ltm8020 Linear Technology Corporation, ltm8020 Datasheet - Page 5

• Manufacturer Part Number: ltm8020
• Description: 200ma, 36v Dc/dc ?module
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
V
LTM8020’s internal regulator and to the internal power
switch. These pins must be locally bypassed with an
external, low ESR capacitor of at least 1μF.
V
An external capacitor is connected from V
most applications. Apply output load between these pins
and GND.
BIAS (Pin C3): The BIAS pin connects to the internal
boost Schottky diode and to the internal regulator. Tie to
V
than 3V otherwise. When BIAS > 3V the internal circuitry
will be powered from this pin to improve effi ciency. Main
regulator power will still come from V
IN
OUT
OUT
(Pins A1, A2): The V
(Pins A4, A5, B4, B5, C4, C5): Power Output Pins.
when V
OUT
25
20
15
10
> 3V or to another DC voltage greater
5
0
0
Temperature Rise vs Input
Voltage (Full Load, T
10
IN
INPUT VOLTAGE (V)
pins supply current to the
20
5V
OUT
3.3V
30
OUT
A
IN
= 25°C)
.
40
OUT
8020 G13
to GND in
50
INPUT CURRENT
⎯ S ⎯ H ⎯ D ⎯ N (Pin C1): The SHDN pin is used to put the LTM8020 in
shutdown mode. Tie to ground to shut down the LTM8020.
Apply 2V or more for normal operation. If the shutdown
feature is not used, tie this pin to V
GND (Pins C2, D1, D2, D3, D4, D5, E2, E3, E4, E5): The
GND connections serve as the main signal return and the
primary heatsink for the LTM8020. Tie the GND pins to
a local ground plane below the LTM8020 and the circuit
components. Return the feedback divider to this signal.
ADJ (Pin E1): The LTM8020 regulates its ADJ pin to 1.25V.
Connect the adjust resistor from this pin to GND. The value
of this adjust resistor is determined by the equation R
= 623.75/(V
the ADJ pin is open circuit if V
100mA/DIV
2V/DIV
5V/DIV
SHDN
V
OUT
Turn-On Behavior
(6V
T
A
OUT
= 25°C unless otherwise noted.
IN
, 3.3V
– 1.25), where R
OUT
50μs/DIV
, No Load)
OUT
ADJ
= 1.25V.
IN
.
8020 G14
is in kΩ. Note that
LTM8020
5
8020f
ADJ