LDS8869-002-T2【PDF 11/14 页】IC LED DVR WHT/CLR BCKLGT 16WQFN

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LDS8869

recognizes this condition as “LED Short” and disables

this channel. If LED pin voltage is less than (Vout –

1.5V), LDS8869 restores LED current at this

particular channel to programmed value.

2. V OUT Over-Voltage Protection

The charge pump’ output voltage V OUT automatically

limits at about 6.2 V maximum. This is to prevent the

output pin from exceeding its absolute maximum

rating.

3. V OUT Short Circuit Protection

If V OUT is shorted to ground before LDS8869 is

enabled, input current may increase up to 200 – 300

mA within 20 μs after enable and is limited to 35 – 40

mA after that.

4. Over-Temperature Protection

If the die temperature exceeds +150°C, the driver will

enter shutdown mode. The LDS8869 requires restart

after die temperature falls below 130°C.

5. Input Voltage Under-Voltage Lockout

If V IN falls below 2.2 V (typical value), LDS8869

enters shutdown mode and all registers data are

cleared. Device requires restart when input voltage

rises above 2.3 V. To restart device, set EN/SET pin

logic low, turn V IN off/on, set EN/SET pin logic high,

and program I LED using 1-wire interface.

6. Low V IN or High LED V F Voltage Detection

If, in 2x mode, V IN is too low to maintain regulated

LED current for given LED V F , or LED becomes an

open circuit, or if any LED at active channels is

modes, the input current ripple is very low, and an

input bypass capacitor of 1μF is sufficient.

In 1x mode, the device operates in linear mode and

does not introduce switching noise back onto the

supply.

Recommended Layout

In charge pump mode, the driver switches internally

at a high frequency. It is recommended to minimize

trace length to all four capacitors. A ground plane

should cover the area under the driver IC as well as

the bypass capacitors. Short connection to ground on

capacitors C IN and C OUT can be implemented with the

use of multiple via. A copper area matching the

TQFN exposed pad (TAB) must be connected to the

ground plane underneath. The use of multiple via

improves the package heat dissipation.

disconnected,

LDS8869

starts subsequently

changing modes (2x – 1x – 1.33x -1.5x – 2x - …) in

an attempt to compensate insufficient voltage. As a

result, average current at all other channels that are

ON may fall below regulated level.

LED Selection

LEDs with forward voltages (V F ) ranging from 1.6 V to

3.6 V may be used. Charge pumps operate in highest

efficiency when V F voltage is close to V IN voltage

multiplied by switching mode, i.e. V IN x 1, V IN x 1.33,

and so on. If the power source is a Li-ion battery,

LEDs with VF = 2.7V - 3.3V are recommended to

achieve highest efficiency performance and extended

operation on a single battery charge.

External Components

The driver requires two external 1 μF ceramic capa-

citors (C IN and C OUT ) and two 0.22 μF ceramic capa-

citors (C1 and C2) X5R or X7R type. Capacitors C1

and C2 may be increased up to 1 μF to improve

charge pump efficiency by 3%. In all charge pump

Figure 4. Recommended layout

? 2009 IXIS Corp.

Characteristics subject to change without notice

11

Doc. No. 8869_DS, Rev. N2.1

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