MAX8728ETJ+T Maxim Integrated Products, MAX8728ETJ+T Datasheet - Page 12

• Manufacturer Part Number: MAX8728ETJ+T
• Description: Display Drivers Low-Cost Multiple-Ou tput Power Supply fo
• Manufacturer: Maxim Integrated Products

Specifications of MAX8728ETJ+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-Cost, Multiple-Output
Power Supply for LCD Monitors/TVs
12
PIN
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
______________________________________________________________________________________
NAME
GND1
DRVN
SHDN
GNDP
OUT1
DRVP
SUPP
FSEL
GON
GND
SRC
CTL
BST
V
REF
FBP
LX1
INL
VL
IN
CC
Step-Down Regulator and Negative Charge-Pump Power Ground
Step-Down Regulator Output Sense Input. OUT1 is the inverting input to the internal current-sense amplifier.
Connect OUT1 directly to the step-down regulator output.
Negative Charge-Pump Regulator Driver Output. See the Negative Charge-Pump Regulator section for details.
High-Voltage Switch-Control Block Timing Control Input. See the High-Voltage Switch Control section for
Step-Down Regulator and Negative Charge-Pump Regulator Supply Input
Step-Down Regulator Switching Node. LX1 is the source of the internal high-side MOSFET. Connect the
inductor and Schottky catch diode to LX1 and minimize the trace area for low EMI.
Step-Down Regulator Bootstrap Pin. BST is the supply for the high-side MOSFET gate driver. Connect a 0.1µF
ceramic capacitor from BST to LX1.
5V Internal Linear Regulator and Startup Circuitry Supply Input. The input voltage range of INL is between
+7.0V and +13.2V. Connect a 0.22µF ceramic capacitor between INL and GND. Place the capacitor close to
the IC.
5V Internal Linear Regulator Output. VL powers the internal MOSFET gate drivers and the control circuitry.
Bypass VL to GND with a 1µF ceramic capacitor. VL can provide up to 25mA external load current.
Internal Reference Supply Input. Connect V
Active-Low Shutdown Control Input. All outputs (except for REF and VL) are disabled and the GATE pin goes
high when SHDN is low.
Analog Ground
Reference Output. Connect a 0.22µF ceramic capacitor between REF and GND. All regulator outputs are
disabled until REF exceeds its UVLO threshold.
Positive Charge-Pump Regulator Feedback Input. Connect FBP to the center of a resistive voltage-divider
between the positive output and GND to set the positive charge-pump regulator output voltage. Place the
resistive voltage-divider close to FBP.
Positive Charge-Pump Power Ground
Positive Charge-Pump Regulator Driver Output. See the Positive Charge-Pump Regulator section for details.
Positive Charge-Pump Regulator Supply Input. Connect SUPP directly to IN and bypass SUPP to GNDP with a
minimum 0.1µF ceramic capacitor.
Frequency Select Pin. Connect FSEL to REF for 500kHz operation. Connect FSEL to V
Connect to GND for 1.5MHz operation.
High-Voltage Switch Control Block Input. SRC is the source of the internal, high-voltage, p-channel MOSFET.
High-Voltage Switch Control Block Output. GON is the common junction of the internal high-voltage MOSFETs.
GON is internally pulled to GND through a 4mA internal current source when the switch control block is
disabled.
CC
directly to VL.
FUNCTION
Pin Description
CC
for 1MHz operation.