General Description
The MAX8530/MAX8531 evaluation kit (EV kit) is a fully
assembled and tested surface-mount circuit board that
contains two separate low-dropout (LDO) regulator cir-
cuits. The left circuit utilizes a MAX8530 and is config-
ured for outputs of 2.85V at 200mA and 2.60V at
150mA. The right circuit uses a low-noise MAX8531
and is configured for outputs of 2.85V at 200mA and
2.85V at 150mA.
The MAX8530/MAX8531 EV kit features on-board shut-
down control and a jumper-selectable RESET output
voltage (MAX8530 only). Both circuits are separate from
each other and do not share a common ground plane.
Features
♦Dual-Output Power Supply
MAX8530: 2.85V at 200mA, 2.60V at 150mA
MAX8531: 2.85V at 200mA, 2.85V at 150mA
♦2.5V to 6.5V Input Supply Range
♦Selectable (140ms) RESET Output (MAX8530)
♦Low-Noise (40µVRMS) Outputs (MAX8531)
♦On-Board Shutdown Control
♦Surface-Mount Construction
♦Fully Assembled and Tested
Quick Start
Recommended Equipment
• One variable-DC power supply capable of supplying
up to 6.5V at 0.5A
• Three voltmeters
Procedure (MAX8530)
The MAX8530/MAX8531 EV kit is fully assembled and
tested. Follow the steps below to verify board operation.
Do not turn on the power supply until all connections
are completed:
1) Set the variable-DC power supply to 3.6V.
2) Ensure the variable-DC power supply is turned off.
3) Ensure shunts are placed across pins 1 and 2 of
jumpers JU1 and JU2.
4) Connect the power supply to the IN pad and the
corresponding GND pad.
5) Connect a voltmeter across the OUT1 pad and the
corresponding GND pad.
6) Connect a voltmeter across the OUT2 pad and the
corresponding GND pad.
7) Connect a voltmeter across the RESET pad and the
GND pad (located beside the IN pad).
Evaluate: MAX8530/MAX8531
MAX8530/MAX8531 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-2815; Rev 0; 4/03
Component List
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.
Ordering Information
DESIGNATION QTY DESCRIPTION
A1 1 MAX8530ETT 6-pin QFN (Note 1)
C1, C4 2
2.2µF ±20%, 10V X5R ceramic
capacitors (0805)
TDK C2012X5R1A225M (Note 2)
C2, C5 2
2.2µF ±20%, 6.3V X5R ceramic
capacitors (0603)
TDK 1608X5R0J225M
C3, C6 2
1.0µF ±20%, 10V X5R ceramic
capacitors (0603)
TDK C1608X5R1A105M
C7 1
0.01µF ±20%, 25V X7R ceramic
capacitor (0402)
TDK C1005X7R1E103M
JU1, JU2, JU3 3 Jumpers, 3-pin headers
R1 1 100kΩ ±5% resistor (0402)
U1 1 MAX8530EBTJO (2 x 3 UCSP)
U2 1 MAX8531EBTJJ (2 x 3 UCSP)
None 3 Shunts
None 1 MAX8530/MAX8531 EV kit PC board
Note 1: A1 is for display purposes only (not a functional com-
ponent).
Note 2: If the input voltage is less than 6.3V, capacitors C1 and
C4 can be reduced in size.
PART TEMP RANGE IC PACKAGE
MAX8530/MAX8531EVKIT 0°C to +70°C 2 x 3 UCSP
Evaluate: MAX8530/MAX8531
8) Turn on the variable-DC power supply.
9) Verify the voltage at OUT1 is 2.85V.
10) Verify the voltage at OUT2 is 2.60V.
11) Verify the voltage at RESET is 2.85V.
Procedure (MAX8531)
The MAX8530/MAX8531 EV kit is fully assembled and
tested. Follow the steps below to verify board operation.
Do not turn on the power supply until all connections
are completed:
1) Set the variable-DC power supply to 3.6V.
2) Ensure the variable-DC power supply is turned off.
3) Ensure a shunt is placed across pins 1 and 2 of
jumper JU3.
4) Connect the power supply to the IN2 pad and the
corresponding GND2 pad.
5) Connect a voltmeter across the OUT21 pad and the
corresponding GND2 pad.
6) Connect a voltmeter across the OUT22 pad and the
corresponding GND2 pad.
7) Turn on the variable-DC power supply.
