MAX881REUB-T Maxim Integrated Products, MAX881REUB-T Datasheet

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MAX881REUB-T

Manufacturer Part Number
MAX881REUB-T
Description
Charge Pumps Bias Supply w/Power OK for GaAsFET PA
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX881REUB-T

Function
Inverting
Output Voltage
- 4.9 V to - 0.5 V
Output Current
4 mA
Maximum Operating Temperature
+ 85 C
Package / Case
uMAX-10
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT

Available stocks

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Part Number
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Quantity
Price
Part Number:
MAX881REUB-T
Manufacturer:
STM
Quantity:
5 048
The MAX881R low-noise, inverting power supply is
designed for biasing GaAsFET power amplifiers in
portable wireless applications. This device is a charge-
pump inverter followed by a negative linear regulator.
The input voltage range is 2.5V to 5.5V. The output is
preset at -2.0V or can be set, using two resistors, to any
voltage from -0.5V to (-V
4mA. The internal linear regulator also filters the output
to 1mVp-p ripple and noise.
Other features include a power-OK (POK) output that sig-
nals when the negative voltage is within 7.5% of its set
point. It protects the GaAsFET by not allowing power to
be applied to the GaAsFET’s drain until it is properly
biased. The signal can be routed either to a microcon-
troller or directly to a switch at the GaAsFET drain. The
MAX881R is available in a 10-pin µMAX package.
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.
19-1372; Rev 2; 1/04
ON
2.5V TO 5.5V
INPUT
Cell Phones
PCS Phones
PHS Phones
Wireless Handsets
OFF
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
NEGOUT FB
IN
SHDN
C1+
C1-
General Description
MAX881R
IN
+ 0.6V). It can deliver up to
GND
OUT
POK
Wireless Modems
Two-Way Pagers
Mobile Radios
Wireless Computers
Applications
Low-Noise Bias Supply in µMAX
with Power-OK for GaAsFET PA
4mA, 1mVp-p
CONTROLS
GaAsFET PA’s
DRAIN SWITCH
-2V (OR ADJ)
OUTPUT
RIPPLE
♦ Small µMAX Package
♦ 1mVp-p Output Voltage Ripple and Noise
♦ Power-OK Signal to Control GaAsFET Drain
♦ 0.05µA Logic-Controlled Shutdown
♦ 1ms Guaranteed Startup
♦ 2.5V to 5.5V Input
♦ -0.5V to (-V
♦ Operates with One 4.7µF and Three 0.22µF
MAX881REUB
Switch
Capacitors (no inductors needed)
TOP VIEW
N.C. = NOT INTERNALLY CONNECTED
PART
NEGOUT
SHDN
IN
POK
C1+
C1-
+ 0.6V) Output at up to 4mA
1
2
3
4
5
-40°C to +85°C
TEMP RANGE
Ordering Information
MAX881R
MAX
Pin Configuration
10
9
8
7
6
10 µMAX
PIN-PACKAGE
IN
N.C.
GND
OUT
FB
Features
1

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MAX881REUB-T Summary of contents

Page 1

... Logic-Controlled Shutdown ♦ 1ms Guaranteed Startup ♦ 2.5V to 5.5V Input ♦ -0.5V to (-V ♦ Operates with One 4.7µF and Three 0.22µF Capacitors (no inductors needed) Applications PART MAX881REUB OUTPUT TOP VIEW -2V (OR ADJ) 4mA, 1mVp-p RIPPLE CONTROLS GaAsFET PA’s DRAIN SWITCH N ...

Page 2

Low-Noise Bias Supply in µMAX with Power-OK for GaAsFET PA ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +6V SHDN to GND...........................................................-0.3V to +6V POK to GND ...........................................................-0.3V to +12V C1+ to GND .................................................-0. C1-, NEGOUT, OUT, FB ...

Page 3

Figure 3.6V +25°C, unless otherwise noted OUTPUT VOLTAGE vs. OUTPUT CURRENT -1.84 CIRCUIT OF FIGURE 3a -1.86 -1.88 1.90 -1.92 -1.94 -1. 2.5V IN -1.98 -2.00 V 3.6V IN ...

Page 4

Low-Noise Bias Supply in µMAX with Power-OK for GaAsFET PA ( Circuit of Figure 3.6V +25°C, unless otherwise noted STARTUP FROM SHUTDOWN (NO LOAD) MAX881R-TOC10 +5V SHDN 0 V OUT 0 -2V POK ...

Page 5

... OUT Regulated Negative Output Voltage 8 GND Ground 9 N.C. No Connection. Not internally connected Positive Power-Supply Input Dual Mode is a trademark of Maxim Integrated Products. C1+ C1 C1- NEGOUT C2 0.5V Figure 1. Functional Diagram _______________________________________________________________________________________ Low-Noise Bias Supply in µMAX with Power-OK for GaAsFET PA FUNCTION SHDN CHARGE PUMP ...

Page 6

Low-Noise Bias Supply in µMAX with Power-OK for GaAsFET OUT GATE BIAS C4 MAX881R 100k POK POK Function Figure 2. Using the Detailed Description The MAX881R, a low-noise, inverting, regulated charge- pump power supply, is designed for ...

Page 7

OUT C1+ C1 0.22 F MAX881R C1 SHDN OFF NEGOUT POK C2 GND 0.22 F Figure 4. Adjustable Output Configuration Use capacitors with a low effective series resistance (ESR) to maintain a low dropout voltage ...

Page 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products 10 ...

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