Datasheet
4 Maxim Integrated
High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
MAX16833/MAX16833B–MAX16833D
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, R
RT
= 12.4kI, C
IN
= C
VCC
= 1µF, C
LFRAMP
/C
REF
= 0.1µF, NDRV = COMP = DIMOUT = PWMDIM = FLT = unconnected,
V
OVP
= V
CS
= V
PGND
= V
SGND
= 0V, V
ISENSE+
= V
ISENSE-
= 45V, V
ICTRL
= 1.40V, T
A
= T
J
= -40NC to +125NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE DRIVER (NDRV)
Peak Pullup Current I
NDRVPU
V
CC
= 7V, V
NDRV
= 0V 3 A
Peak Pulldown Current I
NDRVPD
V
CC
= 7V, V
NDRV
= 7V 3 A
Rise Time t
r
C
NDRV
= 10nF 30 ns
Fall Time t
f
C
NDRV
= 10nF 30 ns
R
DSON
Pulldown nMOS R
NDRVON
V
COMP
= 0V, I
SINK
= 100mA 0.25 0.6 1.1
I
PWM DIMMING (PWMDIM)
ON Threshold V
PWMON
1.19 1.225 1.26 V
Hysteresis V
PWMHY
70 mV
Pullup Resistance R
PWMPU
1.7 3 4.5
MI
PWMDIM to LED Turn-Off Time
PWMDIM falling edge to rising edge on
DIMOUT, C
DIMOUT
= 7nF
2
Fs
PWMDIM to LED Turn-On Time
PWMDIM rising edge to falling edge on
DIMOUT, C
DIMOUT
= 7nF
3
Fs
pMOS GATE DRIVER (DIMOUT)
Peak Pullup Current I
DIMOUTPU
V
PWMDIM
= 0V,
V
ISENSE+
- V
DIMOUT
= 7V
25 50 80 mA
Peak Pulldown Current I
DIMOUTPD
V
ISENSE+
- V
DIMOUT
= 0V
10 25 45 mA
DIMOUT Low Voltage with
Respect to V
ISENSE+
-8.7 -7.4 -6.3 V
OVERVOLTAGE PROTECTION (OVP)
Threshold V
OVPOFF
V
OVP
rising 1.19 1.225 1.26 V
Hysteresis V
OVPHY
70 mV
Input Leakage I
LOVP
V
OVP
= 1.235V -300 +300 nA
SHORT-CIRCUIT HICCUP MODE
Short-Circuit Threshold V
SHORT-HIC
(V
ISENSE+
- V
ISENSE-
) rising 285 298 310 mV
Hiccup Time t
HICCUP
8192
Clock
Cycles
Delay in Short-Circuit Hiccup
Activation
1
Fs
BUCK-BOOST SHORT-CIRCUIT DETECT
Buck-Boost Short-Circuit
Threshold
V
SHORT-BB
(V
ISENSE+
- V
IN
) falling, V
IN
= 12V 1.15 1.55 1.9 V
Delay in FLT Assertion from
Buck-Boost Short-Circuit
Condition
t
DEL-BB-SHRT
Counter increments only when
V
PWMDIM
> V
PWMON
8192
Clock
Cycles
Delay in FLT Deassertion After
Buck-Boost Short Circuit is
Removed (Consecutive Clock-
Cycle Count)
Counter increments only when
V
PWMDIM
> V
PWMON
8192
Clock
Cycles