Datasheet

MAX1513/MAX1514
TFT-LCD Power-Supply Controllers
8 _______________________________________________________________________________________
Pin Description
NAME
PIN
MAX1513 MAX1514
FUNCTION
1 REF REF
Internal Reference. Connect a 0.22µF ceramic capacitor from REF to the analog ground plane,
which is connected to GND. External load capability is at least 100µA.
2 SDFR SDFR
LCD Shutdown and Frequency-Select Input.
SDFR = GND, LCD shutdown, REF, buffer amplifier and the logic regulator (REG L) output stay on
SDFR = IN, 1.5MHz switching frequency
SDRF = REF, 750kHz switching frequency
SDFR = unconnected, 430kHz switching frequency
3 FBPB N.C. Buffer-Amplifier Noninverting Input for the MAX1513. Not internally connected for the MAX1514.
4 OUTB N.C. Buffer-Amplifier Output for the MAX1513. Not internally connected for the MAX1514.
5 SUPB N.C.
Buffer-Amplifier Supply Input for the MAX1513. Bypass to GND with a 0.1µF capacitor. Not internally
connected for the MAX1514.
6 FBN FBN
Gate-Off Linear Regulator (REG N) Feedback Input. FBN regulates to 125mV nominal. Connect to
the center tap of a resistive voltage-divider between the REG N output and the reference voltage
(REF) to set the output voltage. Place the resistive-divider close to this pin.
7 DEL DEL
Delay-Control Timing Capacitor. Connect a capacitor from DEL to GND to set the gate-on linear-
regulator startup delay. See the Power-Up Sequence and Delay Control Block section.
BUFFER-AMPLIFIER LARGE-SIGNAL
STEP RESPONSE
MAX1513/14 toc10
1
µ
s/div
V
FBPB
5V/div
AC-COUPLED
V
OUTB
5V/div
AC-COUPLED
BUFFER-AMPLIFIER
LOAD-TRANSIENT RESPONSE
MAX1513/14 toc11
1
µ
s/div
V
OUTB
1V/div
AC-COUPLED
I
OUTB
50mA/div
0mA
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 5V, V
MAIN
= 15V, V
GON
= 25V, V
GOFF
= -10V, V
LOGIC
= 3.3V, V
GAMMA
= 14.7V, T
A
= +25°C, unless other-
wise noted.)