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参数资料
| 型号： | LT3500IMSE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件页数： | 4/28页 |
| 文件大小： | 318K |
| 代理商： | LT3500IMSE#TRPBF |
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LT3500
12
3500fc
APPLICATIONS INFORMATION
Table 1. Efciency and Size Comparisons for Different RRT/SYNC Values, VOUT1 = 3.3V
FREQUENCY
RT/SYNC
EFFICIENCY
VIN(MAX)
L
C
C + L AREA
(mm2)
2.5MHz
15k
73.6
12
1μ
10μ
24
2.0MHz
20k
81.5
14
1.5μ
10μ
24
1.5MHz
24.9k
84.5
18
2.2μ
10μ
24
1.0MHz
40.2k
87.3
28
3.3μ
22μ
34
500kHz
90.9k
88.9
36
4.7μ
47μ
40
The following example along with the data in Table 1
illustrates the tradeoffs of switch frequency selection.
Example.
VIN = 25V, VOUT1 = 3.3V, IOUT1 = 2.0A,
Temperature = 0°C to 85°C
tON(MIN) = 185ns (85°C from Typical Characteris-
tics
graph), VD = 0.6V, VSW = 0.4V (85°C)
Max Frequency
=
3.3
+ 0.6
25
0.4+ 0.6
1
185ns
~ 835kHz
RT/SYNC ~ 49.9k
Frequency
820kHz
Input Voltage Range
Once the switching frequency has been determined, the
input voltage range of the regulator can be determined.
The minimum input voltage is determined by either the
LT3500’s minimum operating voltage of ~2.8V or by its
maximum duty cycle. The duty cycle is the fraction of time
that the internal switch is on during a clock cycle. The
maximum duty cycle can be determined from the clock
frequency and the minimum off time from the typical
characteristics graph.
This leads to a minimum input voltage of:
V
IN(MIN) =
V
OUT1 + VD
DC
MAX
V
D + VSW
where VSW is the voltage drop of the internal switch,
and
DCMAX = 1 – tOFF(MIN) Frequency.
Figure 3 shows a typical graph of minimum input voltage
vs load current for 3.3V and 5V applications.
The maximum input voltage is determined by the absolute
maximum ratings of the VIN and BST pins and by the
frequency and minimum duty cycle.
The minimum duty cycle is dened as:
DCMIN = tON(MIN) Frequency
Maximum input voltage as:
V
IN(MAX) =
V
OUT1 + VD
DC
MIN
V
D + VSW
Figure 3. Minimum Input Voltage vs Load Current
LOAD CURRENT (A)
0
INPUT
VOL
TAGE
(V)
3
4
5
1.0
1.6 1.8
3500 F03
2
0.2 0.4 0.6 0.8
1.4
1.2
6
7
8
2.0
VOUT1 = 5V START-UP
VOUT1 = 5V RUNNING
VOUT1 = 3.3V START-UP
VOUT1 = 3.3V RUNNING
fSW = 1MHz
L = 3.3μH
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| LT3501EFE#PBF | 功能描述:IC REG BUCK ADJ 3A DL 20TSSOP 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 |
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