View MAX1773EVKIT_343610.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1918; Rev 0; 1/01
MAX1773 Evaluation Kit
General Description
The MAX1773 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that routes charge and discharge currents between two battery packs, a buck step-down battery charger, and an ACadapter power source. The circuit uses a MAX1773 IC in a 20-pin TSSOP package and is configured for an AC-adapter input range of +4.75VDC to +28VDC. The EV kit uses seven P-channel MOSFETs to steer current between the power sources and the load. The battery minimum voltage level sets the threshold for battery undervoltage conditions and can be adjusted from +4.65V to +13V. The EV kit features an SMBusTM signal multiplexer that routes SMBus signals for the smart battery packs. LEDs are provided to indicate the status of the AC adapter and battery packs. The MAX1773 EV kit also demonstrates low-current usage with several options to reduce current usage. o Up to 5A Steering Capability o P-Channel MOSFET Steering Switches o Adjustable Battery Minimum Voltage Level o SMBus Multiplexer o AC-Present and Battery-Status LEDs o Interfaces to MAX1772EVKIT Battery Charger o Surface-Mount Components o Fully Assembled and Tested
Features
o +4.75V to +28V AC-Adapter Input Range
Evaluates: MAX1773
Ordering Information
PART MAX1773EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 20 TSSOP
Component List
DESIGNATION C1, C6 QTY 2 DESCRIPTION 0.1F, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 33F, 35V low-ESR tantalum capacitors AVX TPSD336035R0300 or Kemet T495X226K035AS4394 recommended Not installed, 33F, 35V lowESR capacitors AVX TPSD336035R0300 or Kemet T495X226K035AS4394 recommended 4.7F, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475KG 0.1F, 16V X7R ceramic capacitors (0603) Taiyo Yuden EMK107BJ104MA 0.33F, 16V X7R, ceramic capacitor (0805) Taiyo Yuden EMK212BJ334KG DESIGNATION QTY DESCRIPTION 1.5F, 25V low-ESR tantalum capacitors AVX TPSA155K025R0300 or Kemet T494A105(1)025AS 250mA, 75V switching diode (SOT23) Central Semiconductor CMPD914 Green surface-mount LEDs (SS) Panasonic P521CT 8A, -30V P-channel MOSFETs (SuperSOT8) Fairchild FDR858P 100k 1% resistors (0805) 10k 1% resistor (0805) 3.3k 5% resistor (0805) 28.7k 1% resistor (0805) 100k potentiometer (9mm) Mouser 323-409H-100K 40.2k 1% resistor (0805)
C13, C14
2
C2, C3
2
D1
1
D2, D3
2
C4, C5
0
P1-P7 R1, R3 R2 R4 R5 R6
7 2 1 1 1 1 1
C7
1
C8, C9, C10, C12
4
C11
1
R7
SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX1773 Evaluation Kit Evaluates: MAX1773
Component List (continued)
DESIGNATION R8, R9 R10, R11 R12, R13, R14 R15-R18 TB1, TB2 QTY 2 2 3 4 2 DESCRIPTION 430 5% resistors (0805) 510k 5% resistors (0805) 8.2k 5% resistors (0805) 10k 5% resistors (0805) 5-point terminal blocks (0.2in center) Mouser 506-2MV05 3-position, SPDT, slide switches Mouser 612-EG1218 3-pin headers Shunts (JU2-JU5) 2-pin headers MAX1773EUP (20-pinTSSOP) MAX1615EUK (5-pin SOT23) MAX4066CEE (16-pin QSOP) SN74AHC14PWR (14-pin TSSOP) MAX6816EUS-T (4-pin SOT143) MAX1773 PC board MAX1773 data sheet MAX1773 EV kit data sheet
Quick Start
The MAX1773 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed.
Power-Up Sequence
Note: See the connection diagram (Figure 1). 1) Rotate potentiometer R6 completely clockwise. 2) Verify that shunts JU2 (AC_PRESENT), JU3 (BATT_STAT), JU4 (R16, CLK) and JU5 (R17, DAT) are across pins 1 and 2. 3) Verify that switches SW1 and SW2 are in position 1 (B battery). 4) Connect a +28VDC power supply to the ADAPTER_IN pad. Connect the supply ground to the GND pad next to the ADAPTER_IN pad. 5) Connect the EXT_LOAD pad to the battery charger input. Connect the battery charger ground to the GND pad next to the EXT_LOAD pad. 6) Connect the battery charger positive output to the CHARGER pad on the EV kit. Connect the battery charger ground to the EV kit GND pad near the CHARGER pad. 7) Connect two battery packs or two smart-battery packs (packs with an SBS-IF-compliant connector) to the battery terminals TB1 (A battery) and TB2 (B battery) on the EV kit. Observe the correct polarity during connection. If you are using non-SBS-IFcompliant batteries, add a 10k pulldown resistor on the BATT_A_T and BATT_B_T pins on the battery side of connectors TB1 and TB2. 8) Connect a voltmeter to the EXT_LOAD and GND pads. 9) Turn on the power supply, and verify that the EXT_LOAD output voltage is approximately +28V. 10)Connect a voltmeter to test point 1 (TP1) and ground. Rotate potentiometer R6 to obtain 1.5V at TP1 (battery minimum voltage level = 7.5V). For instructions on using the SMBUS interface, see the SMBus Interface section.
SW1, SW2 JU2, JU3 None JU4, JU5 U1 U2 U3, U4 U5 U6 None None None
2 2 4 2 1 1 2 1 1 1 1 1
Component Suppliers
SUPPLIER AVX Central Fairchild Kemet Panasonic Taiyo Yuden PHONE 803-946-0690 516-435-1110 408-822-2000 864-963-6300 201-392-7522 408-573-4150 FAX 803-626-3123 516-435-1824 408-822-2102 864-963-6521 201-392-4441 408-573-4159
Note: Please indicate that you are using the MAX1773 when contacting these component suppliers.
Detailed Description
The MAX1773 EV kit circuit routes charge and discharge currents between two battery packs (regular or smart), a buck step-down battery charger (MAX1772 EV kit recommended), and an AC adapter or DC power source. The circuit uses a MAX1773 in a 20-pin TSSOP package to control seven steering P-channel MOSFET
2 _______________________________________________________________________________________
MAX1773 Evaluation Kit Evaluates: MAX1773
GND
BATTERY B
CHARGER
MAX1773 EV KIT
TB2 B+ BATTERY CHARGER EXT_LOAD INPUT GND ADAPTER_IN GND OUTPUT
GND
A+ TB1 GND
BATTERY A
[DC SUPPLY]
Figure 1. Connection Diagram
switches. A MAX1615 low-power linear regulator provides the circuit board's +3.3V power for logic ICs and status LEDs. The EV kit's AC-adapter input (ADAPTER_IN) range is from +4.75VDC to +28VDC. A battery minimum voltage-level potentiometer (R6) allows easy adjustment of the level from +4.65V to +13V. Upon reaching this threshold, an automatic switchover between batteries occurs. See the Battery Minimum Voltage-Level Adjustment section for more information on adjusting the level. The EV kit features an SMBus signal multiplexer for smart battery packs. Two MAX4066 CMOS analog switches and a 74AHC14 inverter are used for multiplexing SMBus signals between both batteries. Manually operated switches (SW1, SW2) are provided to select between battery A or B selection and SMBus multiplexer battery A or B data selection. LEDs indicate the status of the AC adapter and battery. The LEDs are driven by a pair of inverters and can be disabled by jumpers. Jumpers are provided to disable the CMOS analog switches, CMOS switch debouncer, and inverter ICs for evaluating power usage.
2-pin jumper, JU1, selects the shutdown mode for the inverters. Table 1 lists the selectable jumper options.
