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MAX8834Y/MAX8834Z
Adaptive Step-Up Converters
with 1.5A Flash Driver
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.6V, V AGND = V PGND = V FGND = 0V, V DD = 1.8V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at
T A = +25°C.) (Note 1)
PARAMETER
Watchdog Timer Accuracy
(4s setting)
Open LED Detection Threshold
CONDITIONS
T A = +25 ° C
T A = -40 ° C to +85 ° C
FLED1, FLED2, INDLED enabled
MIN
3.6
3.2
TYP
4
MAX
4.4
4.8
100
UNITS
s
mV
Shorted LED Detection Threshold FLED1, FLED2, INDLED enabled
V OUT -
1V
V
Open and Short Debounce Timer
Thermal-Shutdown Hysteresis
Thermal Shutdown
From LED open or short detected until LED current
regulator is disabled
30
20
+160
ms
° C
° C
MAXFLASH
Low-Battery Detect Threshold
Range
Low-Battery Voltage Threshold
Accuracy
Low-Battery Voltage Hysteresis
Programmable Range
Low-Battery Voltage Hysteresis
Step Size
33mV steps
2.5
100
±2.5
100
3.4
200
V
%
mV
mV
Low-Battery Reset Time
LB_TMR[1:0] = 00
LB_TMR[1:0] = 01
200
400
250
500
300
600
μs
Note 1: All devices are 100% production tested at T A = +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 I FLED = 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.
Maxim Integrated
5
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