LT3758 datasheet(8/28 Pages) AD

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LT8392

Rev. 0

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TYPICAL PERFORMANCE CHARACTERISTICS T

A = 25°C, unless otherwise noted.

Oscillator Frequency

vs Temperature

TEMPERATURE (°C)

–50 –25

100

500

600

400

300

200

700

125

100

150

8392 G28

RT = 59.0k

RT = 100k

RT = 226k

PIN FUNCTIONS

BG1: Buck Side Bottom Gate Drive. Drives the gate of

buck side bottom N-Channel MOSFET with a voltage

swing from ground to INTVCC.

BST1: Buck Side Bootstrap Floating Driver Supply. The

BST1 pin has an integrated bootstrap Schottky diode from

the INTVCC pin and requires an external bootstrap capac-

itor to the SW1 pin.

SW1: Buck Side Switch Node.

TG1: Buck Side Top Gate Drive. Drives the gate of buck

side top N-Channel MOSFET with a voltage swing from

SW1 to BST1.

LSP: Positive Terminal of the Buck Side Inductor Current

Sense Resistor (RSENSE). Ensure accurate current sense

with Kelvin connection.

LSN: Negative Terminal of the Buck Side Inductor Current

Sense Resistor (RSENSE). Ensure accurate current sense

with Kelvin connection.

VIN: Input Supply. The VIN pin must be tied to the power

input to determine the buck, buck-boost, or boost oper-

ation regions. Locally bypass this pin to ground with a

minimum 1µF ceramic capacitor.

INTVCC: Internal 5V Linear Regulator Output. The INTVCC

linear regulator is supplied from either the VIN pin or the

BIAS pin, and powers the internal control circuitry and

gate drivers. Locally bypass this pin to ground with a

minimum 4.7µF ceramic capacitor.

EN/UVLO: Enable and Undervoltage Lockout. Force the

pin below 0.3V to shut down the part and reduce VIN qui-

escent current below 2µA. Force the pin above 1.233V for

normal operation. The accurate 1.220V falling threshold

can be used to program an undervoltage lockout (UVLO)

threshold with a resistor divider from VIN to ground. An

accurate 2.5µA pull-down current allows the program-

ming of VIN UVLO hysteresis. If neither function is used,

tie this pin directly to VIN.

TEST: Factory Test. This pin is used for testing purpose

only and must be directly connected to ground for the

part to operate properly.

TRIM: Factory Trim. This pin is used for trim purposes

only and must be directly connected to VREF for the part

to operate properly.

VREF: Voltage Reference Output. The VREF pin provides an

accurate 2V reference capable of supplying 1mA current.

Locally bypass this pin to ground with a 0.47µF ceramic

capacitor.

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