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LTC4425EDD

更新时间： 2024-11-13 05:43:59
品牌 Logo 应用领域
凌特 - Linear 二极管电容器监控
页数 文件大小 规格书
20页 241K
描述
Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor

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LTC4425EDD 数据手册

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Electrical Specifications Subject to Change  
LTC4425  
Linear SuperCap Charger  
with Current-Limited Ideal  
Diode and V/I Monitor  
DESCRIPTION  
FEATURES  
TheLTC®4425isaconstant-current/constant-voltagelinear  
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  
n
50mΩ Ideal Diode from V to V  
IN  
OUT  
n
Smart Charge Current Profile Limits Inrush Current  
Internal Cell Balancer (No External Resistors)  
Programmable Output Voltage (LDO Mode)  
n
n
n
n
Programmable V to V  
Current Limit  
IN  
OUT  
Continuous Monitoring of V to V  
Current via  
IN  
OUT  
PROG Pin  
n
n
n
Low Quiescent Current: 20μA  
V Power Fail, PGOOD Indicator  
chargecurrent,ortoV innormalmodewithasmartcharge  
IN  
IN  
2.45V/2.7V Cell Protection Shunts  
currentprofiletolimittheinrushcurrentuntiltheV toV  
IN  
OUT  
(4.9V/5.4V SuperCap Max Top-Off Voltage)  
3A Peak Current Limit, Thermal Limiting  
Tiny Application Circuit, 3mm × 3mm × 0.75mm DFN  
and 12-Lead MSOP Packages  
differential is less than 250mV. In addition the LTC4425 can  
n
n
be set to clamp the output voltage to 4.9V or 5.4V.  
Charge current (V  
current limit) is programmed by  
OUT  
connecting a resistor between PROG and GND. The  
voltage on the PROG pin represents the current flowing  
APPLICATIONS  
from V to V  
for current monitoring. An internal active  
IN  
OUT  
n
High Peak Power Battery/USB Powered Equipment  
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 profile 12-pin  
3mm × 3mm DFN or a 12-lead MSOP package.  
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.  
TYPICAL APPLICATION  
Charging 2-Cell Series Supercapacitor from Li-Ion Source  
Charge Current vs VIN to VOUT  
0.6  
V
= V  
IN  
FULL CHARGE CURRENT  
FB  
V
  V  
IN  
OUT  
V
IN  
TO HIGH PEAK  
POWER LOAD  
0.5  
0.4  
0.3  
0.2  
0.1  
0
Li-Ion  
1F  
1.5M  
PFI  
V
MID  
1F  
V
CURRENT LIMITED  
BY PMOS RDSON  
+
–
IN  
FB  
1.2M  
1/10 CHARGE  
CURRENT  
470k  
PFI_RET  
LTC4425  
PFO  
IDEAL DIODE  
FORWARD VOLTAGE = 15mV  
PROG  
I
MONITOR  
SEL  
EN  
2.45V/2.7V  
0
0.2  
0.4  
– V  
0.6  
(V)  
0.8  
1
2k  
V
IN  
OUT  
GND  
4425 TA02  
4425 TA01  
4425p  
1
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