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参数资料
| 型号： | LTC3425EUH#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 5A 32QFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.4 V ~ 5.25 V |
| 输入电压： | 0.5 V ~ 4.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 2MHz |
| 电流 - 输出： | 5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
LTC3425
APPLICATIO S I FOR ATIO
The ESR (equivalent series resistance) is usually the most
dominant factor for ripple in most power converters. The
ripple due to capacitor ESR is given by:
V RCESR = I P ? C ESR
where C ESR = Capacitor Series Resistance
The ESL (equivalent series inductance) is also an impor-
tant factor for high frequency converters. Using small,
surface mount ceramic capacitors, placed as close as
possible to the V OUT pins, will minimize ESL.
Low ESR/ESL capacitors should be used to minimize
output voltage ripple. For surface mount applications, AVX
TPS Series tantalum capacitors, Sanyo POSCAP or X5R
type ceramic capacitors are recommended.
In all applications, a minimum of 1 μ F, low ESR ceramic
capacitor should be placed as close to each of the four
V OUT pins as possible, and grounded to a local ground
plane.
Input Capacitor Selection
The input filter capacitor reduces peak currents drawn
from the input source and reduces input switching noise.
Since the IC can operate at voltages below 0.5V once the
output is regulated (as long as SHDN is above 0.65V), the
demand on the input capacitor to lower ripple is much less.
Taiyo Yuden offers very low ESR capacitors, for example
the 2.2 μ F in a 0603 case (JMK107BJ22MA). See Table 3
for a list of capacitor manufacturers for input and output
capacitor selection.
Table 3. Capacitor Vendor Information
voltage from exceeding its maximum rating during the
break-before-make time. Surface mount diodes, such as
the MBR0520L or equivalent, must be used and must be
located very close to the pins to minimize stray inductance.
Two example application circuits are shown in Figures 7
and 8, one with output disconnect and one without.
Operating Frequency Selection
There are several considerations in selecting the operat-
ing frequency of the converter. The first is, which are the
sensitive frequency bands that cannot tolerate any spec-
tral noise? For example, in products incorporating RF
communications, the 455kHz IF frequency is sensitive to
any noise, therefore switching above 600kHz is desired.
Some communications have sensitivity to 1.1MHz, and
in that case, a 1.5MHz converter frequency may be
employed.
The second consideration is the physical size of the
converter. As the operating frequency goes up, the induc-
tor and filter capacitors go down in value and size. The
trade off is in efficiency, since the switching losses in-
crease proportionally with frequency.
Thermal Considerations
To deliver the power that the LTC3425 is capable of, it is
imperative that a good thermal path be provided to dissi-
pate the heat generated within the package. This can be
accomplished by taking advantage of the large thermal
pad on the underside of the IC. It is recommended that
multiple vias in the printed circuit board be used to
conduct heat away from the IC and into a copper plane with
SUPPLIER
AVX
Sanyo
TDK
Murata
PHONE
(803) 448-9411
(619) 661-6322
(847) 803-6100
USA:
(814) 237-1431
FAX
(803) 448-1943
(619) 661-1055
(847) 803-6296
USA:
(814) 238-0490
WEB SITE
www.avxcorp.com
www.sanyovideo.com
www.component.tdk.com
www.murata.com
as much area as possible. In the event that the junction
temperature gets too high, the peak current limit will
automatically be decreased. If the junction temperature
continues to rise, the part will go into thermal shutdown,
and all switching will stop until the temperature drops.
(800) 831-9172
Taiyo Yuden (408) 573-4150
(408) 573-4159 www.t-yuden.com
Closing the Feedback Loop
The LTC3425 uses current mode control with internal
Applications Where V OUT > 4.3V
Due to the very high slew rates associated with the switch
nodes, Schottky diode clamps are required in any applica-
tion where V OUT can exceed 4.3V to prevent the switch
adaptive slope compensation. Current mode control elimi-
nates the 2nd order filter, due to the inductor and output
capacitor exhibited in voltage mode controllers, and sim-
plifies it to a single pole filter response. The product of the
3425f
18
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