MAXIM MAX5128 Technical data

General Description

The MAX5128 nonvolatile, single, linear-taper, digital
potentiometer performs the function of a mechanical
potentiometer, but replaces the mechanics with a sim­ple 2-wire digital interface. The MAX5128 performs the
same function as a discrete potentiometer or variable
resistor and features 128 taps and 22kΩ end-to-end
resistance. The MAX5128 also features an ultra-small,
2mm x 2mm µDFN package and low 0.5µA (typ) stand­by supply current, making this device ideal for portable
applications. The MAX5128 operates from a +2.7V to
+5.25V power supply. An integrated nonvolatile memo­ry recalls the programmed wiper position of the digital
potentiometer. A simple 2-wire up/down interface pro­grams the wiper position. The digital potentiometer pro­vides a low 5ppm/°C ratiometric temperature coefficient
and is specified over the extended -40°C to +85°C tem­perature range.

Applications

V

COM

Adjustment for LCD Panels

Backlight Adjustment

LED Bias Adjustment

Power-Supply Modules

Fiber-Module Bias Setting

Bias Setting for Radios

Portable Consumer Electronics

Features

♦ Ultra-Small, 2mm x 2mm, 8-Pin µDFN Package

♦ Power-On Recall of Wiper Position from

Nonvolatile Memory

♦ 22kΩ End-to-End Resistance

♦ 128 Tap Positions

♦ 5ppm/°C Ratiometric Temperature Coefficient

♦ 1.5µA (max) Standby Supply Current

♦ +2.7V to +5.25V Single Supply Operation

♦ 80,000 Wiper Store Cycles

♦ 50-Year Wiper Data Retention

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital

Potentiometer in 2mm x 2mm µDFN Package

________________________________________________________________ Maxim Integrated Products 1

19-3929; Rev 2; 6/07

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Ordering Information

Functional Diagram

+Denotes a lead-free package.

PART

M AX 5128E LA+ -40°C to +85°C 8 µDFN AAF L822-1

TEMP

RANGE

PIN ­PA C K A G E

TOP

MARK

PKG

CODE

H

V

CC

GND

UP

DN

SERIAL

INTERFACE

POR

7

7-BIT NV MEMORY

7

128-POSITION

DECODER

128

TAPS

MAX5128

W

L

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VCCto GND...........................................................-0.3V to +6.0V

UP and DN to GND ....................................-0.3V to (V

CC

+ 0.3V)

H, L, and W to GND....................................-0.3V to (V

CC

+ 0.3V)

Maximum Continuous Current into H, L, and W ..............±0.5mA

Maximum Continuous Current into All Other Pins ............±50mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin µDFN (derate 4.7mW/°C above +70°C) ........376.5mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.25V, H = VCC, L = GND, TA= -40°C to +85°C. Typical values are at VCC= +5.0V, TA= +25°C, unless otherwise noted.)
(Note 1)

DC PERFORMANCE (voltage-divider mode)

Resolution N 7 Bits

Integral Nonlinearity INL (Note 2) ±1.0 LSB

Differential Nonlinearity DNL (Note 2) ±1.0 LSB

End-to-End Resistance
Temperature Coefficient

Ratiometric Resistance
Temperature Coefficient

Full-Scale Error FSE -3 0 LSB

Zero-Scale Error ZSE 0 +2 LSB

DC PERFORMANCE (variable-resistor mode)

Integral Nonlinearity INL (Note 3) ±1.75 LSB

Differential Nonlinearity DNL (Note 3) ±1 LSB

DC PERFORMANCE (resistor characteristics)

Wiper Resistance R

Wiper Capacitance C

End-to-End Resistance R

DIGITAL INPUTS (UP, DN)

Input-High Voltage (Note 5) V

Input-Low Voltage V

Input Leakage Current I

Input Capacitance C

DYNAMIC CHARACTERISTICS

Wiper -3dB Bandwidth f

THD Plus Noise THD+N

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TC

R

(Note 4) 0.6 0.8 kΩ

W

W

HL

3.4V ≤ VCC ≤ 5.25V 2.4

IH

2.7V ≤ VCC < 3.4V

(Note 5)

