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MAX1820 Datasheet(PDF) 2 Page - Maxim Integrated Products

No. de pieza MAX1820
Descripción Electrónicos  MAX1820 Evaluation Kit
Download  6 Pages
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Fabricante Electrónico  MAXIM [Maxim Integrated Products]
Página de inicio  https://www.maximintegrated.com/en.html
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MAX1820 Datasheet(HTML) 2 Page - Maxim Integrated Products

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MAX1820 Evaluation Kit
2
_______________________________________________________________________________________
Quick Start
The MAX1820 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.
Variable Output (Top Circuit)
1) Verify that shunts are across pins 1 and 2 of
jumpers JU1 (SHDN) and JU2 (SKIP).
2) Verify that a shunt is installed on jumper JU3 (SYNC).
3) Connect a +2.7VDC to +5.5VDC power supply to the
VIN pad. Set the power supply to more than +3.6V.
Connect the supply ground to the PGND pad.
4) Connect a voltmeter to the VOUT pad.
5) Connect an external voltage reference or DAC out-
put to the reference (REF) BNC connector. The volt-
age reference or DAC must have an adjustable
range of +0.227V to +1.932V.
6) Turn on the power supply first, then the voltage ref-
erence source.
7) Set the reference voltage to +0.227V and verify that
VOUT is at +0.4V.
8) Set the reference voltage to +1.932V and verify that
VOUT is at +3.4V
+1.5V Output (Bottom Circuit)
1) Verify that shunts are across pins 1 and 2 of
jumpers JU4 (SHDN) and JU5 (SKIP).
2) Verify that a shunt is installed on jumper JU6 (SYNC).
3) Connect a +2.7VDC to +5.5VDC power supply to
the VIN pad. Connect the supply ground to the
PGND pad.
4) Connect a voltmeter to the VOUT pad.
5) Turn on the power supply and verify that VOUT is at
+1.5V.
For instructions on selecting the feedback resistors for
other output voltages, see the Evaluating Other Output
Voltages (Bottom Circuit) section.
Detailed Description
The MAX1820 EV kit contains two separate buck
switching-regulator circuits. Either circuit can be pow-
ered from a DC power supply with an input range of
+2.7V to +5.5V. PC board pads for the SHDN signal are
provided on both circuits to interface with an external
controller.
The top circuit provides a dynamically variable DC out-
put voltage in the +0.4V to +3.4V range and provides
up to 600mA as configured. A MAX1820 in a 10-pin
µMAX package is used for this circuit. To obtain up to
+3.4V at the output, +3.6V to +5.5V must be fed to the
input; 50
Ω terminated BNC connectors are provided for
the SYNC and REF signal pins that synchronize the cir-
cuit to an external sine-wave source and adjust the out-
put voltage with an external reference source, (for eval-
uating the MAX1820X and MAX1820Y) respectively.
The bottom circuit supplies a +1.5V output at up to
600mA as configured. A MAX1821 in a 10-pin µMAX
package is used for this circuit. A PC board pad is pro-
vided for the SYNC signal, which synchronizes the cir-
cuit to an external sine-wave source (for evaluating the
MAX1821X).
The MAX1820 EV kit provides two jumper-selectable
operational modes, Normal and Forced PWM. In
Normal mode, the circuit operates in Pulse Skip mode
for light loads and PWM mode for heavy loads. In
Forced PWM mode, the circuit always operates in PWM
mode for all loads.
Jumper Selection
Shutdown Mode (Top and Bottom Circuits)
The MAX1820 EV kit features a shutdown mode that
reduces the MAX1820/MAX1821 quiescent current to
0.1µA (typ), thus preserving battery life. The 3-pin
jumpers, JU1 and JU4, select the shutdown mode for
the MAX1820 EV kit. Table 1 lists the selectable jumper
options.
SHUNT
LOCATION
SHDN PIN
MAX1820/MAX1821
OUTPUT
1, 2
Connected to VIN
MAX1820, MAX1821
enabled
2, 3
Connected to
GND
Shutdown mode,
disabled
None
External controller
connected to
SHDN pad
Logic high = enabled
Logic low = disabled
Table 1. Jumpers JU1 and JU4 Functions


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