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PDF LTM8026 Data sheet ( Hoja de datos )
| Número de pieza | LTM8026 | |
| Descripción | 5A CVCC Step-Down uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8026 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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LTM8026
36VIN, 5A CVCC Step-Down
µModule Regulator
Features
n Complete Step-Down Switch Mode Power Supply
n Constant-Voltage Constant-Current Operation
n Selectable Output Current Up to 5A
n Parallelable for Increased Output Current, Even
from Different Voltage Sources
n Wide Input Voltage Range: 6V to 36V
n 1.2V to 24V Output Voltage
n Selectable Switching Frequency: 100kHz to 1MHz
n SnPb or RoHS Compliant Finish
n Programmable Soft-Start
n (11.25mm × 15mm × 2.82mm) LGA and (11.25mm
× 15mm × 3.42mm BGA Packages
Applications
n SuperCap Charging
n General Purpose Industrial
n Extreme Short-Circuit Protection or Accurate Output
Current Limit
n µController-Based Battery Charging
n High Power LED Drive
n Multiple Input, Single Output Voltage Conversion
Description
The LTM®8026 is a 36VIN, 5A constant-voltage, constant-
current (CVCC) step-down µModule® regulator. Included in
the package are the switching controller, power switches,
inductor and support components. Operating over an
input voltage range of 6V to 36V, the LTM8026 supports
an output voltage range of 1.2V to 24V. CVCC operation
allows the LTM8026 to accurately regulate its output
current up to 5A over the entire output range. The output
current can be set by a control voltage, a single resistor or
a thermistor. Only resistors to set the output voltage and
frequency and the bulk input and output filter capacitors
are needed to finish the design.
The LTM8026 is packaged in a thermally-enhanced,
compact (11.25mm × 15mm) overmolded land grid ar-
ray (LGA) and ball grid array (BGA) packages suitable for
automated assembly by standard surface mount equip-
ment. The LTM8026 is available in SnPb (BGA) or RoHS
compliant terminal finish.
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 7199560, 7321203 and others pending.
Typical Application
Typical Application
VIN
6V TO 36V
10µF
510k
LTM8026
VIN VOUT
RUN
SS
SYNC
VREF
CTL_I
COMP CTL_T
RT GND ADJ
90.9k
9.09k
VOUT
2.5V
5A
+
100µF
330µF
8026 TA01a
VOUT vs IOUT, 12VIN
3.0
2.5
2.0
1.5
1.0
0.5
0
0123456
OUTPUT CURRENT (A)
8026 TA01b
For more information www.linear.com/LTM8026
8026fc
1
1 page  
LTM8026
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.
v2s4VOOuUtpT uEtffCicuirernecnyt
100
v–s3.O3uVtOpUuTt
Efficiency
Current
90
v–s5VOOuUtpT uEtffCicuirernecnyt
90
95 85 85
80 80
90 75 75
85
80
75 28VIN
36VIN
70
012345
OUTPUT CURRENT (A)
8026 G10
70
65
60
12VIN
55 24VIN
33VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8026 G11
70
65
60
55
50
0
12VIN
24VIN
31VIN
123 4
OUTPUT CURRENT (A)
5
8026 G12
v–s8VOOuUtpT uEtffCicuirernecnyt
90
85
80
75
–vs12OVuOtpUuTtECffuicrrieennct y
90
85
80
Input Current vs Output Current
1.2VOUT
1.6 6VIN
1.4
12VIN
24VIN
1.2 36VIN
1.0
70
65
60
55
50
0
12VIN
24VIN
28VIN
123 4
OUTPUT CURRENT (A)
5
8026 G13
Input Current vs Output Current
1.5VOUT
1.8 6VIN
1.6 12VIN
24VIN
1.4 36VIN
1.2
1.0
0.8
0.6
0.4
0.2
0
0 1 2 3 45
OUTPUT CURRENT (A)
8026 G16
75
70
65
12VIN
60 24VIN
0 0.5 1 1.5 2 2.5 3 3.5
OUTPUT CURRENT (A)
8026 G14
Input Current vs Output Current
1.8VOUT
2.0 6VIN
1.8 12VIN
1.6
24VIN
36VIN
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0123 4
OUTPUT CURRENT (A)
5
8026 G17
0.8
0.6
0.4
0.2
0
0 1 2 3 45
OUTPUT CURRENT (A)
8026 G15
Input Current vs Output Current
2.5VOUT
3.0 6VIN
2.5
12VIN
24VIN
36VIN
2.0
1.5
1.0
0.5
0
01 2 3 4
OUTPUT CURRENT (A)
5
8026 G18
For more information www.linear.com/LTM8026
8026fc
5
5 Page 
LTM8026
Pin Functions
SS (Pin J8): The Soft-Start Pin. Place an external capacitor
to ground to limit the regulated current during start-up
conditions. The soft-start pin has an 11µA charging current.
ADJ (Pin K8): The LTM8026 regulates its ADJ pin to 1.19V.
Connect the adjust resistor from this pin to ground. The
value of RADJ is given by the equation:
RADJ
=
11.9
VOUT – 1.19
where RADJ is in kΩ.
RUN (Pin L6): The RUN pin acts as an enable pin and
turns on the internal circuitry. The RUN pin is internally
clamped, so it may be pulled up to a voltage source that is
higher than the absolute maximum voltage of 6V through a
resistor, provided the pin current does not exceed 100µA.
Do not leave this pin open. It may also be used to imple-
ment a precision UVLO. See the Applications Information
section for details.
SYNC (Pin L7): Frequency Synchronization Pin. This pin
allows the switching frequency to be synchronized to an
external clock. The RT resistor should be chosen to oper-
ate the internal clock at 20% lower than the SYNC pulse
frequency. This pin should be grounded when not in use.
Do not leave this pin floating. When laying out the board,
avoid noise coupling to or from the SYNC trace. See the
Synchronization section in Applications Information.
Block Diagram
VIN
0.2µF
2.2µH RSENSE
10k
VOUT
2.2µF
RUN
SS
SYNC
VREF
CTL_I
CTL_T
COMP
CURRENT
MODE
CONTROLLER
VIN
INTERNAL
REGULATOR
GND RT
For more information www.linear.com/LTM8026
ADJ
8026 BD
8026fc
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTM8026.PDF ] | |
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