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| 型号： | LT3506AIDHD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.6A DL 16DFN |
| 标准包装： | 73 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 22 V |
| 输入电压： | 3.6 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 1.6A |
| 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-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-DFN（5x4） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3506/LT3506A
APPLICATIONS INFORMATION
The current in the inductor is a triangle wave with an
Table 1. Inductors
average value equal to the load current. The peak switch
current is equal to the output current plus half the peak-to-
PART NUMBER
VALUE
(μH)
ISAT (A)
DCR ( Ω )
HEIGHT
(mm)
peak inductor ripple current. The LT3506 limits its switch
Sumida
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 ef?ciency
CR43-3R3
CR43-4R7
CDC5d23-2R2
CDRH5D28-2R6
CDRH6D26-5R6
CDH113-100
3.3
4.7
2.2
2.6
5.6
10
1.44
1.15
2.16
2.60
2.00
2.00
0.086
0.109
0.030
0.013
0.027
0.047
3.5
3.5
2.5
3.0
2.8
3.7
goals. When the switch is off, the inductor sees the output
Coilcraft
voltage plus the catch diode drop. This gives the peak-to-
peak ripple current in the inductor:
Δ I L = (1 – DC)(V OUT + V D )/(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
I SWPK = I LPK = I OUT + Δ I L /2.
To maintain output regulation, this peak current must be
less than the LT3506’s switch current limit I LIM . I LIM 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
DO1606T-152
DO1606T-222
DO1608C-332
DO1608C-472
DO1813P-682HC
Cooper
SD414-2R2
SD414-6R8
UP1B-100
Toko
(D62F)847FY-2R4M
(D73LF)817FY-2R2M
1.5
2.2
3.3
4.7
6.8
2.2
6.8
10
2.4
2.2
2.10
1.70
2.00
1.50
2.20
2.73
1.64
1.90
2.5
2.7
0.060
0.070
0.080
0.090
0.080
0.061
0.135
0.111
0.037
0.03
2.0
2.0
2.9
2.9
5.0
1.35
1.35
5.0
2.7
3.0
the chosen inductor value:
I OUT(MAX) = I LIM – Δ I L /2 = 2A ?(1 – 0.21 ?DC) – Δ I L /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 I OUT is less than Δ I L /2 as calculated above.
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-
3506afc
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3506AIDHD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| 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 |
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