MAX16050EVKIT_技术文档

19-4199; Rev 0; 7/08

MAX16050 Evaluation Kit

Evluates:/MAX6051

General Description

Features

The MAX16050 evaluation kit (EV kit) is a complete, fully

assembled and tested multivoltage sequencer circuit that

demonstrates the capability of the 4-channel MAX16050

and 5-channel MAX16051 sequencing ICs. The

MAX16050 EV kit monitors up to nine DC-DC converter

outputs and ensures proper power-up and power-down

conditions for systems requiring voltage sequencing.

♦ Quick Demo Mode Evaluation Without DC-DC

Converters

♦ Monitors and Sequences Up to Nine DC-DC

Converter Outputs

♦ Reverse-Sequencing Operation

♦ Configurable Sequencing Order (MAX16050 Only)

The EV kit features RESET output signals to indicate an

undervoltage condition, or when SHDN or FAULT sig-

nals are pulled low. Additionally, dedicated OV_OUT

outputs indicate an overvoltage fault when any of the

EV kit’s inputs go above the overvoltage threshold. The

EV kit is capable of evaluating the MAX16050 and

MAX16051 individually. The EV kit can be configured

for daisy chaining these two devices together, which

enables the user to sequence and monitor up to nine

voltages across both devices. The MAX16050 EV kit

also provides PCB pads for low-current MOSFETs that

are controlled using the MAX16050 and MAX16051

charge-pump outputs.

♦ Daisy-Chaining Operation of the MAX16050 and

MAX16051

♦ Overvoltage and Power-Good Monitoring

♦ Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX16050EVKIT+

EV Kit

+Denotes lead-free and RoHS compliant.

The MAX16050 EV kit utilizes two power supplies, one

for each IC. Each power supply can range from 2.7V to

13.2V, allowing the user to operate directly from an

intermediate bus voltage. The MAX16050 EV kit also

requires an additional 2.2V to 5.5V power supply for the

pullup resistors’ open-drain logic outputs.

Component List

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

Not installed, ceramic capacitors

(1206)

2200pF 5ꢀ, 50V C0G ceramic

capacitors (0805)

C1, C2, C12

0

C11, C21

2

Murata GRM2165C1H222J

Not installed, ceramic capacitors

(0805)

C3, C13

C4, C15

0

2

GND (3)

GND (2)

J1

3

2

1

4

PC large black test points

PC mini black test points

2 x 16 header

0.1μF 10ꢀ, 25V X7R ceramic

capacitors (0805)

Murata GRM21BR71E104K

J2

2 x 20 header

J3–J6

2-pin headers

1μF 10ꢀ, 25V X7R ceramic

capacitors (0805)

Murata GRM21BR71E105K

JU1–JU7, JU10,

JU11, JU12, JU15

C5, C14

2

9

2

11 3-pin headers

JU8, JU9, JU13,

JU14

0.01μF 10ꢀ, 25V X7R ceramic

capacitors (0805)

Murata GRM21BR71E103K

4

0

2-pin headers

C6–C9, C16-C19,

C22

Not installed, n-channel

MOSFETs (3 SOT23)

N1, N2

1200pF 5ꢀ, 50V C0G ceramic

capacitors (0805)

Murata GRM2195C1H122J

C10, C20

________________________________________________________________ Maxim Integrated Products

1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

MAX16050 Evaluation Kit

Component List (continued)

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

20.5kΩ 1ꢀ resistor (0805)

4-position DIP switch

OUTPUT1,

OUTPUT2,

U1_CP_OUT,

U1_EN,

R35

SW1

SW2

1

10-position DIP switch

U1_VCC, U2_VCC,

VPULLUP

U1_OV_OUT,

U1_REM,

U1_RESET,

U2_CP_OUT,

U2_EN,

U2_OV_OUT,

U2_REM,

U2_RESET

3

PC large red test points

12 PC mini red test points

4-channel voltage sequencer

(28 TQFN-EP*)

Maxim MAX16050ETI+

U1

U2

1

5-channel voltage sequencer

(28 TQFN-EP*)

1

Maxim MAX16051ETI+

R1, R12, R20, R32

4

9

86.6kΩ 1ꢀ resistors (0805)

16.5kΩ 1ꢀ resistors (0805)

—

32 Shunts (J1, J2, JU1–JU15)

PCB: MAX16050 Evaluation Kit+

R2, R4, R10, R13,

R22, R24, R30,

R33, R36

—

1

*EP = Exposed pad.

