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参数资料
| 型号： | LTC3542EDC-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 2 MM, LEAD FREE, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件页数： | 2/16页 |
| 文件大小： | 235K |
| 代理商： | LTC3542EDC-1#PBF |
LTC3542-1
10
35421f
design. An additional 0.1μF to 1μF ceramic capacitor is
also recommended on VIN for high frequency decoupling,
when not using an all ceramic capacitor solution.
Output Capacitor (COUT) Selection
The selection of COUT is driven by the required ESR to
minimize voltage ripple and load step transients. Typically,
once the ESR requirement is satised, the RMS current
rating generally far exceeds the IRIPPLE(P-P) requirement,
except for an all ceramic solution. The output ripple (
ΔVOUT)
is determined by:
ΔΔ
V
I
ESR
C
OUT
L
OUT
≈+
1
8
O
where fO is the switching frequency, COUT is the output
capacitance and
ΔIListheinductorripplecurrent.Foraxed
output voltage, the output ripple is highest at maximum
input voltage since
ΔIL increases with input voltage.
If tantalum capacitors are used, it is critical that the capaci-
tors are surge tested for use in switching power supplies.
An excellent choice is the AVX TPS series of surface mount
tantalums, available in case heights ranging from 2mm to
4mm. These are specially constructed and tested for low
ESR so they give the lowest ESR for a given volume. Other
capacitor types include Sanyo POSCAP, Kemet T510 and
T495 series, and Sprague 593D and 595D series. Consult
the manufacturer for other specic recommendations.
Ceramic Input and Output Capacitors
Higher value, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high
ripple current rating, high voltage rating and low ESR
are tempting for switching regulator use. However, the
ESR is so low that it can cause loop stability problems.
Since the LTC3542-1’s control loop does not depend on
the output capacitor’s ESR for stable operation, ceramic
capacitors can be used to achieve very low output ripple
and small circuit size. X5R or X7R ceramic capacitors are
recommended because these dielectrics have the best
temperature and voltage characteristics of all the ceramics
for a given value and size.
Great care must be taken when using only ceramic input
and output capacitors. When a ceramic capacitor is used
at the input and the power is being supplied through long
wires, such as from a wall adapter, a load step at the output
can induce ringing at the VIN pin. At best, this ringing can
couple to the output and be mistaken as loop instability.
At worst, the ringing at the input can be large enough to
damage the part. For more information, see Application
Note 88. The recommended capacitance value to use is
10μF for both input and output capacitors.
Table 1. Representative Surface Mount Inductors
MANUFACTURER
PART NUMBER
VALUE
(μH)
MAX DC
CURRENT
(A)
DCR
(
Ω)
SIZE (mm3)
Sumida
CDRH2D11-2RM
2.2
0.780
0.098
3.2
× 3.2 × 1.2
CDRH3D16
2.2
1.2
0.075
3.8
× 3.8 × 1.8
CMD4D11
2.2
0.95
0.116
4.4
× 5.8 × 1.2
CDH2D09B
3.3
0.85
0.15
2.8
× 3 × 1
CLS4D09
4.7
0.75
0.15
4.9
× 4.9 × 1
Murata
LQH32CN
2.2
0.79
0.097 2.5
× 3.2 × 1.55
LQH43CN
4.7
0.75
0.15
4.5
× 3.2 × 2.6
TDK
IVLC453232
2.2
0.85
0.18
4.8
× 3.4 × 3.4
VLF3010AT-
2R2M1R0
2.2
1.0
0.12
2.8
× 2.6 × 1
APPLICATIONS INFORMATION
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3547BIDDB#TRM | 0.7 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3547BEDDB-1#PBF | 0.7 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3547BIDDB#PBF | 0.7 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3560ES6 | 2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3560ES6#TR | 2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3542EDC-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, 2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter |
| LTC3542EDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, 2.25MHz Synchronous Step-Down DC/DC Converter |
| LTC3542EDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, 2.25MHz Synchronous Step-Down DC/DC Converter |
| LTC3542ES6#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.25MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.25MHZ, 500mA, TSOT-23-6; Primary Input Voltage:5.5V; No. of Outputs:1; Output Current:500mA; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-TSOT-23 ;RoHS Compliant: Yes |
| LTC3542ES6#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 6-Pin TSOT-23 T/R |
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