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參數(shù)資料
| 型號： | LTC1875 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 15mA Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator |
| 中文描述： | 15mA的靜態(tài)電流1.5A的單片同步降壓型穩(wěn)壓器 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 257K |
| 代理商： | LTC1875 |
1
LTC1875
1875f
15
μ
A Quiescent Current
1.5A Monolithic Synchronous
Step-Down Regulator
DESCRIPTIOU
I
Portable Computers
I
Portable Instruments
I
Wireless Modems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
High Efficiency Step-Down Converter
I
High Efficiency: Up to 95%
I
Low Quiescent Current: Only 15
μ
A with No Load
I
550kHz Constant Frequency Operation
I
2.65V to 6V Input Voltage Range
I
V
OUT
from 0.8V to V
IN
, I
OUT
to 1.5A
I
True PLL Frequency Locking from 350kHz to 750kHz
I
Power Good Output Voltage Monitor
I
Low Dropout Operation: 100% Duty Cycle
I
Burst Mode
or Pulse Skipping Operation
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Shutdown Mode Draws <1
μ
A Supply Current
I
±
2% Output Voltage Accuracy
I
Overcurrent and Overtemperature Protected
I
Available in 16-Lead SSOP Package
The LTC
1875 is a high efficiency 1.5A monolithic syn-
chronous buck regulator using a constant frequency,
current mode architecture. Operating supply current is
only 15
μ
A with no load and drops to <1
μ
A in shutdown.
The input supply voltage range of 2.65V to 6V makes the
LTC1875 ideally suited for single Li-Ion battery-powered
applications. 100% duty cycle provides low dropout op-
eration, extending battery life in portable systems.
The switching frequency is internally set to 550kHz, allow-
ing the use of small surface mount inductors and capaci-
tors. For noise sensitive applications, the LTC1875 can be
externally synchronized from 350kHz to 750kHz. Burst
Mode operation is inhibited during synchronization or
when the SYNC/MODE pin is pulled low.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with a 0.8V feedback
reference voltage. The LTC1875 is available in a 16-lead
SSOP package.
RUN/SS
SYNC/MODE
LTC1875
PGOOD
I
TH
PV
IN
SWP
SWN
PGND
V
FB
SV
IN
28.0k
C
IN
: TAIYO YUDEN CERAMIC JMK325BJ226MM
C
: SANYO POSCAP 6TPA47M
L1: TOKO 646CY-6R8M
*V
OUT
CONNECTED TO V
IN
(MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V
IN
< 3.3V
1875 TA01
220pF
150k
88.7k
C
OUT
47
μ
F
V
*
3.3V
L1
6.8
μ
H
SGND
47pF
C
IN
22
μ
F
V
IN
2.65V TO 6V
+
Efficiency vs Output Load Current
OUPUT CURRENT (mA)
E
100
95
90
85
80
75
70
65
60
55
0.1
10
100
1875 TA01a
1
1000
Burst Mode OPERATION
V
= 3.3V
L = 6.8
μ
H
V
IN
= 4.2V
V
IN
= 6V
V
IN
= 3.6V
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):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(guān):- 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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1875EGN#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC1875EGN#TR | 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(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):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(guān):- 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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1875EGN#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):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(guān):- 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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1876EG | 功能描述:IC REG CTRLR BST PWM CM 36-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: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 |
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