R3, R23

2

7

30.1kΩ 1ꢀ resistors (0805)

10kΩ 1ꢀ resistors (0805)

R5, R11, R14, R25,

R31, R34, R37

Component Suppliers

SUPPLIER

PHONE

WEBSITE

R6, R26

R7, R27

R8, R28

R9, R29

2

634kΩ 1ꢀ resistors (0805)

261kΩ 1ꢀ resistors (0805)

698kΩ 1ꢀ resistors (0805)

61.9kΩ 1ꢀ resistors (0805)

Murata

Electronics

North

770-436-1300 www.murata-northamerica.com

America, Inc.

Not installed, resistors—short

(0805)

Note: Indicate that you are using the MAX16050 or MAX16051

when contacting these component suppliers.

R15, R21

0

8

R16–R19,

R38–R41

Evluates:/MAX6051

10kΩ 5ꢀ resistor (0805)

3) Connect the positive terminal of the 3.5V power

supply to the U1_VCC and U2_VCC test points.

Connect the ground terminal of this power supply to

the respective GND test points.

Quick Start

Required Equipment

Before beginning, the following equipment is needed:

4) Connect the positive terminal of a 5V power supply

to the VPULLUP test point. Connect the ground ter-

minal of this power supply to the GND test point.

•

MAX16050 EV kit

DC power supplies: 3.5V/100mA, 5V/50mA

2-channel oscilloscope

5) Connect oscilloscope channels 1 and 2 to the

U1_RESET and U2_RESET test points, respectively.

Connect the ground leads to the nearby black GND

test points.

Procedure

The MAX16050 EV kit is a fully assembled and tested

surface-mount board. Follow the steps below to verify

board operation. Caution: Do not turn on the power

supplies until all connections are completed.

6) Turn on the VCC power supply and adjust the volt-

age to 3.5V.

7) Turn on the VPULLUP power supply and adjust the

voltage to 5V.

1) Verify that headers J1 and J2 and jumpers

JU1–JU14 are configured for demo mode configu-

ration (see Table 1).

8) Verify that both U1_RESET and U2_RESET signals

are high.

2) Verify that switches SW1 and SW2 are set to the off

position.

9) The EV kit is ready for further testing.

2

_______________________________________________________________________________________

MAX16050 Evaluation Kit

Evluates:/MAX6051

Table 1. MAX16050/MAX16051 EV Kit Jumper Description

JUMPER

SHUNT

POSITION

SIGNAL

EV kit operation

OUT_

FUNCTION

MAX16050

MAX16051

1-2*, 2-3

2-3 only

1-2

Demo mode (see Figure 1)

J1

J2

DC-DC mode (see Figure 1)

OUT_ connects to VCC through resistor

OUT_ connects to VPULLUP through resistor

Controllers enabled at U1_VCC/U2_VCC > 3.2V

Controllers disabled

JU1

JU2

JU10

JU11

2-3*

1-2*

EN

2-3

1-2

Connects to CP_OUT through resistor

JU3

JU12

OUT3

Connection dependent on jumpers JU1 and JU10

configuration

2-3*

JU4

JU5

JU6

—

SEQ1

SEQ2

SEQ3

Not installed*

Not installed* Sequence order: OUT1, OUT2, OUT3, OUT4

Not installed*

1-2*

2-3

Normal operation of EN and SHDN functions

Ignores high-to-low transitions at SHDN and EN

JU7

JU15

EN_HOLD

Not installed* Controller enabled or externally driven

Controllers disabled. Reverse power-down sequencing.

RESET asserts low.

Not installed* Normal operation

Disables controller. Initiates simultaneous power-down of

JU8

JU13

SHDN

Installed

JU9

JU14

FAULT

Installed

OUT. RESET asserts low.

*Default position (demo mode operation).

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.

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.

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.

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

_______________________________________________________________________________________

3

MAX16050 Evaluation Kit

DC-DC Mode

For DC-DC mode operation, connect the DC-DC con-

verter outputs and EN/SHDN inputs to the EV kit’s IN_

and OUT_ header pins, respectively, and place shunts

across pins 2-3 of headers J1 and J2. Header J1 drives

the U1_IN1–U1_IN4 MAX16050 inputs and header J2

drives the U2_IN1–U2_IN5 MAX16051 inputs. See

Table 1 and Figure 1 for headers J1 and J2 configura-

tion for DC-DC and demo modes of operation. By

default, the input-voltage thresholds are set according

to Table 2.

