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ISL6253 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer ISL6253
Beschreibung Highly Integrated Battery Charger
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 22 Seiten
ISL6253 Datasheet, Funktion
®
Data Sheet
August 2004
ISL6253
FN9117.2
Highly Integrated Battery Charger for
Notebook Computers
The ISL6253 is a highly integrated battery charger controller
for Li-Ion/Li-Polymer batteries. High Efficiency is achieved by
a synchronous buck topology and the use of a MOSFET,
instead of a diode, for selecting power from the adapter or
battery. The low side MOSFET emulates a diode at light
loads to improve the light load efficiency and prevent system
bus boosting.
The constant output voltage can be selected for 2, 3 or 4
series Li-Ion cells with 0.5% accuracy over temperature. It
can also be programmed between 4.2V +5% per cell and
4.2V -5% per cell to optimize battery capacity. When
supplying the load and battery charger simultaneously, the
input current limit for the AC adapter is programmable to
within 3% accuracy to avoid overloading the AC adapter,
and to allow the system to make efficient use of available
adapter power for charging. It also has programmable
charging current with 4% accuracy. The ISL6253 provides
outputs that are used to monitor the current drawn from the
AC adapter, and to monitor for the presence of an AC
adapter. The ISL6253 automatically transitions from
regulating current to regulating voltage. A conditioning
charge feature provides approximately 10% of full scale
charge current to safely charge deeply discharged lithium-
ion (LI+) battery packs when the battery voltage is below
3.0V/cell.
ISL6253 has a feature of automatic power source selection
by switching to the battery when the AC adapter is removed
or switching to the AC adapter when the AC adapter is
available. It also supports aircraft power applications while
powering the system and not charging the battery.
Ordering Information
PART #
TEMP.
RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6253HRZ
(Note 1)
-10 to 100 28 Ld 5x5 QFN
(Pb-free)
L28.5x5
ISL6253HAZ
(Note 1)
-10 to 100 28 Ld QSOP
(Pb-free)
M28.15
NOTES:
1. Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J Std-020B.
2. Add “-T” for Tape and Reel.
Features
• ±0.5% Voltage Accuracy
• ±3% Input Current Limit Accuracy
• ±4% Accurate Battery Charge Current Limit
• Programmable Charge Limit Current, Adaptor Current
Limit and Charge Voltage
• Fixed 300kHz PWM Synchronous Buck Controller with
Diode Emulation at Light Load
• Output for Current Drawn from the AC Adapter
• AC Adapter Present Indicator
• Fast Input Current Limit Response
• Input Voltage Range 7V to 25V
• Up to 17.6V Battery-Voltage Set Point
• Trickle Charge Mode When Battery Voltage is below
3.0V/Cell
• Supports 2, 3 and 4 Cell Battery Packs
• Control Adapter Power Source Select MOSFET
• Thermal Shutdown
• Aircraft Power Capable
• DC Adapter Present Indicator
• Battery Discharge MOSFET Control
• Less than 10µA Battery Leakage Current
• QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-free Available
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistants
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.






ISL6253 Datasheet, Funktion
ISL6253
Typical Operating Performance
Circuit of Figure 18, VDCIN = 20V, 4S2P Li-Ion Battery, TA = 25°C, unless otherwise noted.
0.1 0.01
VDCIN = 20V
0 VDD = 5.075V
EN = 0
0
-0.1
VDD =5.075V
IVDD = 0mA
-0.2 -0.01
-0.3
-0.4 -0.02
-0.5
-0.03
-0.6
-0.7
0
5 10 15 20 25
LOAD CURRENT (mA)
FIGURE 1. VDD LOAD REGULATION
30
-0.04
5
10 15 20
INPUT VOLTAGE VDCIN (V)
FIGURE 2. VDD LINE REGULATION
25
5.0 17.0
4.0 16.0
3.0 15.0
2.0 14.0
1.0 13.0
0.0 12.0
0 26 50 75 99
TIME (MINUTE)
FIGURE 3. BATTERY CHARGE V-I CHARACTERISTICS
INDUCTOR
CURRENT
1A/DIV
VDCIN
10V/DIV
BATTERY
VOLTAGE
10V/DIV
CHARGE
CURRENT
1A/DIV
t: 10ms/DIV
CHARGE CURRENT: 2.6A
INPUT VOLTAGE STEP: 18.0V TO 25V
LOAD CURRENT: 1A
FIGURE 5. LINE TRANSIENT RESPONSE
6
LOAD
CURRENT
5A/DIV
ADAPTER
CURRENT
5A/DIV
CHARGE
CURRENT
2A/DIV
BATTERY
VOLTAGE
2V/DIV
t: 1ms/DIV, CHLIM = ACLIM = VREF
LOAD STEP: 0A TO 4A
CHARGE CURRENT = 3A
AC ADAPTER CURRENT LIMIT = 5A
FIGURE 4. LOAD TRANSIENT RESPONSE
5
EN=0
0
-5
-10
-15
-20
0
1 23 4
AC ADAPTER CURRENT (A)
5
FIGURE 6. ICM ACCURACY vs AC ADAPTER CURRENT

6 Page









ISL6253 pdf, datenblatt
ISL6253
AC ADAPTER
VCC
R13
100K
1%
R14
10.5K
1%
R5, R14
100K
R8
130K
1%
Q5
VDD
C9
0.1µF CSON
Q3
R9
10.2K
1%
C8: 1µF
R7
C10: 1µF 4.7
DCIN
SSGGAATTEE
ACSET
DCSET
CCSSIPIP
VDDPISLIS6L2652353
CCSSININ
VDD
BBGGAATTEE
DIGITAL
INPUT
DIGITAL
INPUT
D/A OUTPUT
OUTPUT
A/D INPUT
HOST
R13: 100
C12
0.1µF
5A INPUT
CURRENT LIMIT
AVDD/VREF
R10,R11
R12:10k
SCL
SDL
A/D INPUT
GND
C7
6.8nF
R6 C6
10k 10nF
ACPRN
DCPRN
CHLIM
EN
ICM
ACLIM
BBOOOOTT
UGATE
PHASE
LGATE
PGND
CSOP
VREF
CSON
ICOMP
VCOMP
CELLS
GND
VADJ
C3
0.1µF
R2
20m
SYSTEM LOAD
R3: 18
VDDP
D2
C5
0.1µF
Q2
C1:10µF
Q1
Q4
D1 L
Optional 15µH
C2
10µF
C4 R4
1µF 2.2
3 CELLS
FLOAT
4.2V/CELL
R1
25m
C11
22µF
BAT+
BATTERY
PACK
SCL
SDL
TEMP
BAT-
FIGURE 18. ISL6253 CONTROLLED TYPICAL APPLICATION 2
12

12 Page





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