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19-0655; Rev 0; 10/06
Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
General Description
The MAX16807/MAX16808 are integrated, high-efficien-
cy white or RGB LED drivers. They are designed for
LCD backlighting and other LED lighting applications
with multiple strings of LEDs. The MAX16807/
MAX16808’s current-mode PWM controller regulates
the necessary voltage to the LED array. Depending on
the input voltage and LED voltage range, it can be
used with boost or buck-boost (SEPIC) topologies. The
MAX16807/MAX16808 feature an 8V to 26.5V input volt-
age range. A wide range of adjustable frequency
(20kHz to 1MHz) allows design optimization for efficien-
cy and minimum board space.
The MAX16807/MAX16808 LED drivers include eight
open-drain, constant-current-sinking LED driver outputs
rated for 36V continuous operation. The LED current-
control circuitry achieves ±3% current matching among
strings and enables paralleling of outputs for LED string
currents higher than 55mA. The output-enable pin is
used for simultaneous PWM dimming of all output chan-
nels. Dimming frequency range is 50Hz to 30kHz and
dimming ratio is up to 5000:1. The constant-current out-
puts are single resistor programmable and the LED cur-
rent can be adjusted up to 55mA per output channel.
The MAX16807/MAX16808 operate either in stand-alone
mode or with a microcontroller (µC) using an industry-
standard, 4-wire serial interface. The MAX16808 includes
circuitry that automatically detects open-circuit LEDs.
The MAX16807/MAX16808 include overtemperature
protection, operate over the full -40°C to +125°C tem-
perature range, and are available in a thermally
enhanced, 28-pin TSSOP exposed paddle package.
Pin Configurations appear at end of data sheet.
Features
♦
Eight Constant-Current Output Channels (Up to
55mA Each)
♦
±3% Current Matching Among Outputs
♦
Paralleling Channels Allows Higher Current per
LED String
♦
Outputs Rated for 36V Continuous Voltage
♦
Output-Enable Pin for PWM Dimming (Up to 30kHz)
♦
One Resistor Sets LED Current for All Channels
♦
Wide Dimming Ratio Up to 5000:1
♦
Low Current-Sense Reference (300mV) for High
Efficiency
♦
8V to 26.5V Input Voltage or Higher with External
Biasing Devices
♦
Open LED Detection (MAX16808)
♦
4-Wire Serial Interface to Control Individual
Output Channels
MAX16807/MAX16808
Applications
LCD White or RGB LED Backlighting:
LCD TVs, Desktop, and Notebook Panels
Automotive Navigation, Heads-Up,
and Infotainment Displays
Industrial and Medical Displays
Ambient, Mood, and Accent Lighting
Ordering Information
PART
MAX16807
AUI+
MAX16808
AUI+*
TEMP
RANGE
PIN-PACKAGE
PKG
CODE
-40°C to +125°C 28 TSSOP-EP** U28ME-1
-40°C to +125°C 28 TSSOP-EP** U28ME-1
+Denotes
lead-free package.
*Future
product—contact factory for availability.
**EP
= Exposed paddle.
Typical Operating Circuits
V
IN
L
V
OUT
D
C
OUT
Q
R1
LEDs
R
CS
C
C1
C
C2
R
C1
R2
3V TO 5.5V
OUT CS AGND
V
CC
C
IN
COMP
FB
V+
C
BYP
PGND
LE
DIN
CLK
DOUT
OE
SET
REF
R
SET
C
REF
R
T
C
T
RTCT
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
STAND-ALONE OPERATION
MAX16807
MAX16808
Typical Operating Circuits continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
MAX16807/MAX16808
ABSOLUTE MAXIMUM RATINGS
V
CC
to AGND..........................................................-0.3V to +30V
Current into V
CC
(V
CC
> 24V)...........................................±30mA
V+ to PGND..............................................................-0.3V to +6V
OUT to AGND.............................................-0.3V to (V
CC
+ 0.3V)
OUT Current (10µs duration) .................................................±1A
FB, COMP, CS, RTCT, REF to AGND.......................-0.3V to +6V
COMP Sink Current.............................................................10mA
OUT0–OUT7 to PGND............................................-0.3V to +40V
DIN, CLK, LE,
OE,
SET to PGND..................-0.3V to (V+ + 0.3V)
DOUT Current...................................................................±10mA
OUT0–OUT7 Sink Current...................................................60mA
Total PGND Current ..........................................................480mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TSSOP (derate 27mW/°C* above +70°C) .......2162mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
*Per
JEDEC51 Standard (Multilayer Board).
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 (PWM CONTROLLER)
(V
CC
= +15V, V+ = +3V to +5.5V referenced to PGND, R
T
= 10kΩ, C
T
= 3.3nF, REF = open, COMP = open, C
REF
= 0.1µF, V
FB
= 2V,
CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. T
J
= T
A
= -40°C to
+125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
REFERENCE
Output Voltage
Line Regulation
Load Regulation
Total Output-Voltage Variation
Output Noise Voltage
Output Short-Circuit Current
OSCILLATOR
Initial Accuracy
Voltage Stability
Temperature Stability
RTCT Ramp Peak-to-Peak
RTCT Ramp Valley
Discharge Current
Frequency Range
ERROR AMPLIFIER
FB Input Voltage
Input Bias Current
Open-Loop Gain
Unity-Gain Bandwidth
Power-Supply Rejection Ratio
COMP Sink Current
COMP Source Current
COMP Output-Voltage High
COMP Output-Voltage Low
V
FB
I
B(FB)
A
VOL
f
GBW
PSRR
I
SINK
I
SOURCE
V
OH
V
OL
12V
≤
V
CC
≤
25V
V
FB
= 2.7V, V
COMP
= 1.1V
V
FB
= 2.3V, V
COMP
= 5V
V
FB
= 2.3V, R
COMP
= 15kΩ to AGND
V
FB
= 2.7V, R
COMP
= 15kΩ to V
REF
60
2
0.5
5
2V
≤
V
COMP
≤
4V
FB shorted to COMP
2.45
2.50
-0.01
100
1
80
6
1.2
5.8
0.1
1.1
1.8
2.55
-0.1
V
µA
dB
MHz
dB
mA
mA
V
V
I
DIS
f
OSC
V
RTCT
= 2V, T
J
= +25°C
V
RTCT
= 2V, -40 C
≤
T
J
≤
+125°C
o
SYMBOL
V
REF
∆V
LINE
∆V
LOAD
V
REFT
V
NOISE
I
SHORT
CONDITIONS
I
REF
= 1mA, T
J
= +25°C
12V< V
CC
< 25V, I
REF
= 1mA
1mA < I
REF
< 20mA
(Note 2)
10Hz < f < 10kHz
V
REF
= 0V
T
J
= +25°C
12V < V
CC
< 25V
MIN
4.95
TYP
5
0.4
6
MAX
5.05
4
50
5.125
UNITS
V
mV
mV
V
µV
mA
kHz
%
%
V
V
4.875
50
30
51
54
0.2
1
1.7
1.1
7.9
7.5
20
8.3
8.3
180
57
0.5
8.7
9.0
1000
mA
kHz
2
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Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
ELECTRICAL CHARACTERISTICS (PWM CONTROLLER) (continued)
(V
CC
= +15V, V+ = +3V to +5.5V referenced to PGND, R
T
= 10kΩ, C
T
= 3.3nF, REF = open, COMP = open, C
REF
= 0.1µF, V
FB
= 2V,
CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. T
J
= T
A
= -40°C to
+125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
CURRENT-SENSE AMPLIFIER
Current-Sense Gain
Maximum Current-Sense Signal
Power-Supply Rejection Ratio
Current-Sense Input Bias Current
Current Sense to OUT Delay
MOSFET DRIVER
OUT Low-Side On-Resistance
OUT High-Side On-Resistance
Source Current (Peak)
Sink Current (Peak)
Rise Time
Fall Time
Startup Voltage Threshold
Minimum Operating Voltage After
Turn-On
Undervoltage-Lockout Hysteresis
Maximum Duty Cycle
Minimum Duty Cycle
SUPPLY CURRENT
Startup Supply Current
Operating Supply Current
V
CC
Zener Voltage
I
START
I
CC
V
Z
V
CC
= 7.5V
V
FB
= V
CS
= 0V
I
CC
= 25mA
24
32
3
26.5
65
5
µA
mA
V
V
RDS_ONL
V
RDS_ONH
I
SOURCE
I
SINK
t
R
t
F
V
CC_START
V
CC_MIN
UVLO
HYST
D
MAX
D
MIN
94.5
I
SINK
= 200mA
I
SOURCE
=
100mA
C
LOAD
= 10nF
C
LOAD
= 10nF
C
LOAD
= 1nF
C
LOAD
= 1nF
7.98
7.1
T
J
= -40°C to +85°C (Note 2)
T
J
= -40°C to +125°C
T
J
= -40°C to +85°C (Note 2)
T
J
= -40°C to +125°C
4.5
4.5
3.5
3.5
2
1
15
22
8.4
7.6
0.8
96
97.5
0
8.82
8.0
10
12
7.5
10
Ω
Ω
A
A
ns
ns
V
V
V
%
%
A
CS
V
CS_MAX
PSRR
I
CS
t
PWM
(Notes 3, 4)
(Note 3)
12V
≤
V
CC
≤
25V
V
COMP
= 0V
50mV overdrive
2.85
0.275
3.00
0.300
