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MAX881R
Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PA
1mVP-P Output Voltage Ripple
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Status
Active: In Production.
Description
The MAX881R low-noise, inverting power supply is designed for biasing GaAsFET power amplifiers in portable wireless applications. This device is a chargepump 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 (-VIN + 0.6V). It can deliver up to 4mA. The internal linear regulator also filters the output to 1mVP-P ripple and noise.
Other features include a power-OK (active-low POK) output that signals 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 microcontroller or directly to a switch at the GaAsFET drain. The MAX881R is available in a 10-pin µMAX® package.
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Data Sheet
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An evaluation kit is available: MAX881REVKIT
Key Features
- Small µMAX Package
- 1mVP-P Output Voltage Ripple and Noise
- Power-OK Signal to Control GaAsFET Drain Switch
- 0.05µA Logic-Controlled Shutdown
- 1ms Guaranteed Startup
- 2.5V to 5.5V Input
- -0.5V to (-VIN + 0.6V) Output at up to 4mA
- Operates with One 4.7µF and Three 0.22µF Capacitors (no inductors needed)
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Applications/Uses
- Cell Phones Wireless Modems
- PCS Phones Two-Way Pagers
- PHS Phones Mobile Radios
- Wireless Handsets Wireless Computers
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Key Specifications:
| Charge Pumps |
| Part Number |
Topology |
VIN
(V) |
VIN
(V) |
ICC
(mA) |
Unadj. VOUT
(V) |
Adj. VOUT
(V) |
Adj. VOUT
(V) |
IOUT
(A) |
Oper. Freq.
(kHz) |
Oper. Temp.
(°C) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
max |
min |
max |
typ |
max w/pins |
See Notes |
| MAX881R |
|
2.5 |
5.5 |
0.95 |
-2 |
-VIN-0.6 |
-0.5 |
0.01 |
100 |
-40 to +85 |
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15.4 |
$1.85 @1k |
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See All Charge Pumps (45)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX881REUB
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX881REUB+
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX881REUB+T
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX881REUB-T
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Notes and Comments
Regulated output, low-noise
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Evaluation Kits
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Information Index
Document Ref.: 19-1372
Rev 2;
2004-06-02
This page last modified: 2007-06-11
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