MAX16050 Evaluation Kit

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Detailed Description of Hardware

The MAX16050 evaluation kit (EV kit) evaluates the 4-

channel MAX16050 and 5-channel MAX16051 power-

supply sequencing ICs. The MAX16050 EV kit monitors

up to nine DC-DC converter outputs, thus ensuring

proper power-up and power-down conditions for sys-

tems requiring voltage sequencing. During power-

down, the outputs can be reverse-sequenced by

driving SHDN low. The MAX16050 EV kit’s VCC power-

supply inputs require 2.7V to 13.2V and VPULLUP

requires 2.2V to 5.5V.

The MAX16050 EV kit can operate in DC-DC mode or in

demo mode. DC-DC mode uses the MAX16050 and

MAX16051 to control external DC-DC converters, and

without demo mode facilitates stand-alone evaluation

without external DC-DC converters.

The EV kit features RESET output signals to indicate an

undervoltage condition, or when shunts are installed

across the jumpers labeled SHDN or FAULT.

Additionally, dedicated OV_OUT outputs indicate over-

voltage faults when any of the monitored EV kit IN inputs

go above their overvoltage thresholds. The EV kit also

provides test points OUTPUT1 and OUTPUT2 for low-cur-

rent n-channel MOSFETs N1 and N2, respectively, which

are controlled by the MAX16050 and MAX16051 charge-

pump outputs. Refer to the MAX16050/MAX16051 IC

data sheet for additional information on selecting appro-

priate MOSFETs when driving external MOSFETs using

the charge-pump outputs.

Power-Supply Connections

(U1_VCC, U2_VCC, VPULLUP)

The MAX16050 EV kit requires input voltages of 2.7V to

13.2V connected at the U1_VCC and U2_VCC test

points to power the MAX16050 and MAX16051 con-

trollers, respectively. The power supplies must provide

at least 50mA of current. VPULLUP requires an input

voltage of 2.2V to 5.5V connected to the VPULLUP test

point and supplies power to the EV kit’s pullup resistor

open-drain outputs. The VPULLUP power supply must

provide at least 50mA of current. Additional surface-

mount 1206 PCB pads are provided for adding addition-

al bulk capacitance at C1, C2, and C12 for the EV kit

power-supply inputs. Header pins J3–J6 are available to

use as ground reference for signal and voltage probing.

Table 1. MAX16050/MAX16051 EV Kit Jumper Description

JUMPER

MAX16050

MAX16051

SIGNAL

SHUNT

POSITION

FUNCTION

1-2*, 2-3

Demo mode (see Figure 1)

J1

J2

EV kit operation

2-3 only

DC-DC mode (see Figure 1)

1-2

OUT_ connects to VCC through resistor

JU1

JU10

OUT_

2-3*

OUT_ connects to VPULLUP through resistor

1-2*

Controllers enabled at U1_VCC/U2_VCC > 3.2V

JU2

JU11

EN

2-3

Controllers disabled

1-2

Connects to CP_OUT through resistor

JU3

JU12

OUT3

2-3*

Connection dependent on jumpers JU1 and JU10

configuration

JU4

—

SEQ1

Not installed*

JU5

—

SEQ2

Not installed*

JU6

—

SEQ3

Not installed*

Sequence order: OUT1, OUT2, OUT3, OUT4

1-2*

Normal operation of EN and SHDN functions

JU7

JU15

EN_HOLD

2-3

Ignores high-to-low transitions at SHDN and EN

Not installed*

Controller enabled or externally driven

JU8

JU13

SHDN

Installed

Controllers disabled. Reverse power-down sequencing.

RESET asserts low.

Not installed*

Normal operation

JU9

JU14

FAULT

Installed

Disables controller. Initiates simultaneous power-down of

OUT. RESET asserts low.

*Default position (demo mode operation).