MAX8834Y(2009) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8834Y
(Rev.:2009)

Adaptive Step-Up Converters with 1.5A Flash Driver

Maxim Integrated 

Adaptive Step-Up Converters

with 1.5A Flash Driver

ELECTRICAL CHARACTERISTICS (continued)

(VIN = 3.6V, VAGND = VPGND = VFGND = 0V, VDD = 1.8V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at

TA = +25°C.) (Note 1)

PARAMETER

Watchdog Timer Accuracy

(4s setting)

Open LED Detection Threshold

CONDITIONS

TA = +25°C

TA = -40°C to +85°C

FLED1, FLED2, INDLED enabled

MIN TYP MAX UNITS

3.6

4

4.4

s

3.2

4.8

100

mV

Shorted LED Detection Threshold FLED1, FLED2, INDLED enabled

VOUT -

V

1V

Open and Short Debounce Timer From LED open or short detected until LED current

regulator is disabled

Thermal-Shutdown Hysteresis

Thermal Shutdown

MAXFLASH

30

ms

20

°C

+160

°C

Low-Battery Detect Threshold

Range

33mV steps

2.5

3.4

V

Low-Battery Voltage Threshold

Accuracy

±2.5

%

Low-Battery Voltage Hysteresis

Programmable Range

100

200

mV

Low-Battery Voltage Hysteresis

Step Size

100

mV

Low-Battery Reset Time

LB_TMR[1:0] = 00

LB_TMR[1:0] = 01

200 250 300

μs

400 500 600

Note 1: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by

design.

Note 2: LED current regulator dropout voltage is defined as the voltage when current drops 10% from the current level measured at

0.6V.

Note 3: Flash duration is from rising edge of LED_EN until IFLED = 0A (safety time in one-shot mode).

Note 4: The adaptive output voltage regulation threshold is individually set on each device to 75mV above the dropout voltage of

the LED current regulators. This ensures minimum power dissipation on the IC during a flash event. The dropout voltage

chosen is the highest measured dropout voltage of FLED1, FLED2, and INDLED.

_______________________________________________________________________________________ 5

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