XC9502_1 Datasheet, PDF (1/43 Pages) Torex Semiconductor – 2ch. Step-up / down DC/DC Controller ICs

XC9502 Series
2ch.Step-Up/Down DC/DC Controller ICs
ETR0702_001
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ˑGO-Compatible
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ç _{˙çGENERAL DESCRIPTION}
ç _Xç_{C9502 series is PWM controlled, PWM/PFM automatic switching controlled, multi-functional, 2 channel step-up and down}
ç _{DC/DC controller ICs. With 0.9V of standard voltage supply internal, and using externally connected components, the output}
1 voltage (step-up DC/DC controller) can be set freely within a range of 1.5V to 30V. Since the output 2 (step-down DC/DC
controller) has a built-in 0.9V reference voltage (accuracy ʶ2%), 0.9V to 6.0V can be set using external components. With
a 180kHz frequency, the size of the external components can be reduced. Switching frequencies of 300kHz and 500kHz are
also available as custom-designed products. The control of the XC9502 series can be switched between PWM control and
PWM/PFM automatic switching control using external signals. Control switches from PWM to PFM during light loads when
automatic switching is selected and the series is highly efficient from light loads through to large output currents. Noise is
easily reduced with PWM control since the frequency is fixed. The series gives freedom of control selection so that control
suited to the application can be selected. Soft-start time is internally set to 10msec (Output1) and offers protection against
in-rush currents when the power is switched. This also prevents voltage overshoot.
˙APPLICATIONS
˔PDAs
˔Palmtop computers
˔Portable audio
˔Various power supplies
˙FEATURES
2ch DC/DC Controller
<Output 1: Step-Up DC/DC Controller>
Output Voltage Range : 1.5V ~ 30V (set by FB1 pin)
Output Current
: More than 300mA
(VIN=1.8V,VOUT=3.3V)
Maximum Duty Cycle : 80% (TYP.)
High Efficiency
: 83% (TYP.)
<Output 2: Step-Down DC/DC Controller>
Output Voltage Range : 0.9V ~ 6.0V (set by FB2 pin)
Output Current
: ʽ1000mA (VIN=3.3V, VOUT=1.8V)
Maximu Duty Cycle : 100% (TYP.)
High Efficiency
: 92% (TYP.)
˙TYPICAL APPLICATION CIRCUIT
<Common>
Supply Voltage Range
Input Voltage Range
Oscillation Frequency
Control Method
Stand-by Function
Soft-Start Time
Package
: 2.0V ~ 10.0V
: 0.9V ~ 10.0V
: 180kHz (ʶ15%)
* 300kHz, 500kHz custom
: PWM or PWM/PFM selectable
: 3.0ЖF (MAX.)
: 10ms (internally set)
: MSOP-10, USP-10
˙TYPICAL PERFORMANCE
CHARACTERISTICS
<XC9502B092A Input : 2 cell, VOUTᶃ: 3.3V, VOUTᶄ: 1.8V >
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