2ch. Step-Down / Inverting DC/DC Controller ICs
XC9505 Series
May 29, 2003 Ver 4
! Applications
" 2ch DC/DC Controller (Step-Down + Inverting)
" Input Voltage Range 2.0V ~ 10.0V
" Output Voltage Externally Set-Up
# PDAs
# Palm Top Computers
# Portable Audio Systems
# Various Multi-function Power Supplies
" Oscillation Frequency 180kHz (±15%)
" Max Duty Ratio
Step-Down : 100%
Inverting : 80% (Typ.)
" PWM, PWM/PFM Switching Control
" MSOP-10 Package
! Features
2ch. DC/DC Controllers
Output 1: Step-Down DC/DC Controller
Output 2: Inverting DC/DC Controller
Power Supply Voltage Range 2.0V ~ 10V
Output Voltage Range
Output 1:
0.9V ~ 6.0V
! General Description
The XC9505 series are PWM control, PWM/PFM switching, 2
channel (step-down and inverting) DC/DC controller ICs.
With 0.9V of standard voltage supply internal, and using
externally connected components, the output 1 voltage (step-
down DC/DC controller) can be set freely within a range of 0.9V
~ 6.0V. Since output 2 (inverting DC/DC controller) has a
built-in 0.9V reference voltage (accuracy ±2), a negative voltage
can be set with the external components.
(Step-Down DC/DC Controller)
Can be set freely with 0.9V(±
2.0%) of reference voltage
supply & external components
Output 2:
-30V ~ 0V
Can be set freely with 0.9V(±
2.0%) of reference voltage &
external components
(Inverting DC/DC Controller)
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 XC9505 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.
Oscillation Frequency
180kHz ±15%
300kHz & 500kHz are available as custom
Output Current
Output 1 :more than 1000mA (VIN=5.0V,VOUT=3.3V)
Output 2 :more than - 100mA (VIN=5.0V,VOUT=- 7.5V)
Soft-Start Internally Set-Up (Output 1)
Stand-By Current
3.0µA (MAX)
! Typical Perfomance Characteristics
XC9505B092A (180kHz,VOUT1:3.3V,VOUT2:-7.5V)
Tr1,Tr2:XP162A12A6P, CL1, CL2=92uF(Tantalum),SD1:CMS02
The series gives freedom of control selection so that control
suited to the application can be selected.
SD2:MA2Q737,L1=47uH(CDRH6D28),L2=22uH(CDRH5D28)
Soft-start time is internally set to 10msec (output 1)
100
90
PWM/PFM Switching Control
80
70
60
which offers protection against rush currents and voltage
overshoot when the power is switched on .
VOUT2:-7.5V
50
VOUT1:3.3V
40
30
20
PWM Control
10
0
VIN=5.0V
0.1
1
10
100
1000
Output Current 1,2 IOUT1,2 (mA)
! Typical Application
( XC9505B092A Input: 2 Cell, Output 1: 3.3V, Output 2: -7.5V )
L1:22uH
CDRH5D28
SD2
:MA2Q737
Tr2:Pch MOSFET
XP162A12A6P
Tr1:Pch MOSFET
XP162A12A6P
VOUT2 :-7.5V
VOUT1 :3.3V
CIN
:47uF
VIN
=5.0V
SD1
:MA2Q737
L2:22uH
CDRH5D28
CL2:47uF
CF B1
:62pF
RF B11
:2 00k Ω
CF B1
:88pF
RF B21
:150 kΩ
1EXT1/ EXT2/10
2VDD
3FB1
GND 9
FB2 8
CL1:47uF
VPWM 1
VEN 1
4PWM1 PWM27
5EN1 EN26
VPWM 2
VEN 2
RF B12
RF B22
:75k Ω
:43 kΩ
1