XC9213 Series
Preliminary
!
!
!
!
!
!
!
!
Synchronous, Bootstrap
Nch-Nch Drive
Input Voltage Range
: 2.5V ~ 25.0V
Switching Frequency
: 300kHz (鹵15%)
PWM/PFM Manual Switching Control
Overcurrent Protection Circuit Built-In
High Efficiency
: 93% (TYP.)
TSSOP-16 Package
Ceramic Capacitor Compatible
Driver Transistor Built-In
Synchronous Step-Down DC/DC Controller Ics
Input Voltage : 25V
May 20, 2003 Ver. 1
"
APPLICATIONS
#
PDAs
#
Mobile Phones
#
Note book computers
#
Portable Audio Systems
#
Various Multi-function Power Supplies
"
GENERAL DESCRIPTION
XC9213 series is Nch-Nch drive, synchronous, step-down DC/DC
controller ICs with a built-in bootstrap driver circuit. Output will be
stable no matter which load capacitors, including a low ESR
capacitor, are used.
Resistance (RSENSE) of about 100m鈩?will be required as a current
sense. The phase compensation is also run when a low ESR
capacitor is used. In addition, the circuit is double protected by the
ways of limiting the current while detecting overshoot current and
making output shutdown at any given timing by a protection time
setting capacitor (CPRO).
The output voltage can be set freely within a range of 1.5V~15.0V
with 1.0V (accuracy
鹵1.5%)
of internal reference voltage by using
externally connected resistors (RFB1, 2). Synchronous rectification
PWM control can be switched to non-synchronous 30mV current
limit PFM/PWM automatic switchable control (= voltage between
RSENSE pins) by using the MODE pin.
The series has a built-in voltage detector for monitoring a selected
voltage by external resistors.
During stand-by (CE pin = low) all circuits are shutdown to reduce
current consumption to as low as 3.0碌A(chǔ) or less.
"
FEATURES
Input Voltage Range
Output Voltage Range
: 2.5V ~ 25.0V
: 1.5V ~ 15.0V externally set
Reference voltage : 1.0V (鹵1.5%)
Oscillation Frequency
Output Current
Control
Current Limiter, Protection
: 300kHz (鹵15%)
: More than 5A (V
IN
=5.0V, V
OUT
=3.3V)
: PWM/PFM manual-switching control.
: Current limit operates at voltage
sense 150mV.
Shutdown time can be adjusted
by CPRO.
High Efficiency
: 93% (TYP., PWM mode @ VIN=5.0V,
VOUT = 3.3V, 1A)
Detect Voltage Function
Stand-by Current
Load Capacitor
: Detects 0.9V / Open-drain output
: ISTB = 3.0碌A(chǔ) (MAX.)
: Low ESR (ceramic, etc.)
capacitor compatible
Package
: TSSOP-16
"
TYPICAL APPLICATION CIRCUIT
"
TYPICAL PERFORMANCE CHARACTERISTICS
XC9213B103V (FOSC:300kHz,3.0V)
VIN : 5.0V, Tr1,Tr2: IRF7313,
L : 6.1uH (CDRH127-6H1), Cout : 150uF (OS)
S D2
100
Efficiency EFFI (%)
RS ENS E
VIN
VS E NS E BST
EXT1
VDi n
Lx
V Do ut
CB ST
N1
80
60
40
20
0
0.01
0.1
1
Output Current IOUT (A)
10
PWM
Synchronous Rectification
PWM / PFM
Non Synchronous Rectification
V Di n
VIN
CIN
V Dou t
L
VOUT
CFB
XC9213
VL
CV L
CS S
CSS
CPRO
CP RO AGND M ODE
CE
FB
EXT2
PGND
N2
(
)
S D1
RFB 1
CL
RFB 2
1
1
2
3
4
5
