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| 型号： | LT1307BCS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 3.3V/5V 0.1A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V |
| 输入电压： | 1 V ~ 5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 100mA |
| 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 |
LT1307/LT1307B
APPLICATIO S I FOR ATIO
LAYOUT HINTS
The LT1307 switches current at high speed, mandating
careful attention to layout for proper performance. You will
not get advertised performance with careless layouts.
Figure 12 shows recommended component placement.
Follow this closely in your PC layout. Note the direct path
of the switching loops. Input capacitor C IN must be placed
close (< 5mm) to the IC package. As little as 10mm of wire
or PC trace from C IN to V IN will cause problems such as
inability to regulate or oscillation. A 1 μ F ceramic bypass
capacitor is the only input capacitance required provided
the battery has a low inductance path to the circuit. The
battery itself provides the bulk capacitance the device
requires for proper operation. If the battery is located some
distance from the circuit, an additional input capacitor may
be required. A 100 μ F aluminum electrolytic unit works well
in these cases. This capacitor need not have low ESR.
COMPONENT SELECTION
Inductors
Inductors appropriate for use with the LT1307 must pos-
sess three attributes. First, they must have low core loss at
600kHz. Most ferrite core units have acceptable losses at
this switching frequency. Inexpensive iron powder cores
should be viewed suspiciously, as core losses can cause
significant efficiency penalties at 600kHz. Second, the
inductor must handle current of 500mA without saturat-
ing. This places a lower limit on the physical size of the unit.
Molded chokes or chip inductors usually do not have
enough core to support 500mA current and are unsuitable
for the application. Lastly, the inductor should have low
DCR (copper wire resistance) to prevent efficiency-killing
I 2 R losses. Linear Technology has identified several induc-
tors suitable for use with the LT1307. This is not an
R C
1
2
C C
LT1307
8
7
KEEP TRACES
OR LEADS SHORT!
exclusive list. There are many magnetics vendors whose
components are suitable for use. A few vendor’s compo-
nents are listed in Table 1.
Table 1. Inductors Suitable for Use with the LT1307
R1
R2
3
4
6
5
L
C IN
PART
LQH3C100
VALUE
10 μ H
MAX
DCR
0.57
MFR
Murata-Erie
HEIGHT
(mm)
2.0
COMMENT
Smallest Size
D
DO1608-103
10 μ H
0.16
Coilcraft
3.0
C OUT
CD43-100
CD54-100
10 μ H
10 μ H
0.18
0.10
Sumida
Sumida
3.2
4.5
Best Efficiency
V OUT
GROUND
1307 F12
CTX32CT-100
10 μ H
0.50
Coiltronics
2.2
1210 Footprint
Figure 12. Recommended Component Placement. Traces
Carrying High Current Are Direct. Trace Area at FB Pin and V C
Pin is Kept Low. Lead Length to Battery Should Be Kept Short
OPERATION FROM A LABORATORY POWER SUPPLY
If a lab supply is used, the leads used to connect the circuit
to the supply can have significant inductance at the
LT1307’s switching frequency. As in the previous situa-
tion, an electrolytic capacitor may be required at the circuit
in order to reduce the AC impedance of the input suffi-
ciently. An alternative solution would be to attach the
circuit directly to the power supply at the supply terminals,
without the use of leads. The power supply’s output
Capacitors
For single cell applications, a 10 μ F ceramic output capaci-
tor is generally all that is required. Ripple voltage in Burst
Mode can be reduced by increasing output capacitance.
For 2- and 3-cell applications, more than 10 μ F is needed.
For a typical 2-cell to 5V application, a 47 μ F to 100 μ F low
ESR tantalum capacitor works well. AVX TPS series (100%
surge tested) or Sprague (don’t be vague—ask for Sprague)
594D series are both good choices for low ESR capacitors.
Alternatively, a 10 μ F ceramic in parallel with a low cost
(read high ESR) electrolytic capacitor, either tantalum or
aluminum, can be used instead. For through hole applica-
capacitance will then provide the bulk capacitance the
LT1307 circuit requires.
1307fa
12
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| LT1307BIS8 | 功能描述:IC REG BOOST 3.3V/5V 0.1A 8SOIC 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 |
| LT1307BIS8#PBF | 功能描述:IC REG BOOST 3.3V/5V 0.1A 8SOIC 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 |
| LT1307BIS8#TR | 功能描述:IC REG BOOST 3.3V/5V 0.1A 8SOIC 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 |
| LT1307BIS8#TRPBF | 功能描述:IC REG BOOST 3.3V/5V 0.1A 8SOIC 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 |
| LT1307CMS8 | 功能描述:IC REG BOOST 3.3V/5V 0.1A 8MSOP 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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