FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
applying a voltage higher than 2.2 V, the scaling factor is
disabled and the internal pull-ups are activated in both pins.
A0/SEN
Address select, device select pin, or Hardware Over-
voltage Protection (OVP) Control.
GROUND (GND)
Ground Reference for all internal circuits other than the
Boost FET.
CURRENT SET (ISET)
Each LED string can drive up to 50 mA. The maximum
current can be set by using a resistor from this pin to GND.
The Exposed Pad (EP) should be used for thermal heat
dissipation.
POSITIVE CURRENT SCALING (PIN)
I0-I9
Positive current scaling factor for the external analog
current control. Applying 0 V to this pin, scales the current to
0%, and in the same way, applying 2.048 V (Vset), the scale
factor is 100%. By applying a voltage higher than 2.2 V, the
scaling factor is disabled, and the internal pull-ups are
activated.
Current LED driver, each line has the capability of driving
up to 50 mA.
FAULT DETECTION PIN (FAIL)
When a fault situation is detected, this pin goes into high
impedance.
If PIN pin and NIN pin are used at the same time then by
applying 0 V to the PIN pin and 2.048 V to NIN pin, scales the
current to 0%, and in the same way, applying 2.048 V to the
PIN pin and 0 V to NIN pin, scales the current to 100%. By
applying a voltage higher than 2.2 V, the scaling factor is
disabled and the internal pull-ups are activated in both pins.
BOOST SLOPE COMPENSATION SETTING
RESISTOR (SLOPE)
Use an external resistor of about 68 kΩ to configure the
Boost compensation slope.
NEGATIVE CURRENT SCALING (NIN)
POWER GROUND TERMINALS (PGNDA, PGNDB)
Negative current scaling factor for the external analog
current control. Setting 0 V to this pin scales the current to
100%, in the same way, setting 2.048 V (Vset) the scale
factor is 0%. By applying a voltage higher than 2.2 V, the
scaling factor is disabled and the internal pull-ups are
activated.
Ground terminal for the internal Boost FET.
OUTPUT VOLTAGE SENSE TERMINAL (VOUT)
Input terminal to monitor the output voltage. It also
supplies the input voltage for the internal regulator 2 (VDC2).
If PIN pin and NIN pin are used at the same time then by
applying 0 V to the PIN pin and 2.048 V to NIN pin, scales the
current to 0%, and in the same way, applying 2.048 V to the
PIN pin and 0 V to NIN pin, scales the current to 100%. By
SWITCHING NODE TERMINALS (SWA, SWB)
Switching node of boost converter.
34844
Analog Integrated Circuit Device Data
Freescale Semiconductor
12
FREESCALE [ Freescale ]
