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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
Maximum Duty Cycle
Minimum Duty Cycle
COMP Transconductance
V OUT = 4.5V
V OUT = 4.5V
V COMP = 1.5V
CONDITIONS
MIN
69
TYP
75
7.5
55
MAX
UNITS
%
%
μS
COMP Discharge Resistance
During shutdown or UVLO, from COMP to AGND
120
OUT Discharge Resistance
During shutdown or UVLO, from OUT to LX
10
k
FLED1/FLED2 CURRENT REGULATOR
IN Supply Current
Maximum Current Setting
Step-up off, FLED1/FLED2 on, supply current for each
current source
Flash
Movie
0.6
750
125
mA
mA
23.44mA setting
T A = +25 ° C
-5
+20
%
Current Accuracy
Current Regulator Dropout
(Note 2)
FLED1/FLED2 Leakage in
Shutdown
492.24mA setting
750mA setting
492.24mA setting
93.75mA setting
V FLED1 = V FLED2 = 5.5V
T A = +25 ° C
T A = -40 ° C to +85 ° C
T A = -40 ° C to +85 ° C
T A = +25 ° C
T A = +85 ° C
-2.5
-4
-10
-1
±0.5
50
0.01
0.1
+2.5
+4
+5
110
100
+1
%
%
mV
μA
INDLED CURRENT REGULATOR
IN Supply Current
Maximum Current Setting
Step-up converter off, INDLED on
0.6
16
mA
mA
0.5mA setting
T A = +25 ° C
-10
+10
%
Current Accuracy
Current Regulator Dropout
INDLED Leakage in Shutdown
16mA setting
16mA setting (Note 2)
V INDLED = 5.5V
T A = +25 ° C
T A = -40 ° C to +85 ° C
T A = +25 ° C
T A = +85 ° C
-3
-5
-1
±0.5
55
0.01
0.1
+3
+5
130
+1
%
%
mV
μA
PROTECTION CIRCUITS
NTC BIAS Current
19.4
20
20.6
μA
NTC Overtemperature Detection
Threshold
NTC Short Detection Threshold
Flash Duration Timer Range
Flash Duration Timer Accuracy
(400ms Setting)
Minimum Flash Duration
Flash Safety Timer Reset Inhibit
Period
Watchdog Timer Range
V NTC falling, 100mV hysteresis, NTC_CNTL[2:0] = 100
V NTC falling
In 50ms steps (Note 3)
T A = +25 ° C
T A = -40 ° C to +85 ° C
FLASH_EN[2:0] = 1XX
From falling edge of LED_EN until flash safety timer is
reset
In 4s steps
388
50
360
320
4
400
100
400
2
30
412
800
440
480
16
mV
mV
ms
ms
ms
ms
s
4
Maxim Integrated
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