XC9103_1 Datasheet, PDF (1/23 Pages) Torex Semiconductor – Ceramic Capacitor Compatible, Step-up DC/DC Controllers

XC9103/XC9104/XC9105 Series
Ceramic Capacitor Compatible, Step-up DC/DC Controllers
ETR0404_003
ç
ˑGreenOperation Compatible
˙GENERAL DESCRIPTION ^ç
ç _{The XC9103/XC9104/XC9105 series are PWM, PWM/PFM auto switching /manual switching controlled universal step-up}
ç _{DC/DC converter controllers.}
ç Output will be stable no matter which load capacitors are used but should a low ESR capacitor be used, RSENSE of about 0.1Њ
ç ^{will be required and phase compensation will be achieved. This allows the use of ceramic capacitors and enables to obtain lower}
ç
output ripple and
unnecessary.
small
PCB
design.
Tantalum
and
electrolytic
capacitors
can
also
be
used,
in
which
case,
RSENSE
becomes
With 0.9V internal voltage reference and by using externally connected two resistors, output voltage can be set freely within a
range of 1.5V to 30V. The series is available in 300 kHz and 180 kHz frequencies, the size of the external components can be
reduced. 100 kHz and 500 kHz are also available in custom options.
The XC9103 offers PWM operation. The XC9104 offers PWM/PFM automatic switching operation. The PWM operation is shifted to
the PFM operation automatically at light load so that it maintains high efficiency over a wide range of load currents. The XC9105
offers both PWM and PWM/PFM auto switching operations and it can be selected by external signal.
A current limiter circuit is built-in to the IC (except with the 500 kHz version) and monitors the ripple voltage on the FB pin.
Operation is shut down when the ripple voltage is more than 250mV. The operations of the IC can be returned to normal with
a toggle of the CE pin or by turning the power supply back on.
˙APPLICATIONS
˔PDAs
˔Cellular phones
˔Palmtop computers
˔Portable audio systems
˔Various multi-function power supplies
˙FEATURES
Input Voltage Range : 0.9V ~ 10V
Supply Voltage Range : 1.8V ~ 10V
Output Voltage Range : 1.5V ~ 30V
Set freely with the reference voltage
0.9V(ʶ2.0%) and two resistors
Oscillation Frequency : 100, 180, 300, 500kHz (ʶ15%)
180, 300kHz only for XC9103/04/05B
type (with current limiter)
Output Current
: more than 400mA
(VIN=1.8V, VOUT=3.3V)
Controls
: PWM (XC9103)
PWM/PFM auto-switching (XC9104)
PWM/PFM manual switching
(XC9105)
High Efficiency
: 85% (TYP.)
Stand-by Current
Load Capacitors
: I_STB=1.0ЖA (MAX.)
: Low ESR capacitors compatible
Current
: Operates when
Limiter Function
ripple voltage=250mV
Also available without current limiter
(100kHz and 500kHz types are
available only without current limiter)
Package
: SOT-25, USP-6B
˙TYPICAL APPLICATION CIRCUIT ˙çTYPICAL PERFORMANCE
CHARACTERISTICS
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