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PDF LTM8029 Data sheet ( Hoja de datos )
| Número de pieza | LTM8029 | |
| Descripción | 600mA Step-Down uModule Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8029 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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Features
n Complete Switch Mode Power Supply
n Low Quiescent Current Burst Mode® Operation
5μA IQ at 12VIN to 3.3VOUT
n 600mA Output Current
n Wide Input Voltage Range: 4.5V to 36V (40VMAX)
n Output Voltage: 1.2V to 18V
n Excellent Dropout Performance
n Can Be Used As an Inverter
n Adjustable Switching Frequency: 200kHz to 2.2MHz
n Current Mode Control
n SnPb or RoHS Compliant Finish
n Tiny, Low Profile (11.25mm × 6.25mm × 3.42mm)
Surface Mount BGA Package
Applications
n Automotive Battery Regulation
n Power for Portable Products
n Distributed Supply Regulation
n Industrial Supplies
n Wall Transformer Regulation
LTM8029
36VIN, 600mA Step-Down
µModule Converter with
5µA Quiescent Current
Description
The LTM®8029 is a 36VIN, 600mA step-down µModule®
converter with 5µA quiescent current. It is an adjustable
frequency buck switching regulator that consumes only
5μA of quiescent current. The LTM8029 can accept an
input as high as 36VIN and operates at low input voltages
due to its off-time skipping capability. Burst Mode opera-
tion maintains high efficiency at low output currents while
keeping the output ripple low. The RUN pin features an
accurate threshold and the shutdown current is 0.9μA.
A power good flag signals when VOUT reaches 90% of the
programmed output voltage.
The LTM8029 is packaged in a thermally enhanced, com-
pact (11.25mm × 6.25mm) and low profile (3.42mm)
overmolded ball grid array (BGA) package. The LTM8029
is available with SnPb (BGA) or RoHS compliant terminal
finish.
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and µModule are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Typical Application
Low Quiescent Current, 5VOUT, 600mA µModule Regulator
VIN
5.6V TO 36V
LTM8029
VIN VOUT
1µF RUN
BIAS
PGOOD
RT GND FB
158k
309k
f = 800kHz
8029 TA01a
22µF
VOUT
5V
600mA
Minimum Input Voltage vs Output Current
5.8
5.7
5.6
5.5
5.4
0
100 200 300 400 500 600
OUTPUT CURRENT (mA)
8029 TA01b
For more information www.linear.com/LTM8029
8029fc
1
1 page  
Typical Performance Characteristics
TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.
Input Current vs Output Current,
8VOUT, BIAS = 5V
1000
12VIN
24VIN
36VIN
100
Input Current vs Output Current,
12VOUT, BIAS = 5V
1000
24VIN
36VIN
100
LTM8029
Input Current vs Output Current,
18VOUT, BIAS = 5V
1000
24VIN
36VIN
100
10 10 10
11 1
0.1
1
10 100
OUTPUT CURRENT (mA)
Minimum VIN vs VOUT,
IOUT = 600mA, BIAS = 5V
25
1000
8029 G10
20
15
10
5
0
0 5 10 15 20
VOUT (V)
8029 G13
I2B.I5AVSOvUsTO, uBtIpAuSt
Current,
= 5V
10 5VIN
12VIN
24VIN
36VIN
1
0.1
1
10 100
OUTPUT CURRENT (mA)
1000
8029 G11
Input Current vs VIN,
Output Short, BIAS = 5V
450
400
350
300
250
f = 800kHz
200
150
f = 400kHz
100
50
0
0 10 20 30
VIN (V)
40
8029 G14
3IB.I3AVSOvUsTO, uBtIpAuSt
Current,
= 5V
10 5VIN
12VIN
24VIN
36VIN
1
0.1
1
10 100
OUTPUT CURRENT (mA)
1000
8029 G12
Output Short-Circuit Current,
BIAS = 5V
1700
1600
1500
f = 800kHz
1400
1300
1200
f = 400kHz
1100
1000
0
10 20 30
VIN (V)
40
8029 G15
5IBVIAOSUTv,sBOIuAtSpu=t
Current,
5V
10
12VIN
24VIN
36VIN
1
0.1 0.1 0.1
0.01
1
10 100
OUTPUT CURRENT (mA)
1000
8029 G16
0.01
1
10 100
OUTPUT CURRENT (mA)
1000
8029 G17
0.01
1
For more information www.linear.com/LTM8029
10 100
OUTPUT CURRENT (mA)
1000
8029 G18
8029fc
5
5 Page 
LTM8029
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
input range and output voltage.
2. Apply the recommended CIN, COUT, RFB and RT values.
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.
The maximum frequency (and attendant RT value) at which
the LTM8029 should be allowed to switch is given in
Table 1 in the fMAX column, while the recommended fre-
quency (and RT value) for optimal efficiency over the given
input condition is given in the fOPTIMAL column.
The LTM8029 is capable of operating at low input voltages
by skipping off-times to maintain regulation. This results
in a lower operating frequency than that programmed by
the RT pin, so it may be necessary to use larger input and
output capacitors, depending upon the system require-
ments. The recommended components and VIN range
listed in Table 1 reflect an operation where off-times are
not skipped.
Capacitor Selection Considerations
The CIN and COUT capacitor values in Table 1 are the
minimum recommended values for the associated oper-
ating conditions. Applying capacitor values below those
indicated in Table 1 is not recommended, and may result
in undesirable operation. Using larger values is generally
acceptable, and can yield improved dynamic response,
if it is necessary. It is incumbent upon the user to verify
proper operation over the intended system’s line, load and
environmental conditions.
Ceramic capacitors are small, robust and have very low
ESR. However, not all ceramic capacitors are suitable.
X5R and X7R types are stable over temperature and ap-
plied voltage and give dependable service. Other types,
including Y5V and Z5U have very large temperature and
voltage coefficients of capacitance. In an application cir-
cuit they may have only a small fraction of their nominal
capacitance resulting in much higher output voltage ripple
than expected.
Ceramic capacitors are also piezoelectric. In Burst Mode
operation, the LTM8029’s switching frequency depends
on the load current, and can excite a ceramic capacitor
at audio frequencies, generating audible noise. Since the
LTM8029 operates at a lower current limit during Burst
Mode operation, the noise is typically very quiet to a ca-
sual ear. If this audible noise is unacceptable, use a high
performance electrolytic capacitor at the output. It may
also be a parallel combination of a ceramic capacitor and
a low cost electrolytic capacitor.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8029. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit.
If the LTM8029 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possi-
bly exceeding the device’s rating. This situation is easily
avoided; see the Hot-Plugging Safety section.
For more information www.linear.com/LTM8029
8029fc
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LTM8029.PDF ] | |
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