參數(shù)資料
型號(hào)： LTC1159-5
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述： 射頻放大器
文件頁(yè)數(shù)： 11/20頁(yè)
文件大小： 323K
代理商： LTC1159-5
11
LTC1159/LTC1159-3.3/LTC1159-5
APPLICATIU
2. EXTV
CC
Connected Directly to V
OUT
. This is the normal
connection for a 5V regulator and provides the highest
efficiency.
3. EXTV
CC
Connected to an Output-Derived Boost Net-
work. For 3.3V and other low voltage regulators, effi-
ciency gains can still be realized by connecting EXTV
CC
to an output-derived voltage which has been boosted to
greater than 4.5V. This can be done either with the
inductive boost winding shown in Figure 5a or the
capacitive charge pump shown in Figure 5b. The charge
pump has the advantage of simple magnetics and gen-
erally provides the highest efficiency at the expense of a
slightly higher parts count.
4. EXTV
CC
Connected to an External Supply. If an external
supply is available in the 5V to 12V range, it may be used
W
U
U
to power EXTV
CC
providing it is compatible with the
MOSFET gate drive requirements. There are no restric-
tions on the EXTV
CC
voltage relative to V
IN
. EXTV
CC
may
be higher than V
IN
providing EXTV
CC
does not exceed
the 15V absolute maximum rating.
When driving standard threshold MOSFETs, the exter-
nal supply must always be present during operation to
prevent MOSFET failure due to insufficient gate drive
The LTC1149 family should also be considered for
applications which require the use of standard threshold
MOSFETs.
Important Information About LTC1159 Adjustable
Applications
When an output voltage other than 3.3V or 5V is required,
the LTC1159 adjustable version is used with an external
resistive divider from V
OUT
to the V
FB
pin (Figure 6). The
regulated voltage is determined by:
)
R1
The V
FB
pin is extremely sensitive to pickup from the
inductor switching node Care should be taken to isolate
the feedback network from the inductor, and the 100pF
capacitor should be connected between the V
FB
and S-GND
pins next to the package.
In LTC1159N and LTC1159S applications with V
OUT
>
5.5V, the V
CC
pin may self-power through the Sense pins
when SHDN2 is taken high, preventing shutdown. In these
applications, a pull-down must be added to the Sense
–
pin
as shown in Figure 6. This pull-down effectively takes the
place of the SHDN1 pin, ensuring complete shutdown.
Note: For versions in which both the SHDN1 and SHDN2
pins are available (LTC1159G and all fixed output ver-
sions), the two pins are simply connected to each other and
driven together to guarantee complete shutdown.
The Figure 6 circuit cannot be used to regulate a V
OUT
which
is greater than the maximum voltage allowed on the
LTC1159 Sense pins (13V). In applications with V
OUT
>
13V, R
SENSE
must be moved to the ground side of the
output capacitor and load. This operates the current sense
V
OUT
=
1.25V
)
1 +R2
V
IN
P-DRIVE
LTC1159-3.3
P-GATE
N-CH
V
IN
1N4148
P-CH
+
+
+
C
IN
R
SENSE
C
OUT
1
μ
F
V
OUT
LTC1159 F05a
N-GATE
P-GND
EXTV
CC
L
1:1
Figure 5a. Inductive Boost Circuit for EXTV
CC
Figure 5b. Capacitive Charge Pump for EXTV
CC
V
IN
P-DRIVE
LTC1159-3.3
P-GATE
N-CH
BAT85
0.22
μ
F
1
μ
F
BAT85
BAT85
VN2222LL
V
IN
P-CH
+
C
IN
R
SENSE
+
C
OUT
+
V
OUT
LTC1159 F05b
N-GATE
P-GND
EXTV
CC
L
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LTC1159CG 功能描述:IC REG CTRLR BUCK PWM CM 20-SSOP 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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
LTC1159CG#PBF 功能描述:IC REG CTRLR BUCK PWM CM 20-SSOP 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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
LTC1159CG#TR 功能描述:IC REG CTRLR BUCK PWM CM 20-SSOP 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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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