MAX1513 Datasheet, PDF (8/28 Pages) Maxim Integrated Products – TFT-LCD Power-Supply Controllers

TFT-LCD Power-Supply Controllers
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.)
BUFFER-AMPLIFIER LARGE-SIGNAL
STEP RESPONSE
MAX1513/14 toc10
V_FBPB
5V/div
AC-COUPLED
BUFFER-AMPLIFIER
LOAD-TRANSIENT RESPONSE
MAX1513/14 toc11
V_OUTB
1V/div
AC-COUPLED
1µs/div
V_OUTB
5V/div
AC-COUPLED
1µs/div
I_OUTB
50mA/div
0mA
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.
LCD Shutdown and Frequency-Select Input.
SDFR = GND, LCD shutdown, REF, buffer amplifier and the logic regulator (REG L) output stay on
2
SDFR
SDFR 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
Gate-Off Linear Regulator (REG N) Feedback Input. FBN regulates to 125mV nominal. Connect to
FBN 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.
8 _______________________________________________________________________________________