ILC6383 데이터 시트보기 (PDF) - Fairchild Semiconductor

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ILC6383

1-Cell to 3-Cell Boost DC-DC Converter with True Load Disconnect, 3.3V, 5V or Adjustable Output

Fairchild Semiconductor 

ILC6383

PRODUCT SPECIFICATION

Shut Down

The LBI pin is shared with the shutdown pin. A low voltage

(<0.4V) will put the ILC6383 into a power down state. The

simplest way to implement this is with an FET across R6 as

shown in Figure 8. Note that when the device is not in PWM

mode or is in shutdown the low battery detector does not

operate.

When the ILC6383 is shut down, the synchronous rectifier

disconnects the output from the input. This ensures that there

is only leakage (IIN < 1µA typical) from the input to the out-

put so that the battery is not drained when the ILC6383 is

shut down.

ON/OFF

2 VIN

ILC6383

R5

3

LBI/SD

R6

7 GND

Figure 8. Shut Down Control

Power Good Output (POK)

The POK output of the ILC6383 indicates when VOUT is

within the regulation tolerance of the set output voltage.

POK output is an open drain device output capable of sink-

ing 2mA. It will remain pulled low until the output voltage

has risen to typically 95% of the specified VOUT. Note that a

pull-up resistor must be connected from the POK output (pin

5 of ILC6383CIR-XX) to either ILC6383’s output or to

some other system voltage source.

Adjustable Output Voltage Selection

The ILC6383-ADJ allows the output voltage to be set using

a potential divider. The formula for setting the adjustable

output voltage is;

VOUT = VFB x (1+R1/R2), R1+R2 ≤ 100KΩ

where VFB is the threshold set which is 1.25V nominal.

CIN

47µF

L

VIN

1 to 3-cell

ON

OFF

15µH

R5

R6

ILC6383-ADJ

1

LX

2 VIN

VOUT 8

+

GND 7

3 LBI/SD LBO 6

4 SEL

VFB 5

MSOP-8

VOUT

47µF

COUT

R1

R2

PWM

PFM

VOUT = 1.25 (1+R1/R2)

Figure 9. Adjustable Voltage Configuration

Negative Voltage Output

It is possible to generate a negative output voltage as a sec-

ondary supply using the ILC6383. This negative voltage may

be useful in some applications where a negative bias voltage

at low current is required.

1A Schottky Diodes

-V

0.01µF

0.01µF

L

ILC6383

1 LX

VIN

2 VIN

Figure 10. Negative Output Voltage

8

REV. 1.2.6 6/13/02

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