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參數資料
| 型號： | LTC4425EDD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, DFN-12 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 239K |
| 代理商： | LTC4425EDD#PBF |
LTC4425
1
4425f
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Linear SuperCap Charger
with Current-Limited Ideal
Diode and V/I Monitor
The LTC4425 is a constant-current/constant-voltage linear
charger designed to charge a 2-cell supercap stack from
either a Li-Ion/Polymer battery, a USB port, or a 2.7V to
5.5V current-limited supply. The part operates as an ideal
diode with an extremely low 50mΩ on-resistance making it
suitableforhighpeak-power/lowaveragepowerapplications.
The LTC4425 charges the output capacitors to an externally
programmed output voltage in LDO mode at a constant
charge current, or to VINinnormalmodewithasmartcharge
current prole to limit the inrush current until the VINtoVOUT
differential is less than 250mV. In addition the LTC4425 can
be set to clamp the output voltage to 4.9V or 5.4V.
Charge current (VOUT current limit) is programmed by
connecting a resistor between PROG and GND. The
voltage on the PROG pin represents the current owing
from VIN to VOUT for current monitoring. An internal active
balancing circuit maintains equal voltages across each
supercapacitor and clamps the peak voltage across each
cell to a pin-selectable maximum value. The LTC4425
operates at a very low 20μA quiescent current (shutdown
current <3μA) and is available in a low prole 12-pin
3mm
× 3mm DFN or a 12-lead MSOP package.
Charging 2-Cell Series Supercapacitor from Li-Ion Source
APPLICATIONS
n 50mΩ Ideal Diode from VIN to VOUT
n Smart Charge Current Prole Limits Inrush Current
n Internal Cell Balancer (No External Resistors)
n Programmable Output Voltage (LDO Mode)
n Programmable VIN to VOUT Current Limit
n Continuous Monitoring of VIN to VOUT Current via
PROG Pin
n Low Quiescent Current: 20μA
n VIN Power Fail, PGOOD Indicator
n 2.45V/2.7V Cell Protection Shunts
(4.9V/5.4V SuperCap Max Top-Off Voltage)
n 3A Peak Current Limit, Thermal Limiting
n Tiny Application Circuit, 3mm
× 3mm × 0.75mm DFN
and 12-Lead MSOP Packages
n High Peak Power Battery/USB Powered Equipment
n Industrial PDAs
n Portable Instruments/Monitoring Equipment
n Power Meters, SuperCap Backup Circuits
n PC Card/USB Modems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LTC4425
GND
+
–
Li-Ion
VIN
VOUT VIN
VIN
IMONITOR
1.5M
1.2M
2.2μF
PFI
PFI_RET
SEL
FROM
μC
EN
2.45V/2.7V
2k
PROG
PFO
470k
FB
1F
TO HIGH PEAK
POWER LOAD
VMID
4425 TA01
+
VIN – VOUT (V)
CHARGE
CURRENT
(A)
0.6
0.5
4425 TA02
0
0.1
0.2
0.3
0.4
0
0.2
0.4
0.6
0.8
1
1/10 CHARGE
CURRENT
CURRENT LIMITED
BY PMOS RDSON
IDEAL DIODE
FORWARD VOLTAGE = 15mV
FULL CHARGE CURRENT
VFB = VIN
RPROG = 2k
Charge Current vs VIN to VOUT Differential
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC4425EMSE#PBF | 功能描述:IC SUPERCAP CHARGER 12-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 應用:熱電冷卻器 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.173"，4.40mm 寬）裸露焊盤 供應商設備封裝:28-TSSOP 裸露焊盤 包裝:管件 產品目錄頁面:1410 (CN2011-ZH PDF) |
| LTC4425EMSE#TRPBF | 功能描述:IC SUPERCAP CHRGR DIO/MON 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC4425IDD#PBF | 功能描述:IC SUPERCAP CHARGER 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC4425IDD#TRPBF | 功能描述:IC SUPERCAP CHRGR DIO/MON 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC4425IMSE#PBF | 功能描述:IC SUPERCAP CHARGER 12-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
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