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XC9140 Schematic ( PDF Datasheet ) - TOREX

Teilenummer XC9140
Beschreibung Step-UpSynchronous PFM DC/DC Converter
Hersteller TOREX
Logo TOREX Logo 




Gesamt 28 Seiten
XC9140 Datasheet, Funktion
XC9140 Series
Step-Up Synchronous PFM DC/DC Converter
ETR04015-003
GENERAL DESCRIPTION
GreenOperation Compatible
The XC9140 series are step-up synchronous DC/DC converters that support ceramic capacitors and have an internal 0.6
(TYP.) Nch driver transistor and an internal 0.65(TYP.) Pch synchronous rectifier switch transistor. PFM control enables a low
quiescent current, making these products ideal for portable devices that require high efficiency.
When the output voltage is 3.3V and the load current is 1mA (XC9140Axx1 type and XC9140Cxx1 type), startup from an input
voltage of VIN = 0.9V is possible which means that these products can be used in applications that start using a single alkaline or
nickel-metal hydride battery. The output voltage can be set from 1.8V to 5.0V (±2.0%) in steps of 0.1V.
The XC9140 features a load disconnect function to break continuity between the input and output at shutdown (XC9140A), and
also a bypass mode function to maintain continuity between the input and output (XC9140C).
A version with a UVLO (Under Voltage Lock-out) function is also available. This function enables the prevention of battery leakage
by stopping IC’s operation when the input voltage is low. The standard product has a UVLO release voltage of 2.15V (±3.0%), and a
custom version with a release voltage selectable from between 1.65V to 2.2V, in steps of 0.05V, is also available.
APPLICATIONS
Mouses, Keyboards
Bluetooths
Household use Medical equipments
Remote controls
Game consoles
Devices with 1~3 Alkaline, 1~3 Nickel Hydride,
1 Lithium and 1 Li-ion
FEATURES
Input Voltage Range
Output Voltage Setting
Output Current
Driver Transistor
Supply Current
Control Method
High speed transient response
PFM Switching Current
Functions
Operating Ambient Temperature
Packages
Environmentally Friendly
: 0.9V~5.5V
: 1.8V~5.0V (±2.0%) 0.1V increments
: 100mAVOUT=3.3V, VBAT=1.8V (TYP.)
: 0.6Nch driver transistor
0.65Pch synchronous rectifier switch transistor
: 6.3μA (VBAT=VOUT+0.5V)
: PFM Control
: 50mV@VOUT=3.3V, VBAT=1.8V, IOUT=150mA
: 350mA
: Load Disconnection Function or
Bypass Mode Function
UVLO Function
Ceramic Capacitor
: -40℃~+85
: SOT-25, USP-6EL
: EU RoHS Compliant, Pb Free
TYPICAL APPLICATION CIRCUIT
L=4.7μH
LX
CE
VIN=0.9~5.5V
CCIN=IN1=04.μ7μFF
VBAT
VOUT
GND
CL=10μF
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current
XC9140A331MR-G(VOUT=3.3V)
L=4.7μH(VLF302512M-4R7M),CIN=4.7μF(LMK107BJ475MA),
100 CL=10μF(LMK107BJ106MA)
2.5V
80
60
3.0V
VBAT=1.8V
40
20
0
0.01
0.1 1
10 100
Output Current : IOUT (mA)
1000
1/28






XC9140 Datasheet, Funktion
XC9140 Series
ELECTRICAL CHARACTERISTICS (Continued)
XC9140Axxx types (types other than XC9140Axx1), with UVLO function, without CL discharge function
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
Ta=25˚C
UNITS CIRCUIT
Input Voltage
Output Voltage
Operation Start Voltage
VBAT
V (*2)
OUT(E)
VST1
-
VPULL=1.5V, Voltage to start oscillation
while VOUT is decreasing
IOUT=1mA
-
-
- 5.5 V
E1 V
-
VRELEASE(E)
(*7)
V
Operation Hold Voltage
VHLD
RL=1k
VDETECT(E)
(*8)
-
- V
Supply Current2
Input Pin Current2
Stand-by Current
LX Leak Current
PFM Switching Current
Maximum ON Time
Efficiency (*3)
Efficiency (*3)
Efficiency (*3)
LX SW “Pch” ON
Resistance (*4)
LX SW “Nch” ON
Resistance (*5)
CE “High” Voltage
Iq
IBAT
ISTB
ILXL
IPFM
tONMAX
EFFI
EFFI
EFFI
RLXP
RLXN
VCEH
Oscillation stops,
VOUT=VOUT(T)+0.5V (*1)
VOUT=VOUT(T)+0.5V (*1)
VBAT=VLX=VOUT(T) (*1), VOUT=VCE=0V
VBAT=VLX=VOUT(T) (*1), VOUT=VCE=0V
IOUT=3mA
VPULL= VRELEASE(T)+0.1V (*6),
VOUT=VOUT()×0.98V (*1)
VOUT(T) (*1)=2.5V, IOUT=30mA
VOUT(T) (*1)=3.3V, IOUT=30mA
VOUT(T) (*1)=5.0V, IOUT=30mA
VBAT=VLX=VCE=VOUT(T)+0.5V (*1),
IOUT=200mA
VBAT=VCE=3.3V, VOUT=1.7V
VBAT=VPULL= VRELEASE(T)+0.1V (*6),
VOUT=VOUT()×0.98V (*1)
While VCE=0.30.75V,
Voltage to start oscillation
E4 μA
E5 μA
-
0.1
1.0 μA
-
0.1
1.0 μA
295 350 405 mA
3.1
4.6
6.0 μs
- 81 - %
- 85 - %
- 86 - %
E3
- 0.6 -
0.75 -
5.5 V
CE “Low” Voltage
VCEL
VBAT=VPULL= VRELEASE(T)+0.1V (*6),
VOUT=VOUT()×0.98V (*1)
While VCE=0.750.3V,
Voltage to stop oscillation
GND
-
0.3 V
CE “High” Current
ICEH VBAT=VCE=VLX=VOUT=5.5V
-0.1 -
0.1 μA
CE “Low” Current
UVLO Current
UVLO Release Voltage
ICEL
IDQ
VRELEASE(E)
(*7)
VBAT=VLX=VOUT=5.5V, VCE=0V
VBAT= VCE= VDETECT(E) - 0.1V (*8),
IOUT=0mA
VPULL= VOUT= VOUT()×0.98V (*1),
VBAT= VCE
Voltage to start oscillation while
-0.1 -
E6
E7
0.1 μA
μA
V
VBAT is increasing
VPULL= VOUT= VOUT()×0.98V (*1),
UVLO Hysteresis
Voltage
V (*9)
HYS(E)
VBAT= VCE
VRELEASE(E) - Voltage to stop oscillation
0.1
0.15
0.2
V
while VBAT is decreasing(*7)
Unless otherwise stated,, VBAT=VCE=VRELEASE(T)+0.1V (*6)
(*1) VOUT(T)= Nominal Output Voltage
(*2) VOUT(E)= Effective Output Voltage
The actual output voltage value VOUT(E) is the PFM comparator threshold voltage in the IC. Therefore, the DC/DC circuit output voltage,
including the peripheral components, is boosted by the ripple voltage average value. Please refer to the characteristic example.
(*3) EFFI=[{ (Output Voltage)×(Output Current)] / [(Input Voltage)×(Input Current)}]×100
(*4) LX SW “Pch” ON resistance=(VLX-VOUT pin measurement voltage) / 200mA
(*5) The LX SW “Nch” ON resistance measurement method is shown in the measurement circuit diagram.
(*6) VRELEASE(T)= Nominal UVLO release voltage
(*7) VRELEASE(E)= Actual UVLO release voltage
(*8) VDETECT(E)=VRELEASE(E) -VHYS(E)= Actual UVLO detect voltage
(*9) VHYS(E)= Actual UVLO hysteresis voltage
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6 Page









