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參數(shù)資料
| 型號： | XC9511_1 |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| 中文描述： | 同步降壓型DC / DC轉(zhuǎn)換器內(nèi)置LDO的同時加電壓檢測器調(diào)節(jié)器 |
| 文件頁數(shù)： | 1/35頁 |
| 文件大?。?/td> | 3471K |
| 代理商： | XC9511_1 |
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XC9511
Series
1/35
Synchronous Step-Down DC/DC Converter
with Built-In LDO Regulator In Parallel Plus Voltage Detector
■
GENERAL DESCRIPTION
The XC9511 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in parallel with the
DC/DC converter's output. A voltage detector is also built-in. Since the input for the LDO voltage regulator block comes
from the input power supply, it is suited for use with various applications.
The DC/DC converter block incorporates a P-channel driver transistor and a synchronous N-channel switching transistor.
With an external coil, diode and two capacitors, the XC9511 can deliver output currents up to 800mA at efficiencies over 90%.
The XC9511 is designed for use with small ceramic capacitors.
A choice of three switching frequencies are available, 300 kHz, 600 kHz, and 1.2 MHz. Output voltage settings for the DC/DC
and VR are set-up internally in 100mV steps within the range of 0.9V to 4.0V (
±
2.0%). For the VD, the range is of 0.9V to
5.0V (
±
2.0%). The soft start time of the series is internally set to 5ms. With the built-in U.V.L.O. (Under Voltage Lock Out)
function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4 V or lower.
■
APPLICATIONS
●
CD-R / RW, DVD
●
HDD
●
PDAs, portable communication modem
●
Palmtop computers
●
Cellular phones
●
Cameras, video recorders
■
TYPICAL APPLICATION CIRCUIT
■
FEATURES
DC/DC Converter with Built-in LDO and VD Function
Input Voltage Range
: 2.4V ~ 6.0V
Low ESR Capacitor
: Ceramic capacitor compatible
VD Function
: Three VD sensing Options for either
V
DD
, D
COUT
, or V
ROUT
Package
: SOP-8
<DC/DC Converter Block>
Output Voltage Range
: 0.9V ~ 4.0V (Accuracy
±
2%)
Output Current
: 800mA
Control Method
: PWM or PWM/PFM Selectable
Oscillation Frequency
: 300kHz, 600kHz, 1.2MHz
<Regulator Block>
Regulator Input
: Parallel Input to DC/DC converter
Output Voltage Range
: 0.9V ~ 4.0V (Accuracy
±
2%)
Current Limit
: 600mA
Dropout Voltage
: 160mV@I
OUT
=200mA (V
OUT
=2.8V)
High Ripple Rejection
: 60dB @1kHz (V
OUT
=2.8V)
■
TYPICAL PERFORMANCE
CHARACTERISTICS
XC9511Axxx
V
IN
=5.0V, Topr=25
o
C, L: 4.7
μ
H(CDRH4D28C)
C
IN
: 4.7
μ
F(ceramic), C
L
1: 10
μ
F(ceramic), C
L
2: 4.7
μ
F(ceramic)
* Please refer to the typical application circuit when
external components are selected.
SOP-8 (TOP VIEW)
ETR1008_001
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