AS1310 datasheet(14/20 Pages) AMSCO

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AS1310

Datasheet - Application In formatio n

9.1.1 Power-OK and Low-Battery-Detect Functionality

LBO goes low in startup mode as well as during normal operation if:

- The voltage at the LBI pin is below LBI threshold (0.6V). This can be used to monitor the battery voltage.

- LBI pin is connected to GND and VOUT is below 92.5% of its nominal value. LBO works as a power-OK signal in this case.

The LBI pin can be connected to a resistive-divider to monitor a particular definable voltage and compare it with a 0.6V internal reference. If LBI

is connected to GND an internal resistive-divider is activated and connected to the output. Therefore, the Power-OK functionality can be realized

with no additional external components.

The Power-OK feature is not active during shutdown and provides a power-on-reset function that can operate down to VIN = 0.7V. A capacitor to

GND may be added to generate a power-on-reset delay. To obtain a logic-level output, connect a pull-up resistor R3 from pin LBO to pin VOUT.

Larger values for this resistor will help to minimize current consumption; a 100k

Ω resistor is perfect for most applications (see Figure 16 on page

13).

For the circuit shown in the left of Figure 15, the input bias current into LBI is very low, permitting large-value resistor-divider networks while

maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a defined resistor for R2 and then calculate R1

as:

(EQ 18)

Where:

VLBI is 0.6V ±30mV

Figure 15. Typical Application with Adjustable Battery Monitoring

Figure 16. Typical Application with LBO working as Power-OK

VIN

VLBI

----------- 1

–





⋅

VIN

0.7V to 3.6V

AS1310

22µF

Off

22µF

GND

VOUT

1.8V to 3.3V

VIN

VOUT

LBO

LBI

Low Battery Detect

6.8µH

CREF

100nF

REF

VIN

0.7V to 3.6V

AS1310

22µF

Off

22µF

GND

VOUT

1.8V to 3.3V

VIN

VOUT

LBO

LBI

Low Battery Detect

6.8µH

CREF

100nF

REF

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