SP7648 datasheet(3/12 Pages) SIPEX

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Date: 7/20/05

SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

1VBATT

Battery Voltage. The startup circuitry is powered by this pin. Battery

Voltage is used to calculate switch off time: TOFF = KOFF/ (VOUT -

VBATT). When the battery voltage drops below 0.61V the SP7648

goes into an undervoltage lockout mode (UVLO), where the part is shut

down.

FLASH

Reference Control Input. Internal Reference defaults to 0.8V if FLASH

= LOW and 0.288V if FLASH = HIGH.

NC (Test)

No connection. This pin is bonded out for test purposes only and

must be left floating in all applications.

4RLIM

Current Limit Resistor. By connecting a resistor RLIM from this pin to

ground the inductor peak current is set by IPEAK=1600/RLIM. The range

for RLIM is 9kΩ (for 180mA) to 1.KΩ (for 1.6A).

SHDN

Shutdown Not. Tie this pin high to VBATT, for normal operation. Pull

this pin to ground to disable all circuitry inside the chip.

6FB

Feedback. Connect this pin to GND for fixed +5V operation. Connect

this pin to a resistor voltage divider between VOUT and GND for

adjustable output operation.

GND

Ground. Connect to ground plane.

PGND

Power Ground. The inductor charging current flows out of this pin.

9LX

Inductor Switching Node. Connect one terminal of the inductor to the

positive terminal of the battery. Connect the second terminal of the

inductor to this pin. The inductor charging current flows into LX,

through the internal charging N-channel FET, and out the PGND pin.

VOUT

Output Voltage. The inductor current flows out of this pin during

switch off-time. It is also used as the internal regulator voltage supply.

Connect this pin to the positive terminal of the output capacitor.

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