Table 1. Jumper JU1 Functions
SHORT LOCATION 1 and 2 (PC trace shorted) None (PC trace short cut open) INVERTER (U5) VCC PIN Connected to +3.3V INVERTER OUTPUT Inverters powered up Inverters powered down, inverter shutdown mode
None
AC_PRESENT LED Shutdown The EV kit features a jumper to enable or disable the AC_PRESENT LEDs. The 3-pin jumper, JU2, selects the mode for the inverters driving the LEDs. Table 2 lists the jumper options. BATT_STAT LED Shutdown The MAX1773 EV kit features a jumper to enable or disable the BATT_STAT LEDs. The 3-pin jumper, JU3, selects the mode for the inverters driving the LEDs. Table 3 lists the jumper options.
Jumper Selection
Inverter Shutdown Mode The MAX1773 EV kit features a shutdown mode for the inverters (U5) to reduce the EV kit's overall current. The
_______________________________________________________________________________________
3
MAX1773 Evaluation Kit Evaluates: MAX1773
Table 2. Jumper JU2 Functions
SHUNT LOCATION INVERTER (U5B) INPUT PIN AC_PRESENT signal feeds inverter AC_PRESENT signal bypassed LED OPERATING MODE AC_PRESENT LED state driven by MAX1773 AC_PRESENT LED state forced off
Table 5. Jumper JU5 Functions
SHUNT LOCATION 1 and 2 R17 RESISTOR R17 connected to +3.3V R17 is floating DAT SIGNAL DAT signal pulled up to +3.3V by R17 Multiplexer controls CLK
1 and 2
None
2 and 3
Table 6. Jumper JU6 Functions
SHORT LOCATION 1 and 2 (PC trace shorted) None (PC trace short cut open) SWITCH (U3) V+ PIN Connected to +3.3V CMOS ANALOG SWITCHES SMBus CMOS analog switches (U3) powered up SMBus CMOS analog switches (U3) powered down
Table 3. Jumper JU3 Functions
SHUNT LOCATION INVERTER (U5E) INPUT PIN BATT_STAT signal feeds inverter BATT_STAT signal bypassed LED OPERATING MODE BATT_STAT LED state driven by MAX1773 and inverters BATT_STAT LED state forced off
None
1 and 2
Table 7. Jumper JU7 Functions
SHORT LOCATION 1 and 2 (PC trace shorted) None (PC trace short cut open) SWITCH (U4) V+ PIN Connected to +3.3V CMOS ANALOG SWITCHES SMBus CMOS analog switches (U4) powered up SMBus CMOS analog switches (U4) powered down
2 and 3
SMBus Pullup Resistors The MAX1773 EV kit features pullup resistors for the SMBUS CLK and DAT signals. The CLK and DAT pullup resistors (R16, R17) can be disabled by the 2pin jumpers JU4 and JU5, respectively. Tables 4 and 5 list the selectable jumper options. CMOS Analog Switches, Shutdown Mode The MAX1773 EV kit features a shutdown mode for the CMOS analog switches (MAX4066) to reduce the MAX1773 EV kit's overall current. The 2-pin jumpers, JU6 and JU7, select the shutdown mode for the CMOS analog switches. Tables 6 and 7 list the selectable jumper options.
None
Table 4. Jumper JU4 Functions
SHUNT LOCATION 1 and 2 R16 RESISTOR R16 connected to +3.3V R16 is floating CLK SIGNAL CLK signal pulled up to +3.3V by R16 Multiplexer controls CLK
CMOS Switch Debouncer, Shutdown Mode The MAX1773 EV kit features a shutdown mode for the CMOS switch debouncer (MAX6816) to reduce the MAX1773 EV kit's overall current. Two jumpers, JU8 and JU9, select the shutdown mode for the CMOS switch debouncer IC. Tables 8 and 9 list the selectable jumper options.
Switch Selection Modes
Battery Selection Interface The MAX1773 EV kit features a battery-pack selection interface to select which battery pack is connected to terminals TB1 (battery A) and TB2 (battery B) and may be charged. A three-position switch (SW1) is utilized to select which smart-battery pack will be controlled by the MAX1773 IC.
