MAX1729EUB-T Maxim Integrated Products, MAX1729EUB-T Datasheet

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MAX1729EUB-T

Manufacturer Part Number
MAX1729EUB-T
Description
DC/DC Switching Converters ECB & LCD Display Bias Supply
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1729EUB-T.pdf (12 pages)

Specifications of MAX1729EUB-T

Lead Free Status / Rohs Status
Lead free / RoHS Compliant

Available stocks

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Company:
H&T Electronics H&T Electronics
Part Number:
MAX1729EUB-T
Quantity:
6 667
The MAX1729 micropower step-up/step-down DC-DC
converter is ideally suited for electrically controlled bire-
fringence (ECB) and liquid-crystal-display (LCD) bias-
supply generation. It provides step-up/step-down
voltage conversion and reduces output ripple by using
a step-up DC-DC converter followed by a linear regula-
tor. This architecture permits a physically smaller induc-
tor than those used in competing SEPIC and flyback
topologies. This device features low quiescent current
(67µA typical). A logic-controlled shutdown mode fur-
ther reduces quiescent current to 0.4µA typical.
The MAX1729 features an input that dynamically
adjusts the output voltage to control display color or
contrast. It offers two feedback modes: internal and
external. Internal feedback mode allows output volt-
ages between 2.5V and 16V, and is specifically
designed to hold temperature drift to ±11ppm/°C.
External feedback mode allows the MAX1729 output
voltage range to be tailored for various displays.
An on-chip temperature sensor with a positive tempera-
ture coefficient provides compensation for LCD/ECB
display temperature characteristics. In internal feed-
back mode, the buffered temperature sensor output is
read and used to adjust the output voltage via a digital
control signal. External feedback mode features an
additional compensation method in which the tempera-
ture output is summed directly into the feedback net-
work to provide first-order negative temperature
compensation of the output voltage. The MAX1729 is
available in the space-saving 10-pin µMAX package.
19-1406; Rev 1; 1/99
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
TOP VIEW
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
ECB Display Bias & Color Adjustment
LCD Display Bias & Contrast Adjustment
Cellular Phones
Personal Digital Assistants
COMP
REF
TC
FB
IN
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
General Description
MAX1729
MAX
Pin Configuration
10
9
8
7
6
Applications
GND
LX
PS
OUT
CTLIN
MAX1729EUB
High-Accuracy Reference Voltage (±1%)
±11ppm/°C Output Voltage Drift
On-Chip Temperature Sensor Output
Accurate Voltage and Temperature Provide:
+2.7V to +5.5V Input Voltage Range
Output Voltage Range
Dynamic Control of the Output Voltage
67µA Supply Current
0.4µA Shutdown Current
10-Pin µMAX Package (1.09mm max height)
Evaluation Kit Available (MAX1729EVKIT)
CONTROLLER
Consistent ECB Colors
Consistent LCD Gray-Scale Contrast
+2.5V to +16V in Internal Feedback Mode
Programmable in External Feedback Mode
PART
2.7V to 5.5V
DIGITAL
PWM
ADC
V
IN
Typical Operating Circuit
TEMP. RANGE
-40°C to +85°C
GND
IN
REF
CTLIN
TC
Ordering Information
MAX1729
COMP
OUT
PS
LX
FB
10 µMAX
PIN-PACKAGE
Features
V
+2.5V to +16V
OUT
1

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MAX1729EUB-T Summary of contents

Page 1

... Internal Feedback Mode Programmable in External Feedback Mode Dynamic Control of the Output Voltage 67µA Supply Current 0.4µA Shutdown Current 10-Pin µMAX Package (1.09mm max height) Evaluation Kit Available (MAX1729EVKIT) PART MAX1729EUB Applications 2.7V to 5.5V DIGITAL GND PWM CONTROLLER LX PS ...

Page 2

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +6V LX, PS, OUT to GND...............................................-0.3V to +20V CTLIN, FB, REF, COMP GND ...........-0. ...

Page 3

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation ELECTRICAL CHARACTERISTICS (V = +3V, CTLIN = IN GND PARAMETER SYMBOL CTLIN Low Voltage CTLIN Bias Current COMP Impedance R COMP CTLIN ...

Page 4

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation (Circuit of Figure +25°C, unless otherwise noted.) A EFFICIENCY vs. OUTPUT CURRENT V = 9.4 (CTLIN AT 50% DUTY CYCLE) OUT ...

Page 5

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation (Circuit of Figure +25°C, unless otherwise noted.) A DELAY TO SHUTDOWN V CTLIN 5V/div V REF 1V/div V TC 1V/div V OUT V = ...

Page 6

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation PIN NAME 1 IN Supply Input. Bypass with 0.1µF capacitor to ground. Connect to supply side of inductor (L1 Temperature-Sensor Output. Bypass to GND with ...

Page 7

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation IN TC BOOST TEMPERATURE CONVERTER SENSOR LDO REF VOLTAGE LINEAR REFERENCE REGULATOR MAX1729 FB FEEDBACK CONTROL 122mV SHUTDOWN CONTROL V REF CTLIN GND COMP GND NOTE: SWITCH ...

Page 8

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation To use a DC control signal to adjust the output voltage, use the circuit shown in Figure 4. In this configuration governed by the following ...

Page 9

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation 2) Given the maximum output voltage (V mum output voltage (V ), calculate values for R3 and MIN R4 as follows 1/2 V – ...

Page 10

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation Table 1. Recommended Inductors SUPPLIER PART Murata LQH3C221K04M00 Panasonic ELT3KN115B Table 2. Recommended Capacitor Values CAPACITANCE CAPACITOR C6* *Use a low-leakage capacitor. ...

Page 11

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation ______________________________________________________________________________________ Package Information 11 ...

Page 12

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation 12 ______________________________________________________________________________________ NOTES ...

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