LTC1266CS datasheet(6/20 Pages) LINER

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LTC1266

LTC1266-3.3/LTC1266-5

PI FU CTIO S

TDrive (Pin 1): High Current Drive for Topside MOSFET.

This MOSFET can be either P-channel or N-channel, user

selectable by Pin 3. Voltage swing at this pin is from PWR

VIN to ground.

PWR VIN (Pin 2): Power Suppy for Drive Signals. Must be

closely decoupled to power ground (Pin 15).

PINV (Pin 3): Phase Invert. Sets the phase of the topside

driver to drive either a P-channel or an N-channel MOSFET

as follows:

P-channel: Pin 3 = 0V

N-channel: Pin 3 = PWR VIN

BINH (Pin 4): Burst Mode Operation Inhibit. A CMOS logic

high on this pin will disable the Burst Mode operation

feature forcing continuous operation down to zero load.

VIN (Pin 5): Main Supply Pin.

CT (Pin 6): External Capacitor. CT from Pin 4 to ground sets

the operating frequency. The actual frequency is also

dependent on the input voltage.

ITH (Pin 7): Gain Amplifier Decoupling Point. The current

comparator threshold increases with the Pin 7 voltage.

Sense– (Pin 8): Connects to internal resistive divider

which sets the output voltage in LTC1266-3.3 and

LTC1266-5 versions. Pin 8 is also the (–) input for the

current comparator.

Sense+ (Pin 9): The (+) Input to the Current Comparator.

A built-in offset between Pins 8 and 9 in conjunction with

RSENSE sets the current trip threshold.

VFB (Pin 10): For the LTC1266 adjustable version, Pin 10

serves as the feedback pin from an external resistive

divider used to set the output voltage. On LTC1266-3.3

and LTC1266-5 versions this pin is not used.

SHDN (Pin 11): When grounded, the LTC1266 series

operates normally. Pulling Pin 11 high holds both MOSFETs

off and puts the LTC1266 in micropower shutdown mode.

Requires CMOS logic signal with tr, tf < 1µs. Should not be

left floating.

SGND (Pin 12): Small-Signal Ground. Must be routed

separately from other grounds to the (–) terminal of COUT.

LBIN (Pin 13): Input to the Low-Battery Comparator. This

input is compared to an internal 1.25V reference.

LBOUT (Pin 14): Open Drain Output of the Low-Battery

Comparator. This pin will sink current when Pin 13 is

below 1.25V.

PGND (Pin 15): Driver Power Ground. Connects to source

of N-channel MOSFET and the (–) terminal of CIN.

BDrive (Pin 16): High Current Drive for Bottom N-Chan-

nel MOSFET. Voltage swing at Pin 16 is from ground to

PWR VIN.

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