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参数资料
| 型号： | LT1676CS8 |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.7A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 51 V |
| 输入电压： | 7.4 V ~ 60 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 700mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
LT1676
TYPICAL APPLICATIO N S
to maintain proper short-circuit protection. Transistors
Q1, Q2 and resistor R7 form a high V IN , low quiescent
current voltage regulator to power U2.
Burst Mode Operation Configuration with UVLO
Figure 7a uses an external comparator to control the
LT1676 via its SHDN pin. As such, the user’s ability to set
an undervoltage lockout (UVLO) threshold with a resistor
divider from V IN to SHDN pin to ground is lost. This ability
is regained in the slightly more complicated circuit shown
in Figure 8.
A dual comparator, the LTC1442, replaces the previous
single comparator. The second comparator monitors a
resistive divider between V IN and ground to provide the
(user-adjustable) UVLO function. The two comparator
outputs are logically combined in a CMOS NOR gate (U3)
to drive the LT1676 SHDN pin.
V IN
Minimum Size Inductor Application
Figure 4a employs power path parts that are capable of
delivering the full rated output capability of the LT1676.
Potential users with low output current requirements may
be interested in substituting a physically smaller and less
costly power inductor. The circuit shown on the last page
of this data sheet is topologically identical to the basic
application, but specifies a much smaller inductor, and, a
somewhat smaller input electrolytic capacitor. This circuit
is capable of delivering up to 150mA at 5V, or, up to 200mA
at 3.3V. The only disadvantage is that due to the increased
resistance in the inductor, the circuit is no longer capable
of withstanding indefinite short circuits to ground. The
LT1676 will still current limit at its nominal I LIM value, but
this will overheat the inductor. Momentary short circuits
of a few seconds or less can still be tolerated.
+
5
R7
10M
Q1
C1
6
V IN
SYNC V CC
V SW
U1
LT1676
2
3
D1
L1
+
C2
R1
39k
V OUT
5V
Q2
2N2369
PN2484
1
SHDN
GND
4
FB
V C
7
8
C3
100pF
5%
R2
10k
5%
R3
323k
1%
90
80
V IN = 12V
OUT
IN
V
GND
NC
8
C1: PANASONIC HFQ 39 μ F AT 63V
C2: AVX D CASE 100 μ F 10V
TPSD107M010R0080
D1: MOTOROLA 100V, 1A,
SMD SCHOTTKY
MBRS1100 (T3)
L1: COILCRAFT DO3316-224
7
V +
+
IN –
U2
LTC1440
REF
HYST
–
3
4
6
5
R5
22k
R6
R4
100k
1%
70
60
50
40
30
20
V IN = 48V
V IN = 36V
V IN = 24V
2
1
2.4M
1
10
100
1000
I LOAD (mA)
14
1676 F07a
(a)
Figure 7. Burst Mode Operation Configuration for High Efficiency at Light Load
(b)
1676 F07b
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1676CS8#PBF | 功能描述:IC REG BUCK ADJ 0.7A 8SOIC 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 |
| LT1676CS8#TR | 功能描述:IC REG BUCK ADJ 0.7A 8SOIC 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 |
| LT1676CS8#TRPBF | 功能描述:IC REG BUCK ADJ 0.7A 8SOIC 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: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 |
| LT1676CS8PBF | 制造商:Linear Technology 功能描述:Sw. Regulator Step-Down 7.4-60V SOIC8 |
| LT1676I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Range, High Efficiency, Step-Down Switching Regulator |
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