Evaluation Board User Guide
UG-591
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the ADP5134 Micropower Management Unit (PMU)
FEATURES
GENERAL DESCRIPTION
Full-featured evaluation board for the ADP5134
Standalone capability
Simple device measurements, including line and load
regulation, demonstrable with
A single voltage supply
A voltmeter
An ammeter
Load resistors
Easy access to external components
Cascading options to supply the low dropout (LDO) from
BUCK1 or BUCK2
Dedicated precision enable option on each channel for
easier power sequencing
Factory programmable soft start options
Factory programmable UVLO options
Power good pin for monitoring
Mode option to change bucks from PFM to PWM operation
This user guide describes the hardware for the evaluation
of the ADP5134 and includes detailed schematics and PCB
layouts. The ADP5134 is available in a 24-lead 4 mm × 4 mm
LFCSP package.
The ADP5134 LFCSP evaluation board has two step-down
regulators with two LDOs that enable evaluation of the
ADP5134. The evaluation board is available with an adjustable
voltage option.
Full details on the parts are provided in the ADP5134 data
sheet, which should be consulted in conjunction with this
evaluation board user guide.
11735-001
ADP5134 EVALUATION BOARD
Figure 1.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
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Evaluation Board User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Measuring the Switching Waveform of the Buck Regulator....7
General Description ......................................................................... 1
Measuring the Load Regulation of the Buck Regulator ...........7
ADP5134 Evaluation Board ............................................................ 1
Measuring Line Regulation of Buck ...........................................8
Revision History ............................................................................... 2
Measuring Buck Efficiency ..........................................................8
Setting Up the Hardware ................................................................. 3
Measuring Inductor Current .......................................................8
Enable ............................................................................................. 3
Measuring Line Regulation of LDO ...........................................8
Jumper J9 (MODE) ...................................................................... 3
Measuring Load Regulation of LDO ..........................................8
Input Power Source ...................................................................... 3
Measuring Dropout Voltage of LDO ..........................................8
Output Load .................................................................................. 4
Measuring Ground Current Consumption of LDO .................9
Input and Output Voltmeters...................................................... 4
Cascading an LDO from the Buck Regulator ............................9
Powering Up the Evaluation Board ................................................ 5
Connecting Regulators in Sequence ............................................ 10
Setting the Output Voltage of the Bucks ................................... 5
Measuring Output Voltage ............................................................ 11
Setting the Output Voltage of the LDOs ................................... 5
Measuring Ground Current .......................................................... 12
External Resistor Divider Setting for Bucks and LDOs .......... 5
Evaluation Board Schematics and Artwork ................................ 13
Regulator Sequencing Using External Resistors ...................... 5
Ordering Information .................................................................... 16
Power Good Pin for Output Voltage Monitoring .................... 6
Bill of Materials ........................................................................... 16
Measuring Performance .................................................................. 7
Related Links ................................................................................... 16
Measuring Output Voltage Ripple of the Buck Regulator....... 7
REVISION HISTORY
11/13—Revision 0: Initial Version
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Evaluation Board User Guide
UG-591
SETTING UP THE HARDWARE
CONNECT MODE PIN TO
VIN1 FOR FORCED
PWM MODE, CONNECT
TO GND FOR AUTOMATIC
MAIN SUPPLY PIN,
PWM/PSM MODE
FOR BUCK1 AND A VIN
CONNECT J21 TO ANY
OF THE FOUR VOLTAGES
FOR LDO1 SEQUENCING
ENABLE PIN FOR BUCK1,
CONNECT TO EITHER
VIN, GND, OR THE
SEQUENCER CIRCUIT
GND REFERENCE
TERMINALS
SENSE TERMINAL POSTS
FOR OUTPUT VOLTAGES
SUPPLY PIN FOR LDO1, CAN
DIRECTLY CONNECT TO VIN1
CONNECT J19 TO ANY
OF THE FOUR VOLTAGES
FOR BUCK1 SEQUENCING
ENABLE PIN FOR LDO1,
CONNECT TO EITHER VIN,
GND, OR SEQUENCER CIRCUIT
OUTPUT VOLTAGE
TERMINALS FOR BUCK1
AND BUCK2
OUTPUT VOLTAGE TERMINALS
FOR LDO1 AND LDO2
CONNECT J20 TO ANY
OF THE FOUR VOLTAGES
FOR BUCK2 SEQUENCING
SENSE TERMINAL POSTS
FOR OUTPUT VOLTAGES
OPTIONAL CONNECTOR
FOR MAIN SUPPLY
ENABLE PIN FOR BUCK2,
CONNECT TO EITHER VIN, GND,
OR SEQUENCER CIRCUIT
ADP5134 LFCSP CHIP
GND REFERENCE
TERMINALS
ENABLE PIN FOR LDO2,
CONNECT TO EITHER
VIN, GND, OR
SEQUENCER CIRCUIT
SUPPLY PINS FOR POWER GOOD
BUCK2 AND LDO2, PIN OUTPUT
CAN DIRECTLY
CONNECT TO VIN1
CONNECT J22 TO ANY
OF THE FOUR VOLTAGES
FOR LDO2 SEQUENCING
11735-002
LED CURRENT
SINK BLOCK
Figure 2. Evaluation Board Overview
JUMPER J9 (MODE)
The ADP5134 evaluation board is supplied fully assembled
and tested.
