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参数资料
| 型号： | LTC3421EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.5A 24QFN |
| 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 ~ 3MHz |
| 电流 - 输出： | 1.5A |
| 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
LTC3421
OPERATIO
disconnect, there must not be any external Schottky
diodes connected between the SW pins and V OUT .
Note: Board layout is extremely critical to minimize volt-
age overshoot on the SW pins due to stray inductance.
Keep the output filter capacitors as close as possible to the
APPLICATIO S I FOR ATIO
COMPONENT SELECTION
V OUT pins and use very low ESR/ESL ceramic capacitors,
tied to a good ground plane. In V OUT > 4.3V applications,
a Schottky diode is required from the switch nodes to V OUT
to limit the peak switch voltage to less than 6V unless
some form of external snubbing is employed. (See 5V
Applications section.)
where
f = Operating Frequency in MHz
Ripple = Allowable Inductor Current Ripple (Amps
Peak-Peak)
1 FB
24
V C
23
LBI
22
LBO
21
V IN
20 19
V OUT V OUT
V OUTS 18
V OUT
V IN
V IN(MIN) = Minimum Input Voltage
V OUT(MAX) = Maximum Output Voltage
2 SHDN
3 V REF
4 ENB
5 R T
V OUT 17
SW 16
SW 15
SW 14
The inductor current ripple is typically set to 20% to 40%
of the maximum inductor current.
For high efficiency, choose an inductor with high fre-
quency core material, such as ferrite, to reduce core loses.
6 SS PGND 13
SYNC I LIM BURST GND PGND PGND
7 8 9 10 11 12
GND
MULTIPLE VIAS
TO GROUND
PLANE
The inductor should have low ESR (equivalent series
resistance) to reduce the I 2 R losses and must be able to
handle the peak inductor current without saturating. Molded
chokes or chip inductors usually do not have enough core
to support peak inductor currents in the 1A to 4A region.
3421 F01
Figure 1. Recommended Component Placement. Traces Carrying
High Current are Direct (PGND, SW, V OUT ). Trace Area at FB and
V C are Kept Low. Lead Length to Battery Should be Kept Short.
V IN and V OUT Ceramic Capacitors Should be as Close to the IC
Pins as Possible
Inductor Selection
The high frequency operation of the LTC3421 allows the
use of small surface mount inductors. The minimum
To minimize radiated noise, use a toroidal or shielded
inductor. See Table 1 for suggested inductor suppliers and
Table 2 for a list of capacitor suppliers.
Table 1. Inductor Vendor Information
SUPPLIER PHONE FAX WEB SITE
Coilcraft (847) 639-6400 (847) 639-1469 www.coilcraft.com
Coiltronics (561) 241-7876 (516) 241-9339
Murata USA: USA: www.murata.com
(814) 237-1431 (814) 238-0490
(800) 831-9172
inductance value is proportional to the operating fre-
quency and is limited by the following constraints:
Sumida
USA:
(847) 956-0666
Japan:
USA: www.sumida.com
(847) 956-0702
Japan:
L >
3
f
and L >
V IN ( MIN ) ? ( V OUT ( MAX ) – V IN ( MIN )
f ? Ripple ? V OUT ( MAX )
)
TDK
TOKO
81-3-3607-5111 81-3-3607-5144
(847) 803-6100 (847) 803-6296 www.component.tdk.com
(847) 297-0070 (847) 669-7864 www.toko.com
3421f
11
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| LTC3422EDD#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 1.5A 10DFN 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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