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XC9272 Datasheet PDF - Torex

Part Number XC9272
Description Ultra Low Quiescent Current Synchronous Step-Down PFM DC/DC Converter
Manufacturers Torex 
Logo Torex Logo 



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XC9272 datasheet, circuit
XC9272 Series
ETR05057-001
Ultra Low Quiescent Current Synchronous Step-Down PFM DC/DC Converter for Low Output Voltage
GENERAL DESCRIPTION
GreenOperation compatible
XC9272 series are Ultra Low Quiescent Current synchronous-rectification for Low Output Voltage type PFM step down DC/DC
converters with a built-in 0.4(TYP.) Pch driver and 0.4(TYP.) Nch synchronous switching transistor, designed to allow the
use of ceramic capacitor.
PFM control enables a low quiescent current, making these products ideal for battery operated devices that require high
efficiency and long battery life.
Only inductor, CIN and CL capacitors are needed as external parts to make a step down DC/DC circuit.
Operation voltage range is from 2.0V to 6.0V. This product has fixed output voltage from 0.6V to 0.95V(accuracy: ±20mV) in
increments of 0.05V.
During stand-by, all circuits are shutdown to reduce consumption to as low as 0.1μA(TYP.) or less.
With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when
input voltage gets lower than UVLO detection voltage. Besides, XC9272 series has UVLO release voltage of 1.8V (Typ.).
The product with CL discharge function, XC9272B type, can discharge CL capacitor during stand-by mode due to the internal
resistance by turning on the internal switch between VOUT -GND. This enables output voltage restored to GND level fast.
APPLICATIONS
Electric devices with GPS
Wearable devices
Energy Harvest devices
Backup power supply circuits
Devices with 1 Lithium cell
FEATURES
Input Voltage Range
Output Voltage Setting
Output Current
Driver Transistor
Supply Current
Control Method
: 2.0V~6.0V
: 0.6V~0.95V (±20mV, 0.05V step increments)
: 50mA
: 0.4(Pch Driver Tr)
0.4(Nch Synchronous rectifier Switch Tr)
: 0.50μA @ VOUT(T)=0.7V (TYP.)
: PFM control
High Speed Transient
PFM Switching Current
Function
: 50mV (VIN=3.6V, VOUT=0.7V, IOUT=10μA50mA)
: 180mA
: Short Protection function
CL Discharge(XC9272B type)
UVLO function
Ceramic Capacitor Compatible
Operation Ambient Temperature : -40+85
Package
: SOT-25, USP-6EL
Environmentally Friendly : EU RoHS compliant, Pb Free
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current
VIN
L
VIN LX
VOUT
XC9272A071xR-G(VOUT=0.7V)
L= 10μ H(VLF302512M -100M ),CIN =10μ F( LM K107 BJ10 6M A),
CL=22μF(JMK107BJ226MA)
100
VIN=2.0V
80
CIN
(Ceramic)
CE VOUT
GND
CL
(Ceramic)
60
VIN=3.6V
40
20
0
0.01
0.1 1
10
Output Current : IOUT (mA)
100
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XC9272 equivalent
XC9140 (Design Target)
ELECTRICAL CHARACTERISTICS (Continued)
XC9272B Type, with CL discharge function
PARAMETER
SYMBOL
CONDITIONS
Input Voltage
Output Voltage
UVLO Release Voltage
UVLO Hysteresis Voltage
VIN
V (*2)
OUT(E)
VUVLO(E)
VHYS(E)
-
Resistor connected with LX pin.
Voltage which LX pin changes “L” to “H” level
while VOUT is decreasing.
VCE=VIN, VOUT=0V. Resistor connected with LX pin.
Voltage which LX pin changes “L” to “H” level
while VIN is increasing.
VCE=VIN, VOUT=0V. Resistor connected with LX pin.
VUVLO(E) - Voltage which LX pin changes “H” to “L”
level while VIN is decreasing.
MIN.
2.0
1.65
0.1
TYP.
-
E1
1.8
0.15
XC9272
Series
MAX.
6.0
UNITS
V
CIRCUIT
V
1.95 V
0.23 V
Supply Current
Iq VIN=VCE=2.0V, VOUT=VOUT(T)+0.5V (*1), LX=Open.
- 0.5 0.8 μA
Standby Current
ISTB VIN=5.0V, VCE=VOUT=0V, LX=Open.
- 0.1 1.0 μA
LX SW “H” Leak Current
ILEAKH
VIN=5.0V, VCE=VOUT=0V, VLX=0V.
- 0.1 1.0 μA
LX SW “L” Leak Current
ILEAKL
VIN=5.0V, VCE=VOUT=0V, VLX=5.0V.
- 0.1 1.0 μA
PFM Switching Current
IPFM
VIN=VCE=VOUT(T)+2.0V (*1), IOUT=10mA.
115 180 250 mA
Efficiency (*3)
EFFI
VIN=VCE=3.6V,
VOUT(T)=0.7V (*1), IOUT=30mA.
- 85 - %
LX SW “Pch”
ON Resistance (*4)
RLXP
VIN=VCE=5.0V, VOUT=0V, ILX=50mA.
-
0.4 0.65
LX SW “Nch”
ON Resistance
RLXN
VIN=VCE=5.0V.
- 0.4 (*5) -
Output Voltage
Temperature
Characteristics
ΔVOUT/
-40℃≦Topr85.
(VOUT・ΔTopr)
- ±100
- ppm/
CE “High” Voltage
VOUT=0V. Resistor connected with LX pin.
VCEH
Voltage which LX pin changes “L” to “H” level while 1.2
-
6.0
V
VCE=0.21.5V.
CE “Low” Voltage
VOUT=0V. Resistor connected with LX pin.
VCEL Voltage which LX pin changes “H” to “L” level while GND
-
0.3
V
VCE=1.50.2V.
CE “High” Current
ICEH VIN=VCE=5.0V, VOUT=0V, LX=Open.
-0.1 - 0.1 μA
CE “Low” Current
ICEL VIN=5.0V, VCE=VOUT=0V, LX=Open.
-0.1 - 0.1 μA
Short Protection
Threshold Voltage
Resistor connected with LX pin.
VSHORT
Voltage which LX pin changes “H” to “L” level while 0.14
0.3
0.48
VOUT= VOUT(T)+0.1V0V(*1).
V
CL Discharge
RDCHG
VIN=VOUT=5.0V, VCE=0V, LX=Open.
55 80 105
Unless otherwise stated, VIN=VCE=5.0V
(*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 = (VIN – VLX pin measurement voltage) / 50mA
(*5) Designed value
-
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Information Total 23 Pages
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