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19-3237; Rev 0; 9/04
MAX8559 Evaluation Kit
General Description
The MAX8559 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains two independent dual-output low-dropout (LDO) regulator circuits. The top circuit utilizes the TDFN package and is configured for outputs of 2.85V at 300mA and 1.8V at 300mA. The bottom circuit uses the UCSPTM package to minimize board space and is configured for 3.0V at 150mA and 2.85V at 150mA. Each circuit features two on-board shutdown controls, one for each regulator output. Pulling both shutdown controls low places the corresponding MAX8559 into a 0.01A low-power shutdown mode.
Features
Dual-Output Power Supply MAX8559ETA: 2.85V at 300mA and 1.8V at 300mA MAX8559EBA: 3.0V at 150mA and 2.85V at 150mA 2.5V to 6V Input Supply Range Low-Noise (<40VRMS) Outputs Individual On-Board Shutdown Control Surface-Mount Construction Fully Assembled and Tested
Evaluates: MAX8559
Component List
DESIGNATION C1, C4, C5 QTY 3 DESCRIPTION 4.7F, 6.3V X5R ceramic capacitors (0603) Murata GRM188R60J475KE19 0.01F, 25V X7R ceramic capacitors (0402) Taiyo Yuden TMK105BJ103KV 2.2F, 6.3V X5R ceramic capacitors (0603) Murata GRM185R60J225K PART MAX8559EVKIT
Ordering Information
TEMP RANGE 0C to +70C IC PACKAGE 8 TDFN 8 UCSP
C3, C8
2
Quick Start
Recommended Equipment
* One variable DC power supply capable of supplying up to 6V at 0.8A * Two voltmeters (DMM)
C7, C9, C10 SHDNA, SHDNB, SHDNA2, SHDNB2 Shunts U1 U2 None
3
4
3-pin headers
Procedure (MAX8559ETA, TDFN Package)
The MAX8559 EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Set the power supply to 3.6V. 2) Ensure the power supply is turned off. Do not turn on the power supply until all connections are completed. 3) Ensure shunts are placed across pins 2 and 3 of jumpers SHDNA and SHDNB on the MAX8559 EV kit. 4) Connect the positive output of the power supply to the VIN pad on the PC board and the negative output of the power supply to the GND pad. 5) Connect a voltmeter across the VOUTA pad on the PC board and the corresponding GND pad. 6) Connect a voltmeter across the VOUTB pad on the PC board and the corresponding GND pad. 7) Turn on the power supply. 8) Verify the voltage at VOUTA is 2.85V. 9) Verify the voltage at VOUTB is 1.8V.
1
4 1 1 1
Shunts MAX8559ETA (TDFN) MAX8559EBA (UCSP) MAX8559 EV kit PC board
Component Suppliers
SUPPLIER Murata Taiyo Yuden PHONE 814-237-1431 408-573-4150 WEBSITE www.murata.com www.t-yuden.com
Note: Indicate that you are using the MAX8559 when contacting these component suppliers.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX8559 Evaluation Kit Evaluates: MAX8559
Procedure (MAX8559EBA, UCSP Package)
The MAX8559 EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Set the power supply to 3.6V. 2) Ensure the power supply is turned off. Do not turn on the power supply until all connections are completed. 3) Ensure shunts are placed across pins 2 and 3 of jumpers SHDNA2 and SHDNB2 on the MAX8559 EV kit. 4) Connect the positive output of the power supply to the VIN2 pad on the PC board and the negative output of the power supply to the GND2 pad. 5) Connect a voltmeter across the VOUTA2 pad on the PC board and the corresponding GND2 pad. 6) Connect a voltmeter across the VOUTB2 pad on the PC board and the corresponding GND2 pad. 7) Turn on the power supply. 8) Verify the voltage at VOUTA2 is 3.0V. 9) Verify the voltage at VOUTB2 is 2.85V.
