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参数资料
| 型号： | LT1776IS8#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 230 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 8/20页 |
| 文件大小： | 224K |
| 代理商： | LT1776IS8#TR |
16
LT1776
TYPICAL APPLICATIONS
U
(a)
C1: PANASONIC HFQ 39
F AT 63V
C2: AVX D CASE 100
F 10V
TPSD107M010R0080
C3: 2200pF, X7R
C1
1776 F06a
VIN
10V TO
40V
+
C2
+
D1
R1
36.5k
1%
VOUT
5V
0mA to 400mA
R2
12.1k
1%
R3
22k
5%
L1
68
H
C3
C4
C5
C4, C5: 100pF, X7R OR COG/NPO
D1: MOTOROLA 100V, 1A, SMD SCHOTTKY
MBRS1100 (T3)
L1: COILCRAFT DO1608C-683
FOR 3.3V VOUT VERSION:
IOUT: 0mA TO 500mA
L1: 47
H, DO1608C-473
R1: 24.3K, R2: 14.7k
VIN
VCC
VSW
LT1776
FB
VC
SHDN
SYNC
2
5
4
3
7
8
1
6
GND
LOAD CURRENT (mA)
1
60
EFFICIENCY
(%)
70
80
90
10
100
1000
1776 F06b
50
40
30
20
VIN = 10V
VIN = 20V
VIN = 30V
VIN = 40V
(b)
Figure 6. Minimum Inductor Size Application
“bang-bang” digital manner, via comparator U2, an
LTC1440. Resistor divider R3/R4 provides a scaled ver-
sion of the output voltage, which is compared against U2’s
internal reference. Intentional hysteresis is set by the R5/
R6 divider. As the output voltage falls below the regulation
range, the LT1776 is turned on. The output voltage rises,
and as it climbs above the regulation range, the LT1776 is
turned off. Efficiency is maximized, as the LT1776 is only
powered up while it is providing heavy output current.
Burst Mode Operation Configuration
Figure 4b demonstrates that power supply efficiency de-
grades with lower output load current. This is not surpris-
ing, as the LT1776 itself represents a fixed power overhead.
A possible way to improve light load efficiency is in Burst
Mode operation.
Figure 7 shows the LT1776 configured for Burst Mode
operation. Output voltage regulation is now provided in a
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1777 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Noise Step-Down Switching Regulator |
| LT1777C | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Noise Step-Down Switching Regulator |
| LT1777CS | 功能描述:IC REG BUCK ADJ 0.7A 16SOIC RoHS:否 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 |
| LT1777CS#PBF | 功能描述:IC REG BUCK ADJ 0.7A 16SOIC 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 |
| LT1777CS#TR | 功能描述:IC REG BUCK ADJ 0.7A 16SOIC RoHS:否 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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