BQ24770_15 Datasheet, PDF (1/11 Pages) Texas Instruments – bq2477x NVDC Battery Charge Controller With System Power Monitor and Processor Hot Indicator

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bq24770, bq24773
SLUSCB0 – MAY 2015
bq2477x NVDC Battery Charge Controller With System Power Monitor
and Processor Hot Indicator
1 Features
•1 Host-controlled NVDC-1 1S-4S Battery Charge
Controller with 4.5-24 V Input Range
– Support SMBus (bq24770) and I2C (bq24773)
– System Instant-on Operation with no Battery or
Deeply Discharged Battery
– Supplement Mode with Synchronous BATFET
Control when Adaptor is fully loaded
• Ultra Fast Input Current DPM at 100 μs
• Ultra Low Quiescent Current of 600 µA and High
PFM Light Load Efficiency >80% at 20 mA Load
to Meet Energy Star and ErP Lot6.
• High Accuracy Power / Current Monitor for CPU
Throttling
– Comprehensive PROCHOT Profile
– Input and Battery Current Monitor (IADP/IBAT)
– System Power Monitor (PMON)
• Programmable Input Current Limit, Charge
Voltage, Charge Current and Minimum System
Voltage Regulation
– ±0.5% Charge Voltage (16 mV/step)
– ±2% Input/charge Current (64 mA/step)
– ±2% 40x Input / 16x Discharge / 20x Charge
Current Monitor
• Support Battery LEARN Function
• High Integration
– NMOS ACFET and RBFET Driver
– PMOS battery FET Gate Driver
– Internal Loop Compensation
– Independent Comparator
– Automatic Trickle Charge to Wake up Gas
Gauge
• 600kHz to 1.2MHz Programmable Switching
Frequency
2 Applications
• Ultrabook, Notebook, Detachable, and Tablet PC
• Handheld Terminal
• Industrial, Medical, Portable Equipment
3 Description
The bq2477x is high-efficiency, synchronous, NVDC-
1 battery charge controllers, offering low component
count for space-constraint, multi-chemistry battery
charging applications.
The power path management allows the system to be
regulated at battery voltage but does not drop below
system minimum voltage (programmable). With this
feature, the system keeps operating even when the
battery is completely discharged or removed. The
power path management allows the battery to provide
supplement current to the system to keep the input
supply from being overloaded.
The bq2477x provides drivers and power path
management for N-channel ACFET and reverse
blocking FET. The devices provides driver to control
NVDC operation of external P-channel battery FET. It
also drives high-side and low-side MOSFETs of the
switching regulator.
The bq2477x monitors adapter current (IADP),
battery charge/discharge current (IBAT) and system
power (PMON). The flexibly programmed PROCHOT
output goes directly to CPU for throttle back when
needed.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq24770
bq24773
WQFN (28-Pin)
4.00mm x 4.00mm²
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
Adapter
4.5-24V
N-FET Driver
RAC
Enhanced Safety:
OCP, OVP, FET Short
Adapter Detection
Bq24770
SMBus Controls V and I
with high accuracy
SMBus
NVDC Charge
Controller
HOST
IADP, IDCHG,
PMON, PROCHOT
SYS
P-FET Driver
R_SR
1
Light Load Efficiency (V_IN = 19.5 V)
100
95
90
85
80
75
70
65
60
55
50
0
0.02
VSYS = 9.0V
VSYS = 13.5V
0.04 0.06 0.08 0.1
System Load Current (A)
0.12
0.14
D003
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.