PWM Controlled Step-Up DC/DC Converters
The XC6372 series are a group of PWM controlled and PWM/PFM controlled step-up DC/DC converters. The built-in 1.4Ω switching transistor type enables a step-up circuit to be configured using only three components, a coil, a diode, and a capacitor. Output voltage can be selectable in the range from 2.0V to 7.0V in increments of 0.1V (±2.5%). Oscillation frequency is also selectable from 50kHz, 100kHz, and 180kHz (±15%) for the XC6372 series. Soft-start time is internally set and offers protection against in-rush currents when the power is switched on and prevents voltage overshoot. 5 pin packages, which are provided with either a CE (chip enable) function that reduces quiescent current during shut-down mode, or a VDD pin (separated power and voltage detect pins) are available.
The control of the XC6372 series switches from PWM to PFM control during light loads when automatically switching is selected and the series is highly efficient from light loads to large output currents.
Typical Application Circuit
|Operation Start Voltage Range||0.9V～10V|
|Output Voltage||2.0V～7.0V(0.1V increments)|
|MaximumOutput Current||100mA(TYP.)@VIN=3.0V, VOUT=5.0V|
|High Efficiency||85%(TYP.)@VIN=3.0V, VOUT=5.0V|
|Package||SOT-89||Number of Pins||3|
|Pcs/Reel||1,000||Package Size(mm)||4.5 x 4.0 x 1.6|
|Package||SOT-89-5||Number of Pins||5|
|Pcs/Reel||1,000||Package Size(mm)||4.5 x 4.6 x 1.5|
|Package||USP-6B||Number of Pins||6|
|Pcs/Reel||3,000||Package Size(mm)||1.8 x 2.0 x 0.6|
- Reliability Test Data SOT-89 [0.1MB](XC6372A)
- Reliability Test Data SOT-89-5 [0.1MB](XC6372C)
- Reliability Test Data USP-6B [0.1MB](XC6372)
- Material Declaration Sheet (Composition Table) SOT-89 [0.1MB](XC6372A)
- Material Declaration Sheet (Composition Table) SOT-89-5 [0.1MB](XC6372C)
- Material Declaration Sheet (Composition Table) USP-6B [0.1MB](XC6372A)
- Material Declaration Sheet (Composition Table) USP-6B [0.1MB](XC6372C)
How does the GO function of DC/DC converters work? Does it work just like a regulator?
Torex regard the PWM/PFM automatic switch control function as Green Operation (GO) in the case of DC/DC. The GO function is defined as the switching operation between the PFM mode for a small output current and the PWM mode for a large output current. The PFM control method controls the output current by increasing and decreasing the fall time according to the output current while keeping a pulse width. The PWM control method controls the output current by adjusting the pulse width of the rise time, which keeps the rise/fall time interval constant and increases the efficiency at a heavy load. By switching between the PFM control for a small output current and the PWM control for a large output current, the quiescent current can be controlled for both of heavy and light loads.
What is the soft-start function?
The function to soften the rise to prevent the inrush current.
What is the standby current?
The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.
What does the FB product mean?
An IC for which any output voltage can be set by the reference voltage of the FB pins and the external dividing resistor. The output voltage is determined by the RFB1 and RFB2 values, using the following formula: VOUT = Vref × (RFB1 + RFB2)/RFB2