19-2976; Rev 0; 9/03
MAX1960 Evaluation Kit
General Description
The MAX1960 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that evaluates
the MAX1960 family of PWM synchronous step-down
controllers. There are two circuits on the board. The first
has the MAX1960 installed but can also be used to
evaluate the MAX1961. This circuit provides a 1.8V out-
put at up to 15A, or the output can be adjusted from
0.8V to (0.9
✕
V
IN
). The second circuit evaluates the
MAX1962. Components for the second circuit are not
installed on the standard evaluation kit. Both circuits
can operate with a 2.35V to 5.5V input voltage.
Features
o
2.35V to 5.5V Input Supply Range
o
1.8V Output at Up to 15A
o
Output Voltage Adjustable Down to 0.8V
o
Fixed-Frequency PWM Operation
o
Selectable 500kHz/1MHz or External
Synchronization
o
±4% Voltage Margining
Evaluates: MAX1960/MAX1961/MAX1962
Ordering Information
PART
MAX1960EVKIT
TEMP RANGE
0°C to +70°C
IC PACKAGE
20 QSOP
Component List
DESIGNATION QTY
C1
1
DESCRIPTION
0.47µF ±10%, 10V X5R ceramic
capacitor (0603)
TDK C1608X5R1A474K or equivalent
Not installed; 0.47µF ±10%, 10V X5R
ceramic capacitors (0603)
TDK C1608X5R1A474K or equivalent
(tripler)
1µF ±20%, 6.3V X5R ceramic
capacitor (0402)
Panasonic ECJ0EB0J105M or
equivalent
0.1µF ±10%, 10V X5R ceramic
capacitor (0402)
TDK C1005X5R1A104K or equivalent
2.2µF ±10%, 6.3V X5R ceramic
capacitor (0603)
TDK C1608X5R0J225K or equivalent
10µF ±20%, 6.3V X5R ceramic
capacitors (0805)
Panasonic ECJ2FB0J106M or
equivalent
0.22µF ±10%, 6.3V X5R ceramic
capacitors (0402)
TDK C1005X5R0J224K or equivalent
Not installed, 10pF ceramic capacitor
(0402)
0.01µF ±10%, 25V X7R ceramic
capacitor (0402)
Murata GRP155R71E103K or
equivalent
DESIGNATION QTY
C14, C15
2
DESCRIPTION
680µF, 2.5V, 8mΩ POSCAPs
Sanyo 2R5TPD680M8
4700pF ±10%, 50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H472K or equivalent
470µF, 6.3V POSCAP
Sanyo 6TPB470M
Single Schottky diode (SOT-323)
Central CMSSH-3
Not installed, Schottky diodes
(SOD-123)
Central CMHSH5-2L (tripler)
3-pin headers
4-pin 3-way header
0.22µH inductor
Sumida CDEP105(S)-0R2NC-50
N-channel MOSFET (D-Pak)
IRF IRLR7821
N-channel MOSFET (D-Pak)
IRF IRLR7833
301kΩ ±1% resistor (0603)
6.8kΩ ±5% resistor (0603)
12.4kΩ ±1% resistor (0603)
10kΩ ±1% resistor (0603)
10Ω ±5% resistor (0603)
1Ω ±5% resistors (0603)
Maxim MAX1960EEP (20-pin QSOP)
Shunts, two position
MAX1960EVKIT PC board
C16, C17
2
C2, C3, C13
0
C37
D1
1
1
C4
1
D2–D5
JU1, JU2, JU3
JU4
L1
N1
N2
R1
R2
R3
R4
R5
R12, R13
U1
None
None
0
3
1
1
1
1
1
1
1
1
1
2
1
4
1
C5
1
C6
1
C7, C8, C9
3
C10, C38
2
C11
1
C12
1
________________________________________________________________
Maxim Integrated Products
1
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.
