C0M
15.4
-7.3
15.2
VOUT1
-7.4
15.0
-7.5
14.8
VOUT2
-7.6
14.6
-7.7
Typical Application
( XC9504B092A Input: 3.3V, Output 1: 15V, Output 2: -7V )
14.4
0
10 20 30 40 50
Output Current 1,2 IOUT1,2(mA)
VOUT1=15V
SD1
IOUT1=~20mA :MA2Q735
L1:22uH
D412F
VIN=3.3V
Tr2:Pch MOSFET
XP152A12C0
SD2
:MA2Q735
VOUT2=7V
IOUT2=~20mA
RFB11 CFB1
:470kΩ :5pF
CL1
10uF
Tr1:Nch MOSFET
XP151A12A2
CIN=47uF
CDD=1uF
VPW M1
1 EXT1 EXT2/ 10
2 VDD GND 9
3 FB1
FB2 8
4 PWM1 PWM2 7
L2:22uH
D412F
CL2
:10uF
RFB21
24kΩ
CFB21
=0.1uF
VPW M2
RFB12 :30kΩ
VEN1
5 EN1
EN2 6
VEN2
RFB22
:43kΩ
-7.8
60
1
1 page  
XC9504 Series
2ch. Step-up / Inverting DC/DC Controller ICs
Electrical Characteristics
XC9504B093A
Common Characteristics
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage (note 1)
VDD
VDD ≥ 2.0V, IOUT=1mA
Output Voltage Range
(note 3)
VOUTSET VDD ≠ VOUT
VIN ≥ 0.9V, IOUT=1mA (note 2)
VDD=VOUT
Supply Current 1
IDD1 FB=0V, FB2=1.2V
Supply Current 1-1
IDD1-1 EN1=3.0V, EN2=0, FB1=0V
EN2=3.0V, EN1=0V, FB2=1.2V
Supply Current 1-2
IDD1-2 FB1=0V, FB2=0V
FB1=1.2V, FB2=1.2V
Supply Current 2
IDD2 FB1=1.2V, FB2=0V
Stand-by Current
ISTB Same as IDD1, EN1=EN2=0V
Oscillation Frequency
FOSC Same as IDD1
EN1, 2 "High" Voltage
VENH FB1=0V, FB2=3.0V
EN1, 2 "Low" Voltage
VENL FB1=0V, FB2=3.0V
EN1, 2 "High" Current
IENH FB1=3.0V, FB2=0V
EN1, 2 "Low" Current
IENL EN1, 2=0V, FB1=3.0V, FB2=0V
PWM1, 2 "High" Current IPWMH FB1=3.0V, FB2=0V, PWM1, 2=3.0V
PWM1, 2 "Low" Current IPWML FB1=3.0V, FB2=0V, PWM1, 2=0V
FB1, 2 "High" Current
IFBH FB1=3.0V, FB2=0.8V
FB1, 2 "Low" Current
VFBL FB1=1.0V, FB2=0V
Unless otherwise stated, VDD=3.0V, PWM1, 2=3.0V, EN1, 2 = 3.0V
VOUT1
VOUT2
VOUT1
VOUT2
MIN.
2.0
0.9
-
2.0
-
-
TYP.
-
-
-
-
-
110
MAX.
10.0
-
0.0
10.0
0.0
250
- 80 150
UNITS
V
V
V
µA
µA
- 90 200
- 80 160
- 1.0 3.0
255 300 345
0.65 -
-
- - 0.20
- - 0.50
- - -0.50
- - 0.50
- - -0.50
- - 0.50
- - -0.50
µA
µA
µA
kHz
V
V
µA
µA
µA
µA
µA
µA
Ta=25OC
TEST CIRCUIT
1
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Output 1 Characteristics
Step-up Controller
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX.
FB1 Voltage
VFB1 VDD=3.0V, VIN=1.5V, IOUT1=10mA
0.882 0.900 0.918
Operation Start-up
Voltage1
(note 2)
Using Tr: 2SD1628,
VST1-1 IOUT=1.0mA, RFB11=200kΩ, RFB12=75kΩ
VDD ≠ VOUT1 : IOUT1=10mA
- - 0.9
- - 2.0
Oscillation Start-up Voltage1 VST2-1 FB1=0V
- - 0.8
Maximum Duty Ratio1 MINDTY1 Same as IDD1
75 80 87
Minimum Duty Ratio1 MAXDTY2 Same as IDD2
- -0
PFM Duty Ratio1
PFMDTY1 No Load, VPWM1=0V
22 30 38
Efficiency1
EFFI1 IOUT1= 130mA, Nch MOSFET: XP161A1355P - 85 -
Soft-Start Time1
TSS1 VOUT1 × 0.95V, EN1=0V→0.65V
5.0 10.0 20.0
EXT1 "High" ON Resistance REXTBH1 FB1=0V, EXT1=VDD -0.4V
- 28 47
EXT1 "Low" ON Resistance REXTBL1 EN1=FB1=1.2V, EXT1=0.4V
- 22 30
PWM1 "High" Voltage VPWMH1 No Load
0.65 -
-
PWM1 "Low" Voltage VPWML1 No Load
- - 0.20
Unless otherwise stated, VDD=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V
UNITS
V
V
V
V
%
%
%
%
msec
Ω
Ω
V
V
Ta=25OC
TEST CIRCUIT
4
2
1
3
3
3
5
5
5
6
6
5
5
Output 2 Characteristics
Inverting DC/DC Controller
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX.
