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ISL6293
Data Sheet October 5, 2004 FN9180.0
P R E L I M I N A RY
Li-ion/Li Polymer Battery Charger Accepting Two Power Sources
The ISL6293 is a fully integrated low-cost single-cell Li-ion or Li-polymer battery charger. The charger accepts two power inputs, normally one from a USB (Universal Serial Bus) port and another one from a desktop cradle. The ISL6293 is an ideal charger for smart handheld devices that need to communicate with a personal computer via USB. The ISL6293 features 28V and 7V maximum voltages for the cradle and the USB inputs respectively. The 28V rating allows low-cost adapters be safely used. When both inputs are powered, the cradle input is used to charge the battery. The charge current is independently programmable for both inputs with two small resistors. One additional USBP pin allows the selection of high-power or low-power port for the USB input. The charger is self-protected against over temperature. If the die temperature rises above 100C, a thermal foldback function reduces the charge current automatically to prevent further temperature rise. The charger preconditions the battery with low current when the battery voltage is below 2.6V. The charger has two indication pins. The PPR (power present) pin outputs an open-drain logic LOW when either the cradle or the USB input power is attached. The CHG (charge) pin is also an open-drain output that indicates a logic LOW when the charge current is above a minimum current level. When the charge current is below the minimum current, the charger remains in operation but the CHG pin indicates a logic HIGH signal. For simplicity, the charger does not have re-charge or timer functions.
Features
* Complete Charger for Single-Cell Li-ion/Polymer Batteries * Accept Two Power Sources * Low Component Count * Integrated Pass Element * Integrated Charge-Current Sensor with 10% Accuracy * No External Blocking Diode Required * Charge Current Thermal Foldback for Thermal Protection * 28V Maximum Voltage for the Cradle Input * Charge Indication * Adapter Presence Indication * Less than 1A Leakage Current off the Battery when No Input Power Attached * Ambient Temperature Range: -40C to 85C * Thermally-Enhanced 3x3 DFN Package * Pb-free Available
Applications
* Smart Handheld Devices * Cell Phones, PDAs, MP3 Players * Digital Still Cameras * Handheld Test Equipment
Ordering Information
PART # ISL6293-2CR ISL6293-2CRZ (Note) ISL6293-2CR-T ISL6293-2CRZ-T (Note) TEMP. RANGE (C) -40 to 85 -40 to 85 PACKAGE PKG. DWG. #
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"
10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 (Pb-free)
10 Ld 3x3 DFN Tape and Reel 10 Ld 3x3 DFN Tape and Reel (Pb-free)
Pinout
ISL6293-2 (DFN) TOP VIEW
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-020C.
CRDL USB PPR CHG EN
1 2 3 4 5
10 BAT 9 8 7 6 ICDL GND USBP IUSB
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.
ISL6293 Block Diagram
CRDL USB BAT
Temp Monitor CA + CPPR
ICDL IUSB USBP
+ VA Reference Current Control USB IR
VREF
CPPR
LBAT
CRDL BAT
ENA
PPR Control CHG
EN GND
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FN9180.0
ISL6293 Typical Applications
A Simple Charger Accepting Power from Both a USB Port and a Desktop Cradle
To Cradle Connector C1 To USB Connector To Battery CRDL BAT ICDL RICDL RIUSB R2 D1 R3 D2 C3
ISL6293-2
USB R1 C2
IUSB PPR CHG EN
500mA 100mA
USBP
GND
Disable Enable
COMPONENT SELECTION RICDL RIUSB R2, R3 C1, C2, C3 R1 D1, D2 1.82k for 0.8A cradle charge current 80k for 100mA/500mA USB charge current 350 1F ceramic capacitor 1 LEDs
A Simple Charger with Programmable Charge Current and Wide Input Voltage Range
BAT ICDL CRDL IUSB To Battery RICDL C2
USB To Cradle Connector C1
ISL6293-2
USBP PPR CHG EN GND
Disable Enable
COMPONENT SELECTION RICDL C1, C2 1.82k for 0.8A cradle charge current 1F ceramic capacitor
RIUSB is not required when the USB input of ISL6293-2 is left floating in the design for a single input charger.
