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ISL6291-2CR の電気的特性と機能

ISL6291-2CRのメーカーはIntersil Corporationです、この部品の機能は「Li-ion/Li Polymer Linear Battery Charger」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL6291-2CR
部品説明 Li-ion/Li Polymer Linear Battery Charger
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL6291-2CR Datasheet, ISL6291-2CR PDF,ピン配置, 機能
®
Data Sheet
November 2003
ISL6291
FN9102.1
Li-ion/Li Polymer Linear Battery Charger
The ISL6291 provides a low-cost integrated charger solution
for single-cell Li-ion and Li Polymer rechargeable batteries.
No external pass element, current sensing resistor, or
reverse blocking diode is required with this solution.
The ISL6291 is a constant-current (CC)/constant-voltage
(CV) charger. The constant charge current is programmable
up to 2.0A with an external signal resistor. An internal
trimmed current-sense circuit guarantees 10% accuracy,
with no bulky external current-sense resistor. The constant
voltage is either 4.1V or 4.2V. The charger always
preconditions the battery with 1/10 of the programmed
charge current at the beginning of a charge cycle, until it
verifies that the battery can be fast-charged. A safety timer
prevents over-charging a dead battery. The charging
terminates as the charge current falls below the
programmed minimum current during the CV mode. The
charger automatically re-charges the battery when the
battery voltage drops below a recharge threshold. A simple
interface with an NTC thermistor avoids charging the battery
outside a programmable temperature window. A thermal-
foldback feature of the ISL6291 guarantees safe operation
when the printed circuit board space is limited for thermal
dissipation. The charger reduces the charge current
automatically, as the internal temperature rises above a
preset level, to prevent further temperature rise.
When the wall adapter is not present, the ISL6291 draws
less than 1µA current from the battery. Two logic outputs
provide the charging status and fault information, and an
easy interface to system logic. A V2P8 pin outputs a 2.8V
reference voltage that can be used to bias other circuits, or
as an indication for the adapter presence.
The ISL6291 is packed in a thermally enhanced 5x5 QFN
package. See the Technical Brief TB389 given in the
Related Literature for more information related to the
package.
Ordering Information
TEMP. RANGE
PART NUMBER (oC) PACKAGE
PKG.
DWG. #
ISL6291-1CR
-20 to 70 16 Ld 5x5 QFN L16.5x5B
ISL6291-1CR-T 16 Ld 5x5 QFN Tape and Reel
ISL6291-2CR
-20 to 70 16 Ld 5x5 QFN L16.5x5B
ISL6291-2CR-T 16 Ld 5x5 QFN Tape and Reel
ISL6291EVAL1 Evaluation Board
Features
• Integrated Linear Pass Element
• Integrated Charge Current Sensor
• No External Reverse Blocking Diode Required
• 1% Voltage Accuracy
• Programmable Current Limit Up to 2.0A
• Programmable End-of-Charge Current
• Trickle Charge an Over Discharged Battery
• Charge Current Thermal Foldback
• Simple Interface for Low-Cost Thermistor
• Accepts USB Bus Power
• Ambient Temperature Range: -20oC to 70oC
• Thermally-Enhanced 5x5 QFN Package (θJA = 33oC/W)
Applications
• Handheld Devices
• Cell Phones
• PDAs
• 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 TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
Pinout
ISL6291 (QFN)
TOP VIEW
16 15 14 13
VIN 1
FAULT 2
STATUS 3
12 VBAT
11 TEMP
10 IMIN
TIME 4
9 IREF
5678
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. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

1 Page





ISL6291-2CR pdf, ピン配列
Typical Application
ISL6291
5V W all
Adapter
C1
1µF
5k
5 k
VIN
TOEN
VBAT
ISL6291
0.1µF
FAULT
STATUS
EN
V2P8
TIME
TEMP
IREF
IMIN
GND
15nF CTIME
10µF
C2 V2P8
T
RIMIN
80k
RIREF
80 k
Battery
Pack
3


