Datasheet

3Maxim Integrated
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
MAX16814
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= 12V, R
RT
= 12.25kI, R
SETI
= 15kI, C
VCC
= 1FF, V
CC
= V
DRV
, NDRV = COMP = OUT_ = unconnected, V
RSDT
= V
DIM
= V
CC
, V
OVP
= V
CS
= V
LEDGND
= V
PGND
= V
SGND
= 0V, T
A
= T
J
= -40NC to +125NC for MAX16814A_ _, T
A
= -40NC to +85NC for
MAX16814BE_ _, and T
A
= T
J
= 0NC to +85NC for MAX16814U_ _ and MAX16814BU_ _, unless otherwise noted. Typical values are at
T
A
= +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Maximum Duty Cycle
f
SW
= 200kHz to 600kHz, MAX16814A_ _
and MAX16814U_ _
85 89 93
%
f
SW
= 600kHz to 2000kHz, MAX16814A_ _
and MAX16814U_ _
82 86 90
f
SW
= 200kHz to 600kHz, MAX16814B_ _ 90 94 98
f
SW
= 600kHz to 2000kHz, MAX16814B _ _ _ 86 90 94
Oscillator Frequency Accuracy
f
SW
= 200kHz to 2MHz, MAX16814A_ _
and MAX16814U_ _
-7.5 +7.5
%
f
SW
= 200kHz to 2MHz, MAX16814B_ _ _ -7 +7
Sync Rising Threshold 4 V
Minimum Sync Frequency 1.1f
SW
Hz
PWM COMPARATOR
PWM Comparator Leading-Edge
Blanking Time
60 ns
PWM to NDRV Propagation Delay Including leading-edge blanking time 90 ns
SLOPE COMPENSATION
Peak Slope Compensation
Current Ramp Magnitude
Current ramp added to the CS input,
MAX16814A_ _ only
44 49 54
µA x f
SW
Current ramp added to the CS input,
MAX16814U_ _ and MAX16814B_ _ _
45 50 55
CS LIMIT COMPARATOR
Current-Limit Threshold (Note 3) 396 416 437 mV
CS Limit Comparator to NDRV
Propagation Delay
10mV overdrive, excluding leading-edge
blanking time
10 ns
ERROR AMPLIFIER
OUT_ Regulation Voltage 1 V
Transconductance
g
M
340 600 880 µS
No-Load Gain (Note 4) 75 dB
COMP Sink Current V
OUT_
= 5V, V
COMP
= 2.5V 160 375 800 µA
COMP Source Current V
OUT_
= 0V, V
COMP
= 2.5V 160 375 800 µA
MOSFET DRIVER
NDRV On-Resistance
I
SINK
= 100mA (nMOS) 0.9
ω
I
SOURCE
= 100mA (pMOS) 1.1
Peak Sink Current V
NDRV
= 5V 2.0 A
Peak Source Current V
NDRV
= 0V 2.0 A
Rise Time C
LOAD
= 1nF 6 ns
Fall Time C
LOAD
= 1nF 6 ns
LED CURRENT SOURCES
OUT_ Current-Sink Range V
OUT_
= V
REF
20 150 mA
Channel-to-Channel Matching
I
OUT_
= 100mA ±2
%
I
OUT_
= 100mA, all channels on ±1.5