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| 型号： | LTC3499BEDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 0.75A 8DFN |
| 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 V ~ 6 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 750mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3499/LTC3499B
APPLICATIONS INFORMATION
PCB LAYOUT GUIDELINES
The high speed operation of the LTC3499/LTC3499B
demand careful attention to board layout. Advertised per-
formance will not be achieved with careless layout. Figure 2
shows the recommended component placement. A large
copper area will help to lower the chip temperature. Traces
carrying high current (SW, V OUT , GND) are kept short.
The lead length to the battery should be kept as short as
possible. The V IN and V OUT ceramic capacitors should be
placed as close to the IC pins as possible.
The inductor current ripple is typically set to 20% to 40%
of the maximum inductor current. For high efficiency,
choose an inductor with high frequency core material,
such as ferrite, to reduce core losses. The inductor should
have low ESR (equivalent series resistance) to reduce the
I 2 R power losses, and must be able to handle the peak
inductor current without saturating. To minimize radiated
noise, use a toroidal or shielded inductor. See Table 1 for
some suggested inductor suppliers.
Table 1. Inductor Vendor Information
SHDN
EXPOSED PAD FOR DD8
1 8
VC
C C1
C C2
RZ
PART NUMBER
MSS5131 and
MOS6020 Series
SLF7028 and
SLF7045 Series
SUPPLIER
Coilcraft
TDK
WEB SITE
www.coilcraft.com
www.component.tdk.com
+
V BATT
C IN
V IN
L
SW
2
3
9
7
6
FB
V OUT
R1
R2
LQH55D Series
CDRH4D28 Series
D53LC and
D62CB Series
Murata
Sumida
Toko
www.murata.com
www.sumida.com
www.tokoam.com
DT0703 Series
CoEV
www.coev.net
GND
4
5
SS
C OUT
MJPF2520 Series
FDK
www.fdk.com
C SS
Output Capacitor Selection
Figure 2: Recommended Component Placement
COMPONENT SELECTION
3499 F02
The output voltage ripple has three components to it. The
bulk value of the capacitor is set to reduce the ripple due
to charge into the capacitor each cycle. The maximum
ripple voltage due to charge is given by:
V RBULK = I P ?
InductorSelection
The LTC3499/LTC3499B allow the use of small surface
mount inductors and chip inductors due to the fast 1.2MHz
switching frequency. A minimum inductance value of
2.2μH is required. Larger values of inductance will allow
greater output current capability by reducing the induc-
tor ripple current. Increasing the inductance above 10μH
will increase total solution area while providing minimal
improvement in output current capability.
V IN
( C OUT ? V OUT ? f )
where I P = peak inductor current and f = switching
frequency.
The ESR (equivalent series resistance) is usually the most
dominant factor for ripple in most power converters. The
ripple due to capacitor ESR is simply given by:
V RCESR = I P ? C ESR
where C ESR = capacitor equivalent series resistance.
3499fc
10
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