XC9502 Datasheet, PDF (1/40 Pages) Torex Semiconductor – 2ch. Step-up / down DC/DC Controller ICs

XC9502 Series
2ch. Step-up / down DC/DC Controller ICs
Mar, 14 2003 Ver. 2
" 2ch DC/DC Controller (Step-up + Step-down)
" Input Voltage Range 0.9V ~ 10.0V
" Output Voltage Externally Set-Up
" Switching Frequency 180kHz (±15%)
" Maximum Duty Cycle Step-up 80% (Typ.)
! Applications
# PDAs
# Palm Top Computers
# Portable Audio Systems
# Various Multi-Function Power Supplies
Step-down 100%
" PWM, PWM/PFM Switching Control
" High Efficiency
Step-up 85% (Typ.)
! Features
2ch DC/DC Controller
Step-down 92% (Typ.)
" Small MSOP-10 package
Output 1 : Step-up DC/DC Controller
Output 2 : Step-down DC/DC Controller
Power Supply Voltage Range : 2.0V ~ 10V
Output Voltage Range
! General Description
The XC9502 series are PWM controlled, PWM/PFM automatic
switching controlled, multi-functional, 2 channel step-up and
down 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 ±2%), 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 & 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.
Output 1 (Step-up) : 1.5V ~ 30.0V
Can be set freely with 0.9V
(±2.0%) of reference voltage supply
and external components.
Output 2 (Step-down) : 0.9V ~ 6.0V
Can be set freely with 0.9V
(±2.0%) of reference voltage supply
and external components.
Oscillation Frequency
: 180kHz
±15%
(300kHz, 500kHz custom)
Output Current Output 1 : more than 300mA (VIN=1.8V, VOUT=3.3V)
Output 2 : more than 1000mA (VIN=3.3V, VOUT=1.8V)
Stand-By Function
: 3.0µA (MAX.)
Package
: MSOP-10
Soft-Start Time
: 10 ms (internally set)
! Typical Performance Characteristics
XC9502B093A (300kHz,VOUT1:3.3V,VOUT2:1.8V)
L1=15µH,L2=22µH(CDRH5D28),CL1,CL2=92µF(Tantalum)
SD1,SD2:CMS02, Tr1:XP161A1355P,Tr2:XP162A12A6P
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 (Output 1) and offers protection
against in-rush currents when the power is switched. This also
prevents voltage overshoot.
100
90
80
70
60
50
40
PWM/PFM Switching Control
VOUT1:3.3V
VOUT2:1.8V
30
! Typical Application Circuit
XC9502B092A Input :
2 cell, VOUT1 : 3.3V, VOUT2 : 1.8V
20
10
0
0.1
PWM Control
VIN=2.7V
1
10
100
Output Current 1,2 IOUT1,2 (mA)
1000
VOUT1:3.3V
SD1
:MA2Q737
L1:22µH
CDRH5D28
RFB11
:200kΩ
CL1
:47µFX2
CFB1
:62pF
Tr2:Nch
MOSFET
:XP161A1355P
RFB12
:75kΩ
VPW M1
VNE1
VIN
=2.0V
~3.0V
Tr2:Pch
MOSFET
XP162A12A6P
L2:22µH
CDRH5D28
CIN
:47µF
SD2
:MA2Q737
CFB2
:62pF
RFB21
:220kΩ
VOUT2:1.8V
1 EXT1 EXT2/ 10
2 VDD GND 9
3 FB1
FB2 8
4 PW M1 PW M2 7
5 EN1
EN2 6
VPW M2
VNE2
CL2
:47µFX2
RFB22
:220kΩ
1