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| 型号： | LT8582IDKD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/36页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 3A 24DFN |
| 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： | 2 |
| 输出电压： | 最高 42V |
| 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： | 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： | 24-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-DFN（7x4） |
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LT8582
APPLICATIONS INFORMATION
Boost Converter Component Selection
Table 1. Boost Converter Design Equations
V OUT – V IN + 0.5V
V OUT + 0.5V – 0.3V
V IN
5V
L1
4.7μH
SWA
D1
30V, 2A
SWB
C OUT1
10μF
R FBX
130k
OPTIONAL
M1
6.04k
V OUT
12V
0.8A
Step 1: Inputs
Step 2: DC
PARAMETERS/EQUATIONS
Choose V IN , V OUT and f OSC to calculate equations
below.
DC ?
215k
100k
V IN FBX
LT8582
SHDN CHx GATE
PG CLKOUT
C OUT2
10μF
Step 3: L1
L TYP =
(V IN – 0.3) ? DC
f OSC ? 1A
(1)
C IN
4.7μF
R T
53.6k
RT
SYNC GND
V C
SS
47pF
6.49k
L MIN =
(V IN – 0.3V) ? (2 ? DC – 1)
1.7A ? f OSC ? (1 – DC)
(2)
0.1μF
4.7nF
8582 F05
L MAX =
(V IN – 0.3V) ? DC
f OSC ? 0.18A
(3)
Figure 5. Boost Converter – The Component Values Given
Are Typical Values for a 1.5MHz, 5V to 12V Boost
Each channel of the LT8582 can be configured as a boost
converter as in Figure 5. This topology allows for positive
? Solve equations 1, 2 and 3 for a range of L
values
? The minimum of the L value range is the
higher of L TYP and L MIN
? The maximum of the L value range is L MAX
output voltages that are higher than the input voltage. An
external PMOS (optional) driven by the GATE pin of the
Step 4: I RIPPLE
I RIPPLE =
(V IN – 0.3V) ? DC
f OSC ? L 1
I OUT = ? 3A –
LT8582 can achieve input or output disconnect during a
FAULT event, SHDN < 1.31V, or V IN < 2.3V. Figure 5 shows
the configuration for output disconnect. A single feedback
resistor sets the output voltage. For output voltages higher
than 40V, see the Charge Pump Topology in the Charge
Pump Aided Regulators section.
Table 1 is a step-by-step set of equations to calculate
component values for the LT8582 when operating as a
boost converter. Input parameters are input and output
voltage and switching frequency (V IN , V OUT and f OSC re-
Step 5: I OUT
Step 6: D1
Step 7: C OUT
Step 8: C IN
? I RIPPLE ?
?
? 2 ? ? (1 – DC)
V R ≥ V OUT ; I AVG ≥ I OUT
C OUT1 C OUT2
I OUT DC
f OSC (0.01 V OUT – 0.5 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
spectively). Refer to the Appendix for further information
on the design equations presented in Table 1.
3A DC
50 f OSC 0.005 V IN
I RIPPLE
8 f OSC 0.005 V IN
R FBX = ? OUT
Variable Definitions:
V IN = Input Voltage
Step 9: R FBX
? V – 1.204V ?
?
? 83.3μA ?
V OUT = Output Voltage
DC = Power Switch Duty Cycle
Step 10: R T
R T =
81.6
f OSC
–1; f OSC in MHz and R T in k Ω
f OSC = Switching Frequency
I OUT = Maximum Output Current
I RIPPLE = Inductor Ripple Current
R DSON_PMOS = R DSON of External Output PMOS (set to 0
if not using PMOS)
Step 11: PMOS Only needed for input or output disconnect. See
PMOS Selection in the Appendix for information
on sizing the PMOS and the biasing resistor,
R GATE and picking appropriate UVLO components.
Note 1: Above equations use numbers good for many applications but
for more exact results use the equations from the appendix with numbers
from the Electrical Characteristics.
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.
8582f
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT8584IFE#PBF | 制造商:Linear Technology 功能描述:IC BATT CELL BALANCE 16TSSOP 制造商:Linear Technology 功能描述:BATTERY BALANCER, 2.5V-5.3V, TSSOP-16, Supply Voltage Min:2.5V, Supply Voltage M |
| LT8610 | 制造商:LINER 制造商全称:Linear Technology 功能描述:42V, 2.5A Synchronous Step-Down Regulator |
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| LT8610AHMSE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 2.5A 16MSOP 制造商:Linear Technology 功能描述:SWITCHING REG, BUCK, ADJ, 2.2MHZ, MSOP16 制造商:Linear Technology 功能描述:SWITCHING REG, BUCK, ADJ, 2.2MHZ, MSOP16, Primary Input Voltage:42V, No. of Outp |
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