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| 型号： | LT3581IMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/36页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 16MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相，回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.22 V ~ 42 V |
| 输入电压： | 2.5 V ~ 22 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 3.3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
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LT3581
APPLICATIONS INFORMATION
L1
1.5μH
V OUT
V IN
5V
R GATE
SW1 SW2
C IN
R FAULT LT3581 R FB
130k
C OUT2
R C
10.5k
SYNC
SS
C SS
R T
C C
43.2k
1nF
Step 2: V OUT – V IN + 0 . 5 V
V OUT + 0 . 5 V – 0 . 3 V
( V IN – 0 . 3 V ) ? DC
L TYP =
( V IN – 0 . 3 V ) ? ( 2 ? D C – 1 )
2 . 2 A ? f OSC ? ( 1 – DC )
( V IN – 0 . 3 V ) ? DC
=
L MAX
L1
f O S C ? 0 . 35 A
Step 4: ( V IN – 0 . 3 V ) ? DC
I RIPPLE =
I OUT = ? 3 . 3 A – RIPPLE ? ? ( 1 – DC )
? I ?
V R > V OUT ; I AVG > I OUT
BOOST CONVERTER COMPONENT SELECTION
D1 OPTIONAL
20V, 2A
PMOS
12V
C OUT1 I OUT < 0.83A
4.7μF
6.04k
V IN FB
4.7μF 100k
FAULT GATE
SHDN CLKOUT 4.7μF
RT V C
C F
56pF
GND
0.1μF
3581 F05
Figure 5. Boost Converter – The Component Values and Voltages
Given Are Typical Values for a 2MHz, 5V to 12V Boost
The LT3581 can be configured as a Boost converter as
in Figure 5. This topology allows for positive output volt-
ages that are higher than the input voltage. An external
PMOS (optional) driven by the GATE pin of the LT3581 can
achieve input or output disconnect during a fault event.
A single feedback resistor sets the output voltage. For
output voltages higher than 40V, see the Charge Pump
Aided Regulators section.
Table 1. Boost Design Equations
PARAMETERS/EQUATIONS
Step 1: Pick V IN , V OUT , and f OSC to calculate equations below.
Inputs
DC ?
DC
(1)
f OSC ? 1 A
L MIN = (2)
Step 3:
(3)
? Pick L1 out of a range of inductor values where the minimum
value of the range is set by L TYP or L MIN , whichever is higher.
The maximum value of the range is set by L MAX . See appendix
on how to choose current rating for inductor value chosen.
I RIPPLE f OSC ? L 1
Step 5:
I OUT ? 2 ?
Step 6:
D1
+
R FB =
R T =
– 1 ; f OSC in MHz and R T in k ?
Table 1 is a step-by-step set of equations to calculate
component values for the LT3581 when operating as a
boost converter. Input parameters are input and output
voltage, and switching frequency (V IN , V OUT and f OSC re-
spectively). Refer to the Appendix for further information
on the design equations presented in Table 1.
Variable Definitions:
V IN = Input Voltage
V OUT = Output Voltage
DC = Power Switch Duty Cycle
f OSC = Switching Frequency
I OUT = Maximum Average Output Current
I RIPPLE = Inductor Ripple Current
R DSON_PMOS = R DSON of External PMOS (set to 0 if not
using PMOS)
Step 7:
C OUT1 ,
C OUT2
Step 8:
C IN
Step 9:
R FB
Step 10:
R T
Step 11:
PMOS
C OUT 1 = C OUT 2 ≥
I OUT ? DC
f OSC ?? 0 . 01 ? V OUT – 0 . 50 ? I OUT ? R DSON _ PMOS ??
? If PMOS is not used, then use just one capacitor where
C OUT = C OUT1 + C OUT2 .
C IN ≥ C VIN + C PWR ≥
3 . 3 A ? DC I RIP P LE
45 ? f OSC ? 0 . 005 ? V IN 8 ? f OSC ? 0 . 005 ? V IN
? Refer to Input Capacitor Selection in Appendix for definition of
C VIN and C PWR .
V OUT – 1. 215 V
83 . 3 μA
87.6
f OSC
Only needed for input or output disconnect. See PMOS Selection
in the Appendix for information on sizing the PMOS, R GATE and
picking appropriae UVLO components.
Note 1: The maximum design target for peak switch current is 3.3A and is
used in this table.
Note 2: The final values for C OUT1 , C OUT2 and C IN may deviate from the
above equations in order to obtain desired load transient performance.
3581fa
For more information www.linear.com/LT3581
13
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| LT3582EUD#PBF | 功能描述:IC REG BOOST INV ADJ DL 16QFN 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3582EUD#TRPBF | 功能描述:IC REG BOOST INV ADJ DL 16QFN 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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