BQ24650 Datasheet, PDF (1/33 Pages) Texas Instruments – Synchronous Switch-Mode Battery Charge Controller for Solar Power With Maximum Power Point Tracking

bq24650
www.ti.com
SLUSA75 – JULY 2010
Synchronous Switch-Mode Battery Charge Controller for Solar Power
With Maximum Power Point Tracking
Check for Samples: bq24650
FEATURES
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• Maximum Power Point Tracking (MPPT)
Capability by Input Voltage Regulation
• Programmable MPPT Setting
• 5V-28V Input Solar Panel
• 600kHz NMOS-NMOS Synchronous Buck
Controller
• Resistor Programmable Float Voltage
• Accommodates Li-Ion/Polymer, LiFePO4, Lead
Acid Chemistries
• Accuracy
– ±0.5% Charge Voltage Regulation
– ±3% Charge Current Regulation
– ±0.6% Input Voltage Regulation
• High Integration
– Internal Loop Compensation
– Internal Digital Soft Start
• Safety
– Input Over-Voltage Protection
– Battery Temperature Sensing
– Battery Absent Detection
– Thermal Shutdown
• Charge Status Outputs for LED or Host
Processor
• Charge Enable on MPPSET Pin
• Automatic Sleep Mode for Low Power
Consumption
– <15mA Off-State Battery Discharge Current
• Small 3.5 × 3.5 mm² QFN-16 Package
APPLICATIONS
• Solar Powered Applications
• Remote Monitoring Stations
• Portable Handheld Instruments
• 12V to 24V Automotive Systems
• Current-Limited Power Source
DESCRIPTION
The bq24650 is a highly integrated switch-mode
battery charge controller. It provides input voltage
regulation, which reduces charge current when input
voltage falls below a programmed level. When the
input is powered by a solar panel, the input regulation
loop lowers the charge current so that the solar panel
can provide maximum power output.
The bq24650 offers a constant-frequency
synchronous PWM controller with high accuracy
current and voltage regulation, charge
preconditioning, charge termination, and charge
status monitoring.
The bq24650 charges the battery in three phases:
pre-conditioning, constant current, and constant
voltage. Charge is terminated when the current
reaches 1/10 of the fast charge rate. The pre-charge
timer is fixed at 30 minutes. The bq24650
automatically restarts the charge cycle if the battery
voltage falls below an internal threshold and enters a
low quiescent current sleep mode when the input
voltage falls below the battery voltage.
The bq24650 supports a battery from 2.1V to 26V
with VFB set to a 2.1V feedback reference. The
charge current is programmed by selecting an
appropriate sense resistor. The bq24650 is available
in a 16 pin, 3.5×3.5 mm² thin QFN package.
16 15 14 13
VCC ₁
MPPSET 2
STAT1 3
PAS
bq24650
12 REGN
11 GND
10 ^SRP
TS 4
9 SRN
56 7 8
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated