MAX5128_07 [MAXIM]
128-Tap, Nonvolatile, Linear-Taper Digital Potentiometer in 2mm x 2mm レDFN Package; 128抽头，非易失，线性变化数字电位器，采用2mm x 2mmμDFN封装
| 型号： | MAX5128_07 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 128-Tap, Nonvolatile, Linear-Taper Digital Potentiometer in 2mm x 2mm レDFN Package |
| 文件： | 总14页 (文件大小：308K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3929; Rev 2; 6/07
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
General Description
Features
The MAX5128 nonvolatile, single, linear-taper, digital
potentiometer performs the function of a mechanical
potentiometer, but replaces the mechanics with a sim-
ple 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) stand-
by supply current, making this device ideal for portable
applications. The MAX5128 operates from a +2.7V to
+5.25V power supply. An integrated nonvolatile memo-
ry recalls the programmed wiper position of the digital
potentiometer. A simple 2-wire up/down interface pro-
grams the wiper position. The digital potentiometer pro-
vides a low 5ppm/°C ratiometric temperature coefficient
and is specified over the extended -40°C to +85°C tem-
perature range.
♦ 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
Applications
Ordering Information
V
Adjustment for LCD Panels
COM
TEMP
RANGE
PIN-
TOP
PKG
PART
Backlight Adjustment
PACKAGE MARK CODE
LED Bias Adjustment
MAX5128ELA+ -40°C to +85°C 8 µDFN
AAF
L822-1
+Denotes a lead-free package.
Power-Supply Modules
Fiber-Module Bias Setting
Bias Setting for Radios
Portable Consumer Electronics
Functional Diagram
H
V
CC
POR
7-BIT NV MEMORY
128-POSITION
DECODER
W
128
TAPS
7
GND
L
7
UP
DN
SERIAL
INTERFACE
MAX5128
________________________________________________________________ Maxim Integrated Products
1
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.
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
ABSOLUTE MAXIMUM RATINGS
CC
UP and DN to GND ....................................-0.3V to (V
H, L, and W to GND....................................-0.3V to (V
Maximum Continuous Current into H, L, and W .............. 0.5mA
Maximum Continuous Current into All Other Pins ............ 50mA
V
to GND...........................................................-0.3V to +6.0V
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
+ 0.3V)
+ 0.3V)
CC
CC
Continuous Power Dissipation (T = +70°C)
A
8-Pin µDFN (derate 4.7mW/°C above +70°C) ........376.5mW
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.
ELECTRICAL CHARACTERISTICS
(V = +2.7V to +5.25V, H = V , L = GND, T = -40°C to +85°C. Typical values are at V = +5.0V, T = +25°C, unless otherwise noted.)
CC
CC
A
CC
A
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE (voltage-divider mode)
Resolution
N
7
Bits
LSB
LSB
Integral Nonlinearity
Differential Nonlinearity
INL
DNL
(Note 2)
(Note 2)
1.0
1.0
End-to-End Resistance
Temperature Coefficient
TC
50
5
ppm/°C
ppm/°C
R
Ratiometric Resistance
Temperature Coefficient
Full-Scale Error
Zero-Scale Error
FSE
ZSE
-3
0
0
LSB
LSB
+2
DC PERFORMANCE (variable-resistor mode)
Integral Nonlinearity
INL
(Note 3)
(Note 3)
1.75
1
LSB
LSB
Differential Nonlinearity
DNL
DC PERFORMANCE (resistor characteristics)
Wiper Resistance
R
C
(Note 4)
0.6
20
22
0.8
27
kΩ
pF
kΩ
W
W
Wiper Capacitance
End-to-End Resistance
DIGITAL INPUTS (UP, DN)
R
16
HL
3.4V ≤ V
2.7V ≤ V
(Note 5)
≤ 5.25V
2.4
CC
CC
Input-High Voltage (Note 5)
V
V
IH
0.7 x
< 3.4V
V
CC
Input-Low Voltage
V
V
IL
0.8
1
Input Leakage Current
Input Capacitance
I
µA
pF
IN
C
5
IN
DYNAMIC CHARACTERISTICS
Wiper -3dB Bandwidth
f
(Note 6)
400
kHz
%
3dB
V
= 0.3V
, f = 1kHz, wiper set to
H
RMS
THD Plus Noise
THD+N
0.02
midscale
2
_______________________________________________________________________________________
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
ELECTRICAL CHARACTERISTICS (continued)
(V = +2.7V to +5.25V, H = V , L = GND, T = -40°C to +85°C. Typical values are at V = +5.0V, T = +25°C, unless otherwise noted.)
