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MAX16929
Automotive TFT-LCD Power Supply with Boost
Converter and Gate Voltage Regulators
1.8V/3.3V Regulator Controller
The 1.8V/3.3V regulator controller delivers 4.5mA (min)
to an external load. Connect FB to DR for a regulated
1.8V/3.3V output.
For higher output capability, use an external npn transis-
tor as shown in the Typical Application Circuit . The drive
capability of the regulator is then increased by the cur-
rent gain of the transistor (h FE ). When using an external
transistor, use DR as the base drive and connect FB to
the transistor’s emitter. Bypass the base to ground with a
0.1 F F ceramic capacitor.
If the boost output current is greater than 300mA, con-
nect a 30k I resistor between DR and GND.
Positive-Gate Voltage Regulator (GH)
The positive-gate voltage regulator includes a p-channel
FET output stage to generate a regulated output between
+5V and V CP - 2V. The regulator maintains accuracy over
wide line and load conditions. It is capable of at least
20mA of output current and includes current-limit protec-
tion. V GH is typically used to provide the TFT-LCD gate
drivers’ gate-on voltage.
The regulator derives its positive supply voltage from a
noninverting charge pump, a single-stage example of
which is shown in the Typical Application Circuit . A high-
er voltage using a multistage charge pump is possible,
as described in the Charge Pumps section.
Negative-Gate Voltage Regulator (GL)
The negative-gate voltage regulator is an analog gain
block with an open-drain p-channel output. It drives an
external npn pass transistor with a 6.8k I base-to-emitter
resistor (see the Pass Transistor Selection section). Its
guaranteed base drive source current is at least 2mA.
V GL is typically used to provide the TFT-LCD gate driv-
ers’ gate-off voltage.
The output of the negative-gate voltage regulator (i.e.,
the collector of the external npn pass transistor) has load-
Table 1. Supply Sequencing
CONTROL INPUTS
dependent bypassing requirements. Connect a ceramic
capacitor between the collector and ground with the
The regulator derives its negative supply voltage from an
inverting charge pump, a single-stage example of which
is shown in the Typical Application Circuit . A more nega-
tive voltage using a multistage charge pump is possible
as described in the Charge Pumps section .
The external npn transistor is not short-circuit protected.
To maintain proper pulldown capability of external npn
transistor and optimal regulation, a minimum load of at
least 500μA is recommended on the output of the GL
regulator.
Enable (ENP)
Use the enable input (ENP) to enable and disable the
boost section of the device. Connect ENP to INA for
normal operation and to GND to place the device in shut-
down. In shutdown, the INA supply current is reduced to
0.5 F A.
Soft-Start and Supply Sequencing (SEQ)
When enabled, the boost output ramps up from V INA to
its set voltage. Once the boost output reaches 85% of the
set voltage and the soft-start timer expires, the gate volt-
age regulators turn on in the order shown in Table 1 . The
1.8V/3.3V regulator controller is enabled at the beginning
of the boost converter’s soft-start.
Both gate voltage regulators have a 7.45ms soft-start
time. The second one turns on as soon as the output of
the first reaches 85% of its set voltage.
Thermal Shutdown
Internal thermal shutdown circuitry shuts down the
device immediately when the die temperature exceeds
+165 N C. A 15 N C thermal shutdown hysteresis prevents
the device from resuming normal operation until the die
temperature falls below +150 N C.
SUPPLY SEQUENCING
ENP
0
1
1
SEQ
X
0
1
FIRST
V SH
V SH
SECOND
Device is in shutdown
V GH
V GL
THIRD
V GL
V GH
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MAX16929FGUI/V+
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929FGUI/V+T
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929GGUI/V+
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929GGUI/V+T
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929GUI/V+
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929GUI/V+T
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929HGUI/V+
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929HGUI/V+T
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