XC9210_1 Datasheet, PDF (1/12 Pages) Torex Semiconductor – Synchronous Step-Down DC / DC Controller ICs

XC9210 Series
Synchronous Step-Down DC / DC Controller ICs
ETR0504_001
☆GO-Compatible
■GENERAL DESCRIPTION
The XC9210 is a synchronous PWM, PWM/PFM controller designed for low voltage step-down DC/DC converter applications.
High efficiency is obtained through the use of a synchronous rectification topology. Efficiencies are maximized by using the low
RDSon N-Channel MOSFET switch which replaces the catch diode used in standard buck circuits.
The operation of the XC9210 series can be switched between PWM and PWM/PFM externally using the MODE pin. In
PWM/PFM mode the XC9210 automatically switches from PWM to PFM during light loads and high efficiencies can be
achieved over a wide range of load conditions.
Output noise is reduced in PWM operation as the frequency is fixed.
The XC9210 has an 0.9V (±2.0%) internal voltage, and using externally connected components, the output voltage can be set freely
between 0.9V to 6.0V. With an internal switching frequency of 300kHz and 180kHz (custom) smaller, low cost external
components can also be used.
Soft-start time is internally set to 10msec offering protection against in-rush currents during start-up and preventing voltage overshoot.
■APPLICATIONS
●PDAs
●Palmtop computers
●Portable audios
●Various power supplies
■FEATURES
Input Voltage Range
: 2.0V ~ 10V
Output Voltage Range
: 0.9V ~ 6.0V
Can be set freely with 0.9V
(±2.0%) of reference
Oscillation Frequency
: 300kHz ±15%
(180kHz as custom)
Output Current
: More than 2A
(VIN = 5.0V, VOUT=3.3V)
Stand-By Function
: 3.0μA (MAX.)
Soft-start internally set-up : 10 ms (internally set-up)
Synchronous Step-Down DC/DC Controllers
Maximum Duty Cycle
: 100% (TYP.)
PWM and PWM/PFM Externally Selectable
Synchronous Rectification Control
High Efficiency
: 95% (TYP.)
Package
: MSOP-8A
■TYPICAL APPLICATION CIRCUIT
<XC9210B093K OUTPUT=3.3V>
■TYPICAL PERFORMANCE
CHARACERISTICS
Efficiency vs. Output Current
Tr1:Pch MOSFET
:CPH3308
PWM
CE
VIN:3.3V~10V
CIN:47μF
EXT1
VDD
PWM
CE
L:22μH
CDRH125
Tr2:Nch MOSFET
:CPH3408
VOUT:3.3V
EXT2
GND
FB
MODE
CFB
:62pF
RFB1
:200kΩ
CL:
47μFX2
MODE
RFB
:75kΩ
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