CC
CC
A
CC
A
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
NONVOLATILE MEMORY RELIABILITY
Data Retention
T
A
T
A
T
A
= +85°C
= +25°C
= +85°C
50
Years
80,000
50,000
Endurance
Stores
POWER SUPPLY
Supply Voltage
V
2.70
5.25
400
V
CC
During nonvolatile write only;
digital inputs = V or GND
Average Programming Current
I
220
µA
PG
CC
During nonvolatile write only;
digital inputs = V or GND
Peak Programming Current
Standby Current
I
4
mA
µA
PK
CC
I
Digital inputs = V
or GND, T = +25°C
0.5
1.5
CC
CC
A
TIMING CHARACTERISTICS
(V = +2.7V to +5.25V, H = V , L = GND, T = -40°C to +85°C. Typical values are at V = +5.0V, T = +25°C, unless otherwise noted.)
CC
CC
A
CC
A
(See Figures 1, 2, 3, and 4).
PARAMETER
ANALOG SECTION
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Wiper Settling Time
t
(Note 7)
500
ns
S
DIGITAL SECTION
UP or DN Pulse-Width High
UP or DN Pulse-Width Low
UP or DN Glitch Immunity
t
80
80
20
ns
ns
ns
PWH
t
PWL
t
IMMU
UP Fall to DN Rise Setup or DN
Fall to UP Rise Setup
t
t
80
80
80
ns
ns
ns
MS1
MS2
Before Entering NVM-Write
Mode, UP Fall to UP Rise
UP Rise to DN Rise Setup when
Entering NVM-Write
t
WS
UP Fall to DN Fall Hold or DN Fall
to UP Fall Hold during NVM-
Write
t
0
ns
WH
_______________________________________________________________________________________
3
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
TIMING CHARACTERISTICS (continued)
(V = +2.7V to +5.25V, H = V , L = GND, T = -40°C to +85°C. Typical values are at V = +5.0V, T = +25°C, unless otherwise noted.)
CC
CC
A
CC
A
(See Figures 1, 2, 3, and 4).
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
NVM-Write Mode Pulse-Width
High
t
80
ns
WP
Write NV Register Busy Time
Power-Up Settling Time
t
14
ms
µs
BUSY
t
(Note 8)
2
ACC
Note 1: All devices are production tested at T = +25°C and are guaranteed by design for T = -40°C to +85°C.
A
A
Note 2: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V
and L = GND. The
CC
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 ter-
minal 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
0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.
- 0.5V) and (GND +
CC
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 , L = GND,
CC
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
= 2.7V to the wiper settling to 1 LSB of the final value.
CC
4
_______________________________________________________________________________________
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
Typical Operating Characteristics
(V
= +5.0V, T = +25°C, unless otherwise noted.)
A
CC
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
0.12
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
0.12
0.10
0.08
0.06
0.04
0.02
0
0.12
0.10
0.08
0.06
0.04
0.02
0
V
= 2.7V, T = +85°C
A
V
= 2.7V, T = -40°C
V
= 2.7V, T = +25°C
CC A
CC
CC
A
0.10
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.02
-0.04
-0.06
-0.02
-0.04
-0.06
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
0.010
0.008
0.006
0.004
0.002
0
0.010
0.008
0.006
0.004
0.002
0
0.010
0.008
0.006
0.004
0.002
0
V
= 2.7V, T = +85°C
A
V
= 2.7V, T = -40°C
A
V
= 2.7V, T = +25°C
A
CC
CC
CC
-0.002
-0.004
-0.006
-0.008
-0.010
-0.002
-0.004
-0.006
-0.008
-0.010
-0.002
-0.004
-0.006
-0.008
-0.010
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
1.5
1.0
0.5
0
1.5
1.0
0.5
0
1.5
1.0
0.5
0
V
= 2.7V, T = -40°C
V
= 2.7V, T = +85°C
CC A
V
= 2.7V, T = +25°C
A
CC
A
CC
-0.5
-1.0
-1.5
-0.5
-1.0
-1.5
-0.5
-1.0
-1.5
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
_______________________________________________________________________________________
5
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
Typical Operating Characteristics (continued)
(V
= +5.0V, T = +25°C, unless otherwise noted.)
