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LTM8042/LTM8042-1
PIN FUNCTIONS
TG (Pin J7): Top Gate Driver Output. In response to an
active high PWM signal, this pin will drive the gate of an
external series P-channel MOSFET device low. An internal
7V clamp protects the PFET gate. This pin can also be used
to disconnect the load when RUN is pulled low. Leave TG
unconnected if not used.
PWM (Pin K1): Pulse Width Modulation Input Pin. A low
signal turns off the LED string, disables the main switch
and pulls the TG pin high. Drive above 1.55V to deliver
current to the output. Tie the PWM pin to the RUN pin if
not used. There is an equivalent 50k resistor from PWM
pin to ground internally.
BLOCK DIAGRAM
CTL (Pin L2): LED Current Adjustment Pin. Apply a voltage
between approximately 1V and 0V to modulate the LED +
output current, or tie a resistor to GND to modulate the
LED + current. CTL is internally tied to a 2V precision refer-
ence via a 20k 1% resistor. Leave floating if unused.
TGEN (Pin L3): Top Gate (TG) Enable Input Pin. Tie to 1.5V
or higher to enable the P-channel MOSFET driver function.
Tie the TGEN pin to ground if the TG function is not used.
There is an internal 40k resistor from TGEN to GND.
BSTIN/BKLED –
0.1μF
4.7μH
1M
0.1μF
R SNS
BSTOUT/BKIN
V CC
OPEN LED
0.10Ω (LTM8042)
0.27Ω (LTM8042-1)
LED +
0.1μF
CURRENT
PROTECTION
(1V THRESHOLD)
28.0k
RUN
MODE LED
CONTROLLER
CURRENT SENSE+
SS
PWM
SYNC
50k
CURRENT SENSE–
20.0k
1%
2V
TG
GND
RT
TGEN
CTL
80421 BD
80421fa
14
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