MAX8902A datasheet(7/9 Pages) MAXIM

Part #	MAX8902A

Description	Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package

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The BYP capacitor value can be adjusted from 0.001µF

to 0.1µF to change the startup slew rate according to

the following formula:

Startup slew rate = (5V / ms) x (0.01µF / CBYP)

Note that this slew rate applies only at startup, and that

recovery from a short circuit occurs at a slew rate

approximately 500 times slower.

Also note that, being a low-frequency filter node, BYP is

sensitive to leakage. BYP leakage currents above 10nA

cause measurable inaccuracy at the output and should

be avoided.

Protection Features

The MAX8902A/MAX8902B are fully protected from an

output short circuit by a current-limiting and thermal-

overload circuit. If the output is shorted to GND, the

output current is limited to 700mA (typ). Under these

conditions, the part quickly heats up. When the junction

temperature reaches +165°C, a thermal-limit circuit

shuts off the output device. When the junction cools to

+150°C, the output turns back on in an attempt to

reestablish regulation. While the fault persists, the out-

put current cycles on and off, as the junction tempera-

ture slews between +150°C and +165°C.

The MAX8902A/MAX8902B are also protected against

reverse current when the output voltage is higher than

the input. In the event that extra output capacitance is

used at the output, a power-down transient at the input

would normally cause a large reverse current through a

conventional regulator. The MAX8902A/MAX8902B

include a reverse voltage detector that trips when IN

drops 10mV below OUT, shutting off the regulator and

opening the pMOS body diode connection, preventing

any reverse current.

Thermal Considerations

The MAX8902A/MAX8902B are packaged in an 8-pin,

2mm x 2mm TDFN package with an exposed paddle.

The exposed paddle is the main path for heat to leave

the IC, and therefore, must be connected to a ground

plane with thermal vias to allow heat to dissipate from

the device. Thermal properties of the IC package are

given in Table 1.

Selecting the Output Voltage (MAX8902A)

The MAX8902A output can be set to one of nine volt-

ages by shorting or opening the SELA and SELB

inputs, as shown in Table 2. SELA and SELB should be

connected to GND, IN, or left unconnected.

Alternatively, they may be driven high, low, or open with

external logic; however, the states of SELA and SELB

are sampled only at startup. The regulation voltage can

be set to a different level by cycling EN or IN momen-

tarily to GND.

Setting the Output Voltage (MAX8902B)

The MAX8902B uses external feedback resistors to set

the output regulation voltage as shown in Figure 3. The

output can be set from 0.6V to 5.3V. Set the lower feed-

back resistor (R2) to 120k

Ω or less to minimize FB input

bias current error. Then calculate the value of the upper

feedback resistor (R1) as follows:

where VFB is the feedback regulation voltage of 0.6V.

Power-OK (MAX8902B)

The MAX8902B includes an additional open-drain out-

put, POK, that pulls low to indicate the output voltage is

in regulation. During startup, POK is high impedance

until the output voltage rises to 91% of its regulation

level. If an overload occurs at the output, or the output

is shut down, POK is high impedance.

RR

V

OUT

FB

12

1

=×

−

⎛

⎝⎜

⎞

⎠⎟

MAX8902A/MAX8902B

Low-Noise 500mA LDO Regulators

in a 2mm x 2mm TDFN Package

Maxim Integrated

7

CONTINUOUS POWER

DISSIPATION

953.5mW DERATE 11.9mW/°C

ABOVE +70°C

JA*

83.9°C/W

JC

10.8°C/W

Table 1. 2mm x 2mm TDFN Package

Thermal Characteristics

OUTPUT VOLTAGE

(V)

SELA STATE

SELB STATE

1.5

IN

Unconnected

1.8

Unconnected

GND

2.0

Unconnected

IN

2.5

Unconnected

3.0

GND

3.1

GND

IN

3.3

GND

Unconnected

4.6

IN

GND

4.7

IN

Table 2. MAX8902A Output Voltages

*

θJA is specified according to the JESD51 standard with the

part mounted on a multilayer PCB.

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