an1457

ISL6294AEVAL1Z Evaluation Board
Application Manual
®
Application Note
May 5, 2009
AN1457.0
Description
Features
The ISL6294AEVAL1Z is an evaluation tool for the
ISL6294A single-cell Li-ion battery charger. The evaluation
tool provides a complete evaluation platform addressing all
data sheet specifications and functionality. The jumpers on
the board facilitate the programming of the charge current,
different charging conditions, and can be used to make other
necessary connections, such as current measurement.
• A Complete Evaluation Platform for the ISL6294A Charger
The ISL6294A is a fully integrated single-cell Li-ion battery
charger. The ISL6294A accepts input voltages ranging from
4.5V up to 28V. Due to the high voltage capability, the
components associated with the cradle input circuit on the
evaluation board are good for a 28V supply.
• Convenient Jumpers for Programming the Charge
Current, Charge Mode, and for Current Measurement
The components assembled in the center square constitute
a complete charger, indicating the space saving advantage
of the typical ISL6294A installation in space-limited
applications.
ISL6294AEVAL1Z
• Cradle Input Accepts Voltage up to 28V
• Flexible Power Connectors Each with a Hook and a
Solder Pad Providing Variety to Users
• 3.5x2.5 Square Inches Board Size Handy for Evaluation
• Thermal Vias in the Thermal Pad Similar To Customers’
Thermally Enhanced Environment
• On-Board LEDs for Input PPR and CHG State Indication
What is Needed
The following instruments will be needed to perform testing:
Ordering Information
PART NUMBER
• The Center Square Suggesting the Space Saving
Advantage of the Typical Components Assembly
DESCRIPTION
Evaluation Board for ISL6294A
• Power supplies:
1) PS1: DC 30V/2A
2) PS2: DC 10V/2A
3) PS3: DC 10V/2A
• DC Electronic load: 20V/2A
• Multimeters
Pinout
• Function generator
ISL6294A
(8 LD DFN)
TOP VIEW
• Oscilloscope
• Cables and wires
VIN
1
8 BAT
PPR
2
7 IREF
CHG
3
6 IMIN
EN
4
5 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1457
FIGURE 1. CONNECTION OF TEST INSTRUMENTS
Quick Setup Guide (Refer to Figure 1)
DO NOT APPLY POWER UNTIL STEP 5
For Cradle Input
Step 1:
Connect a 5V supply PS1 to CRDL input (J1,
upper +) with the current limit set at 1.3A
Step 2:
Connect a 3.7V supply PS3 to BAT output (J2,
upper +) with the current limit set at 1.3A
Step 3:
Connect a current meter to JP6, as shown in
Figure 1
Step 4:
Connect the DC electronic load of 1.2A to BAT
(J2, upper +)
Step 5:
Insert a jumper shunt on JP2, JP3, JP4 and JP5,
all other jumpershunts are not installed
Step 6:
Turn on Power Supplies and DC electronic load;
adjust the power supply PS3 such that the
voltmeter V2 reads 3.7V
Step 7:
Both the red and the green LEDs should be on,
indicating power on and charging condition
Step 8:
The current meter I2 should read about 0.6A as
the charging current
2
Step 9:
Insert a jumper shunt on JP7 and the current
meter I2 should read about 1.2A charging
current
Step 10:
Remove the jumper shunt on JP3 and apply a
3.3V supply, positive to Pin 1 (at the right) of
JP3, negative to GND
Step 11:
Slowly reduce the DC electronic load current
until the green LED turns off; the current meter
I2 should read about 50mA EOC current
AN1457.0
May 5, 2009
Application Note 1457
Description of Jumper Settings
JP1 - Connects the EN pin to a pull-up voltage or GND. The
pull-up voltage is either the BAT voltage (when a shunt is
installed on JP3) or an external 3.3V power source (when
the shunt on JP3 is removed and a +3.3V supply is
connected to pin 1(at the right) of JP3). If there is no shunt
installed on JP1, the EN pin is internally pulled down to logic
LOW, which enables the charger. If a shunt is installed
across the two jumper pins labeled as “Enable”, the EN pin
is driven to logic LOW and the charger is enabled, same as
floating. If the shunt is installed across the two jumper pins
labeled as “Disable” and the pull-up voltage is above 2V, the
EN pin is driven to logic HIGH, which disables the charger.