8) Verify the voltage at OUT21 is 2.85V.
9) Verify the voltage at OUT22 is 2.85V.
Detailed Description
The MAX8530/MAX8531 EV kit contains two separate
low-dropout (LDO) regulator circuits. Either circuit can
be powered from a DC power supply with a 2.5V to
6.5V input range.
The left circuit (MAX8530) provides two fixed output
voltages (2.85V and 2.60V) at 200mA and 150mA. A
MAX8530 in a 6-pin UCSP package is used for this cir-
cuit. PC board pads for the SHDN signal and the
RESET signal are provided on the circuit to interface
with an external controller.
The right circuit (MAX8531) provides two fixed output
voltages (2.85V and 2.85V) at 200mA and 150mA. A
low-noise MAX8531 in a 6-pin UCSP™ package is used
for this circuit. PC board pads for the SHDN signal are
provided on the circuit to interface with an external
controller.
The MAX8530/MAX8531 EV kit provides on-board shut-
down control as well as a jumper-selectable RESET
output voltage for the MAX8530. The left and right cir-
cuits are separate from each other and do not share a
common ground plane.
Shutdown Control
The MAX8530/MAX8531 has an active-low shutdown
control input that enables/disables both of the power
outputs. JU1 (MAX8530) or JU3 (MAX8531) selects the
circuit operating modes: shutdown or normal operation.
When driving SHDN with an external signal, remove the
shunt and connect a signal source to the SHDN pad
(MAX8530) or the SHDN2 pad (MAX8531). See Table 1
for shunt positions.
MAX8530/MAX8531 Evaluation Kit
2 _______________________________________________________________________________________
Component Suppliers
SUPPLIER PHONE FAX WEBSITE
TDK 847-803-6100 847-390-4405 www.component.tdk.com
Note: Please indicate that you are using the MAX8530 or MAX8531 when contacting this component supplier.
Table 1. Shutdown Selection
JUMPER SHUNT
POSITION SHDN PIN DESCRIPTION
JU1/JU3 1 and 2* Connected to IN MAX8530/MAX8531 Outputs Enabled. RESET is high impedance
when all outputs are in regulation (MAX8530).
JU1/JU3 2 and 3 Connected to GND MAX8530/MAX8531 Outputs Disabled. RESET is low impedance
(MAX8530).
*Default configuration: JU1/JU3 (1 and 2).
UCSP is a trademark of Maxim Integrated Products, Inc.
Selecting the
RESET
Output Voltage
(MAX8530)
The RESET pin of the MAX8530 indicates the status of
the voltage at OUT1 only. Monitor this voltage at the
RESET pad. The RESET pin is pulled up with a 100kΩ
resistor through jumper JU2 to one of two outputs (see
Table 2 for shunt positions). There is also a version that
has an internal 100kΩpullup to OUT1. Contact factory
for availability.
Evaluate: MAX8530/MAX8531
MAX8530/MAX8531 Evaluation Kit
_______________________________________________________________________________________ 3
*Default configuration: JU2 (1–2).
Table 2. RREESSEETTOutput Selection
JUMPER SHUNT
POSITION DESCRIPTION
JU2 1 and 2* RESET pin pulled up to OUT1 (2.85V)
JU2 2 and 3 RESET pin pulled up to OUT2 (2.60V)
2
MAX8530
GND
OUT2
31
JU2
C3
1µF
C2
2.2µF
C1
2.2µFGND
OUT1
R1
100kΩRESET
U1
1
JU1
2
3
GND
IN
SHDN
B2
A2
OUT1
OUT2
RESET
B3
B1
SHDN
IN
GND
A3
A1
MAX8531
GND2
OUT22
C6
1µF
C5
2.2µF
C4
2.2µFGND2
OUT21
U2
1
JU3
2
3
GND2
IN2
SHDN2
B2
A2
OUT1
OUT2
BP
B3
B1
SHDN
IN
GND
A3
A1
C7
0.01µF
Figure 1. MAX8530/MAX8531 EV Kit Schematic
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.
4_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Evaluate: MAX8530/MAX8531
MAX8530/MAX8531 Evaluation Kit
Figure 2. MAX8530/MAX8531 EV Kit Component Placement
Guide—Component Side
Figure 3. MAX8530/MAX8531 EV Kit PC Board Layout—
Component Side
Figure 4. MAX8530/MAX8531 EV Kit PC Board Layout—
Solder Side
