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参数资料
| 型号： | LT3473EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1A 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： | 可调至 34V |
| 输入电压： | 2.2 V ~ 16 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 1A |
| 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-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LT3473/LT3473A
APPLICATIO S I FOR ATIO
resulting sum is fed into the positive terminal of the PWM
comparator A2. When this voltage exceeds the level of the
error signal V C , the SR latch is reset, turning off the power
switch Q1. The error amplifier sets the peak current level
to keep the output in regulation. If the error amplifier’s
output increases, more current is delivered to the output;
if it decreases, less current is delivered.
The LT3473 includes an internal power Schottky diode and
80
75
70
65
60
V IN = 3.6V
V OUT = 20V
TOKO A915AY-6R8M
SUMIDA CDRH4D28-6R8
SUMIDA CDRH5D18-6R2
COILCRAFT ME3220-682
LEAD CURRENT l O (mA)
a PNP transistor, Q2, for output disconnect. Q2 discon-
nects the load from the input during shutdown. The part
also has a power good indication pin, PGOOD. When the
FB voltage reaches within 100mV of the reference voltage,
the comparator A4 turns on Q5, sinking current from
PGOOD pin.
The LT3473 has thermal shutdown feature with threshold
at about 145 ° C.
Inductor Selection
A 6.8 μ H inductor is recommended for the LT3473. The
minimum inductor size that may be used in a given appli-
cation depends on required efficiency and output current.
Inductors with low core losses and small DCR (copper
COILCRAFT MSS5131-682
55
0 20 40 60 80 100
3473 F03
Figure 3. Efficiency Comparison of Different Inductors
Capacitor Selection
The small package of ceramic capacitors makes them
suitable for LT3473 applications. X5R and X7R types of
ceramic capacitors are recommended because they retain
their capacitance over wider voltage and temperature
ranges than other types such as Y5V or Z5U. A 4.7 μ F input
capacitor, a 0.47 μ F output capacitor and a 2.2 μ F capacitor
bypassing output disconnect PNP are sufficient for most
LT3473 applications.
Table 2. Recommended Ceramic Capacitor Manufacturers
wire resistance) at 1.2MHz are good choices for LT3473
applications. Some inductors in this category with small
size are listed in Table 1. The efficiency comparison of
different inductors is shown in Figure 3.
MANUFACTURER
Taiyo Yuden
AVX
Murata
Kemet
TELEPHONE
408-573-4150
843-448-9411
814-237-1431
408-986-0424
URL
www.t-yuden.com
www.avxcorp.com
www.murata.com
www.kemet.com
Table 1. Recommended Inductors
DCR
CURRENT
DIMENSION
PART
DO1605T-682
ME3220-682
MSS6122-682
MSS5131-682
LQH55DN6R8
(m ? )
200
270
100
60
74
RATING (A)
1.1
1.0
1.45
1.05
2.0
(mm)
5.4 × 4.2 × 1.8
3.2 × 2.5 × 2.0
6.1 × 6.1 × 2.2
5.1 × 5.1 × 3.1
5.7 × 5.0 × 4.7
MANUFACTURER
Coilcraft
800-322-2645
www.coilcraft.com
Murata
814-237-1431
www.murata.com
CDRH5D18-6R2
CDRH4D28-6R8
CDRH5D28-6R2
CRD53-4R7
A918CY-6R2M
71
81
33
74
62
1.4
1.12
1.8
1.68
1.49
5.7 × 5.7 × 2.0
4.7 × 4.7 × 3.0
5.7 × 5.7 × 3.0
6.0 × 5.2 × 3.2
6.0 × 6.0 × 2.0
Sumida
847-956-0666
www.sumida.com
Toko
(TYPE D62LCB)
408-432-8281
A915AY-6R8M
68
1.51
5.0 × 5.0 × 3.0
www.tokoam.com
(TYPE D53LC)
3473f
8
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