IL

IN

IN

3dB

(Note 6) 400 kHz

V

= 0.3V

H

midscale

RMS

50 ppm/°C

5 ppm/°C

20 pF

16 22 27 kΩ

0.7 x
V

CC

0.8

±1 µA

5pF

, f = 1kHz, wiper set to

0.02 %

V

V

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital

Potentiometer in 2mm x 2mm µDFN Package

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.25V, H = VCC, L = GND, TA= -40°C to +85°C. Typical values are at VCC= +5.0V, TA= +25°C, unless otherwise noted.)
(Note 1)

TIMING CHARACTERISTICS

(VCC= +2.7V to +5.25V, H = VCC, L = GND, TA= -40°C to +85°C. Typical values are at VCC= +5.0V, TA= +25°C, unless otherwise noted.)
(See Figures 1, 2, 3, and 4).

NONVOLATILE MEMORY RELIABILITY

Data Retention TA = +85°C 50 Years

Endurance

POWER SUPPLY

Supply Voltage V

Average Programming Current I

Peak Programming Current I

Standby Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CC

PG

PK

CC

TA = +25°C 80,000

= +85°C 50,000

T

A

2.70 5.25 V

During nonvolatile write only;
digital inputs = V

During nonvolatile write only;
digital inputs = V

Digital inputs = VCC or GND, TA = +25°C 0.5 1.5 µA

or GND

CC

or GND

CC

220 400 µA

4mA

Stores

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG SECTION

Wiper Settling Time t

DIGITAL SECTION

UP or DN Pulse-Width High t

UP or DN Pulse-Width Low t

UP or DN Glitch Immunity t

UP Fall to DN Rise Setup or DN
Fall to UP Rise Setup

Before Entering NVM-Write
Mode, UP Fall to UP Rise

UP Rise to DN Rise Setup when
Entering NVM-Write

PWH

PWL

IMMU

t

MS1

t

MS2

t

WS

(Note 7) 500 ns

S

80 ns

80 ns

20 ns

80 ns

80 ns

80 ns

UP Fall to DN Fall Hold or DN Fall
to UP Fall Hold during NVM­Write

t

WH

0ns

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package

4 _______________________________________________________________________________________

TIMING CHARACTERISTICS (continued)

(VCC= +2.7V to +5.25V, H = VCC, L = GND, TA= -40°C to +85°C. Typical values are at VCC= +5.0V, TA= +25°C, unless otherwise noted.)
(See Figures 1, 2, 3, and 4).

Note 1: All devices are production tested at TA= +25°C and are guaranteed by design for TA= -40°C to +85°C.
Note 2: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V

CC

and L = GND. The

wiper terminal is unloaded and measured with a high input-impedance voltmeter.

Note 3: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = GND.

For the +5V condition, the wiper terminal is driven with a source current of 200µA and for the +2.7V condition, the wiper ter­minal is driven with a source current of 100µA.

Note 4: The wiper resistance is measured using the source currents given in Note 3.
Note 5: The device draws higher supply current when the digital inputs are driven with voltages between (V

CC

- 0.5V) and (GND +

0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.

Note 6: Wiper at midscale with a 10pF load, L = GND, an AC source is applied to H, and the output is measured as 3dB lower than

the DC W/H value in dB.

Note 7: Wiper-settling time is the worst-case 0 to 50% rise time measured between consecutive wiper positions. H = V

CC

, L = GND,
and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe. See the Tap-to-Tap Switching Transient
in the Typical Operating Characteristics section.

Note 8: Power-up settling time is measured from the time V

CC

= 2.7V to the wiper settling to 1 LSB of the final value.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

NVM-Write Mode Pulse-Width
High

Write NV Register Busy Time t

Power-Up Settling Time t

t

WP

BUSY

ACC

80 ns

14 ms

(Note 8) 2 µs

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital

Potentiometer in 2mm x 2mm µDFN Package

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VCC= +5.0V, TA= +25°C, unless otherwise noted.)