Before applying power to the evaluation board, follow the
procedures in this section.
ENABLE
Each channel has its own enable pin, which must be pulled high
to enable that channel (see Table 1).
Table 1. Channels of the Enable Pins
Channel
1
2
3
4
Enable Pin
J23
J24
J25
J26
The Jumper J9, as shown in Figure 2, is used to connect the
MODE pin of the device to either ground or VIN1. To force
BUCK1 and BUCK2 into forced PWM operation, shunt the
center contact of Jumper J9 (MODE) to the left pin header
to pull the MODE pin high to VIN1. To allow BUCK1 and
BUCK2 to operate in automatic PWM/PSM operation, shunt
the center contact of J9 (MODE) to the right pin header to pull
the MODE pin low to GND1.
INPUT POWER SOURCE
If the input power source includes a current meter, use that meter
to monitor the input current. The board allows easy connection of
all power supply pins to the main power source (VIN1).
To do this, shunt the center contact of Jumper J3 (VIN2) to the left
pin header to connect VIN2 to VIN1. Then, shunt Jumper J5 to
connect VIN3 to VIN1. You can also shunt Jumper J7 to connect
VIN4 to VIN1.
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Evaluation Board User Guide
Connect the positive terminal of the power source to J1 (VIN1) on
the evaluation board and the negative terminal of the power source
to J2 (GND).
If the power source does not include a current meter, connect
a current meter in series with the input source voltage. Connect
the positive lead (+) of the power source to the ammeter positive (+) connection, the negative lead (−) of the power source
to J2 (GND) on the evaluation board, and the negative lead (−)
of the ammeter to J1 (VIN1) on the board. Be aware that the
current meters add resistance to the input source, and this
voltage reduces with high output currents.
OUTPUT LOAD
Connect an electronic load or resistor to set the load current. If
the load includes an ammeter, or if the current is not measured,
connect the load directly to the evaluation board, with the positive
(+) load connected to one of the channels. For example, connect
BUCK1, J11 (VOUT1), and the negative (−) load connection to
J12 (GND)
If an ammeter is used, connect it in series with the load. Connect
the positive (+) ammeter terminal to the evaluation board for
BUCK1, J11 (VOUT1), the negative (−) ammeter terminal to
the positive (+) load terminal, and the negative (−) load
terminal to the evaluation board at J12 (GND).
INPUT AND OUTPUT VOLTMETERS
Measure the input and output voltages with voltmeters. Make
sure that the voltmeters are connected to the appropriate evaluation
board terminals and not to the load or power sources themselves.
If the voltmeters are not connected directly to the evaluation
board, the measured voltages will be incorrect due to the voltage
drop across the leads and/or connections between the evaluation
board, the power source, and/or the load.
Connect the input voltage measuring voltmeter positive terminal
(+) to the evaluation board at J1 (VIN1), and input voltage
measuring voltmeter negative (−) terminal to the evaluation
board at J2 (GND).
Connect the output voltage measuring voltmeter positive (+)
terminal to the evaluation board at P1 (VOUT1) for measuring
the output voltage of BUCK1, and the output voltage measuring
voltmeter negative (−) terminal to the evaluation board at
J12 (GND).
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POWERING UP THE EVALUATION BOARD
When the power source and load are connected to the evaluation
board, the board can be powered for operation.
EXTERNAL RESISTOR DIVIDER SETTING FOR
BUCKS AND LDOS
Before doing so, ensure that
The ADP5134 demo boards are supplied with fixed resistors
with values chosen for a target output voltage. Varying the
resistor values of the resistor divider networks varies the output
voltage accordingly.
•
The power source voltage for the bucks (VIN1, VIN2) is
>2.5 V to
