TOREX Manuals

The XC9116 series is a fixed frequency, constant current step-up DC/DC converter ideal for driving LEDs used in backlighting applications such as cellular phones, PDAs and digital cameras. It can derive an output voltage of up to 17.5V, allowing for the driving of four white LEDs in series. The LED current can be set by an external resistor, ensuring all white LEDs can be turned on evenly. The converter has high efficiency and low feedback reference voltage, and utilizes an internal MOSFET with an RDSON of 2.0Ω. The high 1.0MHz switching frequency enables a low profile and small board area solution using a chip coil and an ultra small ceramic output capacitor (CL) of 0.22⎧F.

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The XC9110/9111 series is a group of PFM controlled step-up DC/DC converter/controller ICs designed to generate low supply voltage by the combination of PFM control and CMOS structure. The series is ideal for applications where a longer battery life is needed such as in portable communication equipment. With a built-in 2.5ΩN-channel driver transistor, the XC9110A/C/E and XC9111A/C/E types provide a step-up operation by using only a coil, a capacitor, and a diode connected externally. The XC9110/9111B, D and F versions can be used with an external transistor for applications requiring larger currents. Output voltage is internally programmable in a range from 1.5V to 7.0V in increments of 0.1V (accuracy:±2.5%). Maximum oscillation frequency is set to 100kHz for XC9110/9111 series. (At light loads, it is set to 180kHz for the XC9111 series.) Options include products equipped with a CE pin (C and D versions) that allows the IC to be shut down thereby reducing supply current and with separated VDD/VOUT pins (E and F versions) to separate the power supply block and the output voltage detect block. With the XC9110 series, maximum duty cycle is set to 75% (VDD=3.3V) making it suitable for use with large current operations. The XC9111 series automatically switches duty ratio between 56% & 75% (VDD=3.3V) when it senses changes in load to drop output ripple voltage and can support both

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XC9103/XC9104/XC9105 series are PWM, PWM/PFM auto switching /manual switching controlled universal step-up DC/DC converter controllers. Output will be stable no matter which load capacitors are used but should a low ESR capacitor be used, RSENSE of about 0.1Ω will be required and phase compensation will be achieved. This allows the use of ceramic capacitors and enables to obtain lower output ripple and small PCB design. Tantalum and electrolytic capacitors can also be used, in which case, RSENSE becomes unnecessary. With 0.9V internal voltage reference and by using externally connected two resistors, output voltage can be set freely within a range of 1.5V to 30V. The series is available in 300 kHz and 180 kHz frequencies, the size of the external components can be reduced. 100 kHz and 500 kHz are also available in custom options. The XC9103 offers PWM operation. The XC9104 offers PWM/PFM automatic switching operation. The PWM operation is shifted to the PFM operation automatically at light load so that it maintains high efficiency over a wide range of load currents. The XC9105 offers both PWM and PWM/PFM auto switching operations and it can be selected by external signal. A current limiter circuit is built-in to the IC (except with the 500 kHz version) and monitors the ripple voltage on the FB pin. Operation is shut down when the ripple voltage is more than 250mV.

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The XC9101 series is a PWM controlled step-up DC/DC controller with multiple current and voltage feedback functions. Current sense, clock frequencies, and amp feedback gain can all be externally regulated. It allows for a stable power supply with output currents of up to 1.5A. The output voltage is fixed internally and can be selected in 0.1V increments within a range of 2.5V ~ 16.0V (±2.5%). For output voltages outside this range, the FB version with a 0.9V internal reference voltage is recommended. Using this version, the required output voltage can be set using 2 external resistors. The switching frequency can also be set externally within a range of 100 ~ 600 kHz, allowing for selection of a frequency suited to the specific application. The current sense function enables control of peak currents flowing through the driver transistor and coil. The soft-start time can be adjusted using an external resistor and capacitor. During shutdown (CE pin=L), the consumption current can be reduced to as little as 0.5μA (TYP.) or less.

