XC9272 Datasheet, PDF (1/23 Pages) Torex Semiconductor – 0.6V~0.95V (±20mV, 0.05V step increments)

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 0.4Ω (TYP.) Pch driver and 0.4Ω (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
: 2.0V~6.0V
Output Voltage Setting
: 0.6V~0.95V (±20mV, 0.05V step increments)
Output Current
: 50mA
Driver Transistor
: 0.4Ω (Pch Driver Tr)
0.4Ω (Nch Synchronous rectifier Switch Tr)
Supply Current
: 0.50μA @ VOUT(T)=0.7V (TYP.)
Control Method
: PFM control
High Speed Transient
PFM Switching Current
: 50mV (VIN=3.6V, VOUT=0.7V, IOUT=10μA→50mA)
: 180mA
Function
: 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
VIN
CIN
(Ceramic)
L
VIN
LX
CE
VOUT
GND
VOUT
CL
(Ceramic)
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency vs. Output Current
XC9272A071xR-G(V_OUT=0.7V)
L= 10μ H(VLF302512M -100M ),CIN =10μ F( LM K107 BJ10 6M A),
CL=22μF(JMK107BJ226MA)
100
VIN=2.0V
80
60
VIN=3.6V
40
20
0
0.01
0.1
1
10
100
Output Current : IOUT (mA)
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