Table 2. Input Channel Threshold Voltages

INPUT

THRESHOLD

VOLTAGE (V)

INPUT CHANNEL

RESISTORS

U1_IN1, U2_IN1

U1_IN2, U2_IN2

U1_IN3, U2_IN3

U1_IN4, U2_IN4

U2_IN5

3.13

2.28

1.71

1.43

1.14

R12/R13, R32/R33

R9/R10, R29/R30

R6/R7, R26/R27

R3/R4, R23/R24

R35/R36

The sequence delay between each of the OUT_ outputs

is the time required for the external converter voltage to

exceed the undervoltage threshold, the respective

channel open-drain output OUT_ going high imped-

ance, and the additional time delay set by external delay

capacitors C10 and C20. As each IN_ voltage meets its

respective threshold, the next OUT_ in the sequence

goes high impedance (open-drain output), enabling the

next power supply, which is then monitored by the next

input stage. When all the voltages exceed their respec-

tive thresholds, RESET goes high after the reset timeout

period set by capacitors C11 and C21.

Demo Mode

The MAX16050 EV kit allows quick evaluation of the

MAX16050 and MAX16051 ICs individually without inter-

facing DC-DC converters to the kit’s IN and OUT header

pins. Place shunts across pins 1-2 and pins 2-3 of head-

ers J1 and J2 to operate the MAX16050 EV kit in demo

mode. In demo mode, VCC or VPULLUP powers the

inputs to the respective IN_ channels with the OUT_

pullup voltage. Demo mode operation requires a mini-

mum 3.5V applied at the VCC or VPULLUP PCB input

pads. See Table 1 and Figure 1 for proper shunt place-

ment when operating the MAX16050 EV kit in demo

mode. Note that when operating the MAX16050 EV kit in

demo mode, both OV_OUT signals will be asserted low.

To daisy chain the MAX16050 and MAX16051 while

operating the EV kit in demo mode, See the Configuring

the MAX16050 EV Kit for Daisy-Chain Operation (SW1)

section.

Input Channel Threshold Voltages (IN_)

The EV kit input-voltage thresholds are set to operate

with 3.3V, 2.5V, 1.8V, 1.5V, and 1.2V (MAX16051) volt-

age systems. All input-voltage thresholds can be recon-

figured by replacing the corresponding resistors, as

shown in Table 2. Refer to the Resistor Value Selection

section in the MAX16050/MAX16051 IC data sheet to

calculate the new resistor values when reconfiguring

the EV kit input thresholds.

Evluates:/MAX6051

OUT_ Pullup Voltage Selection (JU1, JU10)

Jumpers JU1 and JU10 select the OUT_ open-drain

pullup voltage. Place a shunt across pins 1-2 of

jumpers JU1 and JU10 to select the respective power-

supply inputs (U1_VCC, U2_VCC) as the OUT_ logic-

high voltage. Place shunts across pins 2-3 of jumpers

JU1 and JU10 to select VPULLUP as the OUT_ logic-

high voltage. See Table 3 for proper jumper settings for

OUT_’s logic-high voltage configuration.

Figure 1. Headers J1/J2 Shunt Configurations for DC-DC and

Demo Mode Operation

4

_______________________________________________________________________________________

MAX16050 Evaluation Kit

Evluates:/MAX6051

Caution: When operating the MAX16050 EV kit

U1_VCC or U2_VCC inputs with power supplies greater

than 5.5V, verify that shunts are installed across pins 2-3

of jumpers JU1 and JU10 to prevent operating the open-

drain logic outputs above the maximum voltage rating.

where V

is the desired VCC undervoltage threshold,

EN

0.5V is the MAX16050/MAX16051 EN threshold voltage,

and R is the new resistor value for R1 or R20 in kilohms.

A

Charge-Pump Outputs (CP_OUT)

The EV kit features test points (U1_CP_OUT,

U2_CP_OUT) to monitor the MAX16050 and MAX16051

charge-pump outputs. PCB pads are also available for

the installation of low-current SOT23 footprint n-channel

MOSFETs at N1 and N2.

Table 3. Jumpers JU1, JU10 Configuration

SHUNT

POSITION

OUT_ PULLUP RESISTOR VOLTAGE

SOURCE

1-2

2-3

OUT_ connects to VCC through resistor

The EV kit’s charge-pump outputs can also be used as

the pullup voltages for open-drain output OUT3 using

jumpers JU3 and JU12. See Table 5 for configuring

OUT3 to the respective charge-pump outputs.