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The XC6371/XC6372 series are a group of PWM controlled and PWM/PFM controlled step-up DC/DC converters. They feature a built-in 1.4Ω switching transistor, allowing a step-up circuit to be configured using only three components: a coil, a diode, and a capacitor. The output voltage can be selected in the range from 2.0V to 7.0V with increments of 0.01V (accuracy: ±2.5%). The oscillation frequency can also be selected from 50kHz, 100kHz, and 180kHz (accuracy: ±15%). The soft-start time is internally set to protect against in-rush currents during power-on and prevent voltage overshoot. Packages with a CE (chip enable) pin are available to reduce IC power consumption during standby mode. The XC6371 series is the standard PWM controlled product, while the XC6372 series switches from PWM to PFM control during light loads when automatic switching is selected, offering high efficiency from light loads to large output currents.

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XC6367/XC6368 Series PWM Controlled, PWM/PFM Switchable Step-up DC/DC Controllers

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XCL205/XCL206/XCL207 series stable voltage chip, with switch tube and control IC inside, operating voltage range 2.0~6.0V, output current 600mA, working frequency 3.0MHz, with fast response, low ripple, high efficiency characteristics.

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The XCL201/XCL202 series is a synchronous step-down micro DC/DC converter that integrates an inductor and a control IC in one tiny package (2.5mm×2.0mm, h=1.0mm). A stable power supply with an output current of 400mA is configured using only 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 0.05V. The device is operated by 1.2MHz, and includes 0.42ΩP-channel driver transistor and 0.52ΩN-channel switching transistor. As for operation mode, the XCL201 series is PWM control, the XCL202 series is automatic PWM/PFM switching control, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load). During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μA or less.

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XC8102 series low on-resistance load switch IC with ON/OFF control and output current protection integrates a P-channel MOSFET. The series is suitable for applications such as mobile phones, smart phones, digital cameras, digital video cameras, portable game consoles and portable equipment.

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The XC8101 series is a low supply current load switch IC with ON/OFF control and output current protection which integrates P-channel MOSFET. The XC8101 is suited for power distribution switch. With connecting to the output pin of step-down DC/DC converters, the CE pin controls ON/OFF for each distribution switch to deliver power per requirements and maximize total power efficiency. As result, the XC8101 helps extend battery life and product operation time. The XC8101 is available in an ultra small package USP-4 and does not require any external capacitors so that it can provide small power unit design and board space saving. When low signal is input to the CE pin, the XC8101 enters stand-by mode. Even where a load capacitor is connected to the output pin during in the stand-by mode, the internal switch between the VOUT and VSS of the XC8101 enables the electric charge in the load capacitor to be discharged. Because of this discharge function, the VOUT pin voltage falls quickly to VSS level. The XC8101 contains an over current protection with foldback current circuitry which operates as

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XC6413/XC6414 series are highly precise, low noise, positive voltage LDO regulators with voltage detector manufactured using CMOS processes which features high ripple rejection and low dropout. The series is compased of a voltage reference, an error amplifier, a current limiter and a phase compensation circuit plus a driver transistor. Detect voltage is selectable in 0.1V increments within a range of 0.9V ~ 6.0V and VR output voltage is selectable within a range of 0.9V ~ 5.5V. The series is also compatible with low ESR ceramic capacitors which give added output stability. This stability can be maintained even during load fluctuations due to the excellent transient response of the series. The current limiter’s foldback circuit operates as a short-circuit protection as well as the output current limiter for the output pin. The series provides optional user selection for a variety of circuit applications such as detector monitoring, detector output logic, CE and EN pin input logic, internal pull-up/down resistors. The IC’s internal regulator circuit can be placed in stand-by mode via the EN function with the XC6413/14A to C series. The whole IC can be placed in stand-by mode, by placing EN pin input “high” level.

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The XC6408 series is a positive voltage regulator IC manufactured using CMOS process with 28V operation voltage. The series consists of a voltage reference, an error amplifier, a current limiter, a thermal shutdown circuit and a phase compensation circuit plus a driver transistor. The output voltage and the detect voltage are user selectable in 0.1V increments. The over current protection circuit and the thermal shutdown circuit are built-in. These two protection circuits will operate when the output current reaches current limit level or the junction temperature reaches temperature limit level. The XC6408D series monitors its output voltage and provides reset signal if its output voltage falls below the pre-set voltage. This reset time (release delay time) can be set by an external capacitor. The XC6408E series monitors an external power supply and enables the output to be turned off and the IC becomes a stand-by mode.