INTEGRAL NONLINEARITY

vs. CODE (VOLTAGE-DIVIDER)

0.12

0.10

0.08

0.06

0.04

0.02

INL (LSB)

0

-0.02

-0.04

-0.06
0243612 48 60 72 84 96 108 120

VCC = 2.7V, TA = -40°C

CODE

MAX5128 toc01

0.12

0.10

0.08

0.06

0.04

0.02

INL (LSB)

-0.02

-0.04

-0.06

DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)

MAX5128 toc04

0.010

0.008

0.006

0.004

0.002

DNL (LSB)

-0.002

-0.004

-0.006

-0.008

-0.010

0.010

0.008

0.006

0.004

0.002

0

DNL (LSB)

-0.002

-0.004

-0.006

-0.008

-0.010
0243612 48 60 72 84 96 108 120

VCC = 2.7V, TA = -40°C

CODE

INTEGRAL NONLINEARITY

vs. CODE (VOLTAGE-DIVIDER)

VCC = 2.7V, TA = +25°C

0

0243612 48 60 72 84 96 108 120

CODE

DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)

VCC = 2.7V, TA = +25°C

0

0243612 48 60 72 84 96 108 120

CODE

MAX5128 toc02

MAX5128 toc05

INTEGRAL NONLINEARITY

vs. CODE (VOLTAGE-DIVIDER)

0.12

0.10

0.08

0.06

0.04

0.02

INL (LSB)

0

-0.02

-0.04

-0.06
0243612 48 60 72 84 96 108 120

VCC = 2.7V, TA = +85°C

CODE

DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)

0.010

0.008

0.006

0.004

0.002

0

DNL (LSB)

-0.002

-0.004

-0.006

-0.008

-0.010
0243612 48 60 72 84 96 108 120

VCC = 2.7V, TA = +85°C

CODE

MAX5128 toc03

MAX5128 toc06

INTEGRAL NONLINEARITY

vs. CODE (VARIABLE RESISTOR)

1.5

1.0

0.5

0

INL (LSB)

-0.5

-1.0

-1.5
0243612 48 60 72 84 96 108 120

VCC = 2.7V, TA = -40°C

CODE

MAX5128 toc07

INTEGRAL NONLINEARITY

vs. CODE (VARIABLE RESISTOR)

1.5

1.0

0.5

0

INL (LSB)

-0.5

-1.0

-1.5
0243612 48 60 72 84 96 108 120

VCC = 2.7V, TA = +25°C

CODE

MAX5128 toc08

INTEGRAL NONLINEARITY

vs. CODE (VARIABLE RESISTOR)

1.5

1.0

0.5

0

INL (LSB)

-0.5

-1.0

-1.5
0243612 48 60 72 84 96 108 120

VCC = 2.7V, TA = +85°C

CODE

MAX5128 toc09

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= +5.0V, TA= +25°C, unless otherwise noted.)

DIFFERENTIAL NONLINEARITY

vs. CODE (VARIABLE RESISTOR)

0.20

0.15

0.10

0.05

0

DNL (LSB)

-0.05

-0.10

-0.15

-0.20
0243612 48 60 72 84 96 108 120

160

140

120

100

RATIOMETRIC TEMPCO (ppm/°C)

MAX5128 toc10

0.20

0.15

0.10

0.05

0

DNL (LSB)

-0.05

-0.10

-0.15

-0.20
0243612 48 60 72 84 96 108 120

VCC = 2.7V, TA = -40°C

CODE

RATIOMETRIC TEMPERATURE

COEFFICIENT vs. CODE (VOLTAGE-DIVIDER)

VCC = 2.7V

TA = -40°C TO +85°C

80

60

40

20

0

-20
0243612 48 60 72 84 96 108 120

CODE

DIFFERENTIAL NONLINEARITY

vs. CODE (VARIABLE RESISTOR)

VCC = 2.7V, TA = +25°C

CODE

900

MAX5128 toc13

800

700

600

500

400

(ppm/°C)

VR

300

TC

200

100

0

-100

DIFFERENTIAL NONLINEARITY

vs. CODE (VARIABLE RESISTOR)

0.25

0.20

MAX5128 toc11

0.15

0.10

0.05

0

DNL (LSB)

