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參數資料
| 型號： | LTC1874 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 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) |
| 中文描述： | 雙恒定頻率電流模式降壓DC / DC控制器（雙路電壓（3.3V，1.8V的輸出），恒定頻率，電流模式，步降式DC / DC控制器） |
| 文件頁數： | 1/12頁 |
| 文件大?。?/td> | 180K |
| 代理商： | LTC1874 |
1
LTC1874
FEATURES
APPLICATIU
TYPICAL APPLICATIO
N
U
DESCRIPTIOU
The LTC
1874 is a dual constant frequency current mode
step-down DC/DC controller with excellent AC and DC load
and line regulation. Each controller has an accurate
undervoltage lockout that shuts down the individual con-
troller when the input voltage falls below 2.0V.
The LTC1874 boasts
±
2.5% output voltage accuracy and
consumes only 270
μ
A of quiescent current per controller.
The LTC1874 is configured with Burst Mode operation,
which enhances efficiency at low output current for appli-
cations where efficiency is a prime consideration.
To further maximize the life of a battery source, each
external P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). In shutdown, each controller
draws a mere 8
μ
A. High constant operating frequency of
550kHz allows the use of small external inductors.
The LTC1874 is available in a small footprint 16-lead
narrow SSOP.
Dual Constant Frequency
Current Mode Step-Down
DC/DC Controller
Figure 1. LTC1874 3.5V-9.5V Input to 3.3V/1A and 1.8V/1A Dual Step-Down Converter
I
1- or 2-Cell Lithium-Ion-Powered Applications
I
Personal Information Appliances
I
Portable Computers
I
Distributed 3.3V, 2.5V or 1.8V Power Systems
I
High Efficiency: Up to 94%
I
High Output Currents Easily Achieved
I
Wide V
IN
Range: 2.5V to 9.8V
I
Constant Frequency 550kHz Operation
I
Burst Mode
TM
Operation at Light Load
I
Low Dropout: 100% Duty Cycle
I
0.8V Reference Allows Low Output Voltages
I
Current Mode Operation for Excellent
Line and Load Transient Response
I
Low Quiescent Current: 270
μ
A (Each Controller)
I
Separate Shutdown Pin for Each Controller
I
Shutdown Mode Draws Only
8
μ
A Supply Current (Each Controller)
I
±
2.5% Reference Accuracy
I
Available in 16-Lead Narrow SSOP
I
Each Controller Functions Independent of the Other
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
V
IN1
SENSE1
–
GND1
V
FB1
I
TH
/RUN1
PGND1
PGATE1
PV
IN1
8
7
6
5
12
11
10
9
1
2
3
4
13
14
15
16
PV
IN2
PGATE2
PGND2
I
TH
/RUN2
V
FB2
GND2
SENSE2
–
V
IN2
LTC1874
10k
220pF
M2
D2
C2
47
μ
F
6V
R2
0.04
L2
4.7
μ
H
220pF
10k
R1
0.04
80.6k
1874 TA01
100k
V
1.8V
1A
+
80.6k
249k
C1
47
μ
F
6V
C1, C2: SANYO POSCAP 6TPA47M
C
: TAIYO YUDEN CERAMIC
EMK325BJ106MNT (
×
2)
D1, D2: MBRM120
L1, L2: COILCRAFT D01608C-472
M1, M2: Si3443DV
R1, R2: DALE 0.25W
L1
4.7
μ
H
+
C
IN
10
μ
F
16V
×
2
V
IN
3.5V
TO 9.5V
D1
M1
V
OUT1
1A
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相關代理商/技術參數 |
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| LTC1874EGN | 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:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數: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) |
| LTC1874EGN#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:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數: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) |
| LTC1874EGN#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:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數: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) |
| LTC1874EGN#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:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數: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) |
| LTC1875EGN | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
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