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MC34844A
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
A0/SEN
Address select, device select pin, or Hardware Over-
voltage Protection (OVP) Control.
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.
POSITIVE CURRENT SCALING (PIN)
Positive current scaling factor for the external analog
current control. Applying 0 V to this pin, scales the current to
near 0%, and in the same way, applying V SET (2.048 V Typ.),
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.
If PIN pin and NIN pin are used at the same time then by
applying 0 V to the PIN pin and V SET to NIN pin, scales the
current to near 0%, and in the same way, applying V SET 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.
NEGATIVE CURRENT SCALING (NIN)
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 V SET (2.048 V Typ.) the scale
factor is near 0%. By applying a voltage higher than 2.2 V, the
scaling factor is disabled and the internal pull-ups are
activated.
If PIN pin and NIN pin are used at the same time then by
applying 0 V to the PIN pin and V SET to NIN pin, scales the
current to near 0%, and in the same way, applying V SET 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.
GROUND (GND)
Ground Reference for all internal circuits other than the
Boost FET.
The Exposed Pad (EP) should be used for thermal heat
dissipation.
I0-I9
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.
BOOST SLOPE COMPENSATION SETTING
RESISTOR (SLOPE)
The resistor to be used for the SLOPE depends on the
Input and Output voltage difference as well as the inductor
value. Please use the formula shown in the Components
Calculation section to calculate the value accordingly.
POWER GROUND TERMINALS (PGNDA, PGNDB)
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).
SWITCHING NODE TERMINALS (SWA, SWB)
Switching node of boost converter.
34844A
Analog Integrated Circuit Device Data
Freescale Semiconductor
43
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