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XC9245 Datasheet Preview

XC9245 Datasheet

Step-Down DC/DC Converter

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XC9244/XC9245 Series
ETR0520-006
400mA Synchronous Step-Down DC/DC Converters
˙GENERAL DESCRIPTION
ˑGreenOperation Compatible
The XC9244/XC9245 series is a group of synchronous-rectification type step-down DC/DC converters with a built-in
0.65Њ P-channel MOS driver transistor and 0.45Њ N-channel MOS switching transistor, designed to allow the use of
ceramic capacitors. Output current of 400mA (MAX.) to be configured using only a coil and capacitor connected externally.
The output voltage can be set from 0.8V to 4.0V in increments of 0.05V (accuracy: ±2.0%). With an internal switching
frequency of 1.2MHz, small external components can be used. USPN-6 package is suitable for the application which
requires low profile and small-footprint.
The XC9244 series is PWM fixed frequency control, and the XC9245 series is PWM/PFM, which automatically switches
from PWM to PFM during light loads, high efficiency can be achieved over a wide range of load conditions. When
stand-by mode, due to stop all operation, supply current is reduced to 1ЖA or less. The integrated CL discharge function
which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located
between the VOUT and VSS pins. The CL discharge function prevents malfunction on VOUT connecting application during
stand-by mode.
The XC9244/XC9245 series has a high speed soft-start as fast as 0.25ms in typical for quick turn-on. Current limiter
circuit (Constant Current & Latching) is built-in for preventing from thermal destruction. With UVLO (Under Voltage Lock
Out) function, the internal P channel driver transistor is forced OFF when input voltage becomes 2.25V or lower.
˙APPLICATIONS
˔Smart phones / Mobile phones
˔Bluetooth
˔Mobile devices / terminals
˔Portable game consoles
˔Digital still cameras / Camcorders
˔Note PCs / Tablet PCs
˙FEATURES
Driver Transistor Built-In
: 0.65Њ P-ch Driver Transistor

0.45Њ N-ch Synchronous Switch Transistor
Input Voltage
: 2.3V ~ 6.0V
Output Voltage Selectable
High Efficiency
: 0.8V ~ 4.0V (0.05V Increments)
: 90% (TYP.)ˎ
Output Current
: 400mA
Oscillation Frequency
: 1.2MHz ±15%
Maximum Duty Cycle
Function


: 100%
: Current Limiter Circuit
(Constant Current & Latching)
CL High Speed Discharge
Soft Start Circuit
Capacitor
: Low ESR Ceramic Capacitor
Control Methods
: PWM (XC9244)

PWM/PFM Auto (XC9245)
Operating Ambient Temperature
Package
: -40ˆʙ+85ˆ
: USPN-6
Environmentally Friendly  
: EU RoHS Compliant, Pb Free
* The characteristics change with external parts, substrate wiring, etc.
˙TYPICAL APPLICATION CIRCUIT
-
7065
7*/
N"
7*/
-Y
˙TYPICAL PERFORMANCE
CHARACTERISTICS
XC9244/XC9245A33C
CIN=4.7μF(LMK212BJ475)
100 L=4.7μH(SPM3012),CL=10μF(LMK212BJ106)
$*/
DFSBNJD
$&
$&
7065
744
$-
DFSBNJD
80
60
VIN=4.2V
40 VIN=5.0V
20
PWM Control
VIN=4.2V
5.0V
0
0.1
1
10
100
1000
Output Current : IOUT (mA)
1/24




Torex

XC9245 Datasheet Preview

XC9245 Datasheet

Step-Down DC/DC Converter

No Preview Available !

XC9244/XC9245 Series
˙BLOCK DIAGRAM
XC9244/XC9245 Series, Type A
˙PRODUCT CLASSIFICATION
˔Ordering Information
XC9244ᶃᶄᶅᶆᶇᶈ-Fixed PWM control
XC9245ᶃᶄᶅᶆᶇᶈ-PWM / PFM automatic switching control
DESIGNATOR
ITEM
SYMBOL
DESCRIPTION
Type
A
Refer to Selection Guide
Output voltage options
e.g. 1.2V =1, =2
ᶄᶅ
Output Voltage
08ʙ40
1.25V =1, =C
0.05V increments: 0.05=A, 0.15=B, 0.25=C, 0.35=D, 0.45=E,
          0.55=F, 0.65=H, 0.75=K, 0.85=L, 0.95=M
Refer to “Stadard Voltage”
ᶇᶈ-(*1)
Oscillation
Frequency
Package (Order Unit)
C
7R-G
1.2MHz
USPN-6 (5,000/Reel)
(*1) The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
Selection Guide

             
OUTPUT
TYPE
CL
LATCH
VOLTAGE AUTO-DISCHARGE
UVLO
CHIP CURRENT
ENABLE
LIMIT
SOFT-START TIME
A
Fixed
Yes
Yes
Yes
Yes
Yes
Fixed
Standard Voltage
VOUTʢVʣ
PRODUCT NAME
Fixed PWM
PWM/PFM Auto
1.0V
1.2V
1.5V
1.8V
2.5V
2.8V
3.3V
XC9244A10C7R-G
XC9244A12C7R-G
XC9244A15C7R-G
XC9244A18C7R-G
XC9244A25C7R-G
XC9244A28C7R-G
XC9244A33C7R-G
XC9245A10C7R-G
XC9245A12C7R-G
XC9245A15C7R-G
XC9245A18C7R-G
XC9245A25C7R-G
XC9245A28C7R-G
XC9245A33C7R-G
*For other voltages, please contact your local Torex sales office or representative.
2/24



Part Number XC9245
Description Step-Down DC/DC Converter
Maker Torex
Total Page 3 Pages
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XC9245 Datasheet PDF





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