MAX8664EVKIT+ Maxim Integrated Products, MAX8664EVKIT+ Datasheet - Page 4

• Manufacturer Part Number: MAX8664EVKIT+
• Description: KIT EVAL FOR MAX8664
• Manufacturer: Maxim Integrated Products

Specifications of MAX8664EVKIT+

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 2, Non-Isolated
• Voltage - Input: 4.5 ~ 28V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: MAX8664
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Output: -
• Power - Output: -
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MAX8664 Evaluation Kit
The MAX8664 EV kit provides an option for sequencing
the outputs when using an external reference. In this
configuration, OUT1 starts first, then when OUT1 reach-
es regulation, PWRGD asserts logic-high allowing
OUT2 to start. To configure the EV kit for sequencing,
install an npn transistor in Q1, n-channel MOSFET Q2,
capacitor C24, and resistors R12, R15, R33, and R35.
The time constant R12 x C24 determines the startup
time for OUT2. See Table 2 for recommended compo-
nent values. Use the jumper settings for external refer-
ence operation (remove the shunt from JU3 and place
a shunt across pins 1-2 of JU1).
Table 2. Recommended Components for Sequenced Outputs
4
DESIGNATION
_______________________________________________________________________________________
Sequencing with an External Reference
R12, R15
C24
R33
R35
Q1
Q2
QTY
1
1
1
2
1
1
0.01µF ±10% X7R ceramic capacitor (0603)
npn transistor (SOT23)
Central Semiconductor CMPT3904
n-channel MOSFET (SOT23)
Central Semiconductor 2N7002
10kΩ ±1% resistors (0603)
0Ω resistor (0603)
47kΩ ±1% resistor (0603)
Although the MAX8664A/MAX8664B IC run from a 7.2V
to 28V or 4.5V to 5.5V supply, the MAX8664 EV kit is
optimized for operation from a 10.8V to 13.2V input
supply. Note that the EV kit uses 16V-rated input
capacitors. To evaluate circuits with a higher input,
replace these capacitors with appropriately sized
capacitors.
Options are provided on the EV kit that allow it to oper-
ate from a 4.5V to 5.5V power supply. For optimal per-
formance, external components on the EV kit should be
changed. Refer to the MAX8664 IC data sheet for the
design procedure and an example circuit that uses a
5V input. To configure the EV kit for 4.5V to 5.5V input
operation, install a 0Ω resistor in R14 and a 10Ω resis-
tor in R13. Do not allow the input voltage to exceed
5.5V in this configuration.
DESCRIPTION
Input Supply Range