MAX16807 查看數據表（PDF） - Maxim Integrated

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MAX16807

Integrated 8-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

Maxim Integrated 

MAX16807

Integrated 8-Channel LED Driver with

Switch-Mode Boost and SEPIC Controller

Pin Description

PIN

1, 13, 28

2

3

4

5

6–9

10

NAME

FUNCTION

N.C.

No Connection. Not internally connected. Leave unconnected.

AGND Analog Ground

OUT

MOSFET Driver Output OUT. Connects to the gate of the external n-channel MOSFET.

VCC

Power-Supply Input. Bypass VCC to AGND with a 0.1µF ceramic capacitor or a parallel combination

of a 0.1µF and a higher value ceramic capacitor.

REF

5V Reference Output. Bypass REF to AGND with a 0.1µF ceramic capacitor.

OUT4–OUT7 LED Driver Outputs. OUT4–OUT7 are open-drain, constant-current-sinking outputs rated for 36V.

OE

Active-Low Output Enable Input. Drive OE low to PGND to enable the OUT0–OUT7. Drive OE high

to disable OUT0–OUT7.

11

12

14

15, 16

17

18

19

20–23

24

25

26

27

—

DOUT

Serial-Data Output. Data is clocked out of the 8-bit internal shift register to DOUT on CLK’s rising

edge.

SET

LED Current Setting. Connect RSET from SET to PGND to set the LED current.

V+

LED Driver Positive Supply Voltage. Bypass V+ to PGND with a 0.1µF ceramic capacitor.

PGND Power Ground

DIN

Serial-Data Input

CLK

Serial-Clock Input

Latch-Enable Input. Data is loaded transparently from the internal shift register(s) to the output

LE

latch(es) while LE is high. Data is latched into the output latch(es) on LE’s falling edge, and retained

while LE is low.

OUT0–OUT3 LED Driver Outputs. OUT0–OUT3 are open-drain, constant-current-sinking outputs rated for 36V.

COMP Error-Amplifier Output

FB

Error-Amplifier Inverting Input

CS

PWM Controller Current-Sense Input

RTCT

PWM Controller Timing Resistor/Capacitor Connection. A resistor RT from RTCT to REF and a

capacitor CT from RTCT to AGND set the oscillator frequency.

EP

Exposed Pad. Connect to the ground plane for improved power dissipation. Do not use as the only

ground connection for the part.

Detailed Description

The MAX16807 LED driver includes an internal switch-

mode controller that can be used as boost or buck-

boost (SEPIC) converters to generate the voltage

necessary to drive the multiple strings of LEDs. This device

incorporates an integrated low-side driver, programmable

oscillator (20kHz to 1MHz), error amplifier, low-voltage

(300mV) current sense for higher efficiency, and a 5V

reference to power up external circuitry (see Figures 1a

and 1b).

The MAX16807 LED driver includes a 4-wire serial inter-

face and a current-mode PWM controller to generate the

necessary voltage for driving eight open-drain, constant-

current-sinking output ports. The driver uses current-

sensing feedback circuitry (not simple current mirrors) to

ensure very small current variations over the full allowed

range of output voltage (see the Typical Operating

Characteristics). The 4-wire serial interface comprises

an 8-bit shift register and an 8-bit transparent latch. The

shift register is written through a clock input (CLK) and

a data input (DIN), and the data propagates to a data

output (DOUT). The data output allows multiple drivers to

be cascaded and operated together. The contents of the

8-bit shift register are loaded into the transparent latch

through a latch-enable input (LE). The latch is transpar-

ent to the shift-register outputs when high and latches the

current state on the falling edge of LE. Each driver output

is an open-drain, constant-current sink that should be

connected to the cathode of a string of LEDs con-

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