Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LDO voltage regulator Positivbe, adjustable TDFN 8 EP (2x2)

General Description

The MAX8902A/MAX8902B low-noise linear regulators

deliver up to 500mA of output current with only

16µV

RMS

of output noise in a 100kHz bandwidth. These

regulators maintain their output voltage over a wide

input range, requiring only 100mV of input-to-output

headroom at full load.

These LDOs maintain a low 80µA typical supply cur-

rent, independent of the load current and dropout volt-

age. The regulator control circuitry includes a

programmable soft-start circuit and short circuit,

reverse current, and thermal-overload protection. Other

features include an enable input and a power-OK out-

put (MAX8902B only).

The MAX8902A output voltage can be set to 1.5V, 1.8V,

2.0V, 2.5V, 3.0V, 3.1V, 3.3V, 4.6V, or 4.7V using the

SELA and SELB inputs. The MAX8902B output voltage

can be set between 0.6V and 5.3V with an external

resistor voltage-divider.

Applications

Notebook Computers

MP3 and Portable Media Players

Wireless Headphones

GPS Portable Navigation Devices

Smartphones

Features

o 1.7V to 5.5V Input Voltage Range

o 0.6V to 5.3V Output Voltage Range

o 16µV

RMS

Output Noise, 10Hz to 100kHz

o 80µA Operating Supply Current

o 92dB PSRR at 5kHz

o Guaranteed 500mA Output Current

o ±1.5% Output Accuracy Over Load, Line, and

Temperature

o 100mV (max) Dropout at 500mA Load

o < 1µA Shutdown Supply Current

o 700mA Short-Circuit Protection

o Thermal-Overload Protection

o Output-to-Input Reverse Current Protection

o 2mm x 2mm x 0.8mm TDFN Package

MAX8902A/MAX8902B

Low-Noise 500mA LDO Regulators

in a 2mm x 2mm TDFN Package

EVALUATION KIT AVAILABLE

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-0990; Rev 5; 10/12

Ordering Information

OUT

BYP

OFF

OUTPUT

4.6V

SELB

SELA

OUTS

GND

10μF

INPUT

4.7V TO 5.5V

0.01μF

10μF

MAX8902A

Typical Operating Circuits

PART FEATURES

TOP

MARK

MAX8902AATA+

Pin-selectable output

voltage

ABG

MAX8902BATA+ Adjustable output voltage ABH

MAX8902BATA/V+ Adjustable output voltage ADL

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

Note: All devices are in an 8-pin, 2mm x 2mm TDFN package

with an exposed paddle and operate over the -40°C to +125°C

automotive temperature range.

OUT

BYP

OFF

OUTPUT ADJUSTABLE

0.6V TO 5.3V

POK

GND

10μF

INPUT

1.7V TO 5.5V

0.01μF

10μF

MAX8902B

LOGIC

SUPPLY

100kΩ

TO μC

Pin Configurations appear at end of data sheet.

Summary of content (9 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package General Description The MAX8902A/MAX8902B low-noise linear regulators deliver up to 500mA of output current with only 16µVRMS of output noise in a 100kHz bandwidth. These regulators maintain their output voltage over a wide input range, requiring only 100mV of input-to-output headroom at full load. These LDOs maintain a low 80µA typical supply current, independent of the load current and dropout voltage.
PAGE 2
MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package ABSOLUTE MAXIMUM RATINGS BYP, EN, IN, OUT, SELA, SELB, POK to GND, GS to GND, FB, OUTS to GND .....................................................-0.3V to +6.0V Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) TDFN (derate 11.9mW/°C above +70°C)...................953.5mW Operating Temperature Range .........................
PAGE 3
MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package ELECTRICAL CHARACTERISTICS (continued) (VIN = VEN = 5V, OUTS = OUT, circuit of Figure 2 (MAX8902A) and Figure 3 (MAX8902B), TA = -40°C to +125°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX 80 120 160 +1 UNITS GND GND Supply Current I OUT = 0mA GND Shutdown Current VIN = 5.5V, EN = 0V TA < +85°C TA < +125°C TA = +25°C 0.001 TA = +85°C 0.
PAGE 4
MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package Typical Operating Characteristics (MAX8902A, VIN = 3.6V, VOUT = 2.5V, TA = +25°C, unless otherwise noted.) 80 60 40 2.504 2.503 2.502 20 2.501 0 2.500 2.510 200mA LOAD 2.508 2.506 OUTPUT VOLTAGE (V) 3.6V INPUT 2.505 OUTPUT VOLTAGE (V) 100 MAX8902A/02B toc02 2.506 MAX8902A/02B toc01 120 INPUT CURRENT (μA) LINE REGULATION LOAD REGULATION 140 MAX8902A/02B toc03 QUIESCENT CURRENT EN = HIGH, NO LOAD 2.504 2.502 2.
PAGE 5
MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package Pin Description PIN NAME FUNCTION MAX8902A MAX8902B 1 IN IN 2 GND GND 3 EN EN Enable Input. A logic-low drives the output low through a 3k resistor and reduces the supply current to less than 1μA. Drive logic-high or connect to IN for normal operation. SELA — Output Voltage Select Input. Connect SELA to GND, IN, or leave unconnected.
PAGE 6
MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package THERMAL PROTECTION IN CURRENT LIMIT EN REVERSE CURRENT PROTECTION CONTROL OUT BYP BYP GND REF 0.6V EA POK MAX8902A MAX8902B 0.54V FB MAX8902B ONLY OUTS MAX8902A ONLY SELA 990kΩ VOLTAGE SELECT SELB Figure 1.
PAGE 7
MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package 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.
PAGE 8
MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package INPUT 4.7V TO 5.5V INPUT 1.7V TO 5.5V OUTPUT 4.6V 10μF EN OFF OUT IN MAX8902A ON OUTPUT ADJUSTABLE 0.6V TO 5.3V OUT IN 0.01μF 10μF 10μF BYP MAX8902B ON OFF 10μF R1 EN FB LOGIC SUPPLY OUTS 0.01μF BYP R2 SELA R3 100kΩ SELB TO μC EP GS POK GND EP Figure 2. MAX8902A Fixed-Output Application Circuit Figure 3.
PAGE 9
MAX8902A/MAX8902B Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package Revision History REVISION NUMBER REVISION DATE 0 9/07 Initial release 1 1/08 Changed input capacitor value from 4.