MAX1685EVKIT Maxim Integrated, MAX1685EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX1685EVKIT
• Description: Power Management IC Development Tools Evaluation Kit for the MAX1684 MAX1685
• Manufacturer: Maxim Integrated
• Series: MAX1684, MAX1685r

Specifications of MAX1685EVKIT

• Output Voltage: 3.3 V
• Output Current: 1 A

The EV kit operates at 600kHz switching frequency and
allows the use of a tiny inductor. The switching frequen-
cy can also be synchronized to an external clock rang-
ing from 360kHz to 700kHz. The 2-pin headers JU2 and
JU3 select the operating mode (Tables 2 and 3).
The EV kit output is preset to +3.33V. However, the out-
put voltage can also be adjusted between 1.25V and
V
resistor R2 in the 20k
given by:
where V
the pads of R2 before installing the resistor. Install a
Table 2. Jumper JU2 Functions
(not installed)
IN
LOCATION
SHUNT
by selecting R1 and R2 values. Select feedback
On
Off
FB
R1 = R2 [(V
= 1.25V. Be sure to cut the PC trace shorting
Evaluating Other Output Voltages
Connected to GND
Driven from
external clock
Connected to VL
SYNC/PWM PIN
_______________________________________________________________________________________
OUT
to 100k
/ V
FB
) - 1]
MAX1685 operates in
fixed-frequency mode.
MAX1685 operates in
normal mode.
SYNC/PWM pin is
driven by an external
clock between 360kHz
and 700kHz.
OPERATING MODE
range. R1 is then
MAX1685 Evaluation Kit
4.7pF capacitor at location C8. For output voltages
greater than +5.5V, cut the trace between pins 1 and 2
of JU4, and short pins 2 and 3 of JU4. Refer to the
Detailed Description section of the MAX1684/
MAX1685 data sheet for further details.
This EV kit can also be used to evaluate the MAX1684.
Simply replace the MAX1685 with a MAX1684EEE, and
change L1 to a 22µH, 1.7A inductor. Refer to the
Inductor Selection section of the MAX1684/MAX1685
data sheet for more information.
Table 3. Jumper JU3 Functions
(not installed)
LOCATION
SHUNT
On
Off
Connected to GND
Connected to VL
STBY PIN
Evaluating the MAX1684
Operation depends on
the JU2 setting.
MAX1685 operates in
low-power mode. This
overrides the JU2
setting.
OPERATING MODE
3