MAX8841 MAXIM [Maxim Integrated Products], MAX8841 Datasheet

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MAX8841

Manufacturer Part Number
MAX8841
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
1mm x 1.5mm x 0.8mm µDFN.
19-0629; Rev 0; 10/06
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.
**Future product—contact factory for availability.
+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)
TOP VIEW
PART*
RMS
Output Noise at 100Hz to 100kHz
SHDN
GND
IN
1
2
3
(1.5mm x 1.0mm)
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Ordering Information
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

Related parts for MAX8841

MAX8841 Summary of contents

Page 1

... 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). ...

Page 2

... T = +25°C A SHDN = +85°C A MAX8840 f = 1kHz 10mA OUT MAX8841/MAX8842 MAX8840 f = 10kHz 10mA OUT MAX8841/MAX8842 MAX8840 f = 100kHz 10mA OUT MAX8841/ MAX8842 = 1µ 10nF. Typical values are at +25°C; BP MIN TYP MAX 150 150 200 300 80 170 120 ...

Page 3

... INPUT VOLTAGE (V) _______________________________________________________________________________________ 150mA Linear Regulators in µDFN = 1µ CONDITIONS MAX8840 f = 100Hz to 100kHz 10mA MAX8841/MAX8842 LOAD MAX8840 f = 100Hz to 100kHz 80mA MAX8841/MAX8842 LOAD R = 50Ω (Note 3) LOAD 6V, SHDN = +25° +85°C ...

Page 4

... INPUT VOLTAGE (V) MAX8840 GROUND PIN CURRENT vs. LOAD CURRENT 350 300 V = 5.5V IN 250 200 V = 3.8V IN 150 100 100 125 LOAD CURRENT (mA) MAX8841 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 10mA LOAD 0 0.01 0 100 FREQUENCY (kHz) 4 _______________________________________________________________________________________ Typical Operating Characteristics (continued) = 10nF +25° ...

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

... Typical Operating Characteristics). The MAX8840/MAX8841 are supplied with factory-set output voltages from 1.5V to 4.5V, in 100mV increments (see the Ordering Information). The MAX8842 features a user-adjustable output through an external feedback network (see the Typical Operating Circuits) ...

Page 7

... CA systems. The MAX8840 power-supply rejection is 78dB at 1kHz and 54dB at 100kHz. The MAX8841/MAX8842 PSRR is 72dB at 1kHz and 46dB at 100kHz (see the Power-Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics). When operating from sources other than batteries, ...

Page 8

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

Page 9

... MAX8841ELT15+T MAX8841ELT18+T 1.5V TO 4.5V MAX8841ELT25+T MAX8841ELT26+T R1 MAX8841ELT28+T MAX8841ELT29+T C OUT 1μF MAX8841ELT89+T R2 MAX8841ELT31+T MAX8841ELT33+T MAX8841ELT45+T MAX8842ELT+T (Note: Standard output voltage options, shown in bold, are available. Contact the factory for other output voltages between 1.5V and 4.5V. Minimum order quantity is 15,000 units.) TRANSISTOR COUNT: 284 PROCESS: BiCMOS ...

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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