TL1466I

HIGHSPEED/PRECISION SIX CHANNEL

SWITCHING REGULATOR CONTROLLER

SLVS262 − FEBRUARY 2000

1

POST OFFICE BOX 655303

Power Transistor

to 12 V

Stage

description

The TL1466I is a six channel pulse-width-modulation (PWM) control circuit. This device contains reference

voltage with a precision of

±2%, a triangle wave oscillator capable of high frequency oscillation up to 0.8 MHz,

various protection circuitry, and shutdown circuitry. The output regulation voltage for each channel is set by an

external resistor divider. Moreover, the output stage is capable of driving a PNP power transistor with high

speed. The high frequency/efficiency switching operation eliminates switching loss by using internal over-drive

circuitry at the rising edge and with reverse bias connecting external bootstrap capacitor at the falling edge. The

MOSFET can be used in parallel with the output diode at channel 1 and 4. This results in further high efficiency

operation replacing the constant time with this MOSFET when the output diode is turned on. Furthermore, it

operates 2.5 V supply voltage and balances switching current by switching repeatedly at the reverse phase with

two pairs (channel 1, 4, 6, and 2, 3, 5) of the six channels. The oscillator output of channel 1, 4, and 6 is reverse

phase for channel 2, 3, and 5. As a result of these features, this device is well-suited for power supply of portable

systems in battery-powered equipment.

FUNCTION TABLE FOR STANDBY

INPUT

OUTPUT

STANDBY

STANDBY-3

VREF

OUTPUT1, 2, 4, 5, 6

OUTPUT3

VI ≤ 0.4 V

X†

OFF

OFF

OFF

VI ≥ 2 V

VI ≥ 2 V

ON

ON

ON

VI ≥ 2 V

VI ≤ 0.4 V

ON

ON

OFF

† X: High-level or low-level

Copyright

 2000, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.