參數(shù)資料
型號： LTC3701
廠商： Linear Technology Corporation
英文描述： 16-Bit Universal Bus Driver With 3-State Outputs 48-SSOP -40 to 85
中文描述： 2相，低輸入電壓，雙通道降壓DC / DC控制器
文件頁數(shù)： 1/20頁
文件大小： 250K
代理商： LTC3701
1
LTC3701
3701fa
APPLICATIU
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIOU
2-Phase, Low Input Voltage,
Dual Step-Down DC/DC Controller
The LTC
3701 is a 2-phase dual constant frequency cur-
rent mode step-down DC/DC controller providing excellent
load and line regulation. Power loss and noise due to ESR
of the input capacitor are minimized by operating the two
controller output stages out-of-phase.
The LTC3701 provides a 0.8V
±
2% voltage reference and
consumes only 460
μ
A of quiescent current. To further
maximize the life of a battery source, the external
P-channel MOSFET is turned on continuously in dropout
(100% duty cycle).
Switching frequency is internally set at 550kHz, allowing
the use of small inductors and capacitors. For noise sen-
sitive applications, the LTC3701 can be externally syn-
chronized using its phase-locked loop. The frequency can
also be externally set from 300kHz to 750kHz by applying
a voltage to the PLLLPF pin. Burst Mode operation is inhib-
ited during synchronization or when the EXTCLK/MODE
pin is pulled low to reduce noise and RF interference.
The LTC3701 contains independent internal soft-start
circuitry for each controller. Other features include a
power good output voltage monitor and output overvolt-
age and short-circuit protection.
The LTC3701 is available in a small footprint 16-lead nar-
row SSOP package.
I
Out-of-Phase Controllers Reduce Required
Input Capacitance
I
True PLL for Frequency Locking or Frequency
Adjustment
I
Operating Frequency Range: 300kHz to 750kHz
I
Wide V
IN
Range: 2.5V to 10V
I
Constant Frequency Current Mode Architecture
I
Low Dropout: 100% Duty Cycle
I
Power Good Output Voltage Monitor
I
Internal Soft-Start Circuitry
I
Selectable Burst Mode
/Pulse Skipping Operation
at Light Loads
I
Output Overvoltage Protection
I
Low Quiescent
Current: 460
μ
A
I
0.8V
±
2% Voltage Reference
I
Small 16-Lead Narrow SSOP Package
I
One or Two Lithium-Ion Powered Applications
I
Notebook and Handheld Computers
I
Personal Digital Assistants
I
Portable Instruments
I
Distributed DC Power Systems
Figure 1. High Efficiency 2-Phase 550kHz Dual Step-Down Converter
Efficiency vs Load Current
+
+
SENSE1
–
V
FB1
I
TH
/RUN1
SGND
I
TH
/RUN2
V
FB2
PLLLPF
SENSE2
–
SENSE1
+
V
IN
PGATE1
PGND
PGATE2
PGOOD
EXTCLK/MODE
SENSE2
+
1
3
2
4
6
5
7
8
16
15
14
13
12
11
10
9
LTC3701
220pF
220pF
10k
10k
D1, D2: IR10BQ015 L1, L2: LQN6C-4R7 M1, M2: FDC638P
78.7k
80.6k
100k
169k
L1
4.7
μ
H
47
μ
F
10
μ
F
47
μ
F
0.03
0.03
L2
4.7
μ
H
D1
M1
M2
D2
3701 F01a
V
2.5V
2A
V
2.5V TO 9.8V
V
1.8V
2A
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
LOAD CURRENT (mA)
60
E
80
100
50
70
90
1
100
1000
10000
3701 F01b
40
10
V
IN
= 3.3V
V
IN
= 8.4V
V
OUT
= 2.5V
V
IN
= 4.2V
V
IN
= 6V
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3701EGN 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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)
LTC3701EGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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
LTC3701EGN#TR 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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)
LTC3701EGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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)
LTC3701EGNPBF 制造商:Linear Technology 功能描述:DC-DC Controller Dual Step-Dn 10V SSOP16
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