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MAX1762, MAX1791
High-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks
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Status
Active: In Production.
Description
The MAX1762/MAX1791 PWM step-down controllers provide high efficiency, excellent transient response, and high DC output accuracy needed for stepping down, high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in notebook computers and PDAs.
Maxim's proprietary Quick-PWM™ pulse-width modulator is a free-running constant on-time type with input feed-forward. Its high operating frequency (300kHz) allows small external components to be utilized in PC board area-critical applications such as subnotebook computers and smart phones. PWM operation occurs at heavy loads, and automatic switchover to pulse-skipping operation occurs at lighter loads. The external high-side p-channel and low-side n-channel MOSFETs require no bootstrap components. The MAX1762/MAX1791 are simple, easy to compensate, and do not have the noise sensitivity of conventional fixed-frequency current-mode PWMs.
These devices achieve high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by their ability to drive synchronous-rectifier MOSFETs. The MAX1762/MAX1791 come in a 10-pin µMAX® package and offer two fixed voltages (Dual Mode™) for each device, 1.8V/2.5V/adj (MAX1762) and 3.3V/5.0V/adj (MAX1791).
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Data Sheet
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An evaluation kit is available: MAX1791EVKIT
Key Features
- High Operating Frequency (300kHz)
- No Current-Sense Resistor
- Accurate Current Limit
- ±1% Total DC Error over Line and During Continuous Conduction
- Dual Mode Fixed Output
- 1.8V/2.5V/adj (MAX1762)
- 3.3V/5.0V/adj (MAX1791)
- 0.5V to 5.5V Output Adjust Range
- 5V to 20V Input Range
- Automatic Light-Load Pulse Skipping Operation
- Free-Running On-Demand PWM
- Foldback Mode™ UVLO
- PFET/NFET Synchronous Buck
- 4.65V at 25mA Linear Regulator Output
- 5µA Shutdown Supply Current
- 230µA Quiescent Supply Current
- 10-Pin µMAX Package
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Applications/Uses
- 2-Way Pagers
- Analog Cellular Phones
- Digital Cellular Phones
- Digital Still Cameras
- Notebook Computers
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Preset VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX1762 |
5 |
20 |
0.5 |
5.5 |
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2 |
2 |
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1 |
300 |
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15.4 |
$2.48 @1k |
| MAX1791 |
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$2.48 @1k |
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See All Step-Down Switching Regulators (284)
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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
| Show FIT data for: |
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| Request Reliability Report for: |
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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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| MAX1762EUB
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10CN-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1762EUB+
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10CN+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1762EUB+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: U10CN+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1762EUB-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: U10CN-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1791EUB
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10CN-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1791EUB+
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10CN+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1791EUB+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: U10CN+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1791EUB-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: U10CN-1*
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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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Information Index
Document Ref.: 19-1923
Rev 1;
2006-05-16
This page last modified: 2007-06-14
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