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XC9235G1CDML

Description
Switching Regulator/Controller
CategoryPower/power management    The power supply circuit   
File Size856KB,32 Pages
ManufacturerTOREX
Websitehttp://www.torex.co.jp/chinese/
Environmental Compliance
Download Datasheet Parametric View All

XC9235G1CDML Overview

Switching Regulator/Controller

XC9235G1CDML Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
Objectid109130025
package instruction,
Reach Compliance Codecompliant
Country Of OriginJapan
ECCN codeEAR99
YTEOL2
Peak Reflow Temperature (Celsius)260
Maximum time at peak reflow temperature10
XC9235/XC9236/XC9237
Series
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
ETR0514-008
The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω
P-channel driver transistor and 0.52ΩN-channel switching transistor, designed to allow the use of ceramic capacitors. Operating
voltage range is from 2.0V to 6.0V (A∼C types), 1.8V to 6.0V (D∼G types). For the D/F types which have a reference voltage
as 0.8V (accuracy:
±2.0%),
the output voltage can be set from 0.9V by using two eternal resistors. The A/B/C/E/G types having
a fixed output voltage from 0.8V to 4.0V in increments of 0.05V (accuracy:
±2.0%).
The device provides a high efficiency, stable
power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally.
With the built-in oscillator, ether 1.2MHz or 3.0MHz can be selected for suiting to your particular application. As for operation
mode, the XC9235 series is PWM control, the XC9236 series is automatic PWM/PFM switching control and the XC9237 series
can be manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, allowing fast
response, low ripple and high efficiency over the full range of loads (from light load to heavy load).
The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce current
consumption to as low as 1.0μA or less. The B/F/G types have a high speed soft-start as fast as 0.25ms in typical for quick
turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when
input voltage becomes 1.4V or lower.
The B to G types integrate C
L
auto discharge function which enables the electric charge at the output capacitor C
L
to be
discharged via the internal auto-discharge switch located between the L
X
and V
SS
pins. When the devices enter stand-by mode,
output voltage quickly returns to the V
SS
level as a result of this function.
Two types of package SOT-25 and USP-6C are available.
■GENERAL
DESCRIPTION
☆GreenOperation
Compatible
■APPLICATIONS
●Mobile
phones, Smart phones
●Bluetooth
headsets
●Mobile
WiMAX PDAs, MIDs, UMPCs
●Portable
game consoles
●Digital
cameras, Camcorders
●MP3
Players, Portable Media Players
●Notebook
computers
■FEATURES
P-ch Driver Transistor Built-In
N-ch Driver Transistor Built-In
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Control Methods
: ON resistance 0.42Ω
: ON resistance 0.52Ω
: 2.0V ~ 6.0V (A/B/C types)
: 1.8V ~ 6.0V (D/E/F/G types)
: 0.8V ~ 4.0V
: 92% (TYP.)
: 600mA
: 1.2MHz, 3.0MHz (+15%)
: 100%
: PWM (XC9235)
PWM/PFM Auto (XC9236)
PWM/PFM Manual (XC9237)
■TYPICAL
APPLICATION CIRCUIT
●XC9235/XC9236/XC9237
A/B/C/E/G types (Output Voltage Fixed)
Soft-Start Circuit Built-In
Current Limiter Circuit Built-In (Constant Current & Latching)
Low ESR Ceramic Capacitor Compatible
Packages
: SOT-25, USP-6C
C
L
High Speed Discharge
: B/C/D/E/F/G types
High Speed Soft Start
: B/F/G types
* Performance depends on external components and wiring on the PCB.
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●Efficiency
vs. Output Current(f
OSC
=1.2MHz, V
OUT
=1.8V)
●XC9235/XC9236/XC9237
D/F types (Output Voltage Externally Set)
Efficiency: EFFI (%)
Efficency:EFFI(%)
100
90
80
70
60
50
40
30
20
10
0
PWM/PFM Automatic Sw itching Control
VIN= 4.2V
3.6V
2.4V
PWM Control
VIN= 4.2V
3.6V
2.4V
0.1
1
10
100
1000
Output Current:IOUT(mA)
1/32
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