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ISL6293
Absolute Maximum Ratings
Supply Voltage (USB) . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Supply Voltage (CRDL) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 28V Signal Input Voltage (EN, USBP, ICDL, IUSB, BAT) . . . . -0.3V to 7V Open-Drain Pull-Up Voltage (PPR, CHG) . . . . . . . . . . . . -0.3V to 7V
Thermal Information
Thermal Resistance JA (C/W) JC (C/W) 3x3 DFN Package (Notes 1, 2) . . . . . . 46 4 Maximum Junction Temperature (Plastic Package) . . . . . . . . 150C Maximum Storage Temperature Range . . . . . . . . . . . -65C to 150C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300C
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . .-40C to 85C Supply Voltage (USB Pin) . . . . . . . . . . . . . . . . . . . . . . 4.3V to 5.5V Supply Voltage (CRDL Pin) . . . . . . . . . . . . . . . . . . . . . . 4.3V to 24V Typical Cradle Charge Current . . . . . . . . . . . . . . . . . . 300mA to 1A Typical USB Charge Current . . . . . . . . . . . . . . . . 350mA to 450mA
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES: 1. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. See Tech Brief TB379. 2. For JC, the "case temp" location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER POWER-ON RESET Rising USB/CRDL Threshold Falling USB/CRDL Threshold VIN-BAT OFFSET VOLTAGE Rising Edge Falling Edge STANDBY CURRENT BAT Pin Sink Current CRDL Pin Supply Current USB Pin Supply Current CRDL/USB Pin Supply Current VOLTAGE REGULATION Output Voltage (Note 4) CRDL PMOS On Resistance USB PMOS On Resistance CHARGE CURRENT (Note 5) ICDL Pin Output Voltage IUSB Pin Output Voltage
Typical Values Are Tested at USB = CRDL = 5V and ambient temperature is at 25C, Unless Otherwise Noted. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Conditions. SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
3.4 3.2
3.7 3.5
4.0 3.8
V V
VOS VOS
VBAT = 4.0V, use CHG pin to indicate the comparator output (Note 3)
TBD
TBD TBD
TBD -
mV mV
ISTANDBY EN = HIGH or both inputs are floating ICRDL IUSB EN = LOW or floating EN = HIGH
-
150 150 0.55
1.0 250 -
A A A mA
VCH
Load = 0mA VBAT = 3.8V, ICHARGER = 0.5A VBAT = 3.8V, ICHARGER = 0.35A
4.158 -
4.2 700 700
4.242 -
V m m
VICDL VIUSB
VBAT = 3.8V
1.17 0.776 720 5.0 380 8.0 68
1.20 0.8 800 8.5 440 10.0 84
1.23 0.824 880 11.0 500 12.0 100
V V mA % mA % mA
CRDL Input Constant Charge Current CRDL Input Trickle Charge Current USB Input Constant Charge Current USB Input Trickle Charge Current (Note 4) USB Input Constant Charge Current
ICHARGE RICDL = 1.82k, VBAT = 3.8V, VCRDL = 5V Valid for -10C to 85C ITRICKLE RICDL = 1.82k, VBAT = 2.4V, VCRDL = 5V Given as a % of the CRDL ICHARGE
ICHARGE USBP = HIGH, RIUSB = 80k, VBAT = 3.8V ITRICKLE USBP = HIGH, RIUSB = 80k, VBAT = 2.4V Given as a % of the USB HIGH ICHARGE
ICHARGE USBP = LOW, RIUSB = 80k, VBAT = 3.8V
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Electrical Specifications
PARAMETER USB Input Trickle Charge Current END-OF-CHARGE CURRENT THRESHOLD Powered From USB Pin Powered From USB Pin Powered From CRDL Pin PRECONDITIONING CHARGE THRESHOLD Preconditioning Charge Threshold Voltage INTERNAL TEMPERATURE MONITORING Current Foldback Threshold (Note 6) LOGIC INPUT AND OUTPUT USBP Pin Logic Input High USBP Pin Logic Input Low USBP Pin Internal Pull Down Resistance EN Pin Logic Input High EN Pin Logic Input Low EN Pin Internal Pull Down Resistance CHG/PPR Sink Current NOTES: 3. The 4.0V VBAT is selected so that the CHG output can be used as the indication for the offset comparator output indication. If the VBAT is lower than the POR threshold, no output pin can be used for indication. 4. The maximum and minimum limits are guaranteed over -40C to 70C ambient temperature range. 5. The charge current may be reduced by the thermal foldback function, depending on the heatsinking condition of the test setup. 6. The threshold value at which the charger output is reduced to near zero. Guaranteed by design, not tested. Pin Voltage = 0.8V 2.0 1.2 15 1000 1000 0.4 0.4 V V k V V k mA TFOLD 85 100 115 C VMIN 2.5 2.6 2.7 V IEOC IEOC IEOC USBP = HIGH, USB = 5V, RIUSB = 80k Given as a % of the USB HIGH ICHARGE USBP = LOW, USB = 5V, RIUSB = 80k Given as a % of the USB LOW ICHARGE RICDL = 1.82k, VCRDL = 5V Given as a % of the CRDL ICHARGE 8.0 17.0 5.5 10.5 21.0 8.5 13.0 25.0 11.0 % % % Typical Values Are Tested at USB = CRDL = 5V and ambient temperature is at 25C, Unless Otherwise Noted. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Conditions. (Continued) SYMBOL ITRICKLE TEST CONDITIONS USBP = LOW, RIUSB = 80k, VBAT = 2.4V Given as a % of the USB LOW ICHARGE MIN 45.0 TYP 50.0 MAX 55.0 UNITS %
Functional Pin Description
CRDL (Pin 1)
Cradle input. This pin is usually connected to a cradle power input. The maximum input voltage is 28V. The charge current from this pin is programmable with the ICDL pin up to 1A. When this pin is connected to a power source, no charge current is drawn from the USB pin. A 1F or larger value ceramic capacitor is recommended for decoupling.