OUT_ connects to VPULLUP through resistor

EN Control (JU2, JU11)

Jumpers JU2 and JU11 enable or disable the MAX16050

and MAX16051, respectively, for power-up sequencing

and simultaneous power-down operation. Install shunts

across pins 1-2 of jumpers JU2 and JU11 to initiate a

power-up sequence. Install a shunt across pins 2-3 to

power down the channels and to assert RESET. See

Table 4 for jumpers JU2 and JU11 configuration.

Table 5. Jumpers JU3, JU12 Configuration

SHUNT

OUT3 PULLUP VOLTAGE

POSITION

1-2

2-3

Connects to CP_OUT through resistor

Connection dependent on jumpers JU1/JU10

configuration (see Table 3)

Table 4. Jumpers JU2, JU11 Configuration

MAX16050 Sequence Order

(JU4, JU5, JU6)

SHUNT

EN INPUT SETTING

POSITION

Jumpers JU4, JU5, and JU6 configure the MAX16050

sequencing order. The jumper settings allow up to 24

different power-up combinations. The MAX16051 does

not feature programmable power-supply sequencing

and powers up in a fixed order from U2_OUT1–U2_

OUT5. See Table 6 to configure the sequencing order

for U1_OUT1–U1_OUT4.

EN connected to resistor-divider (controllers

enabled)

1-2

2-3

EN = GND (controllers disabled)

The voltage threshold of each analog EN input is config-

ured to 3.17V using resistors R1/R2 (U1) and R20/R22

(U2). Use the following equation to calculate a new R1 or

R20 resistor value to change the enable threshold:

V

0.5V

⎛

⎞

⎠

EN

R

= 16.5 x

− 1

A

⎜

⎝

⎟

Table 6. MAX16050 Sequencing Control (JU4, JU5, JU6)

SHUNT POSITION

SEQUENCE ORDER

JU4

JU5

JU6

1ST

2ND

3RD

4TH

Not installed

U1_OUT1

U1_OUT2

U1_OUT3

U1_OUT4

U1_OUT1

U1_OUT3

U1_OUT4

U1_OUT2

U1_OUT4

U1_OUT2

U1_OUT3

U1_OUT4

U1_OUT1

U1_OUT4

U1_OUT3

U1_OUT4

U1_OUT2

U1_OUT3

U1_OUT2

U1_OUT4

U1_OUT3

U1_OUT4

Not installed

2-3

Not installed

1-2

Not installed

2-3

1-2

Not installed

2-3

1-2

_______________________________________________________________________________________

5

MAX16050 Evaluation Kit

Table 6. MAX16050 Sequencing Control (JU4, JU5, JU6) (continued)

SHUNT POSITION

SEQUENCE ORDER

JU4

2-3

1-2

JU5

Not installed

2-3

JU6

1ST

2ND

3RD

4TH

Not installed

U1_OUT2

U1_OUT3

U1_OUT4

U1_OUT3

U1_OUT4

U1_OUT1

U1_OUT2

U1_OUT4

U1_OUT1

U1_OUT2

U1_OUT3

U1_OUT4

U1_OUT1

U1_OUT3

U1_OUT2

U1_OUT4

U1_OUT1

U1_OUT4

U1_OUT1

U1_OUT2

U1_OUT3

U1_OUT1

U1_OUT3

U1_OUT1

U1_OUT2

U1_OUT1

U1_OUT3

U1_OUT1

U1_OUT4

U1_OUT2

U1_OUT4

U1_OUT1

U1_OUT2

U1_OUT1

U1_OUT3

U1_OUT2

U1_OUT3

U1_OUT1

U1_OUT2

U1_OUT1

2-3

1-2

Not installed

2-3

1-2

Not installed

1-2

2-3

1-2

Not installed

2-3

Not installed

2-3

1-2

Not installed

2-3

1-2

level at pin 1 of jumpers JU8 or JU14. Connect the sig-

nal ground to a convenient ground reference. See

Table 9 for jumpers JU9 and JU14 configuration.

EN_HOLD (JU7, JU15)

Jumpers JU7 and JU15 configuration setting allows the

MAX16050 and MAX16051 to ignore high-to-low transi-

tions at the EN and SHDN inputs. Place a shunt across

pins 1-2 for normal operation of the EN and SHDN fea-

ture. Place a shunt across pins 2-3 to ignore high-to-low

transitions at EN and SHDN. See Table 7 for jumpers

JU7 and JU15 configuration.

