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bq24770, bq24773
SLUSCB0 –MAY 2015
bq2477x NVDC Battery Charge Controller With System Power Monitor
and Processor Hot Indicator
1 Features
2 Applications
1
•
Host-controlled NVDC-1 1S-4S Battery Charge
Controller with 4.5-24 V Input Range
•
•
•
Ultrabook, Notebook, Detachable, and Tablet PC
Handheld Terminal
–
–
Support SMBus (bq24770) and I2C (bq24773)
Industrial, Medical, Portable Equipment
System Instant-on Operation with no Battery or
Deeply Discharged Battery
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.
–
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.
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.
•
High Accuracy Power / Current Monitor for CPU
Throttling
–
–
–
Comprehensive PROCHOT Profile
Input and Battery Current Monitor (IADP/IBAT)
System Power Monitor (PMON)
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.
•
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)
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.
±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
Device Information(1)
PART NUMBER
bq24770
PACKAGE
BODY SIZE (NOM)
WQFN (28-Pin)
4.00mm x 4.00mm2
bq24773
Automatic Trickle Charge to Wake up Gas
Gauge
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
•
600kHz to 1.2MHz Programmable Switching
Frequency
4 Simplified Schematic
Light Load Efficiency (VIN = 19.5 V)
RAC
Adapter
4.5-24V
Enhanced Safety:
OCP, OVP, FET Short
100
95
90
85
80
75
70
65
60
N-FET Driver
SYS
Adapter Detection
Bq24770
P-FET Driver
SMBus Controls V and I
with high accuracy
NVDC Charge
Controller
R
SR
SMBus
HOST
IADP, IDCHG,
PMON, PROCHOT
VSYS = 9.0V
VSYS = 13.5V
55
50
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
D003
System Load Current (A)
1
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.