A
CC
DIFFERENTIAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
0.20
DIFFERENTIAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
DIFFERENTIAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
0.20
0.15
0.10
0.05
0
0.25
0.20
0.15
0.10
0.05
0
V
= 2.7V, T = +25°C
A
V
= 2.7V, T = +85°C
A
V
= 2.7V, T = -40°C
A
CC
CC
CC
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
-0.05
-0.10
-0.15
-0.20
-0.05
-0.10
-0.15
-0.20
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
RATIOMETRIC TEMPERATURE
COEFFICIENT vs. CODE (VOLTAGE-DIVIDER)
TEMPERATURE COEFFICIENT
vs. CODE (VARIABLE RESISTOR)
160
140
120
100
80
900
800
700
600
500
400
300
200
100
0
T
= -40°C TO +85°C
A
V
= 2.7V
CC
T
= -40°C TO +85°C
V
= 2.7V
A
CC
60
40
20
0
-20
-100
0
12 24 36 48 60 72 84 96 108 120
CODE
0
12 24 36 48 60 72 84 96 108 120
CODE
END-TO-END RESISTANCE (R
% CHANGE vs. TEMPERATURE
)
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
HL
1.0
0.8
1.5
1.2
0.9
0.6
0.3
0
0.6
0.4
0.2
0
V
= 5.25V
CC
V
-0.2
-0.4
-0.6
-0.8
-1.0
V
= 3.3V
CC
= 2.7V
CC
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
6
_______________________________________________________________________________________
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
Typical Operating Characteristics (continued)
(V
= +5.0V, T = +25°C, unless otherwise noted.)
A
CC
WIPER RESISTANCE
vs. TEMPERATURE
WIPER RESPONSE
vs. FREQUENCY
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
1000
0
-2
1000
100
10
V
= 5V
V
= 5V
CC
V
= 5V
CC
CC
WIPER = MIDSCALE
WIPER = MIDSCALE
800
600
400
200
0
-4
-6
-8
-10
-12
-14
-16
-18
1
0.1
-40
-15
10
35
60
85
0.1
1
10
100
1000
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DIGITAL INPUT VOLTAGE (V)
TEMPERATURE (°C)
FREQUENCY (kHz)
THD+N vs. FREQUENCY
TAP-TO-TAP SWITCHING TRANSIENT
MAX5128 toc21
10
1
V
= 5V
CC
WIPER = MIDSCALE
FILTER BANDWIDTH = 80kHz
UP
2V/div
0.1
0.01
0.001
0.0001
V
W
20mV/div
AC-COUPLED
H = V
L = GND
FROM MIDSCALE
CC
C
= 20pF
W
0.1
1
10
100
1μs/div
FREQUENCY (kHz)
MIDSCALE WIPER TRANSIENT
AT POWER-ON
WIPER RESISTANCE vs. CODE
MAX5128 toc23
600
500
400
300
200
100
0
V
CC
2V/div
OUTPUT
W
2V/div
0
12 24 36 48 60 72 84 96 108 120
CODE
10μs/div
_______________________________________________________________________________________
7
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
Pin Description
PIN
NAME
FUNCTION
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.
Power Supply. Bypass V
CC
1
V
CC
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.
2
3
4
H
W
L
Wiper Terminal
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.
5
6
7
8
GND
DN
Ground
Down Input
UP
Up Input
N.C.
No Connection. Not internally connected.
NVM WRITE
t
PWH
t
PWL
t
MS1
UP
DN
t
t
PWH
WP
t
PWL
t
t
WH
t
WS
MS1
Figure 1. Digital-Interface Timing Diagram
Analog Circuitry
Detailed Description
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 poten-
tiometer through the 2-wire (UP, DN) interface.
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 resis-
tance with a 5ppm/°C ratiometric temperature coeffi-
cient. The MAX5128 operates from a +2.7V to +5.25V
power supply and consumes only 0.5µA (typ) of stand-
by supply current. The MAX5128 includes an integrat-
ed nonvolatile memory that recalls the stored wiper
position of the digital potentiometer. A simple 2-wire
up/down interface programs the wiper positions.
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.
