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參數資料
| 型號： | LTC1159-5 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/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 |
| 文件頁數： | 6/20頁 |
| 文件大小： | 323K |
| 代理商： | LTC1159-5 |
6
LTC1159/LTC1159-3.3/LTC1159-5
When the voltage on C
T
has discharged past V
TH1
, com-
parator T trips, setting the flip-flop. This causes the N-gate
output to go low (turning off the N-channel MOSFET) and
the P-gate output to also go low (turning the P-channel
MOSFET back on). The cycle then repeats. As
the load
current increases, the output voltage decreases slightly.
This causes the output of the gain stage to increase the
current comparator threshold, thus tracking the load
current.
The sequence of events for Burst Mode operation is very
similar to continuous operation with the cycle interrupted
by the voltage comparator. When the output voltage is at or
above the desired regulated value, the P-channel MOSFET
is held off by comparator V and the timing capacitor
continues to discharge below V
TH1
. When the timing
capacitor discharges past V
TH2
, voltage comparator S
trips, causing the internal SLEEP line to go low and the
N-channel MOSFET to turn off.
The circuit now enters sleep mode with both power
MOSFETs turned off. In sleep mode, much of the cir-
cuitry is turned off, dropping the supply current from
several milliamps (with the MOSFETs switching) to
300
μ
A. When the output capacitor has discharged by
the amount of hysteresis in comparator V, the P-channel
MOSFET is again turned on and this process repeats. To
avoid the operation of the current loop interfering with
Burst Mode operation, a built-in offset is incorporated in
the gain stage.
To prevent both the external MOSFETs from being turned
on at the same time, feedback is incorporated to sense the
state of the driver output pins. Before the N-gate output can
go high, the P-drive output must also be high. Likewise, the
P-drive output is prevented from going low when the N-
gate output is high.
OPERATIOU
(Refer to Functional Diagram)
Internal divider broken at V
FB
for adjustable versions.
FU
W
–
+
N-GATE
P-DRIVE
V
CC
550k
P-GATE
P-GND
550k
CAP
LOW DROP SWITCH
V
CC
EXTV
CC
SHDN2
V
IN
–
+
–
+
SENSE
+
V
R
S
Q
V
TH1
–
+
25mV TO 150mV
13k
G
REFERENCE
1.25V
S-GND
I
TH
C
V
OS
SENSE
–
LTC1159 FD
SHDN1
–
+
T
V
TH2
S
SLEEP
C
T
V
FB
OFF-TIME
CONTROL
SENSE
–
LOW DROPOUT
4.5V REGULATOR
100k
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相關代理商/技術參數 |
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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:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數: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 |
| 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:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數: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 |
| 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:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數: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 |
| LTC1159CG#TRPBF | 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:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 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 ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1159CG-3.3 | 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:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數: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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