Pin Functions - Analog Devices Linear Technology LTM8026 Manual

LTM8026
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, unless otherwise noted. Configured per Table 1, where applicable.
A
CTL_I Voltage vs Load Current,
CTL_T = 2V
2.5
2.0
1.5
1.0
0.5
0
0

PIN FUNCTIONS

V (Bank 1): Power Output Pins. Apply the output filter
OUT
capacitor and the output load between these pins and
GND pins.
GND (Bank 2): Tie these GND pins to a local ground plane
below the LTM8026 and the circuit components. In most
applications, the bulk of the heat flow out of the LTM8026
is through these pads, so the printed circuit design has a
large impact on the thermal performance of the part. See
the PCB Layout and Thermal Considerations sections for
more details. Return the feedback divider (R
V (Bank 3): The V pins supply current to the LTM8026's
IN IN
internal regulator and to the internal power switches. These
pins must be locally bypassed with an external, low ESR
capacitor; see Table 1 for recommended values.
CTL_T (Pin D8): Connect a resistor/NTC thermistor network
to the CTL_T pin to reduce the maximum regulated output
current of the LTM8026 in response to temperature. The
maximum control voltage is 1.5V. If this function is not
used, tie this pin to V .
REF
10
1 2 3 4 5 6
LOAD CURRENT (A)
8026 G54
) to this net.
ADJ
For more information
CTL_T Voltage vs Load Current,
CTL_I = 2V
2.5
2.0
1.5
1.0
0.5
0
0 1 2
LOAD CURRENT (A)
CTL_I (Pin E8): The CTL_I pin reduces the maximum
regulated output current of the LTM8026. The maximum
control voltage is 1.5V. If this function is not used, tie
this pin to V .
REF
V (Pin F8): Buffered 2V Reference Capable of 0.5mA
REF
Drive.
RT (Pin G8): The RT pin is used to program the switching
frequency of the LTM8026 by connecting a resistor from
this pin to ground. The Applications Information section
of the data sheet includes a table to determine the resis-
tance value based on the desired switching frequency.
When using the SYNC function, apply a resistor value
equivalent to 20% lower than the SYNC pulse frequency.
Do not leave this pin open.
COMP (Pin H8): Compensation Pin. This pin is generally
not used. The LTM8026 is internally compensated, but
some rare situations may arise that require a modification
to the control loop. This pin connects directly to the PWM
comparator of the LTM8026. In most cases, no adjustment
is necessary. If this function is not used, leave this pin open.
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3 4 5 6
8026 G55
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