Table 7. Jumpers JU7, JU15 Configuration

SHUNT

EN_HOLD INPUT SETTING

POSITION

1-2

2-3

Normal operation of EN and SHDN functions

Ignores high-to-low transitions at EN and SHDN

Evluates:/MAX6051

SHDN Control (JU8, JU13)

Jumpers JU8 and JU13 initiate the MAX16050 and

MAX16051 for a reverse-sequencing event. Install

shunts on jumpers JU8 and JU13 to initiate a reverse-

sequencing event. Remove the shunts at jumpers JU8

and JU13 for proper power-up operation when EN =

high. To drive SHDN externally, place a square-wave

signal with a 2V to 5.5V logic-high level at pin 1 of

jumpers JU8 or JU13. See Table 8 for jumpers JU8 and

JU13 configuration.

Table 8. Jumpers JU8, JU13 Configuration

SHUNT

SHDN INPUT SETTING

POSITION

Not

Controller enabled or externally driven

installed

Reverse power-down sequencing. RESET

asserts low.

Installed

FAULT Control (JU9, JU14)

Jumpers JU9 and JU14 control the MAX16050 and

MAX16051 input/output FAULT signal, respectively.

FAULT asserts low when any of the monitored IN volt-

ages fall below its SET voltage threshold. As an output,

FAULT can be driven externally to initiate a simultane-

ous power-down of the DC-DC controllers. Install a

shunt across jumpers JU9 and JU14 to initiate a shut-

down of the controllers. To drive FAULT externally,

place a square-wave signal with a 2V to 5.5V logic-high

Table 9. Jumpers JU9, JU14 Configuration

SHUNT

FAULT INPUT SETTING

POSITION

Not

Normal operation

installed

Disables controller. Initiates simultaneous power

Installed

down of OUT_. RESET asserts low.

6

_______________________________________________________________________________________

MAX16050 Evaluation Kit

Evluates:/MAX6051

Sequence Delay Control

The EV kit RESET signals assert low under the following

Capacitors C10 or C20 set the t

periods for U1

conditions:

DELAY

and U2 to 644μs, respectively. Replace the capacitors

1) Any monitored voltage falls below its input threshold.

2) EN falls below the enable threshold.

3) FAULT output is pulled low.

with different values to adjust the t

remove the capacitors to set the t

periods, or

periods to

DELAY

34μs. Use the following equation to calculate a new

capacitor value when adjusting the t period:

DELAY

− 34μs

4) SHDN is pulled low (note that when SHDN is pulled

low, the controller initiates a reverse-sequence

power-down).

t

DELAY

C =

5

5 ×10 Ω

where C is the capacitance of C10 or C20 in farads,

and t is in seconds.

DELAY

Table 10. SW2 Channel Bypass

Reset Timeout Control

Capacitors C11 and C21 set the t period for U1

SWITCH

BYPASS CHANNEL

U1_IN4

TIMEOUT

1

2

and U2 to 1.1ms, respectively. Replace the capacitors

U1_IN3

with a different value to adjust the t

periods, or

period to

TIMEOUT

3

U1_IN2

remove the capacitors to set the t

TIMEOUT

34μs. Use the following equation to calculate new

capacitor values when adjusting the t period:

4

U1_IN1

TIMEOUT

5

U2_IN5

t

− 34μs

5 x 10 Ω

TIMEOUT

6

U2_IN4

C =

5

7

U2_IN3

8

U2_IN2

where C is the capacitance of C11 or C21 in farads,

and t is in seconds.

9

U2_IN1

TIMEOUT

10

Not used

Channel Bypassing (SW2)

DIP switch SW2 allows the MAX16050 EV kit to bypass

any unused channels and to power up successfully when

using fewer than four or five DC-DC converters with the

U1_IN1–U1_IN4 and U2_IN1–U2_IN5 inputs, respectively.

To bypass a channel, remove the shunts connected

across pins 1-2 and 2-3 of headers J1 or J2, and set the

respective SW2 switch to the on position. See Table 10

for the input channel assignment on switch SW2.

Table 11. Input Overvoltage Thresholds

INPUT OVERVOLTAGE

INPUT CHANNEL

THRESHOLD (V)

_IN1

3.43

2.61

1.89

1.55

1.23

_IN2

_IN3

Logic Outputs (OV_OUT, RESET)

The MAX16050 EV kit features test points U1_OV_OUT,

U2_OV_OUT, U1_RESET, and U2_RESET to monitor

fault conditions on each controller. U1_OV_OUT and

U2_OV_OUT assert low when any of the monitored IN

voltages rise above their overvoltage threshold. See

Table 11 for the input channel overvoltage thresholds.

