参数资料
| 型号： | LT1613CS5#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BST FLYBACK SEPIC TSOT23 |
| 标准包装： | 1 |
| 类型： | 升压（升压），回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 36 V |
| 输入电压： | 1.1 V ~ 10 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 300mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 剪切带 (CT) |
| 供应商设备封装： | TSOT-23-5 |
| 其它名称： | LT1613CS5 LT1613CS5#TRMCT LT1613CS5-ND |
LT1613
OPERATIO
Table 1 lists several inductors that will work with the
LT1613, although this is not an exhaustive list. There are
many magnetics vendors whose components are suitable
for use.
Diodes
A Schottky diode is recommended for use with the LT1613.
The Motorola MBR0520 is a very good choice. Where the
input to output voltage differential exceeds 20V, use the
MBR0530 (a 30V diode). If cost is more important than
efficiency, the 1N4148 can be used, but only at low current
loads.
Capacitors
The input bypass capacitor must be placed physically
close to the input pin. ESR is not critical and in most cases
an inexpensive tantalum is appropriate.
The choice of output capacitor is far more important. The
quality of this capacitor is the greatest determinant of the
output voltage ripple. The output capacitor must have
enough capacitance to satisfy the load under transient
conditions and it must shunt the switched component of
current coming through the diode. Output voltage ripple
results when this switched current passes through the
finite output impedance of the output capacitor. The
capacitor should have low impedance at the 1.4MHz
switching frequency of the LT1613. At this frequency, the
impedance is usually dominated by the capacitor’s equiva-
lent series resistance (ESR). Choosing a capacitor with
Table 1. Inductor Vendors
lower ESR will result in lower output ripple.
Ceramic capacitors can be used with the LT1613 provided
loop stability is considered. A tantalum capacitor has
some ESR and this causes an “ESR zero” in the regulator
loop. This zero is beneficial to loop stability. The internally
compensated LT1613 does not have an accessible com-
pensation node, but other circuit techniques can be em-
ployed to counteract the loss of the ESR zero, as detailed
in the next section.
Some capacitor types appropriate for use with the LT1613
are listed in Table 2.
OPERATION WITH CERAMIC CAPACITORS
Because the LT1613 is internally compensated, loop sta-
bility must be carefully considered when choosing an
output capacitor. Small, low cost tantalum capacitors
have some ESR, which aids stability. However, ceramic
capacitors are becoming more popular, having attractive
characteristics such as near-zero ESR, small size and
reasonable cost. Simply replacing a tantalum output ca-
pacitor with a ceramic unit will decrease the phase margin,
in some cases to unacceptable levels. With the addition of
a phase lead capacitor (C PL ) and isolating resistor (R3),
the LT1613 can be used successfully with ceramic output
capacitors as described in the following figures.
A boost converter, stepping up 2.5V to 5V, is shown in
Figure 5. Tantalum capacitors are used for the input and
output (the input capacitor is not critical and has little
VENDOR
Sumida
Murata
Coiltronics
PHONE
(847) 956-0666
(404) 436-1300
(407) 241-7876
URL
www.sumida.com
www.murata.com
www.coiltronics.com
PART
CLS62-22022
CD43-220
LQH3C-220
LQH3C-100
LQH3C-4R7
CTX20-1
COMMENT
22 μ H Coupled
22 μ H
22 μ H, 2mm Height
10 μ H
4.7 μ H
20 μ H Coupled, Low DCR
Table 2. Capacitor Vendors
VENDOR
Taiyo Yuden
AVX
PHONE
(408) 573-4150
(803) 448-9411
URL
www.t-yuden.com
www.avxcorp.com
PART
Ceramic Caps
Ceramic Caps
COMMENT
X5R Dielectric
Tantalum Caps
Murata
(404) 436-1300
www.murata.com
Ceramic Caps
6
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