Part Number: MAX1747

Function: Triple Charge-Pump TFT LCD DC-DC Converter

Package: 20-Pin TSSOP Type

Manufacturer: Maxim Integrated

Pinouts:

 

Description

The MAX1747 triple charge-pump DC-DC converter provides the regulated voltages required by active matrix thin-film transistor (TFT) liquid-crystal displays (LCDs) in a low-profile TSSOP package. One high power and two low-power charge pumps convert the +2.7V to +4.5V input supply voltage into three indepen dent output voltages.

The primary high-power charge pump generates an output voltage (VOUT) between 4.5V and 5.5V that is regulated within ±1%. The low-power BiCMOS control circuitry and the low on-resistance (RON) power MOSFETs maximize efficiency. The adjustable switching frequency (200kHz to 2MHz) provides fast transient response and allows the use of small low-profile ceramic capacitors.

Features

1. Adjustable Outputs
(1) Up to +5.5V Main High-Power Output
(2) Up to +35V Positive Charge-Pump Output
(3) Down to -35V Negative Charge-Pump Output

2. 200kHz to 2MHz Adjustable Switching Frequency
3. +2.7V to +4.5V Input Supply
4. Internal Power MOSFETs
5. 0.1µA Shutdown Current
6. Internal Soft-Start
7. Power-Ready Output
8. Internal Supply Sequencing
9. Fast Transient Response
10. Ultra-Thin Solution (No Inductors)
11. Thin TSSOP Package (1.1mm max)

Applications:

1. TFT Active-Matrix LCDs
2. Passive-Matrix Displays
3. Personal Digital Assistants (PDAs)

Other data sheets are available within the file: MAX1747EUP, MAX1747EUP+

 

MAX1747 Datasheet PDF Download

Part Number: AD8436

Function: Low Cost, Low Power, True RMS-to-DC Converter

Pakcage : 20-Lead Lead Frame Chip Scale [LFCSP_WQ] Type

Manufacturer: Analog Devices

Pinouts:

 

Description

The AD8436 is a new generation, translinear precision, low power, t rue rms-to-dc converter loaded with options. It computes a precise dc equivalent of the rms value of ac wave forms, including complex patterns such as those generated by switch mode power supplies and triacs. Its accuracy spans a wide range of input levels (see Figure 2) and temperatures. The ensured accuracy of ≤±0.5% and ≤10 µV output offset result from the latest Analog Devices, Inc., technology.

The crest factor error is <0.5% for CF values between 1 and 10. The AD8436 delivers true rms results at less cost than misleading peak, averaging, or digital solutions. There is no programming expense or processor overhead to consider, and the 4 mm × 4 mm package easily fits into tight applications. On-board buffer amplifiers enable the widest range of options for any rms-to-dc converter available, regardless of cost. For minimal applications, only a single external averaging capacitor is required. The built-in high impedance FET buffer provides an interface for external attenuators, frequency compensation, or driving low impedance loads. A matched pair of internal resistors enables an easily configurable gain-of-two or more, extending the usable input range even lower. The low power, precision input buffer makes the AD8436 attractive for use in portable multi-meters and other battery-powered applications.

Features

1. Delivers true rms or average rectified value of ac waveform
2. Fast settling at all input levels
3. Accuracy: ±10 μV ± 0.25% of reading (B grade)
4. Wide dynamic input range
5. 100 μV rms to 3 V rms (8.5 V p-p) full-scale input range
6. Larger inputs with external scaling
7. Wide bandwidth:
8. 1 MHz for −3 dB (300 mV)
9. 65 kHz for additional 1% error
10. Zero converter dc output offset
11. No residual switching products
12. Specified at 300 mV rms input
13. Accurate conversion with crest factors up to 10
14. Low power: 300 µA typical at ±2.4 V
15. High-Z FET separately powered input buffer
16. RIN ≥ 10
17. 12Ω, CIN ≤ 2 pF
18. Precision dc output buffer
19. Wide power supply voltage range
20. Dual: ±2.4 V to ±18 V; single: 4.8 V to 36 V
21. 4 mm × 4 mm LFCSP and 8 mm × 6 mm QSOP packages
22. ESD protected

Other data sheets are available within the file:

AD8436-EVALZ, AD8436ACPZ-R7, AD8436ACPZ-RL, AD8436ACPZ-WP

AD8436 Datasheet PDF Download