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| 型号： | LT3640EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK FIX/ADJ DL 28TSSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 2 |
| 输出电压： | 1.8V，3.3V，可调 |
| 输入电压： | 2.5 V ~ 35 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 1.1A，1.3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
LT3640
APPLICATIONS INFORMATION
Output Capacitors and Output Ripple
Table 3. Capacitor Vendors
C OUT 1 =
Theoutputcapacitorhastwoessentialfunctions.Insteady
state, it determines the output voltage ripple. In transient,
it stores energy in order to satisfy transient loads and
stabilize the control loop. Ceramic capacitors have low
equivalent series resistance (ESR) and provide the best
ripple performance. A good starting value is:
150
V OUT ? f S
where f S is in MHz, and C OUT is the recommended output
capacitance in μF. Use X5R or X7R types. This choice will
provide low output ripple and good transient response.
PART SERIES
Ceramic, Polymer, Tantalum
Ceramic, Tantalum
Ceramic, Polymer, Tantalum
Ceramic
Ceramic, Tantalum
Ceramic
VENDOR
Panasonic
www.panasonic.com
Kemet
www.kemet.com
Sanyo
www.sanyovideo.com
Murata
www.murata.com
AVX
www.avxcorp.com
Taiyo Yuden
www.taiyo-yuden.com
C OUT 2 =
I D ( AVG ) =
Agoodstartingvalueforthelowvoltagechanneloutput
capacitor is:
100
V OUT 2 ? f S
In the case where V IN2 is connected to the high voltage
channel output, the high voltage channel output capacitor
can be used as the low voltage channel input capacitor.
The required V IN2 input capacitor value is usually smaller
than the high voltage output capacitor.
Low ESR ceramic capacitors for V IN2 input and high volt-
age channel output could form resonant tank and cause
jitter in certain operating area. Avoid V IN2 input capacitor
if possible.
When choosing a capacitor, look carefully through the
data sheet to find out what the actual capacitance is under
operating conditions (applied voltage and temperature).
A physically larger capacitor or one with a higher voltage
rating may be required. High performance tantalum or
electrolytic capacitors can be used for the output capacitor.
Low ESR is important, so choose one that is intended for
use in switching regulators. Table 3 lists several capacitor
vendors.
Catch Diode
The high voltage channel requires an external catch diode
to conduct current during switch off-time. Average forward
current in normal operation can be calculated from:
I OUT ( V IN ? V OUT )
V IN
where I OUT is the output load current. Use a 1A or 2A
rated Schottky diode. Peak reverse voltage is equal to the
regulator input voltage. Use a diode with a reverse voltage
rating greater than the input voltage. Table 4 lists several
Schottky diodes and their manufacturers.
Table 4. Diode Vendors
V R I AVE V F AT 1A V F AT 2A
PART NUMBER (V) (A) (MV) (MV)
On Semiconductor
MBRM120E 20 1 530 595
MBRM140 40 1
Diodes Inc.
B120 20 1 500
B130 30 1 500
B220 20 2 500
B230 30 2 500
DFLS240L 40 2 500
International Rectifier
10BQ030 30 1 420 470
20BQ030 30 2 470
3640f
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| LT3640EUFD#PBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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