70
-1
60
-2.5
3.40
0.325
V/V
V
dB
µA
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX16807/MAX16808
UNDERVOLTAGE LOCKOUT/STARTUP
PULSE-WIDTH MODULATION (PWM)
_______________________________________________________________________________________
3
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Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
MAX16807/MAX16808
ELECTRICAL CHARACTERISTICS (LED DRIVER)
(V+ = +3V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. T
A
= T
J
= -40°C
to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Operating Supply Voltage
Output Voltage
Standby Current (Interface Idle, All
Output Ports High Impedance)
Standby Current
(Interface Active, All Output Ports
High Impedance)
Supply Current
(Interface Idle, All Output Ports
Active Low)
INTERFACE (DIN, CLK, DOUT, LE,
OE)
Input-Voltage High
(DIN, CLK, LE,
OE)
Input-Voltage Low
(DIN, CLK, LE,
OE)
Hysteresis Voltage
(DIN, CLK, LE,
OE)
Input Leakage Current
(DIN, CLK)
OE
Pullup Current to V+
LE Pulldown Current to PGND
Output-Voltage High (DOUT)
Output-Voltage Low (DOUT)
V
IH
V
IL
V
HYST
I
LEAK
I
OE
I
LE
V
OH
V
OL
V+ = 5.5V,
OE
= PGND
V+ = 5.5V, LE = V+
I
SOURCE
= 4mA
I
SINK
= 4mA
0 C
≤
T
A
≤
+125°C, V
OUT
= 1V to 2.5V, R
SET
=
360Ω
o
SYMBOL
V+
V
OUT_
CONDITIONS
MIN
3.0
TYP
MAX
5.5
36
UNITS
V
V
mA
R
SET
= 360Ω, DIN, LE, CLK = PGND or V+,
OE
= V+, DOUT unconnected
R
SET
= 360Ω, f
CLK
= 5MHz,
OE
= V+,
DIN, LE = PGND or V+, DOUT unconnected
R
SET
= 360Ω,
OE
= PGND, DIN,
LE = V+, DOUT unconnected
3.6
4.5
3.8
4.8
mA
I+
17
30
mA
0.7
x V+
0.3
x V+
0.8
-1
0.25
0.25
V+
- 0.5V
0.5
46.5
43
50
53.5
1.5
1.5
+1
25.0
25.0
V
V
V
µA
µA
µA
V
V
OUT_ Output Current
I
OUT_
T
A
= -40°C, V
OUT
= 1V to 2.5V,
R
SET
= 360Ω
OE
= V+
mA
57
1
0.8
µA
V
OUT_ Leakage Current
OUT_ Fault Detection Threshold
(MAX16808)
V
OUTTH
V+ = 5.5V,
OE
= V+
4
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Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
5V TIMING CHARACTERISTICS
(V+ = +4.5V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. TA = TJ = -40°C
to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 5)
PARAMETER
CLK Clock Period
CLK Pulse-Width High
CLK Pulse-Width Low
DIN Setup Time
DIN Hold Time
DOUT Propagation Delay
DOUT Rise Time
DOUT Fall Time
LE Pulse-Width High
LE Setup Time
LE Rising to OUT_ Rising Delay
LE Rising to OUT_ Falling Delay
CLK Rising to OUT_ Rising Delay
CLK Rising to OUT_ Falling
Delay
OE
Rising to OUT_ Rising Delay
OE
Falling to OUT_ Falling Delay
OUT_ Turn-On Fall Time
OUT_ Turn-Off Rise Time
SYMBOL
t
CP
t
CH
t
CL
t
DS
t
DH
t
DO
t
DR
t
DF
t
LW
t
LS
t
LRR
t
LRF
t
CRR
t
CRF
t
OER
t
OEF
t
F
t
R
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
80% to 20% (Note 6)
20% to 80% (Note 6)
C
DOUT
= 10pF, 20% to 80%
C
DOUT
= 10pF, 80% to 20%
20
15
110
325
110
325
110
325
210
130
CONDITION
MIN
40
19
19
4
8
12
50
10
10
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MAX16807/MAX16808
INTERFACE TIMING CHARACTERISTICS
_______________________________________________________________________________________
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