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参数资料
| 型号： | LT3506AIDHD#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.6 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 5 X 4 MM, PLASTIC, MO-229WJGD-2, DFN-16 |
| 文件页数： | 24/24页 |
| 文件大小： | 210K |
| 代理商： | LT3506AIDHD#TR |
LT3506/LT3506A
9
3506afc
The current in the inductor is a triangle wave with an
average value equal to the load current. The peak switch
current is equal to the output current plus half the peak-to-
peak inductor ripple current. The LT3506 limits its switch
current in order to protect itself and the system from
overload faults. Therefore, the maximum output current
that the LT3506 will deliver depends on the current limit,
the inductor value and the input and output voltages. L
is chosen based on output current requirements, output
voltage ripple requirements, size restrictions and efciency
goals. When the switch is off, the inductor sees the output
voltage plus the catch diode drop. This gives the peak-to-
peak ripple current in the inductor:
ΔIL = (1 – DC)(VOUT + VD)/(L f)
where f is the switching frequency of the LT3506 and L
is the value of the inductor. The peak inductor and switch
current is
ISWPK = ILPK = IOUT + ΔIL/2.
To maintain output regulation, this peak current must be
less than the LT3506’s switch current limit ILIM. ILIM is at
least 2A at low duty cycle and decreases linearly to 1.7A
at DC = 0.8. The maximum output current is a function of
the chosen inductor value:
IOUT(MAX) = ILIM – ΔIL/2 = 2A(1 – 0.21DC) – ΔIL/2
If the inductor value is chosen so that the ripple current
is small, then the available output current will be near
the switch current limit. One approach to choosing the
inductor is to start with the simple rule given above, look
at the available inductors, and choose one to meet cost or
space goals. Then use these equations to check that the
LT3506 will be able to deliver the required output current.
Note again that these equations assume that the inductor
current is continuous. Discontinuous operation occurs
when IOUT is less than ΔIL/2 as calculated above.
Table 1. Inductors
PART NUMBER
VALUE
(μH)
ISAT (A)
DCR (
Ω)
HEIGHT
(mm)
Sumida
CR43-3R3
3.3
1.44
0.086
3.5
CR43-4R7
4.7
1.15
0.109
3.5
CDC5d23-2R2
2.2
2.16
0.030
2.5
CDRH5D28-2R6
2.6
2.60
0.013
3.0
CDRH6D26-5R6
5.6
2.00
0.027
2.8
CDH113-100
10
2.00
0.047
3.7
Coilcraft
DO1606T-152
1.5
2.10
0.060
2.0
DO1606T-222
2.2
1.70
0.070
2.0
DO1608C-332
3.3
2.00
0.080
2.9
DO1608C-472
4.7
1.50
0.090
2.9
DO1813P-682HC
6.8
2.20
0.080
5.0
Cooper
SD414-2R2
2.2
2.73
0.061
1.35
SD414-6R8
6.8
1.64
0.135
1.35
UP1B-100
10
1.90
0.111
5.0
Toko
(D62F)847FY-2R4M
2.4
2.5
0.037
2.7
(D73LF)817FY-2R2M
2.2
2.7
0.03
3.0
Input Capacitor Selection
Bypass the input of the LT3506 circuit with a 4.7μF or
higher ceramic capacitor of X7R or X5R type. A lower
value or a less expensive Y5V type can be used if there is
additional bypassing provided by bulk electrolytic or tan-
talum capacitors. The following paragraphs describe the
input capacitor considerations in more detail. Step-down
regulators draw current from the input supply in pulses
with very fast rise and fall times. The input capacitor is
required to reduce the resulting voltage ripple at the LT3506
and to force this very high frequency switching current
into a tight local loop, minimizing EMI. The input capaci-
APPLICATIONS INFORMATION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3506AIDHD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506AIFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506AIFE#PBF | 功能描述:IC REG BUCK ADJ 1.6A DL 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3506AIFE#TRPBF | 功能描述:IC REG BUCK ADJ 1.6A DL 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3506AIFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
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