XC9235/XC9236/XC9237Series
ETR0514-011a
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
☆GreenOperation Compatible
■GENERAL DESCRIPTION
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 CL discharge function which enables the electric charge at the output capacitor CL to be discharged
via the internal discharge switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage
quickly returns to the VSS 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.
■FEATURES
■APPLICATIONS
●Mobile phones, Smart phones
●Bluetooth headsets
Driver Transistor Built-In
: 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
Input Voltage
●Mobile WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
Output Voltage
●Digital cameras, Camcorders
●MP3 Players, Portable Media Players
●Notebook computers
High Efficiency
: 92% (TYP.)
Output Current
: 600mA
Oscillation Frequency
Maximum Duty Cycle
Control Methods
: 1.2MHz, 3.0MHz (+15%)
: 100%
: PWM (XC9235)
PWM/PFM Auto (XC9236)
PWM/PFM Manual (XC9237)
: Current Limiter Circuit Built-In
(Constant Current & Latching)
CL 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
Function
●XC9235/XC9236/XC9237
A/B/C/E/G types (Output Voltage Fixed)
Capacitor
Packages
Environmentally Friendly
■
TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency vs. Output Current（fOSC=1.2MHz, VOUT=1.8V）
●XC9235/XC9236/XC9237
PWM/PFM A utomatic Sw itc hing Control
100
D/F types (Output Voltage Externally Set)
90
80
VIN= 4.2V
70
PWM Control
VIN= 4.2V
3.6V
2.4V
3.6V
2.4V
60
50
40
30
20
10
0
0.1
1
10
100
1000
Output Current:IOUT(mA)
1/33
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