MAX8753ETI-T Maxim Integrated, MAX8753ETI-T Datasheet

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MAX8753ETI-T

Manufacturer Part Number
MAX8753ETI-T
Description
LCD Drivers
Manufacturer
Maxim Integrated
Datasheet
The MAX8753 quadruple-output DC-DC converter pro-
vides the regulated voltages required by active-matrix,
thin-film transistor (TFT), liquid-crystal displays (LCDs).
It includes a high-power step-up regulator (V
low-power charge pumps (V
voltage 300mA linear regulator (V
The step-up DC-DC converter is a high-frequency
(1MHz) current-mode regulator with a built-in power
MOSFET that allows the use of ultra-small inductors and
ceramic capacitors. It provides fast transient response
to pulsed loads and includes an automatic pulse-skip-
ping mode that increases efficiency over a wide-load
current range. The 1.5A current limit allows a +10V out-
put at more than 300mA from a +3.3V input.
The two charge pumps independently regulate one
positive and one negative output voltage. The positive
charge pump is a voltage tripler that accepts an input
voltage up to +13V and delivers a 20mA output up to
+28V without external switches or diodes. The negative
charge pump inverts an input voltage up to +24V and
delivers a 20mA negative output using external diodes.
The logic linear regulator converts the IC’s +2.6V-to-
+5.5V input to a regulated +2.5V or adjustable output.
The MAX8753 is available in a 28-pin thin QFN pack-
age with a maximum thickness of 0.8mm for ultra-thin
LCD panel design.
19-3919; Rev 0; 1/06
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.
TOP VIEW
Notebook Computers, PDAs
Car Navigation Displays
LCD Monitors
LCDON
PGND
SHDN
N.C.
DLP
C1N
C1P
22
23
24
25
26
27
28
________________________________________________________________ Maxim Integrated Products
21
1
20
2
General Description
19
3
MAX8753
TQFN
Pin Configuration
18
4
POS
17
5
and V
LOGIC
16
6
Applications
15
7
NEG
).
14
13
12
11
10
9
8
TFT LCD DC-DC Converter with
), and a low-
REF
GND
N.C.
IN
OUTL
FBL
FBP
MAIN
), two
Integrated Charge Pumps
o 3 Integrated DC-DC Converters, 1 LDO
o 1MHz Current-Mode PWM Boost Regulator
o Dual Charge-Pump Outputs
o 300mA Logic Linear Regulator
o +2.6V to +5.5V Input Operating Range
o 0.8mA Quiescent Current
o Internal Supply Sequencing and Soft-Start
o Thermal Protection
o Ultra-Thin, 28-Pin TQFN Package (0.8mm max)
+Denotes lead-free package.
MAX8753ETI+
V
IN
V
+2.6V TO +5.5V
LOGIC
Up to +13V Main High-Power Output
±1% Accuracy
High Efficiency (90%)
No External Diodes for Positive Charge Pump
Up to +28V Positive Charge-Pump Output
Negative Charge-Pump Output
PART
V
MAIN
IN
SUPN
SHDN
LCDON
OUTL
FBL
DLP
Minimal Operating Circuit
TEMP RANGE
-40°C to 85°C
MAX8753
Ordering Information
PGND
OUTP
GND
C3P
FBN
REF
FBP
FB
PIN-PACKAGE
28 Thin QFN
(5mm x 5mm)
Features
V
V
V
MAIN
NEG
POS
1

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MAX8753ETI-T Summary of contents

Page 1

... No External Diodes for Positive Charge Pump Up to +28V Positive Charge-Pump Output Negative Charge-Pump Output o 300mA Logic Linear Regulator o +2.6V to +5.5V Input Operating Range o 0.8mA Quiescent Current o Internal Supply Sequencing and Soft-Start o Thermal Protection o Ultra-Thin, 28-Pin TQFN Package (0.8mm max) MAX8753ETI+ +Denotes lead-free package. Applications V +2.6V TO +5. ...

Page 2

TFT LCD DC-DC Converter with Integrated Charge Pumps ABSOLUTE MAXIMUM RATINGS SHDN, LCDON to GND ......................................-0.3V to +6V IN, DLP, OUTL, FBL, FBP, FBN, INTG, FB, REF to GND ............................................-0. PGND to GND .......................................................-0.3V to +0. ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) = 3.0V, SHDN = LCDON = IN, V (Circuit of Figure 0°C to +85°C. Typical values are PARAMETER SYMBOL LX Current Limit I Soft-Start Period POSITIVE CHARGE PUMP V Input Supply ...