XC9140 pdf, datenblatt
XC9140 Series
OPERATIONAL EXPLANATION
The XC9140 Series consists of a standard voltage source, a PFM comparator, a Nch driver Tr, a Pch synchronous rectifier switch Tr, a
current sense circuit, a PFM control circuit and a CE control circuit, etc. (refer to the block diagram below.)
LX
PFM Comparator Unit
CFB RFB1
RFB2
PFM
Comparator
FB -
+
VREF
Current Sense
PFM Controller
Buffer
Driver
and
Inrush
Currrent
Protection
CE
CE and Bypass
Controller Logic
Hysteresis UVLO
Comparator
+
-
Parasitic Diode
Controller
VOUT
CL
Discharge
VOUT
VOUT
GND
VDD VBAT–VOUT Detector
VBAT
Current limit PFM control is used for the control method to make it difficult for the output voltage ripple to increase even when the switching
current is superimposed, so the product can be used within a wide voltage and current range. Further, because PFM control is used, it has
excellent transient response to support low capacity ceramic capacitors to realize a compact, high-performance boost DC/DC converter.
The synchronous driver and rectifier switch Tr efficiently sends the coil energy to the capacitor connected to the VOUT pin to achieve highly
efficient operation from low to high loads.
The electrical characteristics actual output voltage VOUT(E) is the PFM comparator threshold voltage shown in the block diagram. Therefore,
the booster circuit output voltage average value, including the peripheral components, depends on the ripple voltage, so this must be carefully
evaluated before being used in the actual product.
VBAT=VCE=2.0VVOUT=3.3VIOUT=20m AL=4.7μHCL=10μFTa=25
VBAT=VCE=2.0VVOUT=3.3VIOUT=70m AL=4.7μHCL=10μFTa=25
VOUT Voltage
Average
VOUT(E)
VLX
VOUT
ILX
IPFM
VLX
VOUT
ILX
VOUT Voltage
Average
VLX:2V/div
VOUT:50m V/div
VOUT(E)
ILX:200m A/div
2[μs /div]
2[μs /div]
< Reference Voltage Source (VREF)>
The reference voltage source (VREF voltage) provides the reference voltage to ensure stable output voltage of the DC/DC converter.
< PFM Control >
The voltage from the output voltage divided by the division resistors RFB1 and RFB2 in the IC is used as feedback voltage (FB voltage), and the PFM
comparator is compared with the FB voltage and VREF. If the FB voltage is lower than VREF, the signal is sent to the buffer driver via the PFM control circuit
and the Nch driver Tr is turned ON. If the FB voltage is higher than VREF, the PFM comparator sends a signal that does not turn ON the Nch driver Tr.
The current sense circuit monitors the current flowing in the Nch driver Tr connected to the Lx pin when the Nch driver Tr is ON. When the
prescribed PFM switching current (IPFM) is reached, the signal is sent to the buffer driver via the PFM control circuit to turn OFF the Nch driver Tr
and turn ON the Pch synchronous rectifier switch Tr.
The Pch synchronous rectifier switch Tr ON time (off time) is dynamically optimized internally. After the off time has passed, when the PFM
comparator confirms the VOUT voltage has exceeded the set voltage, a signal that does not allow the Nch driver Tr to be turned on is sent from the
PFM comparator to the PFM control circuit, but if the VOUT voltage remains lower than the set voltage, then Nch driver Tr ON is started.
The intervals of the above ①②③ linked operations are continuously adjusted in response to the load current to ensure the output voltage is kept
stable from low to high loads and that it is done with good efficiency.
12/28

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