FB2 Voltage
VFB2 VDD=3.0V
0.882 0.900 0.918
Operation Start-up
Voltage2
VST1-2 IOUT2=1.0mA, RFB11=200kΩ, RFB12=75kΩ
RFB21=17.5kΩ, RFB22=10kΩ, EN1=PWM1=3.0V
-
- 2.0
Oscillation Start-up Voltage2 VST2-2 FB2=1.2V
- - 2.0
Maximum Duty Ratio2 MAXDTY2 Same as IDD1
75 80 87
Minimum Duty Ratio2 MINDTY3 Same as IDD2
- -0
PFM Duty Ratio2
PFMDTY2 No Load, VPWM2=0V
22 30 38
Efficiency2 (Note 4)
EFFI2 IOUT2= -150mA, Pch MOSFET: XP162A12A6P - 75 -
EXT2 "High" ON Resistance REXTBH2 EN2=FB2= 0V, EXT2=VDD-0.4V
- 28 47
EXT2 "Low" ON Resistance REXTBL2 FB2=3.0V, EXT2=0.4V
- 22 30
PWM2 "High" Voltage VPWMH2 No Load
0.65 -
-
PWM2 "Low" Voltage VPWML2 No Load
- - 0.20
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=3.0V
UNITS
V
V
V
%
%
%
%
Ω
Ω
V
V
Ta=25OC
TEST CIRCUIT
3
12
3
3
3
7
7
6
6
7
7
5
5 Page 
XC9504 Series
2ch. Step-up / Inverting DC/DC Controller ICs
Notes on how to use
Hint on application
1. Channel 1 (step-up) How to shut down the output voltage during standby mode
If the circuit configuration shown as an example of typical application circuits is used, voltage VIN will occur at VOUT 1 when the IC is
in standby, the diode being bypassed. This can cause circuits connected to VOUT 1 to malfunction.
> Example of typical application circuit 1 :
VOUT1
Pch
MOSFET1
SBD1
R1 Inside of
XC9504 IC
CL1
RFB11
CFB1
Nch
MOSFET2
RFB12
ON/OFF
signal
FB1
EN1
Set R1 so as to prevent leakage current of N-ch MOSFET 2.
> Example of typical application circuit 2 : Power Ready Function
Pch
VOUT1 MOSFET1
R1
NPN
Bip1
C1
R2
Nch
MOSFET2
ON/OFF
signal
SBD1
RFB11
CL1
CFB1
Inside of
XC9504 IC
FB1
RFB12
EN1
Time to make power ready is calculated by the equation below.
Time = - R2 x C1 x Ln (1 - 0.7 / [ON / OFF Signal Voltage ]
Set R1 so as to prevent leakage curren tof NPN (Bip 1).
Nch MOSFET 2 and the inverter enables power to be turned off quickly.
The combination of R 2, C 1, and the threshold
voltage of approximately 0.7 V of NPN Bip 1 is used
to produce a delay time between the circuits being
enabled and P-ch MOSFET 1 being switched on.
Delay time set to 20 mS ensures power to be made
ready in a favorable manner, as soft start of this
product is completed during the delay time.
Set Value (Example)
VOLTAGE (V)
R2 (kΩ)
2.5 430
3.3 470
5.0 430
C1 (µF)
0.15
0.18
0.33
2. Channel 2 ( Inverting )
Soft start circuit
Channel 2 (inverting) is subject to the overshoot of output voltage 2 (VOUT 2) at start-up. It is possible to control the overshoot of
output voltage 2 (VOUT 2), as shown by circuit example 1 in “Output Voltage Settings for Channel 2” in “Function Settings.” In this
circuit configuration, EN 1 and EN 2 are enabled (set to “H” level) simultaneously. This lets output voltage 1 (VOUT 1) of channel 1
increase gently as soft start, thereby controlling the overshoot.
> Example of typical application circuit : Improved Soft start
This example is effective when EN 1 and EN 2 are enabled with different timings under light load condition (the coil current being
discontinuous).
Time to make soft start time is calculated by the equation below.
VOUT1
Inside of
XC9504 IC
R1
Pch
MOSFET1
RFB22
FB2
EN2
SBD2
Nch
MOSFET2
ON/OFF
signal
CL2
CFB21
RFB21
VOUT2
Time SS2 = - R FB21 x C CFB21 / Ln
(0.9 - V OUT2 ) x R FB22 )
1 - (V OUT1 - 0.9) x R FB21
Example )
When VOUT1 = 15V and VOUT2 = - 7.5V,
RFB21 = 59.6kΩ, RFB22 = 100kΩ by the equation below.
VOUT2 = (0.9 - VOUT1) x (RFB21 / RFB22) + 0.9
When the light load, CFB21=0.1µF or lower value can be used.
Therefore, when CFB21=0.027µF,
Time_ss2 = 5.0mS and VOUT2 = 95% of setting value
3. Channel 2 (Inverting)
Withstand voltage of transistor
The voltage applied between the drain and source is the sum of VIN and VOUT 2.
Select a transistor with an absolute VDSS rating that is suitable for your operating conditions.
Example: The voltage applied across VDS of a transistor will be 20.0V if VIN = 5.0 V and VOUT 2 = -15.0 V.
Under this condition, a transistor with VDSS higher than 20.0V should be selected. (Use a transistor with VDSS
that is 1.5 times the applied voltage or more, as a standard.)
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XC9504.PDF ] | |
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