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The DC1589A is a constant-current/constant-voltage linear charger circuit 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 50mO on-resistance making it suitable for high peak-power/low average power applications.
The LTC4425 charges the output capacitors to an externally programmed output voltage in LDO mode at a constant charge current, or to VIN in normal mode with a smart charge current profile to limit the inrush current until the VIN to VOUT differential is less than 250mV. In addition the LTC4425 IC can be set to clamp the output voltage to 4.9V or 5.4V.
The Charge current (VOUT current limit) is programmed by connecting a resistor between PROG and GND. The voltage on the PROG pin represents the current flowing 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)
Manufacturer | Analog Devices Inc. |
---|---|
Category | Power Management |
Sub-Category | Capacitor Chargers |
Eval Board Part Number | 505-DC1589A-ND |
Eval Board Supplier | Analog Devices Inc. |
Eval Board |
Normally In Stock
|
Capacitor Type |
Super Capacitor
|
Function |
Charger Controller
|
Number of Capacitors |
2
|
Voltage In |
2.7 ~ 5.5 V
|
Voltage Out (Max) |
5.4 V
|
Charge Current (Max) |
2 A
|
Topology |
Linear
|
Features |
Adjustable Output Current
Adjustable Output Voltage Automatic Cell Balancing Power Good Indicator Undervoltage Protection |
Quiescent Current |
20 µA
|
Component Count + Extras |
17 + 33
|
Main I.C. Base Part |
LTC4425
|
Design Author |
Linear Technology
|
Date Created By Author | 2009-11 |
Date Added To Library | 2019-05 |
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Orders are typically delivered to China within 4 days depending on location.
Free delivery to China on orders of $100 USD or more. A delivery charge of $30 USD will be billed on all orders less than $100 USD.
CPT if prepay and add, FCA Thief River Falls if billing to a shipper account as defined by INCOTERMS 2010
Customer is responsible for all applicable duties, tariffs, brokerage fees and taxes
Credit account for qualified institutions and businesses
Payment in Advance by Wire Transfer
More Products From Fully Authorized Partners
Average Time to Ship 1-3 Days, extra ship charges may apply. Please see product page, cart, and checkout for actual ship speed.
Incoterms: CPT (Duty, customs, and applicable VAT/Tax due at time of delivery)
For more information visit Help & Support
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