XC9505 Datasheet, PDF (1/47 Pages) Torex Semiconductor – 2ch. Step-Down / Inverting DC/DC Controller ICs

XC9505 Series
2ch. Step-Down / Inverting DC/DC Controller ICs
May 29, 2003 Ver 4
" 2ch DC/DC Controller (Step-Down + Inverting)
" Input Voltage Range 2.0V ~ 10.0V
" Output Voltage Externally Set-Up
" Oscillation Frequency 180kHz (±15%)
" Max Duty Ratio Step-Down : 100%
Inverting : 80% (Typ.)
" PWM, PWM/PFM Switching Control
" MSOP-10 Package
! Applications
# PDAs
# Palm Top Computers
# Portable Audio Systems
# Various Multi-function Power Supplies
! 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
! 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.
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.
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)
which offers protection against rush currents and voltage
overshoot when the power is switched on .
Output Voltage Range
Output 1:
0.9V ~ 6.0V
(Step-Down DC/DC Controller) Can be set freely with 0.9V(±
2.0%) of reference voltage
supply & external components
Output 2:
(Inverting DC/DC Controller)
-30V ~ 0V
Can be set freely with 0.9V(±
2.0%) of reference voltage &
external components
Oscillation Frequency
180kHz ±15%
Output Current
300kHz & 500kHz are available as custom
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
SD2:MA2Q737,L1=47uH(CDRH6D28),L2=22uH(CDRH5D28)
100
90
PWM/PFM Switching Control
80
70
60
50
VOUT2:-7.5V
40
VOUT1:3.3V
30
20
PWM Control
10
0
VIN=5.0V
0.1
1
10
100
1000
! Typical Application
( XC9505B092A Input: 2 Cell, Output 1: 3.3V, Output 2: -7.5V )
Output Current 1,2 IOUT1,2 (mA)
V OUT1 : 3. 3V
L1:22uH
C D R H 5D 28
Tr1:Pch M OSFET
XP162A12A6P
Tr2:Pch M OSFET
XP162A12A6P
SD 2
:M A2Q737
V OUT2 :-7.5V
SD 1
:M A2Q737
RF B11 CFB1
:2 00k Ω :62pF
CL 1 :47uF
RF B 12
: 75k Ω
VPWM 1
V EN 1
V IN
= 5.0V
C IN
:47uF
1EXT 1/ EXT 2/10
2VDD
GND 9
3FB 1
FB2 8
4PW M1 P W M27
5EN1
E N2 6
L2:22uH
CDRH5D28 ^{CL 2 :47uF}
RF B21
:150 kΩ
CF B1
:88pF
VPWM 2
V EN 2
RF B22
:43 kΩ
1