decoupling capacitor to prevent an over-shoot voltage when a USB cable is plugged in.
PPR (Pin 3)
Power presence indication. This is an open-drain output pin that outputs a logic LOW when either the USB input voltage or the CRDL input voltage is above its POR level, regardless if the charger is enabled or disabled. This pin provides a wake-up signal to a microprocessor when either the cradle or the USB power is connected.
USB (Pin 2)
USB input. This pin is usually connected to a USB port power connector. Other sources that are lower than 5.5V are also acceptable. The charge current from the USB pin is selectable between 100mA and 500mA maximum with the USBP pin when the RIUSB = 80k. A 1F or larger value ceramic capacitor is recommended for decoupling. It is also recommended to have a 1 resistor in series with the
CHG (Pin 4)
Charge indication pin. When the charge current from the cradle input during the constant current mode falls to below 8% of the programmed reference current by the ICDL pin or the charge current from the USB input is below 10% of the programmed charge current, the open-drain MOSFET is turned off. The pin will be pulled to logic HIGH by the pull-up resistor to indicate the End Of Charge.
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ISL6293
EN (Pin 5)
Enable logic input. Connect to LOW or leave floating to enable the charger. It is recommended that the charge current be programmed in the range of 300mA to 1A.
IUSB (Pin 6)
The IUSB pin programs the USB charge current. This pin is regulated to 0.8V. The current flowing out of this pin is mirrored to the USB charge current control reference. When the USBP pin is connected to logic HIGH, the typical USB charge current can be found as:
V REF 0.8V I USB = 45000 ----------------- = 45000 x ----------------- ( A ) R IUSB R IUSB
1280 1250 1220 RATIO 1190 1160 1130 1100 1070 1 2 3 RICDL (k) 4 5
The RIUSB has a programming range of 80k to 103k, such that the USB current has a typical value ranges from 350mA to 450mA. When the USBP pin is driven to logic LOW, the charge current is approximately 1/5 of the above value. USBP (Pin 7) USB port selection logic input. When this pin is left floating or driven to logic LOW, the USB port is regarded as a lowpower port, such that the charge current is 84mA. When this pin is driven to logic HIGH, the USB port is considered a high-power port, and the charge current is 450mA. The ratio of the charge current when this pin is HIGH or LOW is fixed at approximately 5:1.
FIGURE 1. THE RATIO USED IN THE CHARGE CURRENT CALCULATION vs RICDL
The second function of the ICDL pin is to monitor the actual charge current. The voltage of this pin, VICDL, is proportional to the actual charge current, ICHG, in either the USB or the cradle charger. When the cradle charger or the USB charger is working with USBP connected to logic HIGH, the ICDL pin voltage is given by the following equation.
R ICDL I CHG 1.20V V ICDL = --------------- I CHG = ----------------------------------I CDL ratio
GND (Pin 8)
System ground.
where the ratio has the same value given in Table 1. The cradle charge current should be programmed equal or higher than the USB current; otherwise, the ICDL pin voltage will be higher than 1.20V during the constant current mode when the USB charger is working. The charger still works properly but the accuracy of the current monitoring voltage degrades and saturates at approximately 2.1V. When the USB charger is working with the USBP pin connected to logic LOW, the ICDL pin voltage is approximately five times of the above equation.
ICDL (Pin 9)
The ICDL pin has two functions. The first function is to program the cradle charge current during the constantcurrent mode. The voltage of this pin is 1.20V during the constant-current mode of the cradle charger. The constantcurrent mode current is programmed by the following equation:
1.20V I CDL = ---------------- ratio R ICDL (A)
BAT (Pin 10)
Charger output pin. Connect this pin to the battery pack or the battery cell. A 1F or larger value ceramic capacitor is recommended for decoupling. The charger relies on the battery for stability so a battery should always be connected to the BAT pin.
where RICDL is the resistor connected to the ICDL pin (see the Typical Application). The ratio is given by the following table and curve.
