MAX17112 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – High-Performance, Step-Up, DC-DC Converter

19-4393; Rev 0; 12/08
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High-Performance, Step-Up, DC-DC Converter
General Description
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.
Applications
Notebook Computer Displays
LCD Monitor Panels
Features
o Input Overvoltage Protection
o Adjustable Output from V_IN to 20V
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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17112ETB+
-40°C to +85°C
10 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Operating Circuit
Pin Configuration
V_IN
2.6V TO 5.5V
V_OUT
6
LX
8
IN
7
LX
FB ²
MAX17112
9
SHDN
GND ⁵
3 _VL
GND ⁴
10
SS
GND
EP
COMP ¹
TOP VIEW
COMP 1 ⁺
FB 2
V_L 3
GND 4
GND 5
MAX17112
*EP
10 SS
9 SHDN
8 IN
7 LX
6 LX
*EXPOSED PAD
TDFN
3mm × 3mm
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or visit Maxim’s website at www.maxim-ic.com.