參數(shù)資料
型號: LT1676
廠商: Linear Technology Corporation
英文描述: Wide Input Range, High Efficiency, Step-Down Switching Regulator(寬輸入范圍,高效率,步降開關(guān)穩(wěn)壓器)
中文描述: 輸入范圍寬,高效率,降壓型開關(guān)穩(wěn)壓器(寬輸入范圍,高效率,步降開關(guān)穩(wěn)壓器)
文件頁數(shù): 12/16頁
文件大小: 140K
代理商: LT1676
12
LT1676
TYPICAL APPLICATIO
N
S
Figure 4a. Minimum Component Count Application
Figure 4b. P
OUT
/P
IN
Efficiency
C1: PANASONIC HFQ
C2: AVX D CASE TPSD107M010R0080
C4, C5: X7R OR COG/NPO
D1: MOTOROLA 100V, 1A, SMD SCHOTTKY
L1: COILCRAFT DO3316P-224
C1
39
μ
F
63V
1676 F04a
V
IN
12V TO
48V
+
C2
100
μ
F
10V
+
D1
MBRS1100
R1
36.5k
1%
V
OUT
5V
0mA to 500mA
R2
12.1k
1%
R3
22k
5%
L1
220
μ
H
C3
2200pF
X7R
C4
100pF
C5
100pF
FOR 3.3V V
VERSION:
R1: 24.3K, R2: 14.7k
L1: 150
μ
H, DO3316P-154
I
OUT
: 0mA TO 500mA
V
IN
V
CC
V
SW
LT1676
FB
V
C
SHDN
SYNC
2
5
4
3
7
8
1
6
GND
I
LOAD
(mA)
1
60
E
70
80
90
10
100
1000
1676 F04b
50
40
30
20
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
C1
1676 F05
V
IN
+
C2
+
D1
R1
V
OUT
R2
R3
L1
C3
R4
210k
1%
R5
6.19k
1%
C4
C5
V
IN
V
CC
V
SW
LT1676
FB
V
C
SHDN
SYNC
2
5
4
3
7
8
1
6
GND
Figure 5. User Programmable Undervoltage Lockout
desired V
IN
UVLO voltage minus 1.25V applied across it.
(The 2.5
μ
A factor is an allowance to minimize error due to
SHDN pin input current.)
Behavior is as follows: Normal operation is observed at the
nominal input voltage of 48V. As the input voltage is
decreased to roughly 43V, switching action will stop, V
OUT
will drop to zero, and the LT1676 will draw its V
IN
and V
CC
quiescent currents from the V
IN
supply. At a much lower
input voltage, typically 18V or so at 25
°
C, the voltage on
the SHDN pin will drop to the shutdown threshold, and the
part will draw its shutdown current only from the V
IN
rail.
The resistive divider of R4 and R5 will continue to draw
power from V
IN
. (The user should be aware that while the
SHDN pin lockoutthreshold is relatively accurate includ-
ing temperature effects, the SHDN pin shutdownthresh-
old is more coarse, and exhibits considerably more
temperature drift. Nevertheless the shutdown threshold
will always be well below the lockout threshold.)
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LT1676C 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Input Range, High Efficiency, Step-Down Switching Regulator
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LT1676CN8#PBF 功能描述:IC REG BUCK ADJ 0.7A 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓(升壓) 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式,混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC(0.154",3.90mm 寬) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC
LT1676CS8 功能描述:IC REG BUCK ADJ 0.7A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓(升壓) 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式,混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC(0.154",3.90mm 寬) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC
LT1676CS8#PBF 功能描述:IC REG BUCK ADJ 0.7A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓(降壓) 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON(1.45x1) 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2