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XC9237B15CMR

Description
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
File Size894KB,33 Pages
ManufacturerTOREX
Websitehttp://www.torex.co.jp/chinese/
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XC9237B15CMR Overview

600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters

XC9235/XC9236/XC9237
Series
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
ETR0514-011a
The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω
P-channel MOS driver transistor and 0.52ΩN-channel MOS 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 of 0.8V (accuracy:
±2.0%),
the output voltage can be set from 0.9V by using two external resistors.
The A/B/C/E/G types have 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, either 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 MOS driver transistor is forced OFF
when input voltage becomes 1.4V or lower.
The B to G types integrate C
L
discharge function which enables the electric charge at the output capacitor C
L
to be discharged
via the internal 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.
Three types of package SOT-25 (A/B/C types only), USP-6C, and 0.4mm low height USP-6EL (A/B/C types only) 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
Driver Transistor Built-In
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Control Methods
: 0.42Ω P-ch driver transistor
0.52Ω N-ch switch transistor
: 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)
: Current Limiter Circuit Built-In
(Constant Current & Latching)
C
L
Discharge (B/C/D/E/F/G types)
High Speed Soft Start (B/F/G type)
: Low ESR Ceramic Capacitor
: SOT-25 (A/B/C types only), USP-6C
USP-6EL(A/B/C types only)
: EU RoHS Compliant, Pb Free
■TYPICAL
APPLICATION CIRCUIT
●XC9235/XC9236/XC9237
A/B/C/E/G types (Output Voltage Fixed)
Function
Capacitor
Packages
Environmentally Friendly
■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
0.1
1
10
100
1000
Output Current:IOUT(mA)
2.4V
VIN= 4.2V
3.6V
PWM Control
VIN= 4.2V
3.6V
2.4V
PWM/PFM Automatic Sw itching Control
1/33
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