MAX1960 Evaluation Kit
Evaluates: MAX1960/MAX1961/MAX1962
The following components are for the optional MAX1962 circuit and are not installed:
DESIGNATION QTY
C18, C19
2
DESCRIPTION
680µF, 2.5V, 8mΩ POSCAPs
Sanyo 2R5TPD680M8 or equivalent
4700pF ±10%, 50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H472K or equivalent
Not installed; 1µF ±10%, 16V X5R
ceramic capacitors (0603)
Panasonic ECJ1VB1C105K or
equivalent (tripler)
6800pF ±10%, 25V X7R ceramic
capacitor (0402)
Murata GRP155R71E682K or
equivalent
Not installed, 10pF ceramic capacitor
(0402)
0.22µF ±10%, 6.3V X5R ceramic
capacitors (0402)
TDK C1005X5R0J224K or equivalent
10µF ±20%, 6.3V X5R ceramic
capacitors (0805)
Panasonic ECJ2FB0J106M or
equivalent
4.7µF ±10%, 6.3V X5R ceramic
capacitor (0603)
Panasonic ECJ1VB0J475K or
equivalent
0.1µF ±10%, 10V X5R ceramic
capacitor (0402)
TDK C1005X5R1A104K or equivalent
1µF ±20%, 6.3V X5R ceramic
capacitor (0402)
Panasonic ECJ0EB0J105M or
equivalent
1µF ±10%, 16V X5R ceramic
capacitor (0603)
Panasonic ECJ1VB1C105K or
equivalent
470µF, 6.3V POSCAP
Sanyo 6TPB470M
DESIGNATION QTY
C36
D6
1
1
DESCRIPTION
Not installed (0805)
Single Schottky diode (SOT-323)
Central CMSSH-3
Not installed, Schottky diodes
(SOD-123)
Central CMHSH5-2L (tripler)
4-pin 3-way header
3-pin headers
2-pin header
0.45µH inductor
Sumida CDEP105(S)-0R4MC-50
N-channel MOSFET (D-Pak)
IRF IRLR7821
N-channel MOSFET (D-Pak)
IRF IRLR7833
10kΩ ±1% resistor (0603)
12.4kΩ ±1% resistor (0603)
20kΩ ±5% resistor (0603)
1.5mΩ ±5%, 1W resistor (2512)
Panasonic ERJM1WTJ1M5U
10Ω ±5% resistor (0603)
Not installed (0603)
1Ω ±5% resistors (0603)
MAX1962EEP (20-pin QSOP)
Shunts
C20, C21
2
D7–D10
JU5
JU6, JU7
JU8
L2
N3
N4
R6
R7
R8
R9
R10
R11
R14, R15
U2
None
4
1
2
1
1
1
1
1
1
1
1
1
1
2
1
3
C22, C32, C33
0
C23
1
C24
1
C25, C39
2
C26, C27, C28
3
C29
1
C30
1
C31
1
Component Suppliers
SUPPLIER
Central
Semiconductor
International
Rectifier
Kamaya
Murata
Panasonic
Sanyo
Sumida
TDK
PHONE
631-435-1110
310-322-3331
260-489-1533
814-237-1431
714-373-7939
619-661-6835
847-545-6700
847-803-6100
WEBSITE
www.centralsemi.com
www.irf.com
www.kamaya.com
www.murata.com
www.panasonic.com
www.sanyo.com
www.sumida.com
www.component.tdk.com
C34
1
C35
1
Note:
Please specify that you are using the MAX1960/
MAX1961/MAX1962 when contacting these suppliers.
2
_______________________________________________________________________________________
MAX1960 Evaluation Kit
Quick Start
The MAX1960 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:
1) Verify jumpers JU1, JU2, and JU3 are shorted
between pins 2 and 3.
2) Preset input power supply to between 2.7V and
5.5V. Turn power supply off.
3) Connect the positive power-supply lead to the IN1
pad on the EV kit. Connect the supply ground to the
PGND1 pad on the EV kit.