-0.05

-0.10

-0.15

-0.20

-0.25
0243612 48 60 72 84 96 108 120

TEMPERATURE COEFFICIENT

vs. CODE (VARIABLE RESISTOR)

TA = -40°C TO +85°C

VCC = 2.7V

0243612 48 60 72 84 96 108 120

CODE

VCC = 2.7V, TA = +85°C

MAX5128 toc12

CODE

MAX5128 toc14

END-TO-END RESISTANCE (RHL)

% CHANGE vs. TEMPERATURE

1.0

0.8

0.6

0.4

0.2

0

-0.2

-0.4

-0.6

END-TO-END RESISTANCE CHANGE (%)

-0.8

-1.0

-40 10-15 35 60 85
TEMPERATURE (°C)

MAX5128 toc15

1.5

1.2

0.9

(μA)

DD

I

0.6

0.3

STANDBY SUPPLY CURRENT

vs. TEMPERATURE

VCC = 5.25V

VCC = 3.3V

VCC = 2.7V

0

-40 10-15 35 60 85
TEMPERATURE (°C)

MAX5128 toc16

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital

Potentiometer in 2mm x 2mm µDFN Package

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VCC= +5.0V, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. DIGITAL INPUT VOLTAGE

1000

100

(μA)

10

DD

I

1

0.1
0 5.0

DIGITAL INPUT VOLTAGE (V)

10

VCC = 5V
WIPER = MIDSCALE
FILTER BANDWIDTH = 80kHz

1

VCC = 5V

4.54.03.53.02.52.01.51.00.5

THD+N vs. FREQUENCY

MAX5128 toc17

1000

(Ω)

W

R

800

600

400

200

0

WIPER RESISTANCE

vs. TEMPERATURE

VCC = 5V

WIPER = MIDSCALE

-40 10-15 35 60 85
TEMPERATURE (°C)

TAP-TO-TAP SWITCHING TRANSIENT

MAX5128 toc20

MAX5128 toc18

WIPER RESPONSE

vs. FREQUENCY

0

-2

-4

-6

-8

-10

GAIN (dB)

-12

-14

-16

-18

0.1 1 10 100 1000
FREQUENCY (kHz)

MAX5128 toc21

VCC = 5V
WIPER = MIDSCALE

UP
2V/div

MAX5128 toc19

0.1

THD+N (%)

0.01

0.001

0.0001

0.1 100
FREQUENCY (kHz)

101

WIPER RESISTANCE vs. CODE

600

500

400

(Ω)

300

W

R

200

100

0

0243612 48 60 72 84 96 108 120

CODE

MAX5128 toc22

H = V

CC

L = GND
FROM MIDSCALE

= 20pF

C

W

1μs/div

MIDSCALE WIPER TRANSIENT

AT POWER-ON

10μs/div

MAX5128 toc23

V

W

20mV/div
AC-COUPLED

V

CC

2V/div

OUTPUT
W
2V/div

MAX5128

Detailed Description

The MAX5128 nonvolatile, single, linear-taper, digital
potentiometer performs the function of a mechanical
potentiometer or variable resistor, but replaces the
mechanics with a simple 2-wire digital interface. This
device features 128 taps and 22kΩ end-to-end resis­tance with a 5ppm/°C ratiometric temperature coeffi­cient. The MAX5128 operates from a +2.7V to +5.25V
power supply and consumes only 0.5µA (typ) of stand­by supply current. The MAX5128 includes an integrat­ed nonvolatile memory that recalls the stored wiper
position of the digital potentiometer. A simple 2-wire
up/down interface programs the wiper positions.

Analog Circuitry

The MAX5128 consists of a resistor array with 127
resistive elements; 128 tap points along the resistor
string between H and L are accessible to the wiper, W.
Select the wiper tap point by programming the poten­tiometer through the 2-wire (UP, DN) interface.

The MAX5128 features power-on reset circuitry that
loads the wiper position from the nonvolatile memory at
power-up.

The nonvolatile memory is programmed to midscale at
the factory.

