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參數(shù)資料
| 型號： | LTC1159IS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 0.05 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 288K |
| 代理商： | LTC1159IS |
14
LTC1159
LTC1159-3.3/LTC1159-5
certain types of inductors in high current (I
OUT
> 5A)
applications when they are lightly loaded.
An external offset is put in series with the SENSE
–
pin to
subtract from the built-in 0.025V offset. An example of this
technique is shown in Figure 7. Two 100
resistors are
inserted in series with the leads from the sense resistor.
With the addition of R3, a current is generated through R1
causing an offset of:
)
V
OFFSET
= V
OUT
)
R1
R1 + R3
If V
OFFSET
> 0.025V, the minimum threshold will be
cancelled and Burst Mode operation is prevented from
occurring. Since V
OFFSET
is constant, the maximum load
current is also decreased by the same offset. Thus, to get
back to the same I
MAX
, the value of the sense resistor must
be reduced:
75
I
MAX
R
SENSE
≈
m
To prevent noise spikes from erroneously tripping the
current comparator, a 1000pF capacitor is needed across
the SENSE
–
and SENSE
+
pins.
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1159. These items are also illustrated graphically in
the layout diagram of Figure 8. Check the following in your
layout:
4
3
2
1
LTC1159
SENSE
+
SENSE
–
9
8
1000pF
R1
100
R2
100
L
R
SENSE
C
OUT
R3
LTC1159 F07
+
Figure 7. Suppressing Burst Mode Operation
4
3
2
1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
P-GATE
V
IN
V
CC
P-DRIVE
V
CC
C
T
I
TH
SENSE
–
CAP
SHDN2
EXTV
CC
N-GATE
PGND
SGND
SENSE
+
C
OUT
D1
P-CHANNEL
1k
3300pF
C
T
R1
R2
R
SENSE
N-CHANNEL
C
IN
L
+
–
–
+
V
OUT
V
IN
OUTPUT DIVIDER
REQUIRED WITH
ADJUSTABLE
VERSION ONLY
BOLD LINES INDICATE HIGH CURRENT PATHS
LTC1159 F08
1000pF
100pF
1
μ
F
0.15
μ
F
1N4148
SHUTDOWN
5V EXTV
CC
CONNECTION
0.1
μ
F
V
FB
(SHDN1)
+
+
+
Figure 8. LTC1159 Layout Diagram (N and S Packages)
APPLICATIU
W
U
U
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1159IS-3.3 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1159IS-5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1174 | High Efficiency Step-Down and Inverting DC/DC Converter(高效率,反相DC/DC變換器) |
| LTC1174-3.3 | High Efficiency Step-Down and Inverting DC/DC Converter(高效率,步降DC/DC變換器) |
| LTC1174-5 | High Efficiency Step-Down and Inverting DC/DC Converter(高效率,步降DC/DC變換器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1159IS#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1159IS#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1159IS#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1159IS-3.3 | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1159IS-3.3#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
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