Detailed Description
The MAX8559 EV kit contains two separate LDO regulator circuits. Either circuit can be powered from a DC power supply with a 2.5V to 6V input range. The top and bottom circuits are separate from each other and do not share a common ground plane. The top circuit (MAX8559ETA) provides two fixed output voltages (2.85V and 1.8V) at 300mA each. The TDFN package is 3mm x 3mm and allows 1.95W of power dissipation. SHDNA and SHDNB are wired out to jumpers for selection between VIN and GND. The bottom circuit (MAX8559EBA) provides two fixed output voltages (3.0V and 2.85V) at 150mA each. This circuit is used to demonstrate the excellent low-noise performance of the MAX8559. SHDNA and SHDNB are wired out to jumpers for selection between VIN and GND.
Shutdown Control
The MAX8559 has two SHDN_ inputs. A logic low on SHDNA shuts down regulator A, while a logic low on SHDNB shuts down regulator B. If SHDNA and SHDNB are both low, both regulators and the internal reference are off and the supply current is reduced to 10nA. If either SHDNA or SHDNB is a logic high, the internal reference is on. See Table 1 and Table 2 for shunt positions.
Table 1. Shutdown Selection (MAX8559ETA, TDFN Package)
SHDNA JUMPER POSITION 1 and 2 2 and 3 1 and 2 2 and 3* SHDNA Connected to GND Connected to VIN Connected to GND Connected to VIN SHDNB JUMPER POSITION 1 and 2 1 and 2 2 and 3 2 and 3* SHDNB Connected to GND Connected to GND Connected to VIN Connected to VIN DESCRIPTION Both regulators are shut down. Typical supply current is 10nA. Regulator A is enabled, regulator B is shut down. Regulator A is shut down, regulator B is enabled. Both outputs are enabled.
*Default configuration for SHDNA and SHDNB jumpers.
2
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MAX8559 Evaluation Kit Evaluates: MAX8559
Table 2. Shutdown Selection (MAX8559EBA, UCSP Package)
SHDNA2 JUMPER POSITION 1 and 2 2 and 3 1 and 2 2 and 3* SHDNA Connected to GND2 Connected to VIN2 Connected to GND2 Connected to VIN2 SHDNB2 JUMPER POSITION 1 and 2 1 and 2 2 and 3 2 and 3* SHDNB Connected to GND2 Connected to GND2 Connected to VIN2 Connected to VIN2 DESCRIPTION Both outputs are shut down. Typical supply current is 10nA. Regulator A is enabled, regulator B is shut down. Regulator A is shut down, regulator B is enabled. Both outputs are enabled.
*Default configuration for SHDNA2 and SHDNB2 jumpers.
VIN GND C1 4.7F
1
INA
OUTA
8 C4 4.7F
VOUTA GND
U1
4 3 2 1 INB
MAX8559ETA
BP 7 C3 0.01F
SHDNA 3 2 1
2
SHDNA
SHDNB
3
SHDNB GND 6
OUTB
5 C5 4.7F
VOUTB GND
VIN2 GND2 C7 2.2F
A1
INA
OUTA
B1 C9 2.2F
VOUTA2 GND2
U2
A4 3 2 1 INB
MAX8559EBA
BP B2 C8 0.01F
SHDNA2 3 2 1
A2
SHDNA
SHDNB2
A3
SHDNB GND B3
OUTB
B4 C10 2.2F
VOUTB2 GND2
Figure 1. MAX8559 EV Kit Schematic
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3
MAX8559 Evaluation Kit Evaluates: MAX8559
Figure 2. MAX8559 EV Kit Component Placement Guide--Component Side 4 _______________________________________________________________________________________
MAX8559 Evaluation Kit Evaluates: MAX8559
Figure 3. MAX8559 EV Kit PC Board Layout--Component Side
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5
MAX8559 Evaluation Kit Evaluates: MAX8559
Figure 4. MAX8559 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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