_IN4

IN5 (MAX16051 only)

_______________________________________________________________________________________

7

MAX16050 Evaluation Kit

To initiate a reverse power-down sequence, install a

shunt across jumper JU8 or JU13. When all the IN_ volt-

ages monitored by U2 (U2_IN1–U2_IN5) have dropped

below their undervoltage threshold, U2_REM output

goes high, thereby allowing U1_OUT_ to commence

sequencing down. U2_REM connects to

U1_ EN_HOLD (through SW1-2) to force U1 controller

to stay on even if U1_EN and U1_SHDN are pulled low

during a daisy-chain operation.

Configuring the MAX16050 EV Kit for

Daisy-Chain Operation (SW1)

The MAX16050 EV kit can be configured for daisy-

chain operation of the MAX16050 (U1) and the

MAX16051 (U2) by configuring DIP switch SW1 and

various jumpers. See Tables 12 and 13 for switch SW1

and the proper jumper configurations, respectively, to

configure the EV kit for daisy-chain operation. For prop-

er daisy-chain operation of U1 and U2, all of SW1

switches should be set to the on position.

Switch SW1-3 connects U1 and U2 open-drain FAULT

outputs together, resulting in a fast power-down of all

inputs when a fault condition occurs on any of the

inputs or when FAULT is manually pulled low by

installing a shunt across jumpers JU9 or JU14.

To initiate a power-up sequence, install a shunt across

pins 1-2 of jumper JU2 (U1_EN). U1_IN1–U1_IN4

sequence according to the shunt configurations of

jumpers JU4, JU5, and JU6 (Table 6). Upon U1_ inputs

rising above their respective thresholds, the U1_RESET

signal goes high and drives U2_EN input high (SW1-4)

allowing sequencing to commence on the MAX16051.

Upon U2 controller sequencing successfully,

U2_RESET goes high.

Table 12. SW1 Switch Functions

SW1

DESIGNATION

SWITCH

POSITION

EV KIT OPERATION

SHDN

On

U1 and U2 SHDN inputs connected and controlled by one signal.

Connects U2_REM to U1_EN_HOLD. Reverse-sequence U2_OUT and then U1_OUT when a

shunt is installed across jumper JU8 or JU13.

REV_SEQ

On

Connects UI_FAULT and U2_FAULT. All outputs power down simultaneously during fault

conditions.

FAULT

On

SEQ

Connects U1_RESET to U2_EN. Sequences U1 OUT_ and then U2 OUT_.

Evluates:/MAX6051

Table 13. Jumper Configuration for Daisy-Chain Operation

SHUNT

POSITION

JUMPER

EV KIT OPERATION

JU2

JU7

1-2

U1 controllers enabled at U1_VCC = 3.3V (DC-DC mode)

U1_EN_HOLD controlled by U2_REM

U1_SHDN and U2_SHDN = high

Not installed

1-2

JU8, JU13

JU9, JU14

JU11

U1_FAULT and U2_FAULT connected together

U2_EN controlled by switch SW1-4

JU15

U2_EN_HOLD = high

8

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MAX16050 Evaluation Kit

Evluates:/MAX6051

Figure 2a. MAX16050 EV Kit Schematic (Sheet 1 of 2)

_______________________________________________________________________________________

9

MAX16050 Evaluation Kit

Evluates:/MAX6051

Figure 2b. MAX16050 EV Kit Schematic (Sheet 2 of 2)

10 ______________________________________________________________________________________

MAX16050 Evaluation Kit

Evluates:/MAX6051

Figure 3. MAX16050 EV Kit Component Placement Guide—Component Side

______________________________________________________________________________________ 11

MAX16050 Evaluation Kit

Evluates:/MAX6051

Figure 4. MAX16050 EV Kit PCB Layout—Component Side

12 ______________________________________________________________________________________

MAX16050 Evaluation Kit

Evluates:/MAX6051

Figure 5. MAX16050 EV Kit PCB Layout—Solder Side

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13

is a registered trademark of Maxim Integrated Products, Inc.


型号：	MAX16050EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Reverse-Sequencing Operation
文件：	总13页 (文件大小：536K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX16050EVKIT [MAXIM]

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