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PDF ISL6292D Data sheet ( Hoja de datos )
| Número de pieza | ISL6292D | |
| Descripción | Li-ion/Li Polymer Battery Charger | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISL6292D (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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NOc1DNTo-a8nORt8taaE8Rc-CSEItNOhCoTeMOuEerMMRtTMESeNIcELhDNonEDriDcEwaDFlwOSRwRuE.ipPnNpLtEeoArWrsCt iCElD.ceMEonSEmtIeNG/rTtNsacSt July 2004
ISL6292D
FN9166
Li-ion/Li Polymer Battery Charger
The ISL6292D is an integrated single-cell Li-ion or
Li-polymer battery charger capable of operating with an input
voltage as low as 2.4V. This charger is designed to work with
various types of ac adapters or a USB port.
The ISL6292D operates as a linear charger when the ac
adapter is a voltage source. The battery is charged in a
CC/CV (constant current/constant voltage) profile. The
charge current is programmable up to 2A. The ISL6292D
can also work with a current-limited adapter to minimize the
thermal dissipation, in which case the ISL6292D combines
the benefits of both a linear charger and a pulse charger.
The ISL6292D features charge current thermal foldback to
guarantee safe operation when the printed circuit board is
space limited for thermal dissipation. Additional features
include preconditioning of an over-discharged battery, an
NTC thermistor interface for charging the battery in a safe
temperature range, automatic recharge, and thermally
enhanced QFN package.
Ordering Information
PART #
TEMP.
RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6292DCR4
-20 to 70 16 Ld 4x4 QFN
L16.4x4
ISL6292DCR4-T 16 Ld 4x4 QFN Tape and Reel
ISL6292DCRZ
(Note)
-20 to 70 16 Ld 4x4 QFN (Pb-free) L16.4x4
ISL6292DCRZ-T 16 Ld 4x4 QFN Tape and Reel (Pb-free)
(Note)
NOTE: 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.
Pinout
ISL6292D (16 LEAD QFN)
TOP VIEW
16 15 14 13
VIN 1
12 VBAT
STAT2 2
STAT1 3
11 TEMP
10 IMIN
TIME 4
9 IREF
5678
Features
• Complete Charger for Single-Cell Li-ion Batteries
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• Very Low Thermal Dissipation
• Two-Speed Blinking Indication at Fault Conditions
• 1% Voltage Accuracy
• Programmable Current Limit up to 2A
• Programmable End-of-Charge Current
• Charge Current Thermal Foldback
• NTC Thermistor Interface for Battery Temperature Monitor
• Accepts Multiple Types of Adapters or USB BUS
Power
• Guaranteed to Operate at 2.65V After Start Up
• Ambient Temperature Range: -20°C to 70°C
• Thermally-Enhanced QFN Packages
• 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
• Handheld Devices including Medical Handhelds
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Self-Charging Battery Packs
• Stand-Alone Chargers
• USB Bus-Powered Chargers
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB379 “Thermal Characterization of
Packaged Semiconductor Devices”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
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.
1 page  
Block Diagram
ISL6292D
VIN
C1
IREF
RIREF
IMIN
RIMIN
TEMP
TOEN
TIME
GND
QMAIN
VBAT
Temperature
Monitoring
IT
IR
Current
References
IMIN
QSEN
100000:1
Current
Mirror
ISEN
References
Input_OK
+
VIN VBAT
+
C- A
CHRG
- VPOR
++
- 100mV
+
VA-
VCH
ISEN
V2P8
Trickle/Fast
+
- MIN_I
+
Minbat
-
VMIN
VRECHRG
+
Recharge -
VIN
NTC
Interface
Under Temp
Over Temp
Batt Removal
LOGIC
VIN
V2P8
STAT1
STAT2
OSC
COUNTER
Input_OK
EN
FIGURE 1. BLOCK PROGRAM
5
5 Page 
ISL6292D
As the TEMP pin voltage rises from low and exceeds the
1.5V threshold (when the V2P8 pin is forced with a 3V bias),
the under temperature signal rises and does not clear until
the TEMP pin voltage falls below the 1.286V falling
threshold. Similarly, the over-temperature signal is given
when the TEMP pin voltage falls below the 0.605V threshold
and does not clear until the voltage rises above 0.66V. The
actual accuracy of the 3V bias is not important because all
the thresholds and the TEMP pin voltage are ratios
determined by the resistor dividers, as shown in Figure 7.
The NTC thermistor is required to have a resistance ratio of
3.96:1 at the low and the high temperature limits, that is,
R--R---C--H--O--O---L--T-D-- = 3.96
(EQ. 7)
This is because at the low temperature limit, the TEMP pin
voltage is 1.5V, which is 1/2 of the 3V bias. Thus,
RCOLD = RU
(EQ. 8)
where RU is the pull-up resistor as shown in Figure 7. On the
other hand, at the high temperature limit the TEMP pin
voltage is 0.605V, 20.17% of the 3V bias. Therefore,
R-----RH----UO-----T- = 1-----0–----.-02---.0--2--1-0--7--1---7--
(EQ. 9)
For applications that do not need to monitor the battery
temperature, the NTC thermistor can be replaced with a
regular resistor of a half value of the pull up resistor RU.
Another option is to connect the TEMP pin to the IREF pin
that has a 0.8V output. With such connection, the IREF pin
can no longer be programmed with logic inputs.
Battery Removal Detection
The ISL6292D assumes that the thermistor is co-packed
with the battery and is removed together with the battery.
3.4V
2.8V
VIN
V2P8
2.4V
FIGURE 8. THE V2P8 PIN OUTPUT vs THE INPUT VOLTAGE
AT THE VIN PIN. VERTICAL: 1V/DIV,
HORIZONTAL: 100ms/DIV
STAT1
STAT2
STATUS
Temp
Fault
TIMEOUT
Fault
CTIME
OSC
TIME
DFF1
DFF8 DFF9
(A)
TIME
OSC
Output
DFF1
Output
DFF8
Output
DFF9
Output
(B)
FIGURE 9. EQUIVALENT CIRCUIT FOR THE STAT1/STAT2
INDICATION PINS AND KEY OPERATING
WAVEFORMS
When the charger senses a TEMP pin voltage that is 2.1V or
higher, it assumes that the battery is removed. The battery
removal detection circuit is also shown in Figure 7. When a
battery is removed, the charger is stopped. When a battery
is inserted again, a new charge cycle starts.
Indications
The ISL6292D has three indication pins: V2P8, STAT1, and
STAT2. The input presence is indicated by the V2P8 pin.
Figure 8 shows the V2P8 pin voltage vs. the input voltage.
The equivalent circuit for the STAT1 and STAT2 pins are
shown in Figure 9. Both pins have ESD diodes to clamp the
pin voltage between ground and the input, as shown in the
Block Diagram. The STATUS block outputs a logic HIGH
when the charger is charging and a LOW whenever the
charger is not charging. When a fault case happens, the
charger stops charging, therefore, the STATUS block outputs
LOW. Depending on fault cause, either the eighth or the
ninth D-type flip-flop output is gated to the STAT1 pin. Both
flip-flop outputs are 50% duty ratio blinking signals. The
periods of the eighth and ninth flip-flop output are calculated
by the following equations:
T8th = 28 TOSC = 256 TOSC
(EQ. 10)
T9th = 29 TOSC = 512 TOSC
(EQ. 11)
Table 1 and 2 summarize the LED indication driven by
STAT1 and STAT2 respectively.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ISL6292D.PDF ] | |
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