Rainbow Electronics MAX8758 - Manual (Page 11)

Detailed Description
The MAX8758 is designed primarily for TFT LCD panels
used in notebook computers. It contains a high-perfor-
mance step-up regulator, a high-speed operational
amplifier, a logic-controlled, high-voltage switch-control
block with programmable delay, and an internal linear
regulator for bootstrapping operation.
Figure 2 shows
the MAX8758 functional block diagram.
Step-Up Regulator
The step-up regulator is designed to generate the LCD
source driver supply. It employs a current-mode, fixed-
frequency PWM architecture to maximize loop band-
width and provide fast transient response to pulsed
loads typical of TFT LCD panel source drivers. The inter-
nal oscillator offers two pin-selectable frequency options
(640kHz/1.2MHz), allowing users to optimize their
designs based on the specific application requirements.
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
______________________________________________________________________________________ 11
SRC
GON
DLP
MODE
THR
CTL
DRN
SWITCH
CONTROL
SUPB
NEGB
OUTB
POSB
GND
PGND
STEP-UP
REGULATOR
CONTROLLER
FB
COMP
SS
LX
LINEAR
REGULATOR
AND BOOTSTRAP
V IN
MAX8758
SHDN
FREQ
LDO
IN
Figure 2. Functional Diagram
Table 1. Component List
DESIGNATION DESCRIPTION
C1, C2
3.3µF ±10%, 6.3V X5R ceramic capacitors
(0603)
TDK C1608X5R0J335M
C3, C4, C5
4.7µF ±20%, 10V X5R ceramic capacitors
(1206)
TDK C3216X5R1A475M
D1
3A, 30V Schottky diode (M-flat)
Toshiba CMS02 (top mark S2)
D2, D3, D4
200mA, 100V dual diodes (SOT23)
Fairchild MMBD4148SE (top mark D4)
L1
4.2µH, 1.9A inductor
Sumida CDRH6D12-4R2