128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package

8 _______________________________________________________________________________________

Pin Description

Figure 1. Digital-Interface Timing Diagram

PIN NAME FUNCTION

1V

2H

3 W Wiper Terminal

4L

5 GND Ground

6 DN Down Input

7 UP Up Input

8 N.C. No Connection. Not internally connected.

CC

Power Supply. Bypass VCC with a 0.1µF capacitor to GND as close to the device as possible. For proper
operation, limit the supply voltage slew rate to ≥ 10µs.

High Terminal. The voltage at H can be higher than or lower than the voltage at L. Current can flow into or
out of H.

Low Terminal. The voltage at L can be higher than or lower than the voltage at H. Current can flow into or out
of L.

t

PWH

t

PWL

UP

DN

t

MS1

NVM WRITE

t

MS1

t

PWL

t

PWH

t

WP

t

WS

t

WH

Digital Interface

The MAX5128 features a 2-wire interface consisting of
two logic inputs (UP and DN). Logic inputs UP and DN
control the wiper position and program the position to
the nonvolatile memory. Transition UP from high to low
with DN low to increment the wiper position. Transition
DN from high to low with UP low to decrement the wiper
position (see Figures 1, 2, and 3). When the wiper decre­ments, it decreases the resistance between W and L
(and it increases the resistance between H and W).

To program the nonvolatile memory, force UP high,
then force DN high, and then transition either input
(UP/DN) from high to low (see Figure 3).

The wiper performs a make-before-break transition,
ensuring that an open circuit during a transition from
one resistor tap to another does not occur. The wiper
does not wrap around when it reaches either end of the
resistor array (max/min). Additional transition com-

mands in the direction of the end point do not change
the tap position.

The logic inputs also feature pulse glitch immunity
(20ns) to protect the wiper from transitioning due to
glitches (see Figure 4).

Write NV Register

The internal EEPROM consists of a 7-bit nonvolatile
memory that retains the value written to it even after
power-down. To program the nonvolatile memory, force
UP high, then force DN high, and then transition either
input (UP/DN) from high to low. A nonvolatile write
requires a busy time of 14ms (max). During the busy
time, any nonvolatile write requests are ignored as well
as requests to increment or decrement the wiper posi­tion. Upon power-up, the wiper returns to the position
stored in the nonvolatile register. The MAX5128 fea­tures a factory-default wiper position of midscale.

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital

Potentiometer in 2mm x 2mm µDFN Package

_______________________________________________________________________________________ 9

Figure 2. Digital-Interface Timing Diagram with t

BUSY

Figure 3. Digital-Interface Command Diagram

NVM

t

PWH

UP

t

PWL

t

MS2

WRITE

t

WP

t

BUSY

DN

UP

DN

WIPER

INCREMENTS

WIPER

DECREMENTS

NVM

WRITE

t

BUSY

NVM

WRITE

t

WS

t

BUSY

t

WH

WIPER

INCREMENTS

WIPER

DECREMENTS

MAX5128

Standby Mode

The MAX5128 operates in standby mode while the seri­al interface is inactive. Programming the MAX5128
increases the average operating current to 400µA
(max). When in standby mode, the static supply current
reduces to less than 0.5µA (typ).

Power-Up

Upon power-up, the MAX5128 updates the wiper posi­tion with the data stored in the nonvolatile memory. This
initialization period takes 2µs (typ). For proper opera­tion, limit the supply voltage slew rate to ≥ 10µs.

Applications Information

Use the MAX5128 for applications requiring digitally
controlled adjustable resistance or voltage, such as
LCD contrast control (where voltage biasing adjusts the
display contrast), or DC-DC converters with adjustable
outputs. The 22kΩ end-to-end resistance is divided into
128 tap points of 172Ω each. Use the MAX5128 in a
voltage-divider or variable-resistor configuration.

V

COM

Generator

Figure 5 shows an application using the MAX4238 and
the MAX5128 to generate the V

COM

voltage for a LCD
panel. Adjusting the resistor value of the MAX5128
changes the V

COM

voltage. Adjusting the V

COM

volt-

age changes the contrast for the LCD panel.

