General Description

The MAX16050 monitors up to 5 voltages and

sequences up to 4 voltages, while the MAX16051 moni-

tors up to 6 voltages and sequences up to 5 voltages.

These devices provide an adjustable delay as each sup-

ply is turned on and they monitor each power-supply

voltage. When all of the voltages reach their final values

and the reset delay timer expires, a power-on-reset

(POR) output deasserts allowing the microcontroller (µC)

to operate. If any voltage falls below its threshold, the

reset output asserts and all voltage supplies are turned

off. The MAX16050/MAX16051 can be daisy-chained to

control a higher number of voltages in a system.

During a power-down event, the MAX16050/MAX16051

can reverse sequence the outputs. In this situation, each

voltage is turned off sequentially until it reaches a 250mV

level, at which point, the next supply is turned off. The

MAX16050/MAX16051 also provide internal pulldown cir-

cuitry that turns on during power-down, to help dis-

charge large output capacitors.

The MAX16050/MAX16051 feature a charge-pump sup-

ply output that can be used as a pullup voltage for dri-

ving external n-channel MOSFETs and an overvoltage

output that indicates when any of the monitored voltages

exceeds its overvoltage threshold. The MAX16050 also

provides three sequence control inputs for changing the

sequence order, while the MAX16051 has a fixed

sequence order.

The MAX16050/MAX16051 are available in a 28-pin

(4mm x 4mm) thin QFN package and are fully specified

over the -40°C to +85°C extended operating tempera-

ture range.

Applications

Features

♦ Monitor Up to 6 Voltages/Sequence Up to 5

Voltages

♦ Pin-Selectable Sequencing Order (MAX16050 Only)

♦ Reverse-Sequencing Capability on Shutdown

♦ Overvoltage Monitoring with Independent Output

♦ ±1.5% Threshold Accuracy

♦ 2.7V to 13.2V Operating Voltage Range

♦ Charge Pump to Fully Enhance External

n-Channel FETs

♦ Capacitor-Adjustable Sequencing Delay

♦ Fixed or Capacitor-Adjustable Reset Timeout

♦ Internal 85mA Pulldowns for Discharging

Capacitive Loads Quickly

♦ Daisy-Chaining Capability to Communicate

Across Multiple Devices

♦ Small 4mm x 4mm, 28-Pin TQFN Package

Voltage Monitors/Sequencer Circuits with

Reverse-Sequencing Capability

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

26

27

25

24

10

+

9

11

12

1

*EP = EXPOSED PAD

2

SEQ1

45

6

7

20

21

19

17

16

15

SEQ2

SEQ3

OUT2

SET2

DISC3

OUT3

MAX16050

3

18

*EP

28

8

CP_OUT

SET3

TIMEOUT

23

13

DISC2

DELAY

22

14

EN_HOLD

SHDN

THIN QFN

(4mm x 4mm)

TOP VIEW

Pin Configurations

19-1013; Rev 0; 11/07

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.

Pin Configurations continued at end of data sheet.

PART

MONITORED

VOLTAGES

VOLTAGES

SEQUENCED

PIN-PACKAGE

PACKAGE CODE

MAX16050ETI+

5

4

28 TQFN-EP*

T2844-1

MAX16051ETI+

6

5

28 TQFN-EP*

T2844-1

Note: All devices are specified over the -40°C to +85°C operating temperature range.

+

Denotes lead-free package.

*

EP = Exposed pad.

Typical Operating Circuit appears at end of data sheet.

Servers

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Storage Systems