XC9140 Datasheet, PDF (1/28 Pages) Torex Semiconductor – Step-Up Synchronous PFM DC/DC Converter

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 0.6Ω
(TYP.) Nch driver transistor and an internal 0.65Ω (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 V_IN = 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
: 100mAï¼ V_OUT=3.3V, V_BAT=1.8V (TYP.)
: 0.6Ω Nch driver transistor
0.65Ω Pch synchronous rectifier switch transistor
: 6.3μA (V_BAT=V_OUT+0.5V)
: PFM Control
: 50mV@V_OUT=3.3V, V_BAT=1.8V, I_OUT=1→50mA
: 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
C^CIN=IN1⁼0^4.μ^7μF^F
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),
CL=10μF(LMK107BJ106MA)
100
2.5V
80
60
3.0V
V_BAT=1.8V
40
20
0
0.01
0.1
1
10
100
Output Current : I_OUT (mA)
1000
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