LTC3788IUH datasheet(10/32 Pages) LINER

Part #	LTC3788IUH

Description	2-Phase, Dual Output Synchronous Boost Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3788

10

3788f

PIN FUNCTIONS

PGOOD2 (Pin 14): Power Good Indicator for Channel 2.

Open-drain logic output that is pulled to ground when

the output voltage is more than ±10% away from the

regulated output voltage. To avoid false trips the output

voltage must be outside the range for 25μs before this

output is activated.

INTVCC (Pin 19): Output of Internal 5.4V LDO. Power

supply for control circuits and gate drives. Decouple this

pin to GND with a minimum 4.7μF low ESR tantalum or

ceramic capacitor.

EXTVCC (Pin 20): External Power Input. When this pin is

higher than 4.8V an internal switch bypasses the inter-

nal regulator and supply power to INTVCC directly from

EXTVCC.

PGND (Pin 21): Driver Power Ground. Connects to the

sources of bottom (main) N-channel MOSFETs and the

(–) terminal(s) of CIN and COUT.

VBIAS (Pin 22): Main Supply Pin. It is normally tied to the

input supply VIN or to the output of the boost converter.

A bypass capacitor should be tied between this pin and

the signal ground pin. The operating voltage range on this

pin is 4.5V to 38V (40V abs max).

BG1, BG2 (Pin 23, Pin 18): Bottom Gate. Connect to the

gate of the main NMOS.

BOOST1, BOOST2 (Pin 24, Pin 17): Floating power supply

for the synchronous NMOS. Bypass to SW with a capacitor

and supply with a Schottky diode connected to INTVCC.

TG1, TG2 (Pin 25, Pin 16): Top Gate. Connect to the gate

of the synchronous NMOS.

SW1, SW2 (Pin 26, Pin 15): Switch Node. Connect to the

source of the synchronous NMOS, the drain of the main

NMOS and the inductor.

PGOOD1 (Pin 27): Power Good Indicator for Channel 1.

Open-drain logic output that is pulled to ground when

the output voltage is more than ±10% away from the

regulated output voltage. To avoid false trips the output

voltage must be outside the range for 25μs before this

output is activated.

ILIM (Pin 28): Current Comparator Sense Voltage Range

Input. This pin is used to set the peak current sense volt-

age in the current comparator. Connect this pin to SGND,

open and INTVCC to set the peak current sense voltage to

50mV, 75mV, and 100mV, respectively.

SS1, SS2 (Pin 29, Pin 13): Output Soft-Start Input. A

capacitor to ground at this pin sets the ramp rate of the

output voltage during start-up.

ITH1, ITH2 (Pin 30, Pin 12): Current Control Threshold

and Error Ampliﬁer Compensation Point. The voltage on

this pin sets the current trip threshold.

VFB1, VFB2 (Pin 31, Pin 11): Error Ampliﬁer Feedback

Input. This pin receives the remotely sensed feedback

voltage from an external resistive divider connected across

the output.

SENSE1+, SENSE2+ (Pin 32, Pin 10): Positive Current

Sense Comparator Input. The (+) input to the current

comparator is normally connected to the positive terminal

of a current sense resistor. The current sense resistor is

normally placed at the input of the boost controller in

series with the inductor. This pin also supplies power to

the current comparator.

GND (Exposed Pad Pin 33): Ground. The exposed pad

must be soldered to the circuit board for rated thermal

performance.

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