MAX17112ETB+T Maxim Integrated Products, MAX17112ETB+T Datasheet

IC CONV DC-DC STEP UP 10TDFN

MAX17112ETB+T

Manufacturer Part Number
MAX17112ETB+T
Description
IC CONV DC-DC STEP UP 10TDFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX17112ETB+T

Applications
LCD Monitor, Notebook Display
Voltage - Supply
2.6 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-TDFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Supply
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
MAX17112ETB+T
MAX17112ETB+TTR
The MAX17112 is a high-performance, step-up, DC-DC
converter that provides a regulated supply voltage for
active-matrix thin-film transistor (TFT) liquid-crystal dis-
plays (LCDs). The MAX17112 incorporates current-
mode, fixed-frequency (1MHz), pulse-width modulation
(PWM) circuitry with a built-in, n-channel power MOSFET
to achieve high efficiency and fast-transient response.
The input overvoltage protection (OVP) function pre-
vents damage to the MAX17112 from an input surge
voltage (up to 24V).
The high switching frequency (1MHz) allows the use of
ultra-small inductors and low-ESR ceramic capacitors.
The current-mode architecture provides fast-transient
response to pulsed loads. A compensation pin (COMP)
gives users flexibility in adjusting loop dynamics. The
internal MOSFET can generate output voltages up to
20V from an input voltage between 2.6V and 5.5V.
Soft-start slowly ramps the input current and is pro-
grammable with an external capacitor. The MAX17112
is available in a 10-pin TDFN package.
19-4393; Rev 0; 12/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
2.6V TO 5.5V
High-Performance, Step-Up, DC-DC Converter
Notebook Computer Displays
LCD Monitor Panels
V
IN
Simplified Operating Circuit
________________________________________________________________ Maxim Integrated Products
10
9
3
8
IN
SHDN
V
SS
L
6
General Description
LX
MAX17112
EP
GND
7
LX
COMP
Applications
GND
GND
FB
5
2
4
1
V
OUT
o Input Overvoltage Protection
o Adjustable Output from V
o 2.6V to 5.5V Input Supply Range
o Input Supply Undervoltage Lockout
o 1MHz Fixed Switching Frequency
o Programmable Soft-Start
o Small 10-Pin, TDFN Package
o Thermal-Overload Protection
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX17112ETB+
TOP VIEW
PART
*EXPOSED PAD
COMP
GND
GND
FB
V
L
1
2
3
4
5
+
Ordering Information
-40°C to +85°C
TEMP RANGE
3mm × 3mm
MAX17112
TDFN
Pin Configuration
IN
to 20V
*EP
10
PIN-PACKAGE
9
8
7
6
Features
10 TDFN-EP*
SS
SHDN
IN
LX
LX
1

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MAX17112ETB+T Summary of contents

Page 1

... COMP SS GND EP ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. o Input Overvoltage Protection o Adjustable Output from V o 2.6V to 5.5V Input Supply Range o Input Supply Undervoltage Lockout o 1MHz Fixed Switching Frequency ...

Page 2

High-Performance, Step-Up, DC-DC Converter ABSOLUTE MAXIMUM RATINGS LX to GND ..............................................................-0.3V to +24V IN to GND ...............................................................-0.3V to +24V SHDN GND..................................................-0.3V to +7.5V L COMP, SS GND ..................................-0. Switch Maximum Continuous RMS Current ...

Page 3

High-Performance, Step-Up, DC-DC Converter ELECTRICAL CHARACTERISTICS (continued 3V 0°C to +85°C, unless otherwise noted PARAMETER SOFT-START Reset Switch Resistance Charge Current V SS CONTROL INPUTS Threshold Input Hysteresis Discharge Resistance V L Charge Current ...

Page 4

High-Performance, Step-Up, DC-DC Converter ELECTRICAL CHARACTERISTICS (continued 3V -40°C to +85°C, unless otherwise noted.) (Note PARAMETER n-CHANNEL MOSFET Current Limit On-Resistance V L Current-Sense Transresistance V L SOFT-START Reset ...

Page 5

High-Performance, Step-Up, DC-DC Converter (Circuit of Figure 5V 15V MAIN SWITCHING FREQUENCY vs. INPUT VOLTAGE 1100 1000 900 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) LOAD-TRANSIENT RESPONSE (I = 50mA ...

Page 6

High-Performance, Step-Up, DC-DC Converter PIN NAME Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. Typical values 1 COMP are 47k Feedback. The FB regulation voltage is 1.24V nominal. Connect an external resistor-divider center 2 FB ...

Page 7

High-Performance, Step-Up, DC-DC Converter CLOCK 1.2MHz OSCILLATOR SHUTDOWN SHDN Figure 2. Functional Diagram Detailed Description The MAX17112 is a highly efficient, power-management IC that employs a current-mode, fixed-frequency, PWM architecture for fast-transient response and low-noise ...

Page 8

High-Performance, Step-Up, DC-DC Converter Output Current Capability The output current capability of the MAX17112 is a function of current limit, input voltage, operating fre- quency, and inductor value. Because of the slope com- pensation used to stabilize the feedback loop, ...

Page 9

High-Performance, Step-Up, DC-DC Converter V IN 4. 4.7μF 4.7μF 10V 10V LOGIC 10kΩ INPUT SHDN PROTECTION RESISTOR Figure 3. Application Circuit Using Logic Input at SHDN Table 1. Component List DESIGNATION DESCRIPTION 4.7μF ±10%, 10V X5R ...

Page 10

High-Performance, Step-Up, DC-DC Converter The maximum output current, input voltage, output volt- age, and switching frequency determine the inductor value. Very high inductance values minimize the current ripple, and therefore, reduce the peak current, which decreases core losses in the ...

Page 11

High-Performance, Step-Up, DC-DC Converter and: ≈ RIPPLE ESR ( ) PEAK ESR COUT where I is the peak inductor current (see the PEAK Inductor Selection section). For ceramic capacitors, the output voltage ripple is typically dominated by ...

Page 12

... 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products ...

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