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PDF LTM8052 Data sheet ( Hoja de datos )
| Número de pieza | LTM8052 | |
| Descripción | 2-Quadrant CVCC Step-Down uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8052 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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Features
n Complete Step-Down Switch Mode Power Supply
n CVCC: Constant-Voltage Constant-Current
n 2-Quadrant: Sources and Sinks Output Current
n Adjustable Output Current
n Wide Input Voltage Range: 6V to 36V
n 1.2V to 24V Output Voltage
n Forced Continuous Operation
n Selectable Switching Frequency: 100kHz to 1MHz
n (e4) RoHS Compliant Package with Gold Pad Finish
n Programmable Soft-Start
n Tiny, Low Profile (11.25mm × 15mm × 2.82mm)
Surface Mount LGA Package
Applications
n Constant-Frequency Voltage Regulation Even at
No Load
n Peltier Driver
n Battery Tester
n Battery/Supercap Charging and Cell Balancing
n Motor Drive Power Regulator
n High Power LED Drive
LTM8052
36VIN, 5A, 2-Quadrant
CVCC Step-Down
µModule Regulator
Description
The LTM®8052 is a 36VIN, 5A, 2-quadrant 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 LTM8052
supports an output voltage range of 1.2V to 24V. The
LTM8052 is able to sink or source current to maintain
voltage regulation up to the positive and negative current
limits. This output current limit can be set by a control
voltage, a single resistor or a thermistor.
The LTM8052 is packaged in a thermally-enhanced, com-
pact (11.25mm × 15mm × 2.82mm) RoHS compliant,
overmolded land grid array (LGA) package suitable for au-
tomated assembly by standard surface mount equipment.
PART NUMBER
LTM8052
LTM8026
BEST FOR
Sinking and Sourcing Output Current
Sourcing more than 3A of output current.
(Less than 3A maximum consider LTM8025.)
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule 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
±5A, 2.5V (2-Quadrant) µModule Voltage Regulator
VIN*
6V TO 36V
10µF
OPTIONAL
INPUT
PROTECTION
510k
LTM8052
VIN VOUT
RUN
SS
SYNC
VREF
CTL_I
COMP CTL_T
RT GND ADJ
90.9k
9.09k
VOUT
2.5V
±5A
100µF
+
330µF
*INPUT VOLTAGE PROTECTION MAY BE NECESSARY WHEN THE
8052 TA01a
LTM8052 IS SINKING CURRENT (SEE APPLICATIONS INFORMATION)
Output Voltage vs Output Current
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–10
–5 0 5
LOAD CURRENT (A)
10
8052 TA01b
8052fa
1
1 page  
LTM8052
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
–8VOUT Efficiency
90
–12VOUT Efficiency
90
Input Current vs Output Current
1.2VOUT
1.0
85 85 0.8
80 80 0.6
75 75 0.4
70 70 0.2
65 65
0
60
55
50
0
12VIN
24VIN
28VIN
123 4
OUTPUT CURRENT (A)
5
8052 G13
60
55
50
0
12VIN
24VIN
123 4
OUTPUT CURRENT (A)
5
8052 G14
–0.2
–0.4
–0.6
–8 –6
–4 –2 0 2
OUTPUT CURRENT (A)
12VIN
24VIN
36VIN
46
8052 G15
Input Current vs Output Current
1.5VOUT
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–8 –6
–4 –2 0 2
OUTPUT CURRENT (A)
12VIN
24VIN
36VIN
46
8052 G16
Input Current vs Output Current
1.8VOUT
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–8
–6
–4 –2 0 2
OUTPUT CURRENT (A)
12VIN
24VIN
36VIN
46
8052 G17
Input Current vs Output Current
2.5VOUT
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–8 –6
–4 –2 0 2
OUTPUT CURRENT (A)
12VIN
24VIN
36VIN
46
8052 G18
Input Current vs Output Current
3.3VOUT
2
1
0
–1
–2
–8 –6 –4 –2 0 2
OUTPUT CURRENT (A)
12VIN
24VIN
36VIN
46
8052 G19
Input Current vs Output Current
5VOUT
3
2
1
0
–1
–2
–3
–8 –6
–4 –2 0 2
OUTPUT CURRENT (A)
12VIN
24VIN
36VIN
46
8052 G20
Input Current vs Output Current
8VOUT
5
4
3
2
1
0
–1
–2
–3
–4
–5
–8
–6
–4 –2 0 2
OUTPUT CURRENT (A)
12VIN
24VIN
36VIN
46
8052 G21
8052fa
5
5 Page 
Block Diagram
VIN
0.2µF
LTM8052
2.2µH RSENSE
10k
VOUT
2.2µF
RUN
SS
SYNC
VREF
CTL_I
CTL_T
COMP
10k
2.2nF
CURRENT
MODE
CONTROLLER
VIN
INTERNAL
REGULATOR
GND RT
ADJ
8026 BD
Operation
The LTM8052 is a standalone nonisolated constant-voltage,
constant-current step-down switching DC/DC power sup-
ply that can deliver up to 5A of positive or 6A of negative
output current. This µModule regulator provides a precisely
regulated output voltage programmable via one external
resistor from 1.2V to 24V. The input voltage range is 6V
to 36V. Given that the LTM8052 is a step-down converter,
make sure that the input voltage is high enough to support
the desired output voltage and load current.
The LTM8052 is a 2-quadrant device, meaning that it
can both source and sink current in order to regulate its
output voltage. Most traditional voltage regulators are one
quadrant; that is, they only source current. If the load, for
whatever reason, forces current into a traditional regulator,
the output voltage will typically rise. In a similar situation,
the LTM8052 will sink current to keep the output voltage
in regulation.
It should be clear that the above situation is only possible
if the load is providing energy to the LTM8052 output.
The LTM8052 will be able to maintain the output voltage
at the target regulation point as long as the current from
the load does not exceed its negative current limit. If
the current does exceed the negative current limit, the
LTM8052 output will start to rise. If the output continues
to rise, the LTM8052’s output overvoltage protection
circuitry will turn off the internal power switches, and
the output will be free to rise. If this voltage rises above
the LTM8052 input voltage, current will flow through an
internal diode, and the output will be clamped to a diode
drop above the input.
8052fa
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11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTM8052.PDF ] | |
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