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參數(shù)資料
| 型號： | LTC1266 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Phase-Locked Loop Systems 14-TSSOP -20 to 75 |
| 中文描述： | 同步穩(wěn)壓控制器或P溝道MOSFET的N |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 361K |
| 代理商： | LTC1266 |
7
LTC1266
LTC1266-3.3/LTC1266-5
FU
W
Pin 10 Connection Shown for LTC1266-3.3 and LTC1266-5; Changes Create LTC1266
+
–
16
4
1
3
15 PGND
BDRIVE
TDRIVE
PINV
BINH
2
PWR V
IN
R
S
Q
–
+
C
V
TRIP
7
13k
I
TH
PINV
1.25V
11
5
REFERENCE
–
+
SHDN
V
IN
V
OS
–
+
V
G
9
SENSE
+
10
ADJUSTABLE
VERSION
V
FB
100k
5pF
–
+
V
TH1
T
–
+
V
TH2
S
SLEEP
12
SIGNAL
GROUND
6
C
T
OFF-TIME
CONTROL
MAX
ON-TIME
CONTROL
ENABLE
V
SENSE
–
V
FB
SENSE
–
8
LTC1266 FD
LB
OUT
LB
IN
V
IN
14
–
+
LB
13
1.25V
REFERENCE
OPERATIOU
The LTC1266 series uses a current mode, constant off-
time architecture to synchronously switch an external pair
of power MOSFETs. Operating frequency is set by an
external capacitor at the timing capacitor Pin 6.
The output voltage is sensed by an internal voltage divider
connected to Sense
–
, Pin 8, (LTC1266-3.3 and LTC1266-
5) or external divider returned to V
FB
, Pin 10, (LTC1266).
A voltage comparator V, and a gain block G, compare the
divided output voltage with a reference voltage of 1.25V.
To optimize efficiency, the LTC1266 automatically switches
between two modes of operation, burst and continuous.
The voltage comparator is the primary control element
when the device is in Burst Mode
operation, while the gain
block controls the output voltage in continuous mode.
During the switch ON cycle in continuous mode, current
comparator C monitors the voltage between Pins 8 and 9
connected across an external shunt in series with the
inductor. When the voltage across the shunt reaches its
threshold value, the topside driver output is switched to
turn off the topside MOFSET (Power V
IN
for P-channel or
ground for N-channel). The timing capacitor connected to
Pin 6 is now allowed to discharge at a rate determined by
the off-time controller. The discharge current is made
proportional to the output voltage (measured by Pin 8) to
model the inductor current, which decays at a rate which
is also proportional to the output voltage. While the timing
capacitor is discharging, the bottom-side drive output is
switched to power V
IN
to turn on the bottom-side
N-channel MOSFET.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1266-5 | Synchronous Regulator Controller for N- or P-Channel MOSFETs |
| LTC1266ACS | Synchronous Regulator Controller for N- or P-Channel MOSFETs |
| LTC1266CS | Synchronous Regulator Controller for N- or P-Channel MOSFETs |
| LTC1266CS-3.3 | Synchronous Regulator Controller for N- or P-Channel MOSFETs |
| LTC1266CS-5 | Synchronous Regulator Controller for N- or P-Channel MOSFETs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1266ACS | 功能描述:IC REG CTRLR BST 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 |
| LTC1266ACS#PBF | 功能描述:IC REG CTRLR BST 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 |
| LTC1266ACS#TR | 功能描述:IC REG CTRLR BST 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 |
| LTC1266ACS#TRPBF | 功能描述:IC REG CTRLR BST 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 |
| LTC1266AIS | 功能描述:IC REG CTRLR BST 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 |
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