Data Sheets - Skyworks Solutions, Inc.

EVALUATION BOARD DATA SHEET
EV144
Evaluation Board for the AAT4621
PC Card Current Limit Interface and Capacitor Charger
General Description
The AAT4621EV evaluation kit is a fully assembled and tested circuit board designed to demonstrate the features of the
AAT4621 SmartSwitch™ supercapacitor charger. The board accepts a 3V to 5.5V supply and provides the power control
loop, reverse blocking and temperature foldback required to charge high capacitance supercapacitors for applications
such as PC cards and other portable high current requirements. Numerous test points are available to connect input/
output control signals for system integration and to ease measurements of key parameters. Jumpers are included to
enable/disable the device or to connect to a logic level for on/off control.
The AAT4621 uses very few external components. The current limit is set by two external resistors allowing a ±10%
current limit accuracy over the normal operating temperature range. The switch can be controlled from either of the
two enable inputs and in the off condition will block currents in both directions. The AAT4621 also incorporates a System
READY (RDY) function which can advise the system that the super capacitor is fully charged and ready for use.
Adjustable hysteresis is provided with the addition of an external resistor.
The AAT4621EV kit is shipped with the AAT4621IWO and a 550mF CAPXX supercapacitor installed and the device is
programmed to the high charge current limit level.
Features
•
•
•
•
•
•
VIN Range: 3.0V to 5.5V
Dual Independent Current Limits
75mA to 1200mA
Reverse Current Blocking Protection
Power Loop with Temp Foldback
50mΩ Typical RDS(ON) at 3V
Figure 1: Fully Assembled AAT4621EV Evaluation Kit.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202271A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 16, 2012
1
EVALUATION BOARD DATA SHEET
EV144
Evaluation Board for the AAT4621
PC Card Current Limit Interface and Capacitor Charger
PCB Layout
Figure 2: Top Assembly Layer.
Figure 3: Bottom Assembly Layer.
J1
VCC
EN IU
J2
VCC
14
EN IL
EN IL
VCC
P2
VCC
P4
GND
TB1
IN
VCC
EN IU
C1
10µF
13
R1
1.5K
D1
U1
EN IU
RDY
RDY
1
2
RHYS
EN IL
RHYS
12
GND
ISETU
3
ISETU
11
VCC
ISETL
4
ISETL
VCC
OUT
5
VCC
OUT
VCC
OUT
10
9
8
P1
RDY
LED RED
AAT 4621_TDFN 33-14
6
R2
200K
R3
1M
R4
120K
P3
OUT
7
R5
47.5K
+
C2
10µF
+
SC1
0.55F
R6
47.5K
OUT
TB 2
OUT
P5
GND
Figure 4: AAT4621EV Kit Schematic.
2
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202271A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 16, 2012
EVALUATION BOARD DATA SHEET
EV144
Evaluation Board for the AAT4621
PC Card Current Limit Interface and Capacitor Charger
Quick Start Guide
Recommended Equipment
•
•
•
•
•
•
Variable power supply: 0V to 5V @ 2A
DVM voltmeter
DVM ammeter
Load resistors or electronic load up to 1.2A
Current probes
4-channel oscilloscope
Quick Start Operating Procedure
The following procedure should be used when operating the AAT4621EV for the first time to verify correct operation.
Use Figure 5 as a guide.
1.
2.
3.
4.
5.
6.
7.
8.
Preset the power supply to 3.7V.
Turn off the power supply. Do not turn the power supply on until all connections have been made.
Connect the power supply positive lead to the positive connector on a DVM set as a ammeter.
Connect the negative connector on the ammeter to the VCC pin connector of the AAT4621EV.
Connect the power supply negative lead to the GND pin connector near the VCC pin connector on the AAT4621EV.
Make sure J1 and J2 are connected to Pins 1 to 2 initially to disable the AAT4621.
Turn on the power supply.
Remove the jumper on J1 and J2 and set to Pins 2 and 3; verify that the VOUT voltage level is 3.7V using the
voltmeter.
9. Reinstall J1 and check enable/disable function, no load and shutdown current.
Figure 5: Measurement Setup to Verify Correct AAT4621EV Operation.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202271A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 16, 2012
3
EVALUATION BOARD DATA SHEET
EV144
Evaluation Board for the AAT4621
PC Card Current Limit Interface and Capacitor Charger
Detailed Description
Detailed Operating Procedure
The following procedures are provided as optional steps that can be used to test the AAT4621 device functions using
the AAT4621EV evaluation kit. Use Figure 6 as a guide.
Check Ramp Rate and Charge Current
Connect a 3.7V supply to the VCC pin and an electronic load set to CC mode on VOUT. Connect voltage probes to VCC,
VOUT, and RDY. Connect a current probe on the input wire. Measure rise time on the supercapacitor and the input
charge current value. Monitor the RDY pin, which goes low when the SC is fully charged. See Figure 7 for the 800mA
charge current example. Set the ISETU to Pins 1 and 2 to lower the charge current to 96mA and see Figure 8.
Check Startup with Pulsed Load
Remove the RDY voltage probe and connect a current probe to the output load wire. Set the CC load to a transient
current pulse and measure VOUT voltage droop as shown in Figures 9 and 10.
