MAX8840ELT25+T MAXIM [Maxim Integrated Products], MAX8840ELT25+T Datasheet

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MAX8840ELT25+T

Manufacturer Part Number
MAX8840ELT25+T
Description
Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in uDFN
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
The MAX8840/MAX8841/MAX8842 ultra-low-noise, low-
dropout (LDO) linear regulators are designed to deliver
up to 150mA continuous output current. These regula-
tors achieve a low 120mV dropout for 120mA load cur-
rent. The MAX8840 uses an advanced architecture to
achieve ultra-low output voltage noise of 11µV
PSRR of 54dB at 100kHz.
The MAX8841 does not require a bypass capacitor,
hence achieving the smallest PC board area. The
MAX8842 output voltage can be adjusted with an exter-
nal divider.
The MAX8840/MAX8841 are preset to a variety of volt-
ages in the 1.5V to 4.5V range. Designed with a p-channel
MOSFET series pass transistor, the MAX8840/MAX8841/
MAX8842 maintain very low ground current (40µA).
The regulators are designed and optimized to work with
low-value, low-cost ceramic capacitors. The MAX8840
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
The MAX8840/MAX8841/MAX8842 are available in a tiny
1.0mm x 1.5mm x 0.8mm µDFN.
19-0629; Rev 1; 1/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Typical Operating Circuits continued at end of data sheet.
ON
Cellular and Cordless Phones
PDA and Palmtop Computers
Base Stations
Bluetooth Portable Radios and Accessories
Wireless LANs
Digital Cameras
Personal Stereos
Portable and Battery-Powered Equipment
INPUT
2V TO 6V
1µF
C
IN
OFF
Typical Operating Circuits
Ultra-Low-Noise, High PSRR, Low-Dropout,
________________________________________________________________ Maxim Integrated Products
IN
SHDN
MAX8840
General Description
GND
OUT
BP
Applications
150mA Linear Regulators in µDFN
10nF
C
BP
OUTPUT PRESET
C
1µF
OUT
1.5V TO 4.5V
RMS
and
♦ Space-Saving 1.0mm x 1.5mm x 0.8mm µDFN
♦ 11µV
♦ 78dB PSRR at 1kHz (MAX8840)
♦ 120mV Dropout at 120mA Load
♦ Stable with 1µF Ceramic Capacitor for Any Load
♦ Guaranteed 150mA Output
♦ Only Need Input and Output Capacitors (MAX8841)
♦ Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,
♦ Low 40µA Ground Current
♦ Excellent Load/Line Transient
♦ Overcurrent and Thermal Protection
*xy is the output voltage code (see the Output Voltage Selector
Guide). Other versions between 1.5V and 4.5V are available in
100mV increments. Contact factory for other versions.
+Denotes lead-free package.
Output Voltage Selector Guide appears at end of data sheet.
MAX8840ELTxy+T
MAX8841ELTxy+T
MAX8842ELT+T
Bandwidth (MAX8840)
2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and
Adjustable (MAX8842)
PART*
TOP VIEW
RMS
Output Noise at 100Hz to 100kHz
SHDN
GND
IN
1
2
3
(1.5mm x 1.0mm)
Ordering Information
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
MAX8840
MAX8841
MAX8842
µDFN
Pin Configuration
6
5
4
OUT
N.C.
BP (MAX8840)
N.C. (MAX8841)
FB (MAX8842)
PIN-PACKAGE
6 µDFN-6
1.5mm x 1.0mm
6 µDFN-6
1.5mm x 1.0mm
6 µDFN-6
1.5mm x 1.0mm
Features
1

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MAX8840ELT25+T Summary of contents

Page 1

Rev 1; 1/07 Ultra-Low-Noise, High PSRR, Low-Dropout, General Description The MAX8840/MAX8841/MAX8842 ultra-low-noise, low- dropout (LDO) linear regulators are designed to deliver up to 150mA continuous output current. These regula- tors achieve a low 120mV dropout for 120mA load cur- ...

Page 2

Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFN ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +7V Output Short-Circuit Duration ............................................Infinite SHDN to GND ......................................-0.3V to (IN + 0.3V) OUT, FB, BP, N.C. to GND..................................-0.3V to (OUT + 0.3V) ...

Page 3

Ultra-Low-Noise, High PSRR, Low-Dropout, ELECTRICAL CHARACTERISTICS (continued 0.5V -40°C to +85°C, unless otherwise noted OUT A the MAX8842 is tested with 2.45V output, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Output Noise ...

Page 4

Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFN ( 0.5V 1µ 1µ OUT IN OUT MAX8440 DROPOUT VOLTAGE vs. LOAD CURRENT 200 180 160 T = +25°C A 140 T ...

Page 5

Ultra-Low-Noise, High PSRR, Low-Dropout 0.5V 1µ 1µ OUT IN OUT MAX8840 OUTPUT NOISE vs. BP CAPACITANCE CAPACITANCE (nF) MAX8840 LINE-TRANSIENT RESPONSE ...

Page 6

Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFN PIN MAX8840 MAX8841 MAX8842 — — — — Detailed Description The MAX8840/MAX8841/MAX8842 are ultra-low-noise, low-dropout, low-quiescent current linear regulators ...

Page 7

Ultra-Low-Noise, High PSRR, Low-Dropout, For design purposes, consider the current limit to be 150mA (min) to 300mA (max). The output can be shorted to ground for an indefinite amount of time without dam- aging the part. Thermal-Overload Protection Thermal-overload protection ...

Page 8

Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFN IN SHDN SHUTDOWN AND POWER-ON CONTROL MAX8840 MAX8841 MAX8842 THERMAL GND *MAX8840 ONLY **MAX8840/MAX8841 ONLY ***MAX8842 ONLY 8 _______________________________________________________________________________________ ERROR AMP 1.225V REFERENCE SENSOR AND NOISE BYPASS Functional Diagram MOS DRIVER ...

Page 9

... FB SHDN OFF GND Chip Information TRANSISTOR COUNT: 284 PROCESS: BiCMOS _______________________________________________________________________________________ 150mA Linear Regulators in µDFN Output Voltage Selector Guide PART MAX8840ELT16+T OUTPUT PRESET MAX8840ELT18+T 1.5V TO 4.5V MAX8840ELT19+T MAX8840ELT25+T MAX8840ELT26+T MAX8840ELT27+T C OUT 1µF MAX8840ELT28+T MAX8840ELT29+T MAX8840ELT30+T MAX8840ELT31+T MAX8840ELT33+T MAX8841ELT15+T OUTPUT ADJUSTABLE MAX8841ELT18+T 1.5V TO 4.5V MAX8841ELT25+T MAX8841ELT26+T ...

Page 10

Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFN (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) TABLE 1 Translation Table for Calendar Year Code ...

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