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MAX798
High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power
High-Efficiency Over Wide Load Range
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Status
Active: In Production.
Description
The MAX798 high-performance, step-down DC-DC converter provides main CPU power in battery-powered systems. This buck controller achieves 96% efficiency by using synchronous rectification and Maxim's proprietary Idle Mode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. The MAX798's high accuracy meets the demanding requirements of the latest-generation CPUs. Excellent dynamic response corrects output transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost and eliminating the crowbar switching currents found in some PMOS/NMOS switch designs.
The MAX798 has a logic-controlled and synchronizable fixed-frequency pulse-width-modulating (PWM) operating mode, which reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. The SKIP override input allows automatic switchover to idle-mode operation (for high-efficiency pulse skipping) at light loads, or forces fixed-frequency mode for lowest noise at all loads.
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Data Sheet
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Key Features
- 96% Efficiency
- 4.5V to 30V Input Range
- 1.6V to 6V Adjustable Precision Output
- ±0.4% Max Total Load-Regulation Error
- 0.06%/V Max Line-Regulation Error
- 5V Linear-Regulator Output
- Precision 2.505V Reference Output
- Automatic Bootstrap Circuit
- 150kHz/300kHz Fixed-Frequency PWM Operation
- Programmable Soft-Start
- 1.2mA Typical Quiescent Current (VIN = 12V, VOUT = 2.5V)
- 1µA Typical Shutdown Current
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Applications/Uses
- Notebook and Subnotebook Computers
- PDAs and Mobile Communicators
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
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 |
| MAX798 |
4.5 |
30 |
1.6 |
6 |
10 |
Resistor |
1 |
340 |
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61.9 |
$5.58 @1k |
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See All Step-Down Switching Regulators (288)
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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
Product Guides
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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| MAX798ESE
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Active |
SOIC(N);16 pin;61.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0097 (PDF)
Use pkgcode/variation: S16-5*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX798ESE+
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Active |
SOIC(N);16 pin;61.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0097 (PDF)
Use pkgcode/variation: S16+5*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX798ESE+T
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Active |
SOIC(N);16 pin;61.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0097 (PDF)
Use pkgcode/variation: S16+5*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX798ESE-T
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Active |
SOIC(N);16 pin;61.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0097 (PDF)
Use pkgcode/variation: S16-5*
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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
Inverting, CUK and boost topologies are also supported due to flexible design of floating high-speed gate driver
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Information Index
Document Ref.: 19-1175
Rev 0;
1996-12-01
This page last modified: 2010-05-10
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