JP4 - Connect a 243k resistor from IMIN pin to GND for
50mA EOC current.
JP5 - Connect a 20k resistor from IREF to GND for 0.6A
charge current.
JP6 - A shunt installed on JP6 connects the BAT pin to the
output connector J2 if output current measurement is not
needed. The shunt can be replaced by a current meter if
output current measurement is needed as shown in Figure 1.
JP7 - Parallels an additional 20k resistor to the IREF pin
(total RICDL = 10k), the charge current will be increased to
1.2A.
TABLE 1. JUMPER SETTING SUMMARY
JP2 - A shunt installed on JP2 connects the input source from
connector J1 to the circuit if input current measurement is not
needed. The shunt can be replaced by a current meter if input
current measurement is needed, as shown in Figure 1.
JP3 - Selects the power source for logic pull-up and the LED
supply. If a shunt is installed, the BAT voltage is selected as
the power source. If the shunt is removed, an external power
supply of +3.3V can be connected from Pin 1 (at the right) to
GND to provide the pull-up and LED supply power. The
purpose is to exclude the extra current through the charger
when characterizing small currents, such as EOC and
quiescent currents.
JUMPER
JP1
FUNCTION
Shunt on Disable
Charger disabled
Shunt on Enable
Charger enabled
Shunt not installed Charger enabled
Shunt installed
Connects input source at J1 to VIN
pin
JP3
Shunt installed
Select BAT as the pull-up source
JP4
Shunt installed
Sets EOC current to 50mA
Shunt installed
Sets charging current to 0.6A, if
shunt on JP7 is not installed
Shunt installed
Connects BAT to J2
Shunt installed
Sets charging current to 1.2A, if
shunt on JP5 is also installed
JP2
JP5
JP6
JP7
3
POSITION
AN1457.0
May 5, 2009
Application Note 1457
Board Design
Schematic
FIGURE 2. SCHEMATIC
4
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Application Note 1457
TABLE 2. ISL6294AEVAL1Z BILL OF MATERIALS
ITEM
QTY
REFERENCE
PART DESCRIPTION
1
1
U1
2
2
R1, R2
470Ω, 5%, 1/8W Resistor
5
1
R5
6
2
R6, R7
7
1
8
ISL6294A Charger
PCB
FOOTPRINT
2x3 DFN
PART NUMBER
VENDOR
ISL6294A
Intersil
0805
ERJ-6GEYJ471V
Panasonic
243k, 1%, 1/8W Resistor
0805
ERJ-6ENF2433V
Panasonic
20k, 1% 1/8W Resistor
0805
ERJ-6ENF2002V
Panasonic
C1
4.7µF, 35V, Tantalum
6032
ECS-T1VC475R
Panasonic
1
C2
0.1µF, 50V, X7R Ceramic
0603
C1608X7R1H104K
TDK
9
1
C3
10µF, 6.3V, Tantalum
0603
ECS-T0JY106R
Panasonic
10
2
C4, C8
1.0µF, 6.3V, X5R Ceramic
0603
ECJ-1VB0J105K
Panasonic
11
1
C6
47µF, 6.3V, X5R Ceramic
1210
ECJ-4YB0J476M
Panasonic
12
2
J1, J2
2.54mm Center Header, 2 CKT
22-11-2022
Molex
13
2
CRDL, VBAT
Test point, Red
5010
Keystone
14
5
5014
Keystone
15
4
GND1, GND2, GND3,
GND4
Test point, Black
5011
Keystone
16
6
JP2, JP3, JP4, JP5, JP6,
JP7
2.54mm header, 2ckt
22-28-4020
Molex
17
1
JP1
2.54mm header, 3ckt
22-28-4030
Molex
18
1
D1
Green LED
0805
SML-LXT0805GW-TR
Lumex Opto
19
1
D2
Red LED
0805
SML-LXT0805IW-TR
Lumex Opto
EN, CHG, PPR, IMIN, ICDL Test point, Yellow
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 the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
5
AN1457.0
May 5, 2009
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