None
4
_______________________________________________________________________________________
MAX1773 Evaluation Kit
Table 8. Jumper JU8 Functions
SHORT LOCATION 1 and 2 (PC trace shorted) None (PC trace short cut open) VCC PIN Connected to +3.3V CMOS SWITCH DEBOUNCERS CMOS switch debouncer IC (U6) powered up CMOS switch debouncer IC (U6) powered down
select which smart-battery pack will be connected to the SMBus interface. The switch's center position allows an external controller to select which battery is desired by pulling the COMM pad logic high or low. Table 11 below lists switch SW2 options. Jumpers JU4 and JU5 allow CLK and DAT to be pulled up to logic high with built-in resistors (R16, R17). See the SMBus Pullup Resistors section for jumper selection.
Evaluates: MAX1773
None
Table 11. Switch SW2 Functions
SWITCH POSITION 1 INVERTER (U5A) INPUT PIN Connected to +3.3V COMM CONTROLS SMBus connected to battery B External controller selects battery A (low) or battery B (high, +3.3V) for SMBus SMBus connected to battery A
Table 9. Jumper JU9 Functions
SHORT LOCATION 1 and 2 (PC trace shorted) None (PC trace short cut open) OUT PIN Connected to BATT_SEL input CMOS SWITCH DEBOUNCERS CMOS switch debouncer output CMOS switch debouncer IC (U6) output floating
2
None, external controller toggles COMM pad
None
3
Connected to GND
The switch's center position allows an external controller to select which battery is desired by pulling the BATT_SEL pad high or low. Table 10 lists switch SW1 options. Caution: Do not connect an external controller to the BATT_SEL pad while switch SW1 is in position 1 or 3 since the external controller may be damaged. SMBus Interface The MAX1773 EV kit features an SMBus signal multiplexer for the smart-battery packs connected to terminals (TB1, TB2) and the SMBus interface signals (CLK, DAT, T). A three-position switch (SW2) is utilized to
Caution: Do not connect an external controller to the COMM pad while switch SW2 is in position 1 or 3 since the external controller may be damaged.
Battery Minimum Voltage Level
Battery Minimum Voltage Level Adjustment The MAX1773 EV kit features a potentiometer to adjust the battery minimum voltage level. Potentiometer R6 adjusts the battery minimum voltage level from +4.65V to +13V. The battery minimum voltage level is adjusted by the voltage at test point TP1. The battery minimum voltage level is equal to the voltage at TP1 multiplied by 5 (VTP1 x 5; i.e., +7.5V level = 1.5V x 5). Rotate R6 counterclockwise to decrease the battery minimum voltage level or clockwise to increase it.
Table 10. Switch SW1 Functions
SWITCH POSITION 1 MAX1773 BAT_SEL PIN Connected to +3.3V None, external controller toggles BATT_SEL pad Connected to GND BATT_SEL CONTROLS Battery B selected External controller selects battery A (low) or battery B (high, +3.3V) Battery A selected
Using the MAX1772 EV Kit Charger with the MAX1773 EV Kit
MAX1772 EV Kit Charger Connections The MAX1773 EV kit can be used with the MAX1772 EV kit charger. For correct connection between the two EV kits, jumper JU4 must be cut open on the MAX1772 EV kit. Refer to the MAX1772 EV kit data sheet for additional information on jumper JU4. Figure 2 shows how to connect the MAX1772 EV kit to a MAX1773 EV kit, AC adapter, two batteries, and a load.