8
_______________________________________________________________________________________
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
NVM
WRITE
t
t
MS2
PWH
t
t
BUSY
PWL
UP
DN
t
WP
t
t
WH
WS
Figure 2. Digital-Interface Timing Diagram with t
BUSY
t
t
BUSY
BUSY
UP
DN
WIPER
DECREMENTS
NVM
WRITE
WIPER
INCREMENTS
NVM
WRITE
WIPER
INCREMENTS
WIPER
DECREMENTS
Figure 3. Digital-Interface Command Diagram
mands in the direction of the end point do not change
the tap position.
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 decre-
ments, it decreases the resistance between W and L
(and it increases the resistance between H and W).
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 posi-
tion. Upon power-up, the wiper returns to the position
stored in the nonvolatile register. The MAX5128 fea-
tures a factory-default wiper position of midscale.
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-
_______________________________________________________________________________________
9
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
t
IMMU
t
IMMU
UP
DN
t
IMMU
t
IMMU
PULSES WITH WIDTHS LESS THAN t
ARE IGNORED.
IMMU
Figure 4. Glitch-Immunity Timing Diagram
Standby Mode
DC-DC Converter Applications
Figures 6 and 7 show two applications using the
MAX5128 to adjust the output voltage of a DC-DC con-
verter. 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 con-
verter’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.
The MAX5128 operates in standby mode while the seri-
al 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 posi-
tion with the data stored in the nonvolatile memory. This
initialization period takes 2µs (typ). For proper opera-
tion, 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.
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
V
Generator
COM
Figure 5 shows an application using the MAX4238 and
the MAX5128 to generate the V voltage for a LCD
PROCESS: BiCMOS
COM
panel. Adjusting the resistor value of the MAX5128
changes the V voltage. Adjusting the V volt-
COM
COM
age changes the contrast for the LCD panel.
10 ______________________________________________________________________________________
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
+3.3V
15kΩ
120kΩ
+5V
H
0.1μF
MAX5128
W
10kΩ
22kΩ
51kΩ
TIMING-CONTROL-IC
OUTPUT SIGNAL
L
MAX4238
V
COM
+3.3V
27kΩ
0.1μF
36kΩ
Figure 5. V
COM
Generator Circuit for LCD Panels
V
= 2V
OUT
TO 5.25V
OUT
FB
LX
H
MAX1722
W
V
= 0.8V
IN
BATT
GND
TO V
OUT
MAX5128
L
Figure 6. DC-DC Converter Using a Grounded Potentiometer
______________________________________________________________________________________ 11
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
SW
V
= V TO 28V
CC
LX
OUT
H
MAX8574
V
= 2.7V TO 5.5V
V
CC
CC
W
FB
MAX5128
L
GND
SHDN
Figure 7. DC-DC Converter Using a Floating Potentiometer
Pin Configuration
TOP VIEW
CN
CP
N.C.
8
UP
7
DN
6
GND
5
V
= 2.7V
IN
IN
OUT
TO 5.5V
MAX1574
LED1
MAX5128
H
LED2
LED3
1
2
3
4
L
W
SET
MAX5128
V
CC
H
W
2mm x 2mm μDFN
L
GND
Figure 8. LED Bias Adjustment Using the MAX5128
12 ______________________________________________________________________________________
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
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.)
A
b
D
e
N
XXXX
XXXX
XXXX
SOLDER
MASK
COVERAGE
E
PIN 1
0.10x45∞
L
L1
1
SAMPLE
MARKING
PIN 1
INDEX AREA
A
A
7
(N/2 -1) x e)
C
L
C
L
b
L
L
A
e
e
A2
EVEN TERMINAL
ODD TERMINAL
A1
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
1
-DRAWING NOT TO SCALE-
21-0164
A
2
______________________________________________________________________________________ 13
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
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.)
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
0.15
0.020
1.95
1.95
0.30
NOM.
0.75
0.20
0.025
2.00
2.00
0.40
MAX.
0.80
0.25
0.035
2.05
2.05
0.50
A
A1
A2
D
-
E
L
L1
0.10 REF.
PACKAGE VARIATIONS
PKG. CODE
L622-1
N
6
e
b
(N/2 -1) x e
0.65 BSC
0.50 BSC
0.40 BSC
0.30±0.05 1.30 REF.
0.25±0.05 1.50 REF.
0.20±0.03 1.60 REF.
L822-1
8
L1022-1
10
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
2
21-0164
A
-DRAWING NOT TO SCALE-
2
Revision History
Pages changed at Rev 1: 1, 9, 10, 13
Pages changed at Rev 2: 1, 9–14
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
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