Page 4

... DLP Turn-On Threshold DLP Discharge Switch On-Resistance FAULT PROTECTION Duration to Trigger Fault t FAULT FBL Fault-Trip Level FB, FBP Fault-Trip Level FBN Fault-Trip Level Thermal-Shutdown Threshold Dual-Mode is a trademark of Maxim Integrated Products, Inc. 4 _______________________________________________________________________________________ = V = 10V, PGND = GND, C REF = 0.22µF, C SUPP SUPN CONDITIONS 300mA ...

Page 5

ELECTRICAL CHARACTERISTICS = 3.0V, SHDN = LCDON = IN, V (Circuit of Figure -40°C to +85°C. Typical values are at T PARAMETER SYMBOL INPUT SUPPLIES Input Supply Range Input Undervoltage Threshold IN Quiescent Supply Current SUPP Supply ...

Page 6

TFT LCD DC-DC Converter with Integrated Charge Pumps ELECTRICAL CHARACTERISTICS (continued) = 3.0V, SHDN = LCDON = IN, V (Circuit of Figure -40°C to +85°C. Typical values are PARAMETER SYMBOL SEQUENCING DLP Turn-On Threshold ...

Page 7

Figure 3V 9V MAIN OUTP VOLTAGE vs. OUTP LOAD CURRENT 24.2 24 10V SUPP 24 SUPP 23.9 23 OUTP LOAD CURRENT ...

Page 8

TFT LCD DC-DC Converter with Integrated Charge Pumps (Circuit of Figure 3V 9V MAIN OUTP SWITCHING WAVEFORMS 0 0 24V 4µs/div 5V/div 200mV/div CIN OUTP B. V ...

Page 9

PIN NAME 1 SUPP Positive Charge-Pump Supply Voltage. Bypass to PGND with a 0.1µF capacitor. 2, 12, 20, N.C. No connection. Not internally connected C2N Negative Terminal of Flying Capacitor C2 4 C2P Positive Terminal of Flying Capacitor ...

Page 10

TFT LCD DC-DC Converter with Integrated Charge Pumps V IN 6.8µH +2.6V TO +5. 10µF C INTG 470pF 11 0.1µ MAIN 19 0.1µ LOGIC 26 +2.5V, 300mA LOGIC 24 10µF ...

Page 11

Table 2. Component Suppliers SUPPLIER PHONE Fairchild 408-822-2000 Sumida 847-545-6700 Taiyo Yuden 408-573-4150 TDK 847-803-6100 Toshiba 949-455-2000 Detailed Description The MAX8753 quadruple-output DC-DC converter pro- vides the regulated voltages required by active-matrix, TFT LCDs. Figure 1 shows the typical operating ...

Page 12

TFT LCD DC-DC Converter with Integrated Charge Pumps REF-OK REF REF C REF 1.1V GND OSC OSC SLOPE COMP MAX8753 Figure 3. Step-Up Regulator Block Diagram slope compensation signal is summed with the current- sense and feedback signals. On the ...

Page 13

V SUPP SUPP CLK R ON CONTROL CTRL C1N C1 C1P C2P C2 C2N MAX8753 Figure 4. Positive Charge-Pump Regulator Block Diagram C2. If the voltage across C2 plus a diode drop ( smaller than the first ...

Page 14

TFT LCD DC-DC Converter with Integrated Charge Pumps R ON CONTROL OSC CHARGE- PUMP LOGIC MAX8753 Figure 5. Negative Charge-Pump Regulator Block Diagram Linear Regulator The MAX8753 contains a linear regulator that uses an internal pMOS transistor to supply load ...

Page 15

LCDON is high. When LCDON is logic- high, the main DC-DC step-up converter powers up with soft-start enabled. Once the main step-up converter reaches regulation, the negative charge pump turns ...

Page 16

TFT LCD DC-DC Converter with Integrated Charge Pumps plus the contributions from the positive and negative charge pumps × MAIN EFF ( ) MAIN MAX ( ) NEG where I is the maximum output ...

Page 17

The MAX8753’s high switching frequency demands a high-speed rectifier. Schottky diodes are recommend- ed for most applications because of their fast recovery time and low forward voltage. In general Schottky diode complements the internal MOSFET well. Output-Voltage Selection ...

Page 18

TFT LCD DC-DC Converter with Integrated Charge Pumps Applications Information Power Dissipation An IC’s maximum power dissipation depends on the thermal resistance from the die to the ambient environ- ment and the ambient temperature. The thermal resis- tance depends on ...

Page 19

Minimize the length and maximize the width of the traces between the output capacitors and the load for best transient response. 6) Minimize the size of the LX node while keeping it wide and short. Keep the LX node ...

Page 20

... 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. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Boblet ...

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