4) Connect a voltmeter and load from OUT1 to PGND1
on the EV kit.
5) Turn on the power supply.
6) Verify that the voltage at OUT1 is +1.8V ±1.5%.
Evaluates: MAX1960/MAX1961/MAX1962
Table 5. JU8 Functions
JUMPER POSITION
1-2
Not connected
OUT2 VOLTAGE
Selected with JU5
Adjustable—set with resistors
R6 and R7
Table 6. JU9 and JU11 Functions
JUMPER PADS
Open
Short
CHARGE PUMP
2x (normal)
3x (tripler)
Table 7. JU10 Functions
(MAX1960/MAX1961)
JUMPER PADS
Open
FUNCTION
JU1 and JU2 function as
shown in Table 1
CTL1 and CTL2
connected—use only one
jumper on JU1 or JU2 for
shutdown/enable
Jumper Selection
Table 1. JU1 and JU2 Functions
(MAX1960/MAX1961)
JU1 POSITION
1-2
1-2
2-3
2-3
JU2 POSITION
1-2
2-3
1-2
2-3
OUT1 FUNCTION
Shutdown
-4% margining
+4% margining
Enable (normal operation)
Short
Table 8. JU12 Functions (MAX1962)
JUMPER PADS
Open
Short
FUNCTION
Uses inductor resistance for
current sensing
Uses current-sense resistor
Table 2. JU3 and JU6 Functions
JUMPER POSITION
1-2
2-3
Not connected
OPERATING FREQUENCY
500kHz
1MHz
Clock applied to SYNC_ input
Detailed Description
Evaluating the MAX1961 or MAX1962
The MAX1960 EV kit comes with the MAX1960
installed, but can also be used to evaluate the
MAX1961 and the MAX1962. Free samples of these
parts can be obtained from Maxim.
To evaluate the MAX1961, first carefully remove U1
from the PC board and replace it with the MAX1961.
Next, remove feedback resistors R3 and R4. Finally,
short the pads of R3. The evaluation kit is now config-
ured for the MAX1961.
To evaluate the MAX1962, a second circuit is provided
on the PC board. Components for this circuit do not
come installed on the standard evaluation kit board. To
configure the board for the MAX1962, install the com-
ponents recommended in the
Component List
section.
Table 3. JU4 and JU5 Functions
(MAX1961/MAX1962)
JUMPER POSITION
1-2
1-3
1-4
Not connected
OUTPUT VOLTAGE
+1.5V
+1.8V
+3.3V
+2.5V
Table 4. JU7 Functions (MAX1962)
JUMPER POSITION
1-2
2-3
OUT2 FUNCTION
Shutdown
Enable
_______________________________________________________________________________________
3
MAX1960 Evaluation Kit
Evaluates: MAX1960/MAX1961/MAX1962
Setting the Output Voltage
(MAX1960/MAX1962)
The MAX1960 uses a pair of feedback resistors to set
the output voltage, which is fixed at +1.8V from the fac-
tory. The output voltage of the MAX1962 can also be
set with feedback resistors, or can use its preset output
voltages like the MAX1961 (see the
Selecting a Preset
Output Voltage
section).
To change the output voltage on the MAX1960 circuit,
first verify that a 10kΩ resistor is installed in R4. Then
calculate a resistor value for R3:
V
R3
=
R4
×
OUT
−
1
0
.
8
To set the output voltage on the MAX1962 circuit, first
remove jumper JU8. Then, install a 10kΩ resistor in R6.
Finally, calculate a resistor value for R7:
V
R7
=
R6
×
OUT
−
1
0
.
8
When changing the output-voltage setting, refer to the
MAX1960/MAX1961/MAX1962 data sheet for selecting
compensation components, output inductor, and output
capacitor for best performance.
When selecting different output voltages, refer to the
MAX1960/MAX1961/MAX1962 data sheet for selecting
compensation components, output inductor, and output
capacitor for best performance.
