Torex XC9237

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 C L discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located between the L X and VSS pins. When the devices enter stand-by mode, output voltage quickly returns to the V SS level as a result of this function.Four types of package SOT-25, USP-6C, USP-6EL and WLP-5-03 are available.

Features

• Driver Transistor Built-In : 0.42Ω P-ch driver transistor0.52Ω N-ch switch transistor
• Input Voltage : 2.0V ~ 6.0V (A/B/C types)1.8V ~ 6.0V (D/E/F/G types)
• Output Voltage : 0.8V ~ 4.0V (Internally set)0.9V ~ 6.0V (Externally set)
• High Efficiency : 92% (TYP.)*
• Output Current : 600mA
• Oscillation Frequency : 1.2MHz, 3.0MHz (+15%)
• Maximum Duty Cycle : 100%Control Methods : PWM(XC9235)PWM/PFM Manual(XC9237)Function : 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)Capacitor : Low ESR Ceramic CapacitorOperating Ambient Temperature : -40℃ ~ 85 ℃Packages : SOT-25(A/B/B type only)USP-6CUSP-6EL(A/B/C types only)USP-6CUSP-6EL(A/B/C/G types only)WLP-5-03(A/B types only)Environmentally Friendly : EU RoHS Compliant, Pb Free
• Performance depends on external components and wiring on the PCB.

Typical applications

• Mobile devices/terminals, Smart phones/Mobile phones, Portable game consoles, Digital still cameras/Camcorders, Note PCs/Tablet PCs
• Bluetooth

More information

• Datasheet
• IC product information