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| 型号： | LT1931ES5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG INV 1A TSOT23-5 |
| 标准包装： | 1 |
| 类型： | 反相 |
| 输出数： | 1 |
| 输入电压： | 2.45 V ~ 16 V |
| PWM 型： | 电流模式 |
| 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： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 标准包装 |
| 供应商设备封装： | TSOT-23-5 |
| 产品目录页面： | 1329 (CN2011-ZH PDF) |
| 其它名称： | LT1931ES5#TRMPBFDKR |
LT1931/LT1931A
APPLICATIO S I FOR ATIO
LT1931A AND LT1931 DIFFERENCES:
Switching Frequency
The key difference between the LT1931A and LT1931 is
the faster switching frequency of the LT1931A. At 2.2MHz,
the LT1931A switches at nearly twice the rate of the
LT1931. Care must be taken in deciding which part to use.
The high switching frequency of the LT1931A allows
smaller cheaper inductors and capacitors to be used in a
given application, but with a slight decrease in efficiency
and maximum output current when compared to the
LT1931. Generally, if efficiency and maximum output
current are critical, the LT1931 should be used. If applica-
tion size and cost are more important, the LT1931A will be
the better choice. In many applications, tiny inexpensive
chip inductors can be used with the LT1931A, reducing
core losses at frequencies above 1MHz are much lower for
ferrite cores than for powdered-iron units. When using
coupled inductors, choose one that can handle at least 1A
of current without saturating, and ensure that the inductor
has a low DCR (copper-wire resistance) to minimize I 2 R
power losses. If using uncoupled inductors, each inductor
need only handle one-half of the total switch current so
that 0.5A per inductor is sufficient. A 4.7 μ H to 15 μ H
coupled inductor or a 15 μ H to 22 μ H uncoupled inductor
will usually be the best choice for most LT1931 designs.
For the LT1931A, a 2.2 μ H to 4.7 μ H coupled inductor or a
3.3 μ H to 10 μ H uncoupled inductor will usually suffice. In
certain applications such as the “Charge Pump” inverting
DC/DC converter, only a single inductor is used. In this
case, the inductor must carry the entire 1A switch current.
Table 1. Recommended Inductors—LT1931
solution cost.
L
Size
PART
( μ H)
(L × W × H) mm
VENDOR
Duty Cycle
The maximum duty cycle (DC) of the LT1931A is 75%
compared to 84% for the LT1931. The duty cycle for a
given application using the dual inductor inverting topol-
CLS62-100
CR43-150
CR43-220
CTX10-1
CTX15-1
10
15
22
10
15
6.8 × 6.6 × 2.5
4.5 × 4.0 × 3.2
8.9 × 11.4 × 4.2
Sumida
(847) 956-0666
www.sumida.com
Coiltronics
(407) 241-7876
ogy is given by:
www. coiltronics.com
LQH3C100K24
10
3.2 × 2.5 × 2.0
Murata
DC =
| V OUT |
| V IN | + | V OUT |
LQH4C150K04
15
(404) 436-1300
www.murata.com
For a 5V to –5V application, the DC is 50% indicating that
the LT1931A can be used. A 5V to –16V application has a
DC of 76.2% making the LT1931 the right choice. The
LT1931A can still be used in applications where the DC, as
calculated above, is above 75%. However, the part must
Table 2. Recommended Inductors—LT1931A
L Size
PART ( μ H) (L × W × H) mm
ELJPC3R3MF 3.3 2.5 × 2.0 × 1.6
ELJPC4R7MF 4.7
VENDOR
Panasonic
(408) 945-5660
www.panasonic.com
be operated in the discontinuous conduction mode so that
the actual duty cycle is reduced.
INDUCTOR SELECTION
Several inductors that work well with the LT1931 are listed
in Table 1 and those for the LT1931A are listed in Table 2.
Besides these, there are many other inductors that can be
CLQ4D10-4R7 1
CLQ4D10-6R8 2
LB20164R7M
LB20163R3M
LQH3C4R7K24
LQH4C100K24
4.7
6.8
4.7
3.3
4.7
10
7.6 × 4.8 × 1.8
2.0 × 1.6 × 1.6
3.2 × 2.5 × 2.0
Sumida
(847) 956-0666
www.sumida.com
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
Murata
(404) 436-1300
www.murata.com
used. Consult each manufacturer for detailed information
and for their entire selection of related parts. Ferrite core
1 Use drawing #5382-T039
2 Use drawing #5382-T041
inductors should be used to obtain the best efficiency, as
1931fa
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1931IS5 | 制造商:Linear Technology 功能描述:1A, -34V, INVERTIN DC/DC CONVERTER IN THIN SOT |
| LT1931IS5#PBF | 制造商:Linear Technology 功能描述: |
| LT1931IS5#TRM | 制造商:Linear Technology 功能描述: |
| LT1931IS5#TRMPBF | 功能描述:IC REG INV 1A TSOT23-5 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: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 |
| LT1931IS5#TRPBF | 功能描述:IC REG INV 1A TSOT23-5 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: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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