Check GSM Performance
Set the CC load to transient and set the current to 1.1A for 1.1ms and then 0A for 4.612ms to simulate a GPRS
Transmit, 2-slot signal as shown in Figure 9. Current draw from supercapacitor = 1.1A for 1.154ms every 4.615ms. 2
slots/frame = 2X 577ms or 1.154ms / 4.615ms = 25% duty cycle. This represents a power amplifier power consumption = +33dBm (50% efficiency) = 2W / 50% = 4W and current during transmit is 4W / 3.75V = 1.1A, Average current: 1.1A x 25% = 275mA.
Figure 6: Measurement Setup to Verify Detailed AAT4621EV Operation.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202271A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 16, 2012
EVALUATION BOARD DATA SHEET
EV144
Evaluation Board for the AAT4621
PC Card Current Limit Interface and Capacitor Charger
Channel 4:
VCC (1V/div)
Channel 4:
VCC (1V/div)
Channel 3:
VOUT (1V/div)
Channel 3:
VOUT (1V/div)
Channel 1:
RDY (1V/div)
Channel 1:
RDY (1V/div)
Channel 2:
IIN (500mA/div)
Channel 2:
IIN (500mA/div)
Time (500µs/div)
Figure 7: Startup Waveform No Load, 800mA Current Limit.
Figure 8: Startup Waveform No Load, 96mA Current Limit.
Channel 4:
VCC (1V/div)
Channel 3:
VOUT (50mV/div,
AC Coupled)
Channel 4:
VCC (1V/div)
Channel 3:
VOUT (1V/div)
Channel 2:
IIN (500mA/div)
Channel 1:
IOUT (500mA/div)
Channel 2:
IIN (500mA/div)
Channel 1:
IOUT (500mA/div)
Time (5s/div)
Time (1s/div)
Figure 9: Startup Waveform
Pulsed 1.2A Load.
Designator
Description
ENIU (J1)
Enable (ENIU Input)
ENIL (J2)
Enable (ENIL Input)
VCC (TB1 or P2)
GND (TB1 or P4)
OUT (TB2 or P3)
GND (TB2 or P5)
Input Voltage
VIN ground connections
Output Voltage
VOUT ground connections
Time (1ms/div)
Figure 10: GPRS Transmit 2-Slot Ch975, 33dBm.
Default Setting
Additional Current
Pins 2 and 3 enable the AAT4621 and
upper current limit
Pins 2 and 3 enable AAT4621 and lower
current limit
Connect to 3.7V
Connect to ground
Connect to load
Connect to ground
1.282mA both pins 2-3 connected
0.97µA both pins 1-2 connected
1.282mA both pins 2-3 connected
0.97µA both pins 1-2 connected
Table 1: Jumper Settings, Test Points and Connector Locations on PCB Shown in Figures 2, 3 and 4.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202271A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 16, 2012
5
EVALUATION BOARD DATA SHEET
EV144
Evaluation Board for the AAT4621
PC Card Current Limit Interface and Capacitor Charger
Figure 11: Top Layer Routing.
Figure 12: Bottom Layer Routing/Ground Plane.
6
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202271A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 16, 2012
EVALUATION BOARD DATA SHEET
EV144
Evaluation Board for the AAT4621
PC Card Current Limit Interface and Capacitor Charger
Item
Description
1
2
3
4
5
Resistor, 1.5kΩ, 5%, SMT, 0402
Resistor, 200kΩ, 5%, SMT, 0402
Resistor, 1MΩ, 5%, SMT, 0402
Resistor, 120kΩ, 5%, SMT, 0402
Resistor, 47.5kΩ, 5%, SMT, 1206
SuperCapacitor, HS206, 550mF / 5.5V, 85mW ESR,
SMT, 39mm x 17mm
6
7
Capacitor, Ceramic, 10µF / 16V, X7R, SMT, 1206
8
9
LED, CMD15-21SRC/TR8, Super RED, SMT, 1206
IC, AAT4621IWO-T1, TDFN33-14
10
Pin Connector
11
12
2.54mm, 3 Pin Jumper
1725656, Conn. Term Block 2.54MM 2POS
Manufacturer
Quantity
Reference
FengHua, Neohm, Yageo, Vishay
1
1
1
1
2
R1
R2 – RHYS
R3 – ISETU
R4 – ISETL
R5, R6
CAPXX
1
SC1
2
C1, C2
1
1
D1
U1
VIN, VOUT, LDO,
GND (3)
J1
TB1, TB2
AVX, Panasonic, Kemet, Murata, TDK, FengHua, Taiyo Yuden
CML Innovative Technologies
Skyworks
Molex, Hirose
Phoenix Contact
5
2
2
Table 2: Component List (BOM).
Manufacturer Web Sites
http://www.avxcorp.com/
http://www.cap-xx.com/
http://www.cml-it.com/
http://www.component.tdk.com/
http://www.fenghua.com/
http://www.molex.com
http://www.murata.com/http://www.phoenixcon.com/
http://www.t-yuden.com/
http://www.vishay.com/
http://www.sh.rsprc.com/
http://www.digikey.com/
http://www.sumida.com/
http://www.hirose.com/
http://www.yageo.com/
Distributor Web Sites
http://www.rs-components.com/index.html
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202271A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 16, 2012
7
EVALUATION BOARD DATA SHEET
EV144
Evaluation Board for the AAT4621
PC Card Current Limit Interface and Capacitor Charger
Ordering Information
Part Number
IIN
IC Package
Pins
Kit Contents
AAT4621EV-TDFN
800/96mA
TDFN33-14
14
AAT4621EV User Guide Fully Assembled 2 Layer PCB
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202271A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 16, 2012