ADP1650

Rev. 0 | Page 17 of 32

5 V OUTPUT OPERATION

The ADP1650 can be used as a 5 V boost to supply up to 500 mA for an audio voltage rail or keypad LED driver voltage. To move into

voltage regulation mode, the OUTPUT_EN bit must be set to 0. To enable the 5 V output, set LED_MOD[1:0] = 01, and set

OUTPUT_EN = 1. The ADP1650 sets the VOUT pin to 5 V and disconnects VOUT from LED_OUT. The VOUT pin is connected to the

SW node when the ADP1650 is not enabled. VOUT should not be connected directly to a positive external voltage source because this

will cause current to flow from VOUT to the battery.

ADP1650

10µF

1.0µH

INPUT VOLTAGE = 2.7V TO 5.0V

PGND

SW

STROBE

10µF

LED_OUT

EN

SGND

SCL

SDA

GPIO1

GPIO2

OFF

ON

SDA, SCL

EN

APPLICATIONS PROCESSOR

3.2 MEGAPIXEL

TO 5.0 MEGAPIXEL

CMOS IMAGE SENSOR

POWER-ON RESET

VOUT = 5.0V

KEYPAD

LED DRIVER

VDD

GND

VOUT*

VIN

*THE VOUT PIN IS CONNECTED TO THE SW NODE WHEN THE ADP1650 IS NOT ENABLED. VOUT SHOULD NOT BE CONNECTED DIRECTLY TO A POSITIVE

EXTERNAL VOLTAGE SOURCE BECAUSE THIS WILL CAUSE CURRENT TO FLOW FROM VOUT TO THE BATTERY.

Figure 38. ADP1650 Voltage Regulation Mode: LED Driver Application

VOUT = 5.0V ±8.5%, IMAX = 500mA

SHUTDOWN

VDD

OUT+

OUT–

IN+

GND

SD

AUDIO IN–

AUDIO IN+

SSM2315

80k

Ω

80k

Ω

160k

Ω

160k

Ω

BIAS

0.1µF

ADP1650

10µF

1.0µH

INPUT VOLTAGE = 2.7V TO 5.0V

PGND

SW

STROBE

10µF

LED_OUT

EN

SGND

SCL

SDA

GPIO1

GPIO2

OFF

ON

SDA, SCL

EN

APPLICATIONS PROCESSOR

3.2 TO 5.0 MEGAPIXEL

CMOS IMAGE SENSOR

POWER ON RESET

VOUT

VIN

IN–

47nF

47nF

FET

DRIVER

POP/CLICK

SUPPRESSION

INTERNAL

OSCILLATOR

MODULATOR

(Σ-Δ)

Figure 39. ADP1650 Voltage Regulation Mode: Class D Audio Application