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参数资料
| 型号： | LTC3459EDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 6DFN |
| 标准包装： | 500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 10 V |
| 输入电压： | 1.5 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 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： | 6-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x2） |
LTC3459
OPERATION
0 . 6 μ A + OUT IN
This is accomplished by varying the t OFF period by ap-
proximately 1/(V OUT – V IN ). Due to propagation delays
and a 0.6μA bias current in the timer, the t OFF time can be
more accurately predicted as follows:
t OFF ≈ 100 ns +
0 . 8 pF ? 1 . 25 V
V – V
500 k
If V OUT is less than V IN , the t OFF delay is ?xed at approxi-
mately 750ns.
APPLICATIONS INFORMATION
Inductor Selection
An inductor with a minimum value of 15μH is recommended
for use with the LTC3459. Values larger than 15μH will
result in lower ripple current and switching frequency.
High frequency ferrite core materials are strongly recom-
mended. Some inductors meeting these requirements are
listed in Table 1.
Capacitor Selection
The boost converter requires two capacitors. The input
capacitor should be an X5R type of at least 1.0μF. The V OUT
capacitor should also be an X5R type between 2.2μF and
10μF. A larger capacitor should be used if lower peak-to-
peak output ripple and better line regulation is desired.
Table 2. Capacitor Vendor Information
Table 1. Example Inductors
SUPPLIER
PHONE
WEBSITE
L
DCR (Ω)/
DIMENSIONS
CONTACT
AVX
(803) 448-9411
www.avxcorp.com
VENDOR/PART
(μH) I MAX (mA)
(mm)
INFORMATION
Murata
(714) 852-2001
www.murata.com
Chip Inductors
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
Murata
LQH31C
LQH32C-Low Pro?le
22
22
3/160
0.7/250
3.2 × 1.6 × 1.8
3.2 × 2.5 × 1.6
www.murata.com
TDK
(847) 803-6100
www.component.tdk.com
Taiyo Yuden
LB2016
15
22
0.7/130
1/105
2.0 × 1.6 × 1.6
www.t-yuden.com
(408) 573-4150
PCB Layout Guidelines
The high speed operation of the LTC3459 demands care-
33
1.7/85
ful attention to board layout. You will not get advertised
Toko
LLB2520
15
22
1.7/180
2.5/160
2.5 × 2.0 × 1.6
www.tokoam.com
(847) 297-0070
performance with a careless layout. Figure 4 shows the
recommended component placement for the TSOT ver-
33
3.8/130
sion of the part. A large ground pin copper area will help
Coilcraft
DO3314
DO1606T
15
22
15
22
33
0.86/650
1.2/500
0.4/700
0.5/500
0.74/450
3.3 × 3.3 × 1.4
6.5 × 5.3 × 2.0
www.coilcraft.com
(847) 639-6400
to lower the chip temperature.
RECOMMENDED COMPONENT
PLACEMENT. TRACES CARRYING
CURRENT ARE DIRECT. TRACE
AREA AT FB PIN IS SMALL. LEAD
LENGTH TO BATTERY IS SHORT
Sumida
CMD4D06
15
22
0.5/400
0.8/300
6.6 × 5.8 × 0.8
www.sumida.com
(847) 956-0666
V IN
1
2
SW V IN 6
GND V OUT 5
CDRJ2D1BLD
33
15
1.3/240
0.175/350 3.2 × 3.2 × 2.0
3
FB SHDN 4
SHDN
22
33
0.255/300
0.37/240
V OUT
3459 F04
Figure 4. Recommended Component
Placement for a Single-Layer Board
3459fc
8
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| LTC3459ES6#TR | 功能描述:IC REG BOOST SYNC ADJ SOT23-6 RoHS:否 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3459ES6#TRM | 功能描述:IC REG BOOST SYNC ADJ SOT23-6 RoHS:否 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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