Evaluating at Low Input Voltages
(Tripler Configuration)
In the default configuration, the EV kit works at input
voltages from +2.7V to +5.5V. To work with input volt-
ages below +2.7V, configure the charge pump as a
tripler. When using the tripler, the input voltage range is
+2.35V to +3.6V.
To configure the charge pump as a tripler, use the
following procedure:
For the MAX1960/MAX1961 circuit:
1) Remove C1.
2) Add C2, C3, and C13 (see the
Component List).
3) Add D2–D5 (see the
Component List).
4) Short the pads of JU9.
For the MAX1962 circuit:
1) Remove C34.
2) Add C22, C32, and C33 (see the
Component List).
3) Add D7–D10 (see the
Component List).
4) Short the pads of JU11.
Selecting a Preset Output Voltage
(MAX1961/MAX1962)
First, follow the procedure given under the
Evaluating
the MAX1961 or MAX1962
section to set up the EV kit
for using the MAX1961 or MAX1962. To select a preset
output voltage with the MAX1962, short the pins of
jumper JU8, remove resistors R6 and R7, and use JU5
to select the output voltage (Table 3). For the MAX1961,
use JU4 to select the output voltage (Table 3).
Changing the Switching Frequency
JU3 and JU6 select between 500kHz and 1MHz opera-
tion. To optimize performance, it is also necessary to
change the value of some of the components. The
components for 1MHz operation come installed on the
PC board (MAX1960/MAX1961 circuit), and are listed in
the
Component List
table. For 500kHz operation,
change the components listed in Table 9, and refer to
the MAX1960/MAX1961/MAX1962 data sheet for select-
ing compensation components. The MAX1962 circuit
component list is configured for 500kHz operation.
Table 9. Component Changes for 500kHz Operation
DESIGNATION
(MAX1960/MAX1961)
C1
C2, C3, C13
C6
L1
QTY
1
3
1
1
DESCRIPTION
1µF ±10%, 16V X5R ceramic capacitor (0603), Panasonic ECJ1VB1C105K
1µF ±10%, 16V X5R ceramic capacitors (0603), Panasonic ECJ1VB1C105K
4.7µF ±10%, 6.3V X5R ceramic capacitor (0603), Panasonic ECJ1VB0J475K
0.45µH inductor, Sumida CDEP105(S)-0R4MC-50
NOTES
Without tripler
With tripler
—
—
4
_______________________________________________________________________________________
MAX1960 Evaluation Kit
Using SYNC and CLKOUT
To synchronize the converter to an external clock,
connect the clock signal (450kHz to 1.1MHz) to SYNC_.
A clock output (CLKOUT_) is provided on the EV kit.
CLKOUT_ functions both when the converter is switch-
ing at its preset frequency and when a SYNC signal is
applied. The CLKOUT_ waveform is 180° out-of-phase
with the converter’s clock, allowing a second converter
to operate out-of-phase with the first by connecting
CLKOUT_ of the first converter to SYNC_ of the second
converter.
Evaluating Shutdown
Shutdown mode turns off the IC, reducing the input
current to below 10µA. For the MAX1960/MAX1961,
JU1 and JU2 control the shutdown feature (Table 1).
On the MAX1962, JU7 controls shutdown (Table 4).
If voltage margining is not used on the MAX1960/
MAX1961, then the pads of JU10 can be connected
together to allow shutdown/enable using a single jumper.
If this is done, either JU1 or JU2 must be completely
removed and the other used to control shutdown/enable.
Connecting both jumpers can cause an input supply to
ground short, which could damage the EV kit.
Evaluates: MAX1960/MAX1961/MAX1962
Evaluating Voltage Margining
(MAX1960/MAX1961)
A voltage-margining feature is provided on the
MAX1960 and MAX1961. This allows the output to be
shifted up or down by 4%. Voltage margining is
controlled by JU1 and JU2 (Table
1).
_______________________________________________________________________________________
5
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