XC9503 Datasheet, PDF (1/30 Pages) Torex Semiconductor – 2ch Step-down DC/DC Controller ICs

XC9503 Series
2ch. Step-down DC/DC Controller ICs
Mar. 14, 2003 Ver. 2
‹ 2ch DC/DC Controller (Step-down + Step-down)
‹ Input Voltage Range 2.0V ~ 10.0V
‹ Output Voltage Externally Set-Up
‹ Switching Frequency 300kHz (±15%)
‹ Maximum Duty Cycle 100%
‹ PWM, PWM/PFM Switching Control
‹ High Efficiency
Step-down 92% (Typ.)
‹ Small MSOP-10 package
„ Applications
z PDAs
z Palm Top Computers
z Digital Cameras
z Various Multi-Function Power Supplies
„ Features
Input Voltage Range
: 2.0V ~ 10V
Power Supply Voltage Range : 2.0V ~ 10V
„ General Description
The XC9503 series are PWM controlled, PWM/PFM automatic
switching controlled, multi-functional, 2 channel step-down
DC/DC controller ICs. Since the series has a built-in 0.9V
reference voltage (accuracy ±2%), 0.9V to 6.0V can be set
using external components. With a 300kHz frequency, the size
of the external components can be reduced. Switching
frequencies of 180kHz & 500kHz are also available as custom-
designed products.
The control of the XC9503 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.
Output Voltage Range
Oscillation Frequency
Output Current
Stand-By Function
Package
Soft-Start Time
: 0.9V ~ 6.0V
Can be set freely with 0.9V
(±2.0%) of reference
voltage supply and
external components.
: 300kHz
±15%
(180kHz, 500kHz custom)
: more than 1000mA (VIN=5.0V, VOUT=3.3V)
: 3.0µA (MAX.)
: MSOP-10
: 10 ms (internally set)
„ Typical Performance Characteristics
XC9503B093A (300kHz,VOUT1:3.3V)
Noise is easily reduced with PWM control since the frequency
is fixed. The series gives freedom to select control suited to
the application. Soft-start time is internally set to 10msec and
offers protection against in-rush currents when the power is
switched on and also protects against voltage overshoot.
100
90
L1=22µH(CDRH5D28), CL1=47µF(Tantalum)
SD1:MA2Q737, Tr1:XP162A1355P
PWM/PFM Switching
80
70
60
VIN=5.0V
50
40
30
20
„ Typical Application Circuit
XC9503B093A Input :
VOUT1 : 3.3V, VOUT2 : 1.8V
10
0
0.1
PWM
1
10
100
Output Current 1 IOUT1(mA)
1000
VOUT1:3.3V
L1:22µH
CDRH5D28
Tr1:Pch MOSFET
XP162A12A6P
SD1
:MA2Q737
RFB11
:200kΩ
CFB1
:62pF
VIN
=5.0V
Tr2:Pch MOSFET
XP162A12A6P
L2:22µH
CDRH5D28
CIN
:47µF
SD2
:MA2Q737
VOUT2:1.8V
CFB2
:62pF
RFB21
:220kΩ
CL1:
47µFX2
RFB12
:75kΩ
VPWM1
VEN1
1 EXT1/ EXT2/ 10
2 VDD
GND 9
3 FB1
FB2 8
4 PWM1 PWM2 7
5 EN1
EN2 6
VPW M2
VEN2
CL2:
47µFX2
RFB22
:220kΩ
1