Datasheet

SHUNT POSITION EN PIN SMPS REGULATORS
1-2* Connected to IN
V
ELVDD
= +4.6V
V
ELVSS
= -4.9V
2-3 Connected to AGND
V
ELVDD
= 0V
V
ELVSS
= 0V
Not installed
External pulses must be applied to the
EN test pad
V
ELVDD
= +4.6V
V
ELVSS
= -5.4V to -1.5V (based on EN pulses)
_________________________________________________________________ Maxim Integrated Products 2
MAX17116 Evaluation Kit
Evaluates: MAX17116 in a 12-Pin UTDFN Package
Quick Start
Recommended Equipment
• MAX17116 EV kit
• +2.3V to +4.2V, 1A power supply (VIN)
• Two digital voltmeters
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation. Caution: Do not turn on
the power supply until all connections are completed.
1) Verify that jumper JU1 is in the default position, as
shown in Table 1.
2) Connect the positive terminal of the power supply
to the VIN PCB pad and the negative terminal to the
nearest PGND PCB pad.
3) Connect the first voltmeter across the ELVDD PCB
pad and the nearest PGND PCB pad.
4) Connect the second voltmeter across the ELVSS PCB
pad and the nearest PGND PCB pad.
5) Turn on the DC power supply.
6) Verify that the voltmeters display V
ELVDD
= +4.6V and
V
ELVSS
= -4.9V.
Detailed Description of Hardware
The MAX17116 EV kit includes two current-mode
1.4MHz SMPS regulators for AMOLED displays. The
positive supply is provided by a step-up regulator with a
synchronous rectifier. The negative supply is provided
by an inverting regulator with a synchronous rectifier.
The step-up regulator output is a fixed voltage of +4.6V
and the inverting regulator output is adjustable from -5.4V
to -1.5V through the single-wire EN serial interface. The EV
kit operates from a +2.3V to +4.2V single power supply.
Step-Up Regulator
The EV kit includes a step-up DC-DC converter with an
integrated power MOSFET switch and synchronous
rectifier. The step-up regulator output (ELVDD) has a
fixed voltage of +4.6V and can provide an output current
of 250mA.
Inverting Converter
The EV kit contains an inverting DC-DC converter with
integrated power MOSFET switch and synchronous recti-
fier. The inverting regulator output (ELVSS) is adjustable
from -5.4V to -1.5V and can provide an output current
of 250mA. The ELVSS output voltage can be adjusted
through the single-wire EN serial interface.
Enable Input and Serial Interface Input
The EV kit features a 3-pin jumper (JU1) to control the
enable input and an EN test pad to access the serial inter-
face input. Connect EN to IN for normal operation. Connect
EN to AGND to place the device into shutdown mode.
The enable pin is also used as a serial-interface input
to adjust the inverting converter output voltage. With no
shunts installed on jumper JU1, connect an external pulse
generator at the EN test pad and send the required serial
pulses. Refer to the EN Serial Interface section in the
MAX17116 IC data sheet for a more detailed description.
Table 1 lists the selectable jumper options.
Table 1. Jumper JU1 Function
*Default position.