- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377736 > LTC1266CS (LINEAR TECHNOLOGY CORP) Synchronous Regulator Controller for N- or P-Channel MOSFETs PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC1266CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Synchronous Regulator Controller for N- or P-Channel MOSFETs |
| 中文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁(yè)數(shù)： | 13/20頁(yè) |
| 文件大?。?/td> | 361K |
| 代理商： | LTC1266CS |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)當(dāng)前第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)
13
LTC1266
LTC1266-3.3/LTC1266-5
APPLICATIU
W
U
U
Figure 6. Low-Battery Comparator
–
+
1.25V
REFERENCE
LB
OUT
V
IN
R2
R1
LTC1266
LTC1266 F06
The divided down voltage at the “–” input to the comparator
is compared to an internal 1.25V reference. This reference
is separate from the 1.25V reference used by the voltage
comparator and current comparator for regulation and is
not disabled by the shutdown pin, therefore the low-battery
detection is operational even when the rest of the chip is
shut down. The comparator is functional down to an input
voltage of 2.5V. Thus, the output will provide a valid state
even when the rest of the chip does not have sufficient
voltage to operate. For best performance, the value of the
pull-up resistor should be high enough that the output is
pulled down to ground when sinking 200
μ
A or less.
Suppressing Burst Mode Operation
Normally, enabling Burst Mode operation is desired due to
its superior efficiency at low load currents (see Figure 7).
However, in certain applications it may be desirable to
inhibit this feature. Some reasons for doing so are:
1. To eliminate audible noise from certain types of induc-
tors at light loads.
Figure 7. Effect of Disabling Burst Mode Operation on Efficiency
2. If the load is never expected to drop low enough to
benefit from the efficiency advantages of Burst Mode
operation, the output capacitor ESR and minimum
capacitance requirements (which may falsely trigger
Burst Mode operation if not met) can be relaxed if Burst
Mode operation is disabled.
3. If an auxiliary winding is used. Disabling Burst Mode
operation guarantees switching independent of the
load on the primary. This allows power to be taken from
the auxiliary winding independently.
4. Tighter load regulation (< 1%).
Burst Mode operation is disabled by applying a CMOS
logic high voltage (>2.1V) to Pin 4. When it is disabled, the
voltage comparator limit is raised high enough so that it no
longer is involved in regulation; however it is still active
and is useful as a voltage clamp to keep the output from
overshooting.
Note that since the inductor current must reverse to
regulate the output at zero load when Burst Mode opera-
tion is disabled, the minimum inductance (L
MIN
) specified
during Inductor Core Selection is no longer applicable.
Checking Transient Response
The regulator loop response can be checked by looking at
the load transient response. Switching regulators take
several cycles to respond to a step in DC (resistive) load
current. When a load step occurs, V
OUT
shifts by an
amount equal to
I
LOAD
(ESR), where ESR is the effective
series resistance of C
OUT
.
I
LOAD
also begins to charge or
LOAD CURRENT
0
V
I
–
0
300
400
500
600
4
LTC1266 F05
200
100
0
1
2
3
5
TOPSIDE
N-CHANNEL WITH
CHARGE PUMP
TOPSIDE N-CHANNEL
WITH POWER V
IN
= 12V
TOPSIDE
P-CHANNEL
V
OUT
= 3.3V
LOAD CURRENT (A)
0.01
60
E
70
80
90
100
0.1
5
1
LTC1266 F07
Burst Mode OPERATION
ENABLED
Burst Mode OPERATION
INHIBITED
Figure 5. Comparison of Dropout Performance
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1266CS-3.3 | Synchronous Regulator Controller for N- or P-Channel MOSFETs |
| LTC1266CS-5 | Synchronous Regulator Controller for N- or P-Channel MOSFETs |
| LTC1267- ADJ | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| LTC1267- ADJ5 | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| LTC1267-ADJ5 | Circular Connector; No. of Contacts:37; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-35 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1266CS#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:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC1266CS#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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1266CS#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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1266CS-3.3 | 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 |
| LTC1266CS-3.3#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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。