Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
IN
= 12V, V
DIM
= V
IN
, C
VCC
= 1µF, R
SENSE
= 0.5Ω, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage Range
Maximum Current Regulator
Switching Frequency
Ground Current
Supply Current
SYMBOL
V
IN
f
SW
I
GND
I
IN
UVLO
DRV open
V
DIM
< 0.6V
V
IN
= V
CSN
= V
DIM
, V
IN
rising from 4V until
V
DRV
> V
CC
- 0.5V
V
IN
= V
CSN
= V
DIM
, V
IN
falling from 6V,
V
DRV
< 0.5V
0.5
(V
IN
- V
CSN
) rising from 0V until V
DRV
<
0.5V (MAX16820)
(V
IN
- V
CSN
) rising from 0V until V
DRV
<
0.5V (MAX16819)
(V
IN
- V
CSN
) falling from 0.26V until V
DRV
>
(V
CC
- 0.5V) (MAX16820)
(V
IN
- V
CSN
) falling from 0.26V until V
DRV
>
(V
CC
- 0.5V) (MAX16819)
Falling edge of (V
IN
- V
CSN
) from 0.26V to
0V to DRV high, C
DRV
= 1nF
Rising edge of (V
IN
- V
CSN
) from 0V to
0.26V to DRV low, C
DRV
= 1nF
(V
IN
- V
CSN
) = 200mV
MAX16819
MAX16820
56
17
4.7
CONDITIONS
MIN
4.5
TYP
MAX
28.0
2
1.5
425
5.0
V
4.5
V
UNITS
V
MHz
mA
µA
Undervoltage Lockout
Undervoltage Lockout Hysteresis
SENSE COMPARATOR
195
213
176
158
210
230
190
170
82
82
225
mV
246
204
mV
182
ns
ns
1
70
35
µA
mV
mV
Sense Voltage Threshold High
V
SNSHI
Sense Voltage Threshold Low
V
SNSLO
Propagation Delay to Output High
Propagation Delay to Output Low
Current-Sense Input Current
Current-Sense Threshold
Hysteresis
t
DPDH
t
DPDL
I
CSN
CS
HYS
www.maximintegrated.com
Maxim Integrated
│
2
MAX16819/MAX16820
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Electrical Characteristics (continued)
(V
IN
= 12V, V
DIM
= V
IN
, C
VCC
= 1µF, R
SENSE
= 0.5Ω, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
GATE DRIVER
Gate Driver Source Current
Gate Driver Sink Current
Gate Driver Output-Voltage High
Gate Driver Output-Voltage Low
DIM INPUT
Maximum DIM Frequency
DIM Input-Voltage High
DIM Input-Voltage Low
DIM Hysteresis
DIM Turn-On Time
DIM Turn-Off Time
DIM Input Leakage High
DIM Input Leakage Low
VCC REGULATOR
Regulator Output Voltage
Load Regulation
Line Regulation
Power-Supply Rejection Ratio
Current Limit
Regulator Startup Time
PSRR
I
LIM
t
START
V
CC
I
VCC
= 0.1mA to 10mA, V
IN
= 5.5V to 28V
I
VCC
= 0.1mA to 10mA, V
IN
= 4.5V to 28V
I
VCC
= 0.1mA to 10mA, V
IN
= 12V
V
IN
= 6V to 28V, I
VCC
= 10mA
V
IN
= 12V, I
VCC
= 5mA, f
IN
= 10kHz
V
IN
= 4.5V, V
CC
= 0V
V
IN
= 4.5V, V
CC
= 4V
V
CC
= 0 to 4.5V
4.5
4.0
4
11
-35
45
18
350
5.5
5.5
V
V
Ω
mV
dB
mA
µs
f
DIM
V
IH
V
IL
DIM
HYS
t
DIMON
t
DIMOFF
DIM rising edge to V
DRV
= 0.5 x V
CC
,
C
DRV
= 1nF
DIM falling edge to V
DRV
= 0.5 x V
CC
,
C
DRV
= 1nF
V
DIM
= V
IN
V
DIM
= 0V
-1
V
CSN
= V
IN
, increase DIM until V
DRV
>
(V
CC
- 0.5V)
V
CSN
= V
IN
, decrease DIM until
V
DRV
< 0.5V
200
100
100
10
+1
2.8
0.6
20
kHz
V
V
mV
ns
ns
µA
µA
V
OH
V
OL
V
CSN
= V
IN
, V
DRV
= 0.5 x V
CC
V
CSN
= V
IN
- 250mV, V
DRV
= 0.5 x V
CC
I
DRV
= 10mA
I
DRV
= -10mA
V
CC
- 0.5
0.5
0.5
1
A
A
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
All devices are 100% production tested at T
J
= +25°C and +125°C. Limits to -40°C are guaranteed by design.
www.maximintegrated.com
Maxim Integrated
│
3
MAX16819/MAX16820
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Typical Operating Characteristics
(V
IN
= V
DIM
= 12V, C
VCC
= 1µF, R
SENSE
= 0.5Ω connected between IN and CSN. Typical values at T
A
= +25°C, unless otherwise
noted.)
DRV SWITCHING FREQUENCY
vs. V
IN
MAX16819 toc02
LED CURRENT VARIATION FROM SET CURRENT (%)
MAX16819 toc01
LED 4
DRV SWITCHING FREQUENCY (kHz)
95
90
EFFICIENCY (%)
85
80
75
70
65
60
5
LED 5
L = 47µH
LED 4
LED 3
LED 2
LED 1
LED 5
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
5
LED 3
10
15
LED 1
I
LED(NOMINAL)
= 400mA
L = 47µH
LED 2
L = 47µH
4
8
12
16
V
IN
(V)
20
24
28
LED 4
20
V
IN
(V)
LED 5
25
30
10
15
V
IN
(V)
20
25
30
MAX16819 toc04
5.4
5.3
5.2
V
CC
(V)
5.0
4.9
4.8
4.7
4.6
4.5
I
LED
= 0
5.1
5.39
5.38
5.37
V
CC
(V)
5.36
5.35
5.34
5.33
5.32
5.31
5.30
V
IN
= 24V
V
IN
= 12V
MAX16819 toc05
250
SUPPLY CURRENT (µA)
200
150
100
50
V
DIM
= 0V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5
V
IN
(V)
0
V
DIM
= 0V
4.5
8.5
12.5
16.5
V
IN
(V)
20.5
24.5
28.5
PWM DIMMING AT 200Hz
(10% DUTY CYCLE)
MAX16819 toc07
PWM DIMMING AT 200Hz
(90% DUTY CYCLE)
MAX16819 toc08
V
IN
= 12V, L = 47µH,
1 LED MAX16819
V
DIM
2V/div
0V
I
LED
200mA/div
0A
1ms/div
V
IN
= 12V, L = 47µH,
1 LED MAX16819
V
DIM
2V/div
0V
I
LED
200mA/div
0A
1ms/div
www.maximintegrated.com
Maxim Integrated
│
4
MAX16819 toc06
5.5
V
CC
vs. V
IN
5.40
V
CC
vs. TEMPERATURE
300
SUPPLY CURRENT vs. V
IN
MAX16819 toc03
100
EFFICIENCY vs. V
IN
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
2.0
LED CURRENT VARIATION vs. V
IN
MAX16819/MAX16820
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Typical Operating Characteristics (continued)
(V
IN
= V
DIM
= 12V, C
VCC
= 1µF, R
SENSE
= 0.5Ω connected between IN and CSN. Typical values at T
Microchip MCU
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