XC9501 Datasheet, PDF (1/24 Pages) Torex Semiconductor – 2ch. Step-up DC/DC Controller ICs.

XC9501 Series
2ch. Step-up DC/DC Controller ICs.
Mar. 17, 2003 Ver. 5
" 2ch DC/DC Controller (Step-up + Step-up)
" Input Voltage Range 0.9V ~ 10.0V
" Output Voltage Externally Set-Up
" Switching Frequency 180kHz (±15%)
" Max Duty Ratio 80% (TYP.)
" PWM, PWM/PFM Switching Control
" High Efficiency 83% (TYP.)
" MSOP-10 Package
! Applications
# PDAs
# Palm top computers
# Portable Audio Systems
# Various Multi-function Power Supplies
! Features
Input Voltage Range
:0.9V ~ 10V
Power Supply Voltage Range :2.0V ~ 10V
! General Description
The XC9501 series are PWM controlled, PWM/PFM automatic
switching controlled, multi-functional, dual step-up DC/DC
converter controller ICs.
With 0.9V (±2%) of standard voltage supply internal, and using
externally connected components, output voltage can be set
freely on both DC/DC controllers between 1.5V to 30V.
With a 180kHz frequency, the size of the external components
can be reduced. 300kHz and 500kHz switching frequencies
are also available as custom-designed products.
The control of the XC9501 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 to large output currents.
Noise is easily reduced with PWM control since the switching
frequency is fixed.
The XC9501 series provides the option of being able to select
the control suited to the application.
Soft-start time is internally set to 10msec which offers
protection against rush currents when the power is switched on
and also against voltage overshoot.
Output Voltage Range
Switching Frequency
Output Current
Stand-by Current
Soft-start internally set-up
MSOP-10 Package
:1.5V ~ 30V
Can be set freely with 0.9V(±
2.0%) of reference voltage
supply & external components.
:180kHz ±15%
:300kHz & 500kHz available as custom
:more than 200mA(VIN=1.8V, VOUT=3.3V)
:3.0µA (MAX)
! Typical Performance Characteristics
Efficiency vs. Output Current
XC9501B092A (180kHz,3.3V)
L1=22µH(CDRH5D28), CL1=47µF(Tantalum)
SD1:MA2Q737, Tr1:XP161A1355P
100
90
PWM/PFM Switching Control
80
70
60
50
VIN=1.8V _2.4V
40
30
PWM Control
20
10
0
0.1
1
10
100
1000
! Typical Application
( XC9501B092A Input: 2 cells, Output 1: 3.3V, Output 2: 5.0V )
Output Current 1 IOUT1 (mA)
VOUT1=3.3V
IOUT1=~200mA
SD1
:MA2Q737
L1:22uH
CDRH5D28
VIN
Tr1:Nch
=1.8V~3.2V
MOSFETXP161A1355P
CIN
:47µF
L2:22µH
CDRH5D28
SD2
:MA2Q737
Tr2:Nch MOSFET
XP161A1355P
VOUT2=5.0V
IOUT2=~100mA
RFB11 CFB1
:200kΩ :62pF
+
CL1 47?µF
RFB12
:75kΩ
VPWM1
VEN1
1 EXT1
2 VDD
3 FB1
4 PWM1
5 EN1
EXT2 10
GND 9
FB2 8
PWM2 7
EN2 6
CFB2
:160pF
VPWM2
VEN2
RFB21
:82kΩ
+
47µF CL2
RFB22
:18kΩ
1