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The XC6402 series are precise, low noise, high current, positive voltage low dropout regulators with built-in voltage detector. They are fabricated using Torex’s CMOS process. The series features a voltage reference, an error amplifier, a current limiter, a voltage detector and a phase compensation circuit plus a driver transistor. The output voltage of the LDO and detect voltage of the detector is selectable in 50mV increments within the range of 0.8V to 5.0V. With a low ON resistance driver transistor built-in, batteries can be used until input-output voltage differential is minimal and can accordingly be used for a longer time. The series is also compatible with low ESR ceramic capacitors which give added output stability. The series provides options to the user to select from a variety of circuit features, such as detector monitoring, detector output logic, EN pin input logic, and internal pull-up / down resistance (semi-custom). The IC's internal regulator circuit can be placed in stand-by mode via the EN function (XC6402C series). In the stand-by mode, power consumption is greatly reduced. The XC6402F series offers the option of a delay on the detector output.

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The XC6421 series is an ultra small CMOS dual LDO regulator, mounting 300mA 2-channel small high speed LDO. The series features high accuracy, high ripple rejection and low dropout voltage. The series is capable of high density board installation by the ultra small package of two low on-resistance regulators. Both output accuracies are ±1% by laser trimming. Each regulator can be turned off independently to be in stand-by mode by controlling EN pin. In this state, the electric charge at the output capacitor (CL) is discharged via the internal auto-discharge switch, and as a result the VOUT voltage quickly returns to the VSS level. The output stabilization capacitor (CL) is also compatible with low ESR ceramic capacitors. The high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance. Over current protection circuit and over heat protection circuit are mounted, these circuits start working when output current reaches junction temperature or limit current. The two regulators are completely isolated so that a cross talk during load fluctuations is minimized

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The XC6420 series is a small dual CMOS LDO regulator with 2-channel 150mA outputs. The series features high speed, high accuracy, high ripple rejection and low dropout voltage. The series is capable of high density board installation by the small package of two low on-resistance regulators. Each output voltage is internally set in a range from 1.2V to 3.6V in increments of 0.05V with ±2% accuracy. The EN function controls the two regulators on/off independently. In the stand-by mode, the electric charge at the output capacitor CL is discharged via the internal switch and as a result the VOUT pin quickly returns to the VSS level. The series is also compatible with low ESR ceramic capacitors. The high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance. The two regulators are completely isolated so that a cross talk during load fluctuations is minimized.

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The XC6419 series is a dual CMOS LDO regulator with high accuracy, low output noise, high ripple rejection, and low dropout. Each output voltage can be independently set within a range of 0.8V to 5.0V. The series is suitable for applications such as mobile phones, cordless phones, portable games, digital cameras, portable audio equipment, and PDAs.

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The XC6415 series is a highly accurate, CMOS Dual LDO voltage regulator. Performance features include low output noise, high ripple rejection rate, and low dropout. Extremely dense power supply circuit can be organized with a 2 channeled high speed voltage regulator in low ON resistance which is built-in to an ultra small USP-6C package. The output voltage for each regulator is set independently by laser trimming and selectable in 0.05V increments within a range of 0.8 to 5.0V. The EN function allows the output of each regulator to be turned off independently. In this state, the electric charge at the output capacitor (CL) will be discharged via the internal auto-discharge switch, and as a result the VOUT pin quickly returns to the VSS level. The output stabilization capacitor (CL) is also compatible with low ESR ceramic capacitors. The high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance. Because regulator 1 and 2 are completely isolated, a cross talk between each channel, which causes a problem during load fluctuations, can be greatly reduced.

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The XC6411/XC6412 series is a dual LDO regulator manufactured using CMOS process. The series achieves very low supply current 0.8μ A typical by channel and consists of a reference voltage source, an error amplifier, a current foldback circuit, and a phase compensation circuit plus a driver transistor. The XC6411P series in SOT-25 packages, the XC6412B series in SOT-26 packages make high density mounting possible. Therefore, the series is ideally suited for applications where high density mounting is required such as mobile equipment. Each output voltage of two regulators VR1 and VR2 is selectable in 0.1V increments within a range of 0.9V to 5.0V by laser trimming. The series is compatible with low ESR ceramic capacitors, which provides stable outputs. The VR1 and VR2 are completely isolated so that a cross talk during load fluctuation is minimized. The current limiter's foldback circuit also operates as a short protection for the output pin.

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