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| 型号： | LT3581EMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/36页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 16MSOP |
| 标准包装： | 37 |
| 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： | 管件 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
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LT3581
APPLICATIONS INFORMATION
SEPIC CONVERTER COMPONENT SELECTION
(COUPLED OR UN-COUPLED INDUCTORS)
Table 2. SEPIC Design Equations
PARAMETERS/EQUATIONS
L1
3.3μH
SW1 SW2
V OUT + 0 . 5 V
V IN + V OUT + 0 . 5 V – 0 . 3 V
( V IN – 0 . 3 V ) ? DC
f OSC ? 1 A
( V IN – 0 . 3 V ) ? ( 2 ? D C – 1 )
2 . 2 A ? f OSC ? ( 1 – DC )
( V IN – 0 . 3 V ) ? DC
f O S C ? 0 . 35 A
V IN
3V TO 16V
ENABLE
R T
124k
C IN
22μF
R FAULT LT3581
100k
FAULT GATE
SHDN CLKOUT
RT V C
SYNC SS
GND
C1
1μF
V IN FB
D1
30V, 2A
L2
3.3μH
C SS
1μF
C OUT
22μF
× 2
R FB
45.3k
R C
7.87k
C C
2.2nF
V OUT
5V
I OUT < 0.9A (V IN = 3V)
I OUT < 1.5A (V IN = 12V)
C F
100pF
3581 F06
Step 1:
Inputs
Step 2:
DC
Step 3:
L
Pick V IN , V OUT , and f OSC to calculate equations below.
DC ?
L TYP =
L MIN =
L MAX =
(1)
(2)
(3)
( V IN – 0 . 3 V ) ? DC
f OSC ? L
I OUT = ? 3 . 3 A – RIPPLE ? ? ( )
1 – DC
C OUT ≥
+
R FB =
Figure 6. SEPIC Converter – The Component Values and Voltages
Given Are Typical Values for a 700kHz, Wide Input Range (3V to
16V) SEPIC Converter with 5V Out
The LT3581 can also be configured as a SEPIC as shown in
Figure 6. This topology allows for positive output voltages
that are lower, equal, or higher than the input voltage. Out-
put disconnect is inherently built into the SEPIC topology,
meaning no DC path exists between the input and output
due to capacitor C1. This implies that a PMOS controlled
by the GATE pin is not required in the power path.
Table 2 is a step-by-step set of equations to calculate
component values for the LT3581 when operating as a
SEPIC 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 2.
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
Step 4:
I RIPPLE
Step 5:
I OUT
Step 6:
D1
Step 7:
C1
Step 8:
C OUT
Step 9:
C IN
Step 10:
R FB
? Pick L 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.
? Pick L1 = L2 = L for coupled inductors.
? Pick L1 ?? L2 = L for un-coupled inductors.
I RIPPLE =
? L = L1 = L2 for coupled inductors.
? L = L1 ?? L2 for un-coupled inductors.
? I ?
? 2 ?
V R > V IN + V OUT ; I AVG > I OUT
C 1 ≥ 1 μF ; V RATING ≥ V IN
I OUT ? DC
f OSC ? 0 . 005 ? V OUT
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
Step 11:
R T
R T =
87.6
f OSC
– 1 ; f OSC in MHz and R T in k ?
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 OUT , C IN and C1 may deviate from the above
equations in order to obtain desired load transient performance.
3581fa
14
For more information www.linear.com/LT3581
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| LT3581IDE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3581IDE#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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