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XC9237A4HCMR

Description
Switching Regulator/Controller
CategoryPower/power management    The power supply circuit   
File Size614KB,23 Pages
ManufacturerTOREX
Websitehttp://www.torex.co.jp/chinese/
Environmental Compliance
Download Datasheet Parametric View All

XC9237A4HCMR Overview

Switching Regulator/Controller

XC9237A4HCMR Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
Objectid107688930
package instruction,
Reach Compliance Codecompliant
Country Of OriginJapan
ECCN codeEAR99
YTEOL2
Humidity sensitivity level1
Peak Reflow Temperature (Celsius)260
Maximum time at peak reflow temperature10
XC9235/XC9236/XC9237
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
ETR0514-003
☆Green
Operation Compatible
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. The ICs
enable a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two
capacitors connected externally. Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from
0.8V to 4.0V in increments of 50mV (accuracy:
±2.0%).
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. 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. Two types of package, SOT-25 (250mW) and
USP-6C (100mW), are available.
■GENERAL
DESCRIPTION
■APPLICATIONS
●Mobile
phones
●Bluetooth
equipment
●PDAs,
portable communication modem
●Portable
games
●Digital
cameras, video cameras
●Cordless
phones
●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
: 0.8V ~ 4.0V
: 92% (TYP.)
: 600mA
: 1.2MHz, 3.0MHz (+15%)
: 100%
: PWM (XC9235)
PWM/PFM Auto (XC9236)
PWM/PFM Manual (XC9237)
Soft-Start Circuit Built-In
Current Limiter Circuit Built-In (Constant Current & Latching)
Low ESR Ceramic Capacitor Compatible
Packages
: SOT-25, USP-6C
* Performance depends on external components and wiring on the PCB.
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●Efficiency
vs. Output Current(FOSC=1.2MHz, V
OUT
=1.8V)
XC9237A18C
L=4.7μH(NR4018) CIN=4.7μF CL=10μF
PWM/PFM Automatic Sw itc hing Control
100
90
80
Efficency:EFFI(%)
70
60
50
40
30
20
10
0
0.1
VIN = 4.2V
3.6V
2.4V
PWM Control
VIN = 4.2V
3.6V
2.4V
1
10
Output Current:IOUT(mA)
100
1000
1/23
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笨笨丁2018 Analog electronics

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