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LT3492
PIN FUNCTIONS
CTRL1, CTRL2, CTRL3: LED Current Adjustment Pins. Sets
voltage across external sense resistor between ISP and ISN
pins of the respective converter. Setting CTRL voltage to
be less than 1V will control the current sense voltage to be
one-tenth of CTRL voltage. If CTRL voltage is higher than
1V, the default current sense voltage is 100mV. The CTRL
pin must not be left ?oating.
FADJ: Switching Frequency Adjustment Pin. Setting FADJ
voltage to be less than 1V will adjust switching frequency
up to 2.1MHz. If FADJ voltage is higher than 1V, the default
switching frequency is 2.1MHz. The FADJ pin must not
be left ?oating.
GND: Signal Ground and Power Ground. Solder exposed
pad directly to ground plane.
ISN1, ISN2, ISN3: Noninverting Input of Current Sense
Error Ampli?er. Connect directly to LED current sense
resistor terminal for current sensing of the respective
converter.
ISP1, ISP2, ISP3: Inverting Input of Current Sense Error
Ampli?er. Connect directly to other terminal of LED current
sense resistor terminal of the respective converter.
OVP1, OVP2, OVP3: Open LED Protection Pins. A voltage
higher than 1V on OVP turns off the internal main switch
of the respective converter. Tie to ground if not used.
PWM1, PWM2, PWM3: Pulse Width Modulated Input.
Signal low turns off the respective converter, reduces
quiescent supply current and causes the V C pin for that
converter to become high impedance. PWM pin must not
be left ?oating; tie to V REF if not used.
SHDN : Shutdown Pin. Used to shut down the switching
regulator and the internal bias circuits for all three convert-
ers. Tie to 1.5V or greater to enable the device. Tie below
0.4V to turn off the device.
SW1, SW2, SW3: Switch Pins. Collector of the internal
NPN power switch of the respective converter. Connect
to external inductor and anode of external Schottky recti-
?er of the respective converter. Minimize the metal trace
area connected to this pin to minimize electromagnetic
interference.
TG1, TG2, TG3: The Gate Driver Output Pin for Discon-
nect P-Channel MOSFET. One for each converter. When
the PWM pin is low, the TG pin pulls up to ISP to turn
off the external MOSFET. When the PWM pin is high, the
external MOSFET turns on. ISPn-TGn is limited to 6.5V to
protect the MOSFET. Leave open if the external MOSFET
is not used.
V C1 , V C2 , V C3 : Error Ampli?er Compensation Pins. Connect
a series RC from these pins to GND.
V IN : Input Supply Pin. Must be locally bypassed. Powers
the internal control circuitry.
V REF : Reference Output Pin. Can supply up to 200μA. The
nominal Output Voltage is 2V.
3492fa
7
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