XC9235/XC9236/XC923
7
Series ETR0514-016
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 0.52Ω N-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 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.
Four types of package SOT-25, USP-6C, USP-6EL and WLP-5-03 are available.
■APPLICATIONS
■FEATURES
●Smart phones / Mobile phones
●Bluetooth
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 (Internally set)
0.9V ~ 6.0V (Externally set)
: 92% (TYP.)*
Input Voltage
●Mobile devices / terminals
●Portable game consoles
●Digital still cameras / Camcorders
●Note PCs / Tablet PCs
Output Voltage
High Efficiency
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
:-40℃ ~ +85℃
■
TYPICAL APPLICATION CIRCUIT
Function
●XC9235/XC9236/XC9237
A/B/C/E/G types (Output Voltage Fixed)
Capacitor
Operating Ambient Temperature
Packages
VOUT
600mA
L
V
IN
Lx
V
IN
: SOT-25 (A/B/C types only)
USP-6C
VSS
VSS
CIN
(ceramic)
USP-6EL (A/B/C/G types only)
WLP-5-03 (A/B types only)
: EU RoHS Compliant, Pb Free
C
L
CE/
MODE
VOUT
(ceramic)
CE/MODE
Environmentally Friendly
* Performance depends on external components and wiring on the PCB.
■
TYPICAL PERFORMANCE CHARACTERISTICS
●Efficiency vs. Output Current (fOSC=1.2MHz, VOUT=1.8V)
●XC9235/XC9236/XC9237
D/F types (Output Voltage Externally Set)
PWM/PFM Automatic Sw itching Control
100
90
80
VOUT
L
VIN= 4.2V
70
600mA
V
IN
V
IN
Lx
PWM Control
VIN= 4.2V
3.6V
2.4V
3.6V
2.4V
60
50
40
30
20
10
0
VSS
VSS
C
IN
RFB1
RFB2
C
(ceramic)
L
CFB
(ceramic)
CE/
MODE
FB
CE/MODE
0.1
1
10
100
1000
Output Current:IOUT(mA)
1/40
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