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Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
MAX8901B
THERMAL
REF
GND
SHUTDOWN
INTERNAL
750kHz OSC
SHUTDOWN
TIMER
BOOST
CONTROL
LOGIC
IC
POWER
IN
LX
PGND
OVP
CS
Gm
0.5V
PULSE
DIMMING
COMP
ON
EP
Figure 3. MAX8901B Block Diagram
The MAX8901_ feature:
? Internal soft-start that gradually illuminates the
WLEDs to eliminate inrush current during startup.
? Input overvoltage protection (6.5V max) that
prevents IC switching when exceeded.
Input Overvoltage Lockout
When V IN exceeds 6.2V (min), input overvoltage
lockout (OVLO) is engaged to protect the MAX8901_
from high-input voltage conditions. Once input OVLO
occurs, the MAX8901_ stop switching and no WLED
current flows, provided the forward voltage of the
?
?
WLED overvoltage protection (25V typ) that latches
off the IC.
Shutdown mode that reduces current to 0.01μA (typ).
WLED string is greater than V IN . When V IN falls below
6V (min), the input OVLO condition is cleared, and the
IC is enabled and enters soft-start.
No WLED current is present in shutdown or during an
overvoltage condition if the WLED forward voltage is
greater than the input supply voltage. Figures 2 and 3
show the block diagrams for the MAX8901A and
MAX8901B, respectively.
WLED Overvoltage Protection
WLED overvoltage protection (OVP) occurs when the
WLED output voltage rises above the WLED OVP
threshold. The WLED OVP protection circuitry latches
off the IC and the IC enters shutdown when the WLED
OVP threshold is exceeded. After OVP is engaged,
cycle V IN or toggle ON to reenable the IC and enter
soft-start.
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