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MAX1623
3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches
Industry's Smallest 3A DC-DC with Synchronous Rectifier
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Status
Active: In Production.
Description
The MAX1623 switch-mode buck regulator with synchronous rectification provides local CPU and bus-termination power in notebook and desktop computers. An internal 55mΩ (typ), 3A PMOS power switch and 60mΩ (typ), 3A NMOS synchronous-rectifier switch deliver continuous load currents up to 3A from a 5V supply with 95% typical efficiency. Output accuracy is ±1%, including line and load regulation.
The MAX1623 features constant-off-time, current-mode pulse-width-modulation (PWM) control with switching frequencies as high as 350kHz. An external resistor at the TOFF pin sets the off-time, allowing optimum design flexibility in terms of switching frequency, output switching noise, and inductor size. This device is available in a space-saving 20-pin SSOP package.
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Data Sheet
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An evaluation kit is available: MAX1623EVKIT
Key Features
- ±1% Output Accuracy, Including Line and Load Regulation
- 94% Efficiency
- Internal Switches
- 55mΩ PMOS Power Switch
- 60mΩ NMOS Synchronous-Rectifier Switch
- Guaranteed 3A Load Capability
- Minimal External Components
- Pin-Selectable Fixed 3.3V, 2.5V, or
Adjustable (1.1V to 3.8V) Output Voltage
- 4.5V to 5.5V Input Voltage Range
- 400µA (typ) Supply Current
- <1µA Shutdown Supply Current
- Constant-Off-Time PWM Operation
- Switching Frequencies Up to 350kHz
- Idle Mode™ Operation at Light Loads
- Thermal Shutdown Protection
- Available in 20-Pin SSOP
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Applications/Uses
- 5V to 3.3V Conversion
- CPU Daughter Card Supply
- Desktop Computer Bus-Termination Supply
- DSP Supply
- Notebook Computer CPU I/O Supply
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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 |
| MAX1623 |
4.5 |
5.5 |
1.1 |
3.8 |
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3 |
3 |
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1 |
350 |
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57.9 |
$5.15 @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
Application Notes
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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| MAX1623EAP
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Active |
SSOP;20 pin;57.9 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0094 (PDF)
Use pkgcode/variation: A20-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1623EAP+
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Active |
SSOP;20 pin;57.9 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0094 (PDF)
Use pkgcode/variation: A20+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1623EAP+T
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Active |
SSOP;20 pin;57.9 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0094 (PDF)
Use pkgcode/variation: A20+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1623EAP-T
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Active |
SSOP;20 pin;57.9 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0094 (PDF)
Use pkgcode/variation: A20-2*
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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
No external Schottky required. Constant off time, current-mode PWM operation. Lossless current sensing eliminates external current-sense resistor
Similar Products by Function
| MAX1636 |
Low-Voltage, Precision Step-Down Controller for Portable CPU Power |
| MAX1644 |
2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches |
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Similar Products by Application
| Computers: Desktops and Workstations > I/O Power |
Evaluation Kits
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Didn't Find What You Need?
Information Index
Document Ref.: 19-1436
Rev 2;
2002-08-02
This page last modified: 2007-07-23
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