MAX8891 MAXIM [Maxim Integrated Products], MAX8891 Datasheet

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MAX8891

Manufacturer Part Number
MAX8891
Description
High PSRR, Low-Dropout, 150mA Linear Regulators
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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0
The MAX8891/MAX8892 low-dropout (LDO) linear regu-
lators are designed to deliver up to 150mA continuous
output current. These regulators achieve a low 120mV
dropout for 120mA load current.
The MAX8891 only requires an input/output capacitor,
hence achieving the smallest PCB area. The
MAX8892’s output voltage can be adjusted with an
external divider.
The MAX8891 is preset to a variety of voltages in the
1.5V to 4.5V range. Designed with a p-channel
MOSFET series pass transistor, the MAX8891/MAX8892
maintain very low ground current (40µA).
The regulators are designed and optimized to work with
low-value, low-cost ceramic capacitors. The MAX8891/
MAX8892 require only 1µF (typ) of output capacitance
for stability with any load. When disabled, current con-
sumption drops to below 1µA.
These regulators are available in a tiny 5-pin SC70
package.
19-4537; Rev 0; 3/09
Output Voltage Selector Guide appears at end of data sheet.
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.
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TOP VIEW
SHDN
GND
IN
________________________________________________________________ Maxim Integrated Products
1
2
3
+
General Description
MAX8891/
MAX8892
SC70
Pin Configuration
5
4
Applications
High PSRR, Low-Dropout, 150mA
OUT
N.C. (MAX8891)
FB (MAX8892)
♦ Space-Saving SC70 Package
♦ 65dB PSRR at 10kHz
♦ 120mV Dropout at 120mA Load
♦ Stable with 1µF Ceramic Capacitor for Any Load
♦ Guaranteed 150mA Output
♦ Only Need Input and Output Capacitors (MAX8891)
♦ 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 Output Voltage Selector
Guide). Other versions between 1.5V and 4.5V are available in
100mV increments. Contact factory for other versions.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
MAX8891EXKxy+T
MAX8892EXK+T
2.85V, 3V, 3.3V, 4.5V (MAX8891) and Adjustable
(MAX8892)
ON
ON
PART*
C
C
IN
IN
= 1µF
= 1µF
INPUT
2V TO 6V
INPUT
2V TO 6V
OFF
OFF
Linear Regulators
Typical Operating Circuits
IN
SHDN
IN
SHDN
MAX8891
MAX8892
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
Ordering Information
GND
GND
OUT
OUT
FB
C
OUT
OUTPUT ADJUSTABLE
= 1µF
OUTPUT PRESET
R1
R2
1.5V TO 4.5V
PIN-PACKAGE
5 SC70
5 SC70
1.5V TO 4.5V
Features
C
OUT
= 1µF
1

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MAX8891 Summary of contents

Page 1

... The MAX8891 only requires an input/output capacitor, hence achieving the smallest PCB area. The MAX8892’s output voltage can be adjusted with an external divider. The MAX8891 is preset to a variety of voltages in the 1.5V to 4.5V range. Designed with a p-channel MOSFET series pass transistor, the MAX8891/MAX8892 maintain very low ground current (40µA). ...

Page 2

High PSRR, Low-Dropout, 150mA Linear Regulators ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +7V Output Short-Circuit Duration.....................................Continuous OUT, SHDN to GND ......................................-0.3V to (IN + 0.3V) FB, BP, N.C. to GND..................................-0.3V to (OUT + 0.3V) Continuous Power Dissipation (T ...

Page 3

V + 0.5V 1µ 1µ OUT IN OUT OUTPUT VOLTAGE vs. INPUT VOLTAGE 3.0 2 0mA OUT 2.0 1 120mA OUT 1.0 0.5 0 ...

Page 4

... V SHDN 2V/div 3.5V V OUT 500mV/div 40μs/div REGION OF STABLE C ESR OUT vs. LOAD CURRENT STABLE REGION 100 125 150 LOAD CURRENT (mA) MAX8891/2 toc12 LOAD 25mA/div 10mA V IN 10mV/div V OUT 10mV/div MAX8891/2 toc15 R = 30Ω LOAD 500mV/div V ...

Page 5

... These devices can supply loads up to 150mA. As shown in the Functional Diagram , the MAX8891 consists of an innovative bandgap core, error amplifier, p-channel pass transistor, and internal feed- back voltage-divider. The MAX8892 allows for adjustable output with an external feedback network. ...

Page 6

... Thermal-overload protection is designed to protect the MAX8891/MAX8892 in the event of a fault condition. For continual operation, do not exceed the absolute maxi- mum junction temperature rating of T Operating Region and Power Dissipation ...

Page 7

... IN SHDN SHUTDOWN AND POWER-ON CONTROL MAX8891/ MAX8892 THERMAL SENSOR GND *MAX8891 ONLY **MAX8892 ONLY Output Voltage Selector Guide PART V (V) OUT MAX8891EXK15+T 1.5 MAX8891EXK18+T 1.8 MAX8891EXK25+T 2.5 MAX8891EXK26+T 2.6 MAX8891EXK28+T 2.8 MAX8891EXK29+T 2.85 MAX8891EXK89+T 2.9 MAX8891EXK31+T 3.1 MAX8891EXK33+T 3.3 MAX8891EXK45+T 4.5 MAX8892EXK+T Adjustable Note: Standard output voltage options, shown in bold, are available ...

Page 8

High PSRR, Low-Dropout, 150mA Linear Regulators For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 5 SC70 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. ...

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