3Pages


ISL6291-2CR 電子部品, 半導体
ISL6291
Description
Initialization
The ISL6291 initializes as the input voltage rises above the
power-on-reset (POR) threshold. Once the input voltage
reaches the POR level, the V2P8 pin outputs a 2.8V voltage.
This output voltage can be used as an adapter presence
indication and to bias the thermistor circuit. The POR takes
about 200µs. During the POR, the STATUS pin outputs a
logic HIGH signal, and the FAULT pin outputs a logic LOW
signal.
Operation States
Immediately after the POR, the charger enters a charge
state. A charge state always cycles through a trickle mode, a
constant-current mode, and a constant voltage mode, as
shown in Figure 1. If the battery completes a charge cycle
without a fault, the operation moves to the inhibit state,
waiting for the battery to be discharged to start another
charge cycle. Two types of fault may occur during a charge
cycle, namely, a TIMEOUT fault or a temperature fault (refer
to Functional Pin Description on TIME, TOEN, and TEMP
pins). If a fault occurs during the charge modes, the
operation enters the fault state. The charger is in a standby
state when the adapter is removed, or the EN pin of the IC is
pulled to LOW. In the standby state, the charger IC draws
less than 1µA current from the battery. The two open-drain
pins, STATUS and FAULT, indicate the operation states of
the charger (see Table 1).
TABLE 1. STATUS INDICATIONS
FAULT STATUS
INDICATION
HIGH HIGH
Charge completed with no fault (Inhibit) or
Standby
HIGH LOW
Charging in one of the three modes
LOW HIGH Fault
*Both outputs are pulled up with external resistors.
The charger starts a new charge cycle when a wall adapter
is plugged in, a new battery is inserted, a battery voltage
drops below the re-charge threshold, a temperature fault
ends, or the EN pin is toggled from LOW to HIGH.
Trickle Charge Mode
A charge cycle always starts with the trickle charge mode.
The trickle charge mode is to pre-condition the battery and
prepare it for the fast charge (constant current or constant
voltage charge). It is not recommended to fast charge a
Li-ion battery when the battery is deeply discharged,
indicated by a low battery voltage. When the ISL6291 sees a
battery voltage lower than the VMIN given in the Electrical
Specifications, it forces 1/10 of the current in the constant
current mode into the battery. The charger stays in the trickle
mode until the battery voltage is above VMIN for 15
consecutive oscillation cycles (TOSC). The 15-cycle delay is
to avoid entering the constant current mode accidentally,
caused by any transient voltage spike on the battery pack
terminals. The charge time for the trickle mode is limited to
1/8 of the TIMEOUT interval (see TIME pin description and
Figure 1). If the trickle charge time takes longer than 1/8 of
the TIMEOUT interval, a TIMEOUT fault is issued and the
charger is latched. The minimum trickle charge time is 15
TOSC, and the maximum time is 1/8 TIMEOUT. During the
trickle mode, the STATUS pin is set to logic LOW, and the
FAULT pin is set to logic HIGH.
Constant Current Charge Mode
The battery is charged with a constant current programmed
by the IREF pin resistor (see IREF pin description) during
the constant current mode. The constant current is trimmed
to 10% accuracy. The battery voltage rises towards the
charge termination voltage VCH in this mode. The constant
current mode ends when the battery voltage reaches VCH.
The internal clock counter limits the maximum time for the
constant current mode to the TIMEOUT interval. The counter
is reset at the beginning of the this charge mode. If the
VCH
VRECHRG
VMIN
IREF
Trickle time
< 1/8 TIMEOUT
TIMEOUT
0
Trickle
Mode
Constant Current
Mode
Constant Voltage
Mode
TIME
IREF/10
IMIN
0
Inhibit
Trickle
Mode
CC
Mode
CV
Mode
FIGURE 1. MODES OF OPERATION
6

6 Page



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部品番号部品説明メーカ
ISL6291-2CR

Li-ion/Li Polymer Linear Battery Charger

Intersil Corporation
Intersil Corporation
ISL6291-2CR-T

Li-ion/Li Polymer Linear Battery Charger

Intersil Corporation
Intersil Corporation


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