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參數(shù)資料
| 型號： | LTC3700EMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Constant Frequency Step-Down DC/DC Controller with LDO Regulator |
| 中文描述： | 1 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 209K |
| 代理商： | LTC3700EMS |
1
LTC3700
3700f
LOAD CURRENT (mA)
1
E
90
86
82
78
74
66
62
58
54
50
10
100
1000
3700 F01a
V
OUT
= 1.8V
R
SENSE
= 0.068
V
IN
= 3.3V
V
IN
= 5V
V
IN
= 4.2V
Constant Frequency
Step-Down DC/DC Controller
with LDO Regulator
DESCRIPTIOU
The LTC
3700 is a constant frequency current mode step-
down (buck) DC/DC controller with excellent AC and DC
load and line regulation. The on-chip 150mA low dropout
(LDO) linear regulator can be powered from the buck
controller’s input supply, its own independent input supply
or the buck regulator’s output. The buck controller incor-
porates an undervoltage lockout feature that shuts down the
controller when the input voltage falls below 2.1V.
The buck regulator provides a
±
2.5% output voltage accu-
racy. It consumes only 210
μ
A of quiescent current in nor-
mal operation with the LDO consuming an additional 50
μ
A.
In shutdown, a mere 10
μ
A (combined) is consumed.
For applications where efficiency is a prime consideration,
the buck controller is configured for Burst Mode operation
which enhances efficiency at low output current. To fur-
ther maximize the life of a battery source, the external
P-channel MOSFET is turned on continuously in dropout
(100% duty cycle). High constant operating frequency of
550kHz allows the use of a small external inductor.
The LDO is protected by both current limit and thermal
shutdown circuits.
The LTC3700 is available in a tiny 10-pin MSOP.
I
Notebook Computers
I
Portable Instruments
I
One or Two Li-Ion Battery-Powered Applications
I
Dual Output Regulator in Tiny 10-Pin MSOP
I
High Efficiency: Up to 94%
I
Wide V
IN
Range: 2.65V to 9.8V
I
Constant Frequency 550kHz Operation
I
150mA LDO Regulator with Current Limit and
Thermal Shutdown Protection
I
High Output Currents Easily Achieved
I
Burst Mode
Operation at Light Load
I
Low Dropout: 100% Duty Cycle
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
0.8V Reference Allows Low Output Voltages
I
Low Quiescent Current: 260
μ
A Total
I
Shutdown Mode Draws Only 10
μ
A Supply Current
I
Common Power Good Output for Both Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
+
SENSE
–
LTC3700
PGATE
V
FB
LDO
V
FB2
PGOOD
V
IN
V
IN2
I
TH
/RUN
GND
M1
L1
10
μ
H
C2
47
μ
F
6V
100k
80.6k
D1
10k
169k
C4
2.2
μ
F
16V
78.7k
V
2.5V AT
150mA
3700 F01
V
3.3V
V
OUT1
AT 1A
C1, C3: TAIYO YUDEN EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
C4: MURATA GRM42-6X7R225K016AL
D1: MOTOROLA MBRM120T3
L1: COILTRONICS UP1B-100
M1: Si3443DV
R1: DALE 0.25W
V
IN1
C3
10
μ
F
10V
C1
10
μ
F
10V
R1
0.068
220pF
Figure 1. High Efficiency 5V to 1.8V/1A Buck with 3.3V to 2.5V/150mA LDO
Buck Efficiency vs Load Current
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
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| LTC3700EMS#PBF | 功能描述:IC REG DL BUCK/LINEAR 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
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