TABLE 1. RATIO vs RICDL RICDL (k) Ratio 1.5 1291 2.2 1216 3.0 1155 3.9 1122 4.6 1088
Description
The ISL6293 is designed for a single-cell Li-ion or Li-polymer battery charging circuit that accepts both a USB port and a desktop cradle as its power source. The charge current from each power source is independently programmable but only one of the two sources charges the battery. The following describes the operation of the charger.
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FN9180.0
ISL6293
Input Auto Selection
The charger selects only one power source to charge the battery. When the CRDL input is higher than both the POR threshold and the battery voltage, CRDL is the power source. When this condition is not true, then the USB input is selected as the power source. If the CRDL input happens to have a voltage below the battery voltage but the USB input has a voltage higher than the battery voltage, then the USB input is used to charge the battery. The control circuit always breaks both internal power devices before switching in one power source to avoid any simultaneous conduction of both power MOSFETs. When the BAT pin voltage is below 1.7V, the charger selects the CRDL input as the power source. Hence, if the USB input is powered, the charger will not charge the battery.
Floating Charge Voltage
The floating voltage during the constant voltage mode is 4.2V. The floating voltage has 1% accuracy over the ambient temperature range of -40C to 70C. No leakage current from any of the two power MOSFETs will cause the battery voltage to drift to a higher level.
Trickle Charge Current
When the battery voltage is below the minimum battery voltage VMIN given in the electrical specification, the charger operates in a trickle/preconditioning mode. If power comes from the cradle, the trickle mode current is
1.20V I TRICKLE = ---------------- 100 R ICDL (A)
USB Charge Current
When the USB port is the power source, the charge current is programmed by the logic input USBP pin. When the USBP is driven to logic LOW, the charge current is set to 90mA (when RIUSB is 80k). When the USBP is driven to logic HIGH, the charge current is set to 450mA (when RIUSB is 80k). The USBP is equivalent to a logic LOW when left floating. Typically the P-channel MOSFET for the USB input has an rDS(ON) of 700m at room temperature. With a 500mA charge current, the typical head room is 350mV. If the input voltage drops to a level that the voltage different between the USB pin and the BAT pin is less than 350mV, the rDS(ON) becomes a limiting factor of the charge current; and the charge current will reduce to a lower level in this case.
The trickle current is 45mA if the power comes from the USB port with RIUSB = 80k.
End-of-Charge Indication
The CHG pin outputs a logic HIGH by turning off the internal open-drain MOSFET when the charge current falls below 8% of the constant current mode current for the cradle charger or 10% for the USB charger. The charger, however, does not turn off as long as an input power source is attached.
Power Presence Indication
When either the USB or the cradle input voltage is above the POR level, the PPR pin outputs a logic LOW signal to indicate the presence of input power.
Cradle Charge Current
The cradle charge current is programmed with the external resistor connected between the ICDL pin and the GND pin. The current can be calculated with the equation given in the ICDL pin description. The typical P-channel MOSFET for the CRDL input is 700m at room temperature. The actual charge current will be limited by several factors, for example, the programmed ICDL, the thermal limit, and the rDS(ON).
ISL6293 Dual Flat No-Lead Plastic Package (DFN)
2X A D 0.15 C A 2X 0.15 C B
L10.3x3
10 LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE MILLIMETERS SYMBOL A A1 MIN 0.80 NOMINAL 0.90 0.20 REF 0.18 0.23 3.00 BSC 1.95 2.00 3.00 BSC 1.55 1.60 0.50 BSC 0.25 0.30 0.35 10 5 0.40 1.65 2.05 0.28 MAX 1.00 0.05 NOTES 5,8 7,8 7,8 8 2 3 Rev. 3 6/04 NOTES: 1. Dimensioning and tolerancing conform to ASME Y14.5-1994. 2. N is the number of terminals. 3. Nd refers to the number of terminals on D. 4. All dimensions are in millimeters. Angles are in degrees. 5. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 identifier may be either a mold or mark feature. 7. Dimensions D2 and E2 are for the exposed pads which provide improved electrical and thermal performance. 8. Nominal dimensions are provided to assist with PCB Land Pattern Design efforts, see Intersil Technical Brief TB389.
C L
6 INDEX AREA TOP VIEW
E
A3 b D
B
D2 E E2
0.10 C
e k L
A C SEATING PLANE SIDE VIEW
0.08 C
A3
N Nd
7 (DATUM B) 6 INDEX AREA (DATUM A) 1 2 D2
8
D2/2 NX k E2 E2/2
NX L N 8 N-1 e (Nd-1)Xe REF. BOTTOM VIEW 0.415 NX (b) 5 SECTION "C-C" C NX b (A1) 0.200 NX L NX b 5 0.10 M C A B
L e CC TERMINAL TIP
FOR ODD TERMINAL/SIDE
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 8
FN9180.0

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