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參數(shù)資料
| 型號： | LTC1871 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Quadruple 2-Input Positive-AND Gate 14-TVSOP -40 to 85 |
| 中文描述： | 寬輸入范圍，無檢測電阻電流模式升壓，反激和SEPIC控制器 |
| 文件頁數(shù)： | 1/36頁 |
| 文件大小： | 411K |
| 代理商： | LTC1871 |
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1
LTC1871
Wide Input Range, No R
SENSE
TM
Current Mode Boost, Flyback and SEPIC Controller
The LTC
1871 is a wide input range, current mode, boost,
flyback and SEPIC controller that drives an N-channel
power MOSFET and requires very few external compo-
nents. Intended for low to medium power applications, it
eliminates the need for a current sense resistor by utiliz-
ing the power MOSFET’s on-resistance, thereby maximiz-
ing efficiency.
The IC’s operating frequency can be set with an external
resistor over a 50kHz to 1MHz range, and can be synchro-
nized to an external clock using the MODE/SYNC pin.
Burst Mode operation at light loads, a low minimum
operating supply voltage of 2.5V and a low shutdown
quiescent current of 10
μ
A make the LTC1871 ideally
suited for battery-operated systems.
For applications requiring constant frequency operation,
Burst Mode operation can be defeated using the MODE/
SYNC pin. Higher output voltage boost, SEPIC and fly-
back applications are possible with the LTC1871 by
connecting the SENSE pin to a resistor in the source of the
power MOSFET.
The LTC1871 is available in the 10-lead MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
High Efficiency (No Sense Resistor Required)
I
Wide Input Voltage Range: 2.5V to 36V
I
Current Mode Control Provides Excellent
Transient Response
I
High Maximum Duty Cycle (92% Typ)
I
±
2% RUN Pin Threshold with 100mV Hysteresis
I
±
1% Internal Voltage Reference
I
Micropower Shutdown: I
Q
= 10
μ
A
I
Programmable Operating Frequency
(50kHz to 1MHz) with One External Resistor
I
Synchronizable to an External Clock Up to 1.3
×
f
OSC
I
User-Controlled Pulse Skip or Burst Mode
Operation
I
Internal 5.2V Low Dropout Voltage Regulator
I
Output Overvoltage Protection
I
Capable of Operating with a Sense Resistor for High
Output Voltage Applications
I
Small 10-Lead MSOP Package
I
Telecom Power Supplies
I
Portable Electronic Equipment
Burst Mode is a registered trademark of Linear Technology Corporation.
No R
SENSE
is a trademark of Linear Technology Corporation.
Figure 1. High Efficiency 3.3V Input, 5V Output Boost Converter (Bootstrapped)
Efficiency of Figure 1
OUTPUT CURRENT (A)
30
0.001
E
90
100
80
50
70
60
40
0.1
1
10
1871 F01b
0.01
Burst Mode
OPERATION
PULSE-SKIP
MODE
DESCRIPTIOU
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
+
RUN
I
TH
FB
FREQ
MODE/SYNC
SENSE
V
IN
INTV
CC
GATE
GND
LTC1871
R
80.6k
1%
R2
37.4k
1%
R1
12.1k
1%
C
VCC
4.7
μ
F
X5R
C
IN
22
μ
F
6.3V
×
2
M1
D1
L1
1
μ
H
R
C
22k
C
6.8nF
C
47pF
C
OUT1
150
μ
F
6.3V
×
4
V
3.3V
V
OUT
5V
7A
(10A PEAK)
GND
1871 F01a
+
C
OUT2
22
F
6.3V
X5R
×
2
C
IN
:
C
OUT1
: TAIYO YUDEN JMK325BJ226MM
C
OUT2
: TAIYO YUDEN JMK325BJ226MM
D1: MBRB2515L
L1: SUMIDA CEP125-H 1R0MH
M1: FAIRCHILD FDS7760A
相關(guān)PDF資料 |
PDF描述 |
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| LTC1871-7 | Quadruple 2-Input Positive-AND Gate 14-SOIC -40 to 85 |
| LTC1871EMS | Quadruple 2-Input Positive-AND Gate 14-SO -40 to 85 |
| LTC1873EG | Quadruple 2-Input Positive-AND Gate 14-TSSOP -40 to 85 |
| LTC1873 | Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID(550kHz,雙 路,同步2相開關(guān)穩(wěn)壓器(帶5位VID)) |
| LTC1874 | Dual Constant Frequency Current Mode Step-Down DC/DC Controller(雙路(3.3V,1.8V輸出）恒定頻率，電流模式，步降DC/DC控制器) |
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| LTC1871EMS | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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) |
| LTC1871EMS#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC1871EMS#TR | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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) |
| LTC1871EMS#TRPBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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) |
| LTC1871EMS-1#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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) |
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