LINEAR TECHNOLOGY LTC1733 User's Manual
Summary
The LTC1733 is a versatile standalone linear charger designed for single-cell lithium-ion batteries. This comprehensive manual details its advanced charging capabilities, including programmable current and voltage control, internal thermal regulation using an on-chip MOSFET, and automatic power management features. It eliminates the need for external resistors or blocking diodes. Perfect for embedded systems like handheld computers, digital cameras, and cellular devices requiring reliable and safe Li-Ion battery conditioning.
Page 1 Text Content
LTC1733
Monolithic Linear
Lithium-Ion Battery Charger with
Thermal Regulation
FEATURES DESCRIPTIO Complete Linear Charger for 1-Cell Lithium-Ion The LTC®1733 is a standalone constant-current/ Batteries constant-voltage linear charger for lithium-ion batteries Thermal Regulation Maximizes Charging Rate with an on-chip power MOSFET. Internal thermal feedback without Risk of Overheating* regulates the charge current to limit die temperature
No External MOSFET, Sense Resistor or Blocking during high power operation or high ambient temperature Diode Required conditions. This feature allows the user to program a high Up to 1.5A Charge Current charge current without risk of damaging the LTC1733 or Preset Charge Voltage with 1% Accuracy the handheld product.
Programmable Charge Current with 7% Accuracy
No external current sense resistor is needed and no
Programmable Charge Termination Timer
blocking diode is required due to the internal MOSFET
Tiny Thermally Enhanced 10-Pin MSOP Package
architecture. The charge current and charge time can be
Charge Current Monitor Useful for Gas Gauging*
set externally with a single resistor and capacitor, respec-
C/10 Charge Current Detection Output CH AR GE UR RE NT (m A)
tively. When the input supply (wall adapter) is removed,
Automatic Recharge
the LTC1733 automatically enters a low current sleep
Thermistor Input for Temperature Qualified Charging
mode, dropping the battery drain current to less than 5µA.
AC Present Logic Output
4.1V/4.2V Pin Selectable Output Voltage The LTC1733 also includes NTC temperature sensing, C/10 detection circuitry, AC present logic, 4.1V/4.2V pin selectability and low battery charge conditioning (trickle
APPLICATIO S
charging).
Cellular Telephones The LTC1733 is available in a 10-pin thermally enhanced Handheld Computers MSOP package. Digital Still Cameras , LTC and LT are registered trademarks of Linear Technology Corporation.
Charging Docks and Cradles *Patent Pending
TYPICAL APPLICATIO
Charge Current vs Battery Voltage
Standalone Li-Ion Battery Charger
TA = 0°C CONSTANT
VIN = 5V
CURRENT
TA = 40°C
TA = 25°C
SEL VCC IBAT = 1A
4.7µF BAT CONSTANT 4.2V POWER
LTC1733
1-CELL
PROGTIMER CONSTANT
Li-Ion
VOLTAGE
GND NTC BATTERY*
TRICKLE CHARGE VIN = 5V
1733TA01
θJA = 40°C/W
*AN OUTPUT CAPACITOR MAY BE REQUIRED
DEPENDING ON BATTERY LEAD LENGTH BATTERY VOLTAGE (V) 1733 TA01b
sn1733 1733fs
Page Summary Contents For LINEAR TECHNOLOGY LTC1733 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 170.37 KB |
| Published | May 29, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
What maximum charging capability does this charger support?
It can handle programmability up to 1.5A and features a charge current monitor output.
Is an external MOSFET or sense resistor required for operation?
No, the design eliminates the need for external MOSFETs, sense resistors, or blocking diodes.
How does the charger manage overheating during charging cycles?
It uses internal thermal feedback to regulate the charge current, which prevents damage due to high temperatures.