MAX1530 datasheet(20/33 Pages) MAXIM

Part #	MAX1530

Description	Multiple-Output Power-Supply Controllers for LCD Monitors

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Manufacturer	MAXIM [Maxim Integrated Products]

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Multiple-Output Power-Supply Controllers for

LCD Monitors

20

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LR2 is typically used to generate the TFT LCD gamma

reference voltage, which is usually 0.3V below the

source drive supply voltage.

LR2 is enabled when the step-down regulator is

enabled and the voltage on ONL2 exceeds ONL2 input

threshold (1.238V typ). (See the Startup Sequence

(ONL_,SEQ) section.) Each time it is enabled, the con-

troller goes through a soft-start routine that ramps up its

internal reference DAC. (See the Soft-Start section).

Linear Regulator Controller (LR3)

LR3 is an analog gain block with an open-drain N-

channel output. It drives an external PNP pass transis-

tor with a 6.8k

Ω base-to-emitter resistor. Its guaranteed

base drive sink current is at least 2mA. The regulator,

including Q3 in Figure 1, uses a 0.47µF output capaci-

tor and is designed to deliver 20mA at 25V. The regula-

tor including Q3 in Figure 2 uses a 4.7µF output

capacitor and is designed to deliver 500mA at 10V.

For the MAX1531 (Figure 1), LR3 is typically used to gen-

erate the TFT LCD gate driver’s gate-on voltage. A suffi-

cient input voltage can be produced using a

charge-pump circuit as shown in Figure 1. Note that the

voltage rating of the DRV3 output is 28V. If higher volt-

ages are present, an external cascode NPN transistor

(Q6) should be used with the emitter connected to

DRV3, the base to VIN (which is the connection point of

C1 and R12 in Figure 1), and the collector to the base of

the PNP pass transistor (Figure 1). For the MAX1530

(Figure 2), LR3 is typically used to generate the TFT LCD

source drive supply voltage. The input for this regulator

can come directly from the input supply, be produced

from an external step-up regulator, or from an extra wind-

ing coupled to the main step-down regulator inductor.

LR3 is enabled when the step-down regulator is

enabled and the voltage on ONL3 exceeds the ONL3

input threshold (1.238V typ). (See the Startup Sequence

(ONL_,SEQ) section.) Each time it is enabled, the con-

troller goes through a soft-start routine that ramps up its

internal reference DAC. (See the Soft-Start section.)

Source Drive Regulator Controller (LR4)

(MAX1531 Only)

LR4 is an analog gain block with an open-drain N-

channel output. It drives an external PNP pass transis-

tor with a 1.5k

Ω base-to-emitter resistor. Its guaranteed

base drive sink current is at least 10mA. The regulator

including Q4 in Figure 1 uses a 4.7µF output capacitor

and is designed to deliver 500mA at 10V. The regula-

tor’s fast transient response allows it to handle brief

peak currents up to 2A.

LR4 is typically used to generate the TFT LCD source

drive supply voltage. The input for this regulator can

come directly from the input supply, be produced from

an external step-up regulator, or from an extra winding

coupled to the main step-down regulator inductor.

LR4 is enabled when the step-down regulator is

enabled and the voltage on ONL4 exceeds the ONL4

input threshold (1.238V typ). (See the Startup

Sequence (ONL_,SEQ) section.) Each time it is

enabled, the regulator goes through a soft-start routine

that ramps up its internal reference DAC from 0V to

1.238V (typ). (See the Soft-Start section.)

The standard application circuit in Figure 1 powers the

LR4 regulator directly from the input supply and uses

the MAX1531’s general-purpose overcurrent protection

function to protect the input supply from excessive load

currents. (See the Overcurrent Protection section.)

Gate-Off Regulator Controller (LR5) (MAX1531 Only)

LR5 is an analog gain block with an open-drain P-chan-

nel output. It drives an external NPN pass transistor

with a 6.8k

Ω base-to-emitter resistor. Its guaranteed

base drive sink current is at least 2mA. The regulator

including Q5 in Figure 1 uses a 0.47µF output capacitor

and is designed to deliver 10mA at -10V.

LR5 is typically used to generate the TFT LCD gate dri-

ver’s gate-off voltage. A negative input voltage can be

produced using a charge-pump circuit as shown in

Figure 1. Use as many stages as necessary to obtain

the required output voltage.

LR5 is enabled when the step-down regulator is

enabled and the voltage on ONL5 exceeds the ONL5

input threshold (1.238V typ). (See the Startup

Sequence (ONL_,SEQ) section.) Each time it is

enabled, the regulator goes through a soft-start routine

that ramps down its internal reference DAC from VL to

125mV (typ). (See the Soft-Start section.)

Internal 5V Linear Regulator (VL)

All MAX1530/MAX1531 functions, except the thermal

sensor, are internally powered from the on-chip, low-

dropout 5V regulator. The maximum regulator input

voltage (VIN) is 28V. Bypass the regulator’s output (VL)

with at least a 1µF ceramic capacitor to AGND. The

VIN-to-VL dropout voltage is typically 200mV, so when

VIN is less than 5.2V, VL is typically VIN - 200mV. The

internal linear regulator can source up to 30mA to sup-

ply the device, power the low-side gate driver, charge

the external boost capacitor, and supply small external

loads. When driving particularly large MOSFETs, little or

no regulator current may be available for external

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