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PDF LTM8052A Data sheet ( Hoja de datos )
| Número de pieza | LTM8052A | |
| Descripción | 2-Quadrant CVCC Step-Down uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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 Compact (11.25mm × 15mm × 2.82mm) Surface
Mount LGA and (11.25mm × 15mm × 3.42mm)
BGA Packages
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
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.
LTM8052/LTM8052A
36VIN, 5A, 2-Quadrant
CVCC Step-Down
µModule Regulator
Description
The LTM®8052/LTM8052A 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/LTM8052A supports an output voltage
range of 1.2V to 24V. The LTM8052/LTM8052A 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. LTM8052 features a 125% output overvoltage
protection, while LTM8052A does not, allowing operation
when the output is above the target regulation point.
The LTM8052/LTM8052A is packaged in a compact
(11.25mm × 15mm × 2.82mm) overmolded land grid ar-
ray (LGA) and ball grid array (BGA) package suitable for
automated assembly by standard surface mount equip-
ment. The LTM8052/LTM8052A are available with SnPb
(BGA) or RoHS compliant terminal finish.
PART NUMBER
LTM8052
LTM8052A
LTM8026
BEST FOR
Sinking and sourcing output current for voltage
regulation primarily.
Sinking and sourcing output current for current
regulation primarily.
Sourcing more than 3A of output current.
(Less than 3A maximum consider LTM8025.)
Click to view associated TechClip Videos.
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 LTM8052A MAINTAINS CURRENT
3.0
REGULATION
LTM8052 TURNS OFF AT
OUTPUT OVERVOLTAGE
2.5
2.0
1.5
1.0
0.5
0
–10
–5 0 5
LOAD CURRENT (A)
10
8052 TA01b
For more information www.linear.com/LTM8052
8052ff
1
1 page  
LTM8052/LTM8052A
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
1.2VOUT Efficiency
90
85
80
75
70
65
60 6VIN
55
12VIN
24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G01
2.5VOUT Efficiency
95
90
85
80
75
70
65
60
6VIN
12VIN
55 24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G04
8VOUT Efficiency
100
95
90
85
80
75
70
65
60
10VIN
12VIN
55
24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G07
1.5VOUT Efficiency
90
85
80
75
70
65
60 6VIN
55
12VIN
24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G02
3.3VOUT Efficiency
95
90
85
80
75
70
65
60
6VIN
12VIN
55 24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G05
12VOUT Efficiency
100
95
90
85
80
75
70
65
60 15VIN
55
24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G08
For more information www.linear.com/LTM8052
1.8VOUT Efficiency
95
90
85
80
75
70
65
60
6VIN
12VIN
55 24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G03
5VOUT Efficiency
100
95
90
85
80
75
70
65
60
8VIN
12VIN
55
24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G06
18VOUT Efficiency
100
95
90
85
80
75
70
65
60 22VIN
55
24VIN
36VIN
50
0 1 2 3 45
OUTPUT CURRENT (A)
8052 G09
8052ff
5
5 Page 
LTM8052/LTM8052A
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
CTL_I Voltage vs Maximum
Output Current, CTL_T = 2V
6
4
2
0
–2
–4
–6
–8
0 0.25 0.5 0.75 1 1.25 1.5
CTL_I VOLTAGE (V)
8052 G54
CTL_T Voltage vs Maximum
Output Current, CTL_I = 2V
6
4
2
0
–2
–4
–6
–8
0 0.25 0.5 0.75 1 1.25 1.5
CTL_T VOLTAGE (V)
8052 G55
Pin Functions
VOUT (Bank 1): Power Output Pins. Apply the output filter
capacitor and the output load between these pins and
GND pins. When reverse current is being driven into the
LTM8052/LTM8052A’s output by the load, the energy is
delivered back through the LTM8052/LTM8052A and out
to the VIN pins. Care must be taken to prevent excessive
voltage if other devices on the VIN bus cannot absorb this
energy. See Input Precautions in the Applications Infor-
mation section for more details and circuit suggestions.
GND (Bank 2): Tie these GND pins to a local ground plane
below the LTM8052/LTM8052A and the circuit compo-
nents. In most applications, the bulk of the heat flow out
of the LTM8052/LTM8052A 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 Ther-
mal Considerations sections for more details. Return the
feedback divider (RADJ) to this net.
VIN (Bank 3): The VIN pins supply current to the LTM8052/
LTM8052A’s internal regulator and to the internal power
switches. This pin must be locally bypassed with an ex-
ternal, low ESR capacitor; see Table 1 for recommended
values.
CTL_T(PinD8):Connectaresistor/NTCthermistor network
to the CTL_T pin to reduce the maximum regulated output
current of the LTM8052/LTM8052A in response to tem-
perature. The maximum control voltage is 1.5V. If this
function is not used, tie this pin to VREF .
CTL_I (Pin E8): The CTL_I pin reduces the maximum
regulated output current of the LTM8052/LTM8052A. The
maximum control voltage is 1.5V. If this function is not
used, tie this pin to VREF .
VREF (Pin F8): Buffered 2V Reference Capable of 0.5mA
Drive. It is valid when VIN > 6V and RUN is active high.
RT (Pin G8): The RT pin is used to program the switching
frequency of the LTM8052/LTM8052A by connecting a re-
sistor from this pin to ground. The Applications Information
section of the data sheet includes a table to determine the
resistance value based on the desired switching frequency.
When using the SYNC function, apply a resistor value
equivalent to 20% lower than the clock frequency applied
to the SYNC pin. Do not leave this pin open.
COMP (Pin H8): Compensation Pin. This pin is generally
not used. The LTM8052/LTM8052A is internally compen-
sated, but some rare situations may arise that require a
modification to the control loop. This pin connects directly
to the input PWM comparator of the LTM8052/LTM8052A.
In most cases, no adjustment is necessary. If this function
is not used, leave this pin open.
For more information www.linear.com/LTM8052
8052ff
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM8052A.PDF ] | |
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