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8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
The MAX17105 is a high-efficiency driver for arrays of white
LEDs. It contains a fixed-frequency, current-mode PWM
step-up controller, a 5V linear regulator, dimming control
circuit, SMBus interface, internal power MOSFET, eight reg-
ulated current sources, and an external p-channel MOSFET
drive circuit. Figure 2 shows the MAX17105 functional
diagram. When enabled, the step-up controller boosts the
output voltage to provide sufficient headroom for the cur-
rent sources to regulate their respective string currents.
The MAX17105 features a resistor-adjustable switching fre-
quency (500kHz to 2MHz), which allows trade-offs between
external component size and operating efficiency.
IN
5V LINEAR
REGULATOR
TO FAULT
CONTROL
1.35V
ERROR
OUTPUT OVERVOLTAGE
COMPARATOR
1.25V
OVP
COMPARATOR
LX
V CC
V CC
CONTROL AND
DRIVER LOGIC
N
PGND
OSC
OSCILLATOR
SLOPE
COMPENSATION
CURRENT SENSE
FB8
FAULT
FAULT
CONTROL
8V
HVC
FB7
FB6
OVERVOLTAGE
COMPARATOR
FB5
FB4
COMP
Gm
LVC
FB3
FB2
ERROR
ISET
ISET
COMPARATOR
VSAT
FB1
EN
PWMI
DPWM CONTROL SIGNAL
EN
CURRENT SOURCE
CURRENT SOURCE
N
SGND
FB2
FB3
PWMO
CURRENT SOURCE
FB4
SCL
SDA
SMBus CONTROL
AND
DPWM GENERATOR
CURRENT SOURCE
FB5
DFSET
CURRENT SOURCE
CURRENT SOURCE
FB6
FB7
Figure 2. MAX17105 Functional Diagram
MAX17105
CURRENT SOURCE
FB8
14
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