DC-DC Converter Applications

Figures 6 and 7 show two applications using the
MAX5128 to adjust the output voltage of a DC-DC con­verter. Figure 6 shows the MAX5128 in the grounded
potentiometer configuration. Figure 7 shows the
MAX5128 in a floating potentiometer configuration. The
grounded potentiometer configuration forces the output
voltage range of the DC-DC converter to fall within the
supply voltage range of the MAX5128. Use the floating
potentiometer configuration to allow the DC-DC con­verter’s output to exceed the supply voltage range of
the MAX5128. The floating potentiometer configuration
increases the output voltage range and increases the
precision of the output voltage adjustment range.

LED Bias Adjustment

Figure 8 shows a LED bias adjustment application
using a MAX5128 to set the current of the LEDs that the
MAX1574 drives. Use the MAX5128 for an adjustable
LED current drive of 10mA to 60mA.

Chip Information

PROCESS: BiCMOS

128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package

10 ______________________________________________________________________________________

Figure 4. Glitch-Immunity Timing Diagram

t

IMMU

t

IMMU

UP

DN

PULSES WITH WIDTHS LESS THAN t

ARE IGNORED.

IMMU

t

IMMU

t

IMMU

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital

Potentiometer in 2mm x 2mm µDFN Package

______________________________________________________________________________________ 11

Figure 5. V

COM

Generator Circuit for LCD Panels

Figure 6. DC-DC Converter Using a Grounded Potentiometer

= 0.8V

V

IN

TO V

OUT

TIMING-CONTROL-IC

OUTPUT SIGNAL

LX

MAX1722

BATT

GND

OUT

FB

10kΩ

+3.3V

W

27kΩ

36kΩ

MAX5128

0.1μF

H

L

V

= 2V

OUT

TO 5.25V

15kΩ

MAX4238

+5V

0.1μF

+3.3V

120kΩ

H

W

L

22kΩ

51kΩ

MAX5128

V

COM

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package

12 ______________________________________________________________________________________

Figure 7. DC-DC Converter Using a Floating Potentiometer

Figure 8. LED Bias Adjustment Using the MAX5128

123

87465

N.C. DN GNDUP

V

CC

LWH

MAX5128

TOP VIEW

2mm x 2mm μDFN

Pin Configuration

SW

V

= 2.7V TO 5.5V

CC

V

CC

SHDN

CPCN

VIN = 2.7V
TO 5.5V

IN

MAX1574

H

OUT

LED1

MAX8574

GND

V

LX

H

FB

W

MAX5128

L

= VCC TO 28V

OUT

MAX5128

W

SET

L

GND

LED2

LED3

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital

Potentiometer in 2mm x 2mm µDFN Package

______________________________________________________________________________________ 13

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

D

XXXX
XXXX
XXXX

PIN 1
INDEX AREA

SAMPLE
MARKING

7

A

E

L

e

C

L

A A

(N/2 -1) x e)

b

N

SOLDER
MASK
COVERAGE

PIN 1

0.10x45∞

1

L1

C

L

6, 8, 10L UDFN.EPS

-DRAWING NOT TO SCALE-

A1

b

A

A2

L

e

EVEN TERMINAL

e

ODD TERMINAL

PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm

21-0164

L

1

A

2

MAX5128

128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package

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.

14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

Boblet

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

Revision History

Pages changed at Rev 1: 1, 9, 10, 13

Pages changed at Rev 2: 1, 9–14

COMMON DIMENSIONS

SYMBOL MIN. NOM.

A

A1

A2

D 1.95 2.00

E

L

L1

PACKAGE VARIATIONS

PKG. CODE N e b

0.70 0.75

0.15 0.20 0.25

0.020 0.025 0.035

1.95 2.00

0.30 0.40

MAX.

0.80

2.05

-

2.05

0.50

0.10 REF.

6L622-1 0.65 BSC 0.30±0.05

0.25±0.050.50 BSC8L822-1

0.20±0.030.40 BSC10L1022-1

(N/2 -1) x e

1.30 REF.

1.50 REF.

1.60 REF.

PACKAGE OUTLINE,

-DRAWING NOT TO SCALE-

6, 8, 10L uDFN, 2x2x0.80 mm

21-0164

2

A

2