参数资料
| 型号： | LTC3428EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 4A 10DFN |
| 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： | 1.6 V ~ 5.25 V |
| 输入电压： | 1.6 V ~ 4.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3428
APPLICATIONS INFORMATION
Table 2. Capacitor Vendor Information
If the junction temperature gets too high, the LTC3428 will
SUPPLIER
PHONE
FAX
WEBSITE
stop all switching until the junction temperature drops
AVX
Sanyo
TDK
Murata
(803) 448-9411 (803) 448-1943 www.avxcorp.com
(619) 661-9322 (619) 661-1055 www.sanyovideo.com
(847) 803-6100 (847) 803-6296 www.component.tdk.com
(814) 237-1431 (814) 238-0490 www.murata.com
to safe levels. The typical over temperature threshold is
150°C.
Closing the Feedback Loop
Taiyo Yuden (408) 573-4150 (408) 573-4159 www.t-yuden.com
Output Diode Selection
For high ef?ciency, a fast switching diode with low reverse
leakage and a low forward drop is required. Schottky diodes
are recommended for their low forward drop and fast
switching times. When selecting a diode, it is important to
The LTC3428 uses current mode control with internal,
adaptive slope compensation. Current mode control
eliminates the 2nd order pole in the loop response of voltage
mode converters due to the inductor and output capacitor,
simplifying it to a single pole response. The product of the
modulator control to output DC gain and the error amp
open-loop gain equals the DC gain of the system.
2 ? V IN
remember that the average diode current in a b oos t
converter is equal to the average load current: I D = I LOAD
When selecting a diode, make sure that the peak forward
current and average power dissipation ratings meet
the application requirements. See Table 3 for a list of
G DC = G CONTROL ? G EA ?
G CONTROL =
I OUT
V REF
V OUT
Schottky diode manufacturers. Example diodes are Philips
PMEG1020, PMEG2010, On-Semi MBRA210, IR 10BQ015,
Microsemi UPS120E, UPS315.
G EA ≈ 100
The output ?lter pole is given by:
Table 3. Diode Vendor Information
SUPPLIER PHONE FAX
WEBSITE
f POLE =
I OUT
π ? V OUT ? C OUT
Hz
Philips +31 40 27 24825
Microsemi (949) 221-7100
On-Semi (602) 244-6600
International (310) 469-2161
Recti?er
www.philips.com
(949)756-0308 www.microsemi.com
www.microsemi.com
(310) 322-3332 www.irf.com
where C OUT is the output ?lter capacitor value. The output
?lter zero is given by:
1
f ZERO = Hz
2 ? π ? R ESR ? C OUT
Thermal Considerations
To deliver maximum power, it is necessary to provide a
good thermal path to dissipate the heat generated within
the LTC3428’s package. The large thermal pad on the IC
where R ESR is the output capacitor equivalent series
resistance.
A complication of the boost converter topology is the right
half plane (RHP) zero and is given by:
underside can accomplish this requirement. Use multiple
PC board vias to conduct heat from the IC and to a copper
plane that has as much area as possible.
f RHP =
2
V IN ? R O
2 ? π ? L ? V O
2
Hz
3428fb
8
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