5
2
3
_______________________________________________________________________________________
MAX1773 Evaluation Kit Evaluates: MAX1773
GND BATTERY B TB2 B+
CHARGER
MAX1773 EV KIT
GND EXT_LOAD
GND
A+ TB1 GND
ADAPTER_IN
GND
BATTERY A
GND
DC EXTLOAD ADAPTER_IN LOAD
LOAD
AC ADAPTER OR DC SOURCE
MAX1772 EV KIT
GND
GND BATT
Figure 2. MAX1772 EV Kit Charger to MAX1773 EV Kit Connection Diagram
6
_______________________________________________________________________________________
EXT_LOAD EXT_LOAD J2 C2 33F 35V C3 33F 35V C4 OPEN C5 OPEN GND J5 P7 C6 0.1F 2 GND MAX1615 4 R3 100k 1% TP8 9 PDS TCOMP VDD 2 TP1 +3.3V U5-E 1 JU3 11 2 3 10 13 U5-F 12 7 6 11 U5-B 1 JU2 2 3 BATT_B+ TP6 17 EXT_LOAD 18 R14 8.2k +3.3V B TP5 P4 CHARGER TP7 P6 P5 C14 1.5F 3 4 5 U5-C 6 C11 R5 0.33F 28.7k 1% R7 40.2k 1% 15 R6 3 100k 1 R10 510k R8 430 BATT_STAT D2 14 10 ACDET 13 BATSEL 8 EXTLD 5/3 (FB) U2 1 IN 5 SHDN OUT C7 4.7F R2 10k 1% +3.3V 3
ADAPTER_IN J1
GND
C1 0.1F R4 3.3k TP9 R13 8.2k
Figure 3. MAX1773 EV Kit Schematic
R1 100k 1% D1 P2 TP3 GND BATSTAT TP4 DISA ACPRES R11 510k BATT_B_T CHGA U1 19 THMB 20 BATB 16 COMB 12 +3.3V EXT_LOAD TP2 R12 8.2K 3 4 2 THMA 1 BATA 5 COMA MINV R9 430 AC_PRESENT D3
J4
+3.3V
BATT_SEL
B
BATT_A_T
BATT_A+
C13 1.5F 25V
P3
CHARGER J3
P1
GND
CHARGER
J7
MAX1773
DISB
1 GND VCC IN OUT U6 3 JU9 JU8
C12 0.1F 4
CHGB
GND
1
3
2
2
SW1 MAX6816
Evaluates: MAX1773
_______________________________________________________________________________________
MAX1773 Evaluation Kit
7
Evaluates: MAX1773
MAX1773 Evaluation Kit
Figure 4. MAX1773 EV Kit Schematic, SMBus Signal Multiplexers
+3.3V 1 JU6 2 C8 0.1F 1 4 U3-B 6 TB2 BATT_B+ BATT_B+ BATT_B_CLK BATT_B_DAT BATT_B_T GND CLK MAX4066 2 13 U3-D 14 4 5 +3.3V 3 12 10 U3-C 7 +3.3V +3.3V 1 JU7 2 9 1 JU4 JU5 5 8 TB1 15 1 BATT_A+ 2 3 4 5 BATT_A+ BATT_A_CLK BATT_A_DAT BATT_A_T GND +3.3V 16 2 U3-A R16 10k R17 10k DAT 1 JU1 2 C10 0.1F 14 8 2 7 9 U5-D 12 U4-D 14 MAX4066 10 U4-C 7 9 13 8 15 6 COMM 1 U5-A BATT_A_T 2 U4-A U4-B 1 4 5 R18 10k 16 C9 0.1F R15 10k BATT_B_T T GND
8
+3.3V
COMM
COMM
+3.3V
1
SW2
2
_______________________________________________________________________________________
3
MAX1773 Evaluation Kit Evaluates: MAX1773
1.0"
1.0"
Figure 5. MAX1773 EV Kit Component Placement Guide-- Component Side
Figure 6. MAX1773 EV Kit PC Board Layout--Component Side
1.0"
1.0"
Figure 7. MAX1773 EV Kit PC Board Layout--Inner Layer 2
Figure 8. MAX1773 EV Kit PC Board Layout--Inner Layer 3
_________________________________________________________________________________________________
9
MAX1773 Evaluation Kit Evaluates: MAX1773
1.0"
Figure 9. MAX1773 EV Kit PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX1773EVKIT

	To Download MAX1773EVKIT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .