LTM8062EVPBF LINER [Linear Technology], LTM8062EVPBF Datasheet - Page 10

• Manufacturer Part Number: LTM8062EVPBF
• Description: 32VIN, 2A ?Module Power Tracking Battery Charger
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
For most applications, the design process is straight
forward, summarized as follows:
1. Look at Table 1 and find the row that has the desired
2. Apply the recommended C
3. Connect BIAS as indicated.
While these component combinations have been tested
for proper operation, it is incumbent upon the user to
verify proper operation over the intended system’s line,
load and environmental conditions. Bear in mind that the
maximum output current is limited by junction tempera-
ture, the relationship between the input and output voltage
magnitude and polarity and other factors. Please refer to
the graphs in the Typical Performance Characteristics
section for guidance.
Table 1. Recommended Component Values and Configuration
(T
* Input bulk capacitance is required.
V
The LTM8062 is biased directly from the charger input sup-
ply through the V
currents, so a high quality low ESR decoupling capacitor is
recommended to minimize voltage glitches on V
is typically adequate for most charger applications.
LTM8062
V
10
IN
IN
A
12.75 to 32
18.25 to 32
6.25 to 32
9.75 to 32
11.5 to 32
16.5 to 32
19.5 to 32
input voltage range and battery float voltage.
9.5 to 32
RANGE (V)*
= 25°C)
11 to 32
17 to 32
19 to 32
6 to 32
6 to 32
6 to 32
Input Supply
V
14.08
14.42
BAT
7.05
12.3
12.6
13.5
3.6
4.1
4.2
4.7
7.2
8.2
8.4
9.4
IN
(V)
pin. This pin provides large switched
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
4.7μF 1206 X7R 50V
IN
C
IN
and R
ADJ
values.
R
1020
1090
1110
(kΩ)
TOP
274
312
320
357
530
549
626
642
715
942
965
ADJ1
IN
BOTTOM
. 4.7μF
R
2870
1260
1150
(kΩ)
835
464
459
417
412
383
344
340
328
332
328
ADJ2
BIAS Pin Considerations
The BIAS pin is used to provide drive power for the in-
ternal power switching stage and operate other internal
Reverse Protection Diode
The LTM8062 integrates a high voltage power Schottky
diode to provide input reverse voltage protection. The
anode of this diode is connected to V
is connected to V
at each end; please see the Block Diagram.
Input Supply Voltage Regulation
The LTM8062 contains a voltage monitor pin that enables
programming a minimum operational voltage. Connect-
ing a resistor divider from V
programming of minimum input supply voltage, typically
used to program the peak power voltage for a solar panel.
Maximum charge current is reduced when the V
is below the regulation threshold of 2.7V.
If the V
cannot provide enough power to satisfy the requirements
of an LTM8062 charger, the input supply voltage will col-
lapse. A minimum operating supply voltage can thus be
programmed by monitoring the supply through a resistor
divider, such that the desired minimum voltage corresponds
to 2.7V at the V
mum output charge current to maintain the voltage on
V
Programming of the desired minimum voltage is ac-
complished by connecting a resistor divider as shown in
Figure 3. The ratio of R
voltage (V
If the voltage regulation feature is not used, connect the
V
INREG
INREG
R
IN1
/R
INPUT SUPPLY
INREG
at or above 2.7V.
pin to V
Figure 3. Resistive Divider Sets Minimum V
IN2
IN(MIN)
= (V
function is not used, and if the input supply
INREG
IN
IN
) is:
IN(MIN)
.
. There is a small mount of capacitance
R
R
IN1
IN2
pin. The LTM8062 servos the maxi-
/2.7) – 1
IN1
/R
IN
IN2
to the V
V
V
for a desired minimum
IN
INREG
INA
LTM8062
INREG
, and the cathode
8062 F03
pin enables
IN
INREG
8062f
pin