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Description
DC1229B is a 2A monolithic Li-Ion battery charger featur-
ing the LT
3650EDD-4.2/LT3650EDD-4.1. The LT3650 is a
®
complete mid-power Li-Ion battery charger that can operate
over a wide input voltage range. The circuit provides CC/CV
charging with a maximum charge current externally pro-
grammable up to 2A. A precondition feature trickle charges
a low-voltage battery and bad battery detection provides
perForMAnce sUMMArY
PARAMETER
Input Voltage Range
V
OUT
Output Float Voltage
Output Current Limit I
LIM
LT3650 is a complete monolithic mid-power Li-Ion battery
charger, addressing high input voltage applications with
solutions that require a minimum of external components.
The IC uses a 1MHz constant frequency, average-current
mode step-down architecture. Internal reverse voltage
protection allows direct connection to the input supply
without a blocking diode for single-cell applications
(LT3650-4.2/LT3650-4.1).
NOTE: A blocking diode on the input supply connection
is recommended to prevent the input from ringing below
ground with a battery on the output.
The LT3650 incorporates a 2A switch that is driven by a
bootstrapped supply to maximize efficiency during charg-
ing cycles. Wide input range allows operation to full charge
from 5V ±5% (single cell) to 36V. A precision-threshold
shutdown pin allows incorporation of UVLO functionality
using a simple resistor-divider. The IC can also be put into
DEMO MANUAL DC1229B
LT3650EDD-4.2/LT3650EDD-4.1
a signal if the battery doesn't respond to preconditioning.
The LT3650EDD is available in a 12-lead (3mm × 3mm)
DFN surface mount package with an exposed pad.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
(T
= 25°C)
A
CONDITIONS
Constant Voltage Mode
R
= 20kΩ
RNG
a low-current shutdown mode, in which the input supply
bias is reduced to only 15µA.
The LT3650 incorporates several degrees of charge current
control freedom. The overall maximum charge current is
set using an external inductor current sense resistor. A
maximum charge current programming pin allows dynamic
manipulation of the battery charge current. The LT3650
also incorporates a system input-supply current limit
control feature that servos the battery charge current to
accommodate overall system load requirements.
The LT3650 automatically enters a battery precondition
mode if the sensed battery voltage is very low. In this mode,
the charging current is reduced to 15% of the programmed
maximum, as set by the inductor sense resistor, R
Once the battery voltage climbs above an internally set
threshold of 2.9V/cell, the IC automatically increases
maximum charging current to the full programmed value.
2A Monolithic Li-Ion
Battery Chargers
VALUE
7.5V to 32V
3.7V to 4.24V
4.2V/4.1V
2A
.
SENSE
dc1229bf
1
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Summary of Contents for Linear Technology DC1229B
- Page 1 2A. A precondition feature trickle charges L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear a low-voltage battery and bad battery detection provides Technology Corporation. All other trademarks are the property of their respective owners.
- Page 2 DEMO MANUAL DC1229B operAting principles The LT3650 can use a charge-current based ‘C/10’ termina- voltage, the LT3650 engages an automatic charge cycle tion scheme, which ends a charge cycle when the battery restart. The IC also automatically restarts a new charge...
- Page 3 DEMO MANUAL DC1229B qUick stArt proceDUre 9. Set JP1 to RUN. Connect a jumper from the NTC pin to 11. Turn on LOAD1 and set to 1A. Verify the voltage, ground. Verify the charging current, I , is less than...
- Page 4 DEMO MANUAL DC1229B pArts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components Capacitor, X7R, 1µF , 50V, 10%, 0805 Murata, GRM21BR71H105KA12B C3, C6 Capacitor, X7R, 4.7µF , 50V, 10%, 1210 Murata, GRM32R71H475KA091B Capacitor, X7R, 10µF , 10V, 10%, 0805...
- Page 5 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
- Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
- Page 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1229B-A...
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