LM2759

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SNVS577D – JUNE 2008 – REVISED MAY 2013

Table 3. Torch Current Table (Reg xA0)

CODE (Hex)

TORCH CURRENT (mA)

00

15

01

30

02

40

03

50

04

65

05

80

06

90

07

100

08

110

09

120

0A

130

0B

140

0C

150

0D

160

0E

170

0F

180

FLASH TIME-OUT FEATURE

Time-out Protection Circuitry disables the current sink when either the Strobe pin is held at logic high or the

prevents the device from self-heating due to the high power dissipation during Flash conditions. During the time-

through the Flash LED. When the device goes into a time-out condition, disabling and then re-enabling the

device will reset the time-out. Use the table below to set the desired Flash timeout duration.

Table 4. Flash Timeout Duration (Reg xC0)

CODE (Hex)

TIME (ms)

00

60

01

125

02

250

03

375

04

500

05

625

06

750

07

1100

CAPACITOR SELECTION

The LM2759 requires 4 external capacitors for proper operation. Surface-mount multi-layer ceramic capacitors

are recommended. These capacitors are small, inexpensive and have very low equivalent series resistance (ESR

<20 m

Ω typ.). Tantalum capacitors, OS-CON capacitors, and aluminum electrolytic capacitors are not

recommended for use with the LM2759 due to their high ESR, as compared to ceramic capacitors. For most

applications, ceramic capacitors with X7R or X5R temperature characteristic are preferred for use with the

LM2759. These capacitors have tight capacitance tolerance (as good as ±10%) and hold their value over

temperature (X7R: ±15% over -55°C to 125°C; X5R: ±15% over -55°C to 85°C). Capacitors with Y5V or Z5U

temperature characteristic are generally not recommended for use with the LM2759. Capacitors with these

temperature characteristics typically have wide capacitance tolerance (+80%, -20%) and vary significantly over

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