MAX16928_12 Datasheet, PDF (7/20 Pages) Maxim Integrated Products – Automotive TFT-LCD Power Supply with Boost Converter and Gate Voltage Regulators

MAX16928
Automotive TFT-LCD Power Supply with Boost
Converter and Gate Voltage Regulators
Pin Configuration
TOP VIEW
ENP 1
+
DR 2
FB 3
GATE 4
PGNDP 5
LXP 6
INA 7
COMPV 8
FBP 9
N.C. 10
MAX16928
EP
TSSOP
20 SEQ
19 REF
18 FBGL
17 FBGH
16 COMPI
15 GND
14 DRVN
13 GH
12 CP
11 PGOOD
Pin Description
PIN
NAME
FUNCTION
1
ENP
Boost Circuitry and 1.8V/3.3V Regulator Controller Enable Input. ENP has an internal 500kI pulldown
resistor. Drive high for normal operation and drive low to place the device in shutdown.
2
DR
1.8V or 3.3V Regulator Output. DR has a 4.5mA (min) drive capability. For greater output current capa-
bility, use an external npn bipolar transistor whose base is connected to DR.
1.8V or 3.3V Regulator Feedback Input. FB is regulated to 1.8V or 3.3V. Connect FB to DR when power-
3
FB
ing loads demanding less than 4.5mA. For greater output current capability, use an external npn bipo-
lar transistor whose emitter is connected to FB.
External p-Channel FET Gate Drive. GATE is an open-drain driver connected to the gate of the external
4
GATE input series p-channel FET. Connect a pullup resistor between GATE and INA. During a fault condition,
the gate driver turns off and the pullup resistor turns off the FET.
5
PGNDP Boost Converter Power Ground
6
LXP Boost Converter Switching Node. Connect LXP to the inductor and catch diode of the boost converter.
7
INA Boost Circuitry and 1.8V/3.3V Regulator Controller Power Input. Connect INA to a 3V to 5.5V supply.
8
COMPV
Boost Error Amplifier Compensation Connection. Connect a compensation network between COMPV to
GND.
9
FBP
Boost Converter Feedback Input. FBP is regulated to 1V. Connect FBP to the center of a resistive divid-
er connected between the boost output and GND.
10
N.C. No Connection. Not internally connected.
11
PGOOD Open-Drain Power-Good Output. Connect PGOOD to INA through an external pullup resistor.
Positive-Gate Voltage Regulator Power Input. Connect CP to the positive output of the external charge
12
CP
pump. Ensure that V_CP does not exceed the CP overvoltage threshold as given in the Electrical
Characteristics table.
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