LM73606 datasheet(3/53 Pages) TI1

3 / 53 page

VCC

BIAS

SS/TRK

PVIN

DAP

PVIN

PGND

CBOOT

PGND

PGOOD

AGND

SYNC/

MODE

PVIN

LM73605, LM73606

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SNVSAH5 – SEPTEMBER 2017

Product Folder Links: LM73605 LM73606

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(1)

A = Analog, O = Output, I = Input, G = Ground, P = Power

5 Pin Configuration and Functions

RNP Package

30-Pin Wettable Flanks QFN (WQFN) 6 mm × 4 mm × 0.8 mm

Top View

Pin Functions

I/O(1)

DESCRIPTION

NO.

NAME

1, 2, 3, 4, 5

Switching output of the regulator. Internally connected to source of the HS FET and drain of the LS

FET. Connect to power inductor and boot-strap capacitor.

CBOOT

Boot-strap capacitor connection for HS FET driver. Connect a high-quality 470-nF capacitor from

this pin to the SW pin.

VCC

Output of internal bias supply. Used as supply to internal control circuits and drivers. Connect a

high-quality 2.2-µF capacitor from this pin to GND. TI does not recommend loading this pin by

external circuitry.

BIAS

Optional BIAS LDO supply input. TI recommends tying to VOUT when 3.3 V ≤ VOUT ≤ 18 V, or tie to

an external 3.3-V or 5-V rail if available, to improve efficiency. BIAS pin voltage must not be

greater than VIN. Tie to ground when not in use.

Switching frequency setting pin. Place a resistor from this pin to ground to set the switching

frequency. If floating, the default switching frequency will be 500 kHz. Do not short to ground.

SS/TRK

Soft-start control pin. Leave this pin floating for a 5-ms internal soft-start ramp. An external

capacitor can be connected from this pin to ground to extend the soft start time. A 2-µA current

sourced from this pin charges the capacitor to provide the ramp. Connect to external ramp for

tracking. Do not short to ground.

Feedback input for output voltage regulation. Connect a resistor divider to set the output voltage.

Never short this pin to ground during operation.

12–15,

27–30

—

No internal connection. Connect to ground net and copper to improve heat sinking and board-level

reliability.

PGOOD

Open drain power-good flag output. Connect to suitable voltage supply through a current limiting

resistor. High = VOUT regulation OK, Low = VOUT regulation fault. PGOOD = LOW when EN = low

and VIN > 2 V.

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