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PDF MAX8902B Data sheet ( Hoja de datos )
| Número de pieza | MAX8902B | |
| Descripción | Low-Noise 500mA LDO Regulators | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0990; Rev 2; 2/08
EVAALVUAAILTAIOBNLEKIT
Low-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
www.datasheet4u.com
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 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
♦ 1.7V to 5.5V Input Voltage Range
♦ 0.6V to 5.3V Output Voltage Range
♦ 16µVRMS Output Noise, 10Hz to 100kHz
♦ 80µA Operating Supply Current
♦ 92dB PSRR at 5kHz
♦ Guaranteed 500mA Output Current
♦ ±1.5% Output Accuracy Over Load, Line, and
Temperature
♦ 100mV (max) Dropout at 500mA Load
♦ < 1µA Shutdown Supply Current
♦ 700mA Short-Circuit Protection
♦ Thermal-Overload Protection
♦ Output-to-Input Reverse Current Protection
♦ 2mm x 2mm x 0.8mm TDFN Package
Ordering Information
PART
FEATURES
TOP
PKG
MARK CODE
MAX8902AATA+
Pin-selectable output
voltage
ABG
T822-1
MAX8902BATA+
Adjustable output
voltage
ABH T822-1
+Denotes a lead-free, RoHS-compliant package.
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.
Typical Operating Circuits
INPUT
4.7V TO 5.5V
10μF
ON
IN OUT
MAX8902A
BYP
EN
OFF OUTS
SELA SELB
EP GND
OUTPUT
4.6V
0.01μF
10μF
INPUT
1.7V TO 5.5V
10μF
ON
LOGIC
SUPPLY
OFF
TO μC
R3
100kΩ
IN OUT
MAX8902B
BYP
EN
FB
POK
EP
GS
GND
OUTPUT ADJUSTABLE
0.6V TO 5.3V
0.01μF
R1
10μF
R2
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
1 page  
Low-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
www.datasheet4u.com
Pin Description
NAME
PIN
MAX8902A MAX8902B
FUNCTION
1 IN
IN Regulator Power Input. Connect IN to a supply from 1.7V to 5.5V. Bypass IN with a 10µF
ceramic capacitor to GND.
2 GND
GND
Ground
3 EN
EN
Enable Input. A logic-low drives the output low through a 3kΩ resistor and reduces the
supply current to less than 1µA. Drive logic-high or connect to IN for normal operation.
SELA
4
—
SELB
5
—
—
GS
—
POK
Output Voltage Select Input. Connect SELA to GND, IN, or leave unconnected. The states of
SELA and SELB are sampled when the regulator turns on and the output voltage is set as
shown in Table 2.
Internally Used. Connect GS to GND.
Output Voltage Select Input. Connect SELB to GND, IN, or leave unconnected. The states of
SELA and SELB are sampled when the regulator turns on and the output voltage is set as
shown in Table 2.
Power-OK Output. Open-drain output that goes low when the output is above 91% of the
nominal regulation voltage. POK is high impedance in shutdown or when the output is below
the regulation voltage.
OUTS
6
—
—
Output Sense Input. Connect OUTS to the load at a point where accurate regulation is
required, or connect OUTS directly to OUT.
FB
Feedback Input. Connect FB to the center of a resistor voltage-divider connected between
OUT and GND to set the output voltage. VFB regulates to 0.6V.
7 BYP
Bypass Input. Connect a 0.01µF ceramic capacitor from BYP to OUT to achieve 16µVRMS
BYP output noise. Adjust the value of this capacitor to control the output slew rate during startup.
Slew Rate = (5V / ms) x (0.01µF / CBYP)
8 OUT
— EP
OUT
EP
Regulator Output. Sources up to 500mA at the output regulation voltage. Bypass with a 10µF
(< 0.03Ω ESR) capacitor to GND.
Exposed Paddle. Connect the exposed paddle to a ground plane to provide heat sinking.
Detailed Description
The MAX8902A/MAX8902B low-noise, low-dropout lin-
ear regulators deliver up to 500mA of output current
with only 16µVRMS of output noise in a 100kHz band-
width. These regulators maintain their output voltage
over a wide input range, requiring only 100mV of input-
to-output headroom at full load.
The MAX8902 maintains 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
(POK) output (MAX8902B only). A simplified functional
diagram is shown in Figure 1.
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.
Enable (EN)
The MAX8902A/MAX8902B include an enable input,
EN. Pull EN low to shut down the output, or drive EN
high to enable the output. If shutdown is not needed,
connect EN to IN.
_______________________________________________________________________________________ 5
5 Page 
Low-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
www.datasheet4u.com
REVISION
NUMBER
0
1
2
REVISION
DATE
9/07
1/08
2/08
DESCRIPTION
Initial release
Changed input capacitor value from 4.7µF to 10µF.
Changed BP to BYP
Revision History
PAGES
CHANGED
—
1, 5, 8
2, 4–8
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
Boblet
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX8902B.PDF ] | |
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