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参数资料
| 型号： | LT3581IMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/36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
L2
L1
3.3μH
3.3μH
C OUT
C IN
D1
3.3μF 4.7μF I OUT < 625mA
R FB
R T
C SS R C
11k
100nF
GND
C C
| V OUT | + 0 . 5 V
V IN + | 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 ? ( )
L MIN = (2)
( V IN – 0 . 3 V ) ? DC
L MAX = (3)
f O S C ? 0 . 35 A
( V IN – 0 . 3 V ) ? DC
f OSC ? L
I OUT = ? 3 . 3 A – RIPPLE ? ? ( 1 – DC )
Step 5: I OUT
DUAL INDUCTOR INVERTING CONVERTER COMPONENT
SELECTION (COUPLED OR UN-COUPLED INDUCTORS)
C1
1μF
V IN V OUT
5V –12V
SW1 SW2 20V
1A
143k
V IN FB
R FAULT LT3581
100k
FAULT GATE
ENABLE SHDN CLKOUT
RT V C
43.2k SYNC SS C F
47pF
1nF
3581 F07
Figure 7. Dual Inductor Inverting Converter – The Component
Values and Voltages Given Are Typical Values for a 2MHz, 5V to
–12V Inverting Topology Using Coupled Inductors
Due to its unique FB pin, the LT3581 can work in a Dual
Inductor Inverting configuration as in Figure 7. Changing
the connections of L2 and the Schottky diode in the SEPIC
topology results in generating negative output voltages.
This solution results in very low output voltage ripple
due to inductor L2 being in series with the output. Output
disconnect is inherently built into this topology due to the
capacitor C1.
Table 3. Dual Inductor Inverting Design Equations
PARAMETERS/EQUATIONS
Step 1: Inputs Pick V IN , V OUT , and f OSC to calculate equations belo w.
Step 2: DC DC ?
(1)
f OSC ? 1 A
1 – DC
Step 3: L
? 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 =
Step 4: I RIPPLE
? L = L1 = L2 for coupled inductors.
? L = L1 ?? L2 for un-coupled inductors.
? I ?
? 2 ?
Step 6: D1 V R > V IN + | V OUT | ; I AVG > I OUT
C OUT ≥
+
Table 3 is a step-by-step set of equations to calculate
component values for the LT3581 when operating as a
dual inductor inverting converter. Input parameters are
input and output voltage, and switching frequency (V IN ,
V OUT and f OSC respectively). Refer to the Appendix for
further information on the design equations presented
in Table 3.
Step 7: C1
Step 8: C OUT
Step 9: C IN
C 1 ≥ 1 μF ; V RATING ≥ V IN + | V OUT |
I RIPPLE
8 ? 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
R FB =
| V OUT | + 5 mV
Step 10: R FB
R T =
– 1 ; f OSC in MHz and R T in k ?
f OSC
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
? Refer to Input Capacitor Selection in Appendix for
definition of C VIN and C PWR .
83 . 3 μA
87. 6
Step 11: R T
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
For more information www.linear.com/LT3581
15
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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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