XC9213_1 Datasheet, PDF (1/33 Pages) Torex Semiconductor – Synchronous Bootstrap N-ch & N-ch Driver

◆Synchronous Bootstrap N-ch & N-ch Driver
◆Input Voltage Range :4.0V ~ 25.0V
◆Oscillation Frequency :300kHz (accuracy±15%)
◆High Efficiency
:93% (TYP.)
◆PWM / PFM Manual Switching Control
◆Overcurrent Protection Circuit Built-In
◆TSSOP-16 package
■APPLICATIONS
☆GO-Compatible
May 23, 2005 V7
●PDAs
●Mobile phones
●Note book computers
●Portable audio systems
●Various multi-function power supplies
■GENERAL DESCRIPTION
The XC9213 series is N-ch ＆ N-ch drive, synchronous,
step-down DC/DC controller IC with a built-in bootstrap
driver circuit. Output will be stable no matter which load
capacitors, including low ESR capacitors, are used.
Resistance (RSENSE) of about several 10m Ω 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±2%) of internal reference
voltage by using externally connected resistors (RFB1, 2).
Synchronous rectification PWM control can be switched to
non-synchronous 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 4.0μA or less.
■TYPICAL APPLICATION CIRCUIT
■FEATURES
Input Voltage Range :4.0V ~ 25.0V
Output Voltage Range :1.5V ~ 15.0V externally set
Reference voltage : 1.0V (±2%)
Oscillation Frequency :300kHz (±15%)
Output Current
:More than 5A (VIN=5.0V, VOUT=3.3V)
Control
:PWM/PFM manual -switching control
Current Limiter, Protection :Current limit operates at voltage
sense 170mV (TYP.). Shutdown
High Efficiency
time can be adjusted by CPRO.
:93% [TYP. PWM Mode @ VIN=5.0V,
VOUT = 3.3V, IOUT=1A]
Detect Voltage Function :Detects 0.9V / Open-drain output
Stand-by Current
:ISTB = 4.0μA (MAX.)
Load Capacitor
:Low ESR capacitor compatible
Package
:TSSOP-16
■TYPICAL PERFORMANCE
CHARACTERISTICS
SD2
RSENSE
VIN VSENSE BST
VIN CIN
VDIN
VDOUT
VDIN
VDOUT
XC9213
VL
EXT1
LX
CVL
CSS
CSS
CPRO
FB
EXT2
AGND MODE CE PGND
CPRO
CBST
Tr1
L
SD1
CFB
Tr2
VOUT
RFB1
CL
RFB2
Data Sheet
1
ud200528