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MAX1992, MAX1992ETG, MAX1993
Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages
Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages
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Status
| Part Number |
Status |
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MAX1992
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This product is No Longer Available. See Ordering Information for recommended replacements. |
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MAX1993
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Active: In Production. |
Description
The MAX1992/MAX1993 pulse-width modulation (PWM) controllers provide high-efficiency, excellent transient response, and high DC output accuracy. The devices step down high-voltage batteries to generate low-voltage CPU core or chipset/RAM supplies in notebook computers.
Maxim's proprietary Quick-PWM™ quick-response, constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients, while maintaining a relatively constant switching frequency. Efficiency is enhanced by the ability to drive very large synchronous-rectifier MOSFETs. Current sensing to ensure reliable overload and inductor saturation protection is available using an external current-sense resistor in series with the output. Alternatively, the controller can sense the current across the synchronous rectifier alone or use lossless inductor sensing for lowest power dissipation.
Single-stage buck conversion allows the MAX1992/MAX1993 to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down from another system supply rail instead of the battery) at the maximum switching frequency allows the minimum possible physical size.
The MAX1992 powers the CPU core, chipset, DRAM, or other supply rails as low as 0.7V. The MAX1993 powers chipsets and graphics processor cores, which require dynamically adjustable output voltages. The MAX1993 provides a tracking input that can be used for active termination buses. The MAX1992/MAX1993 are available in a 24-pin thin QFN package with optional overvoltage and undervoltage protection.
For dual step-down PWM controllers with inductor saturation protection, external reference input voltage, and dynamically selectable output voltages, refer to the MAX1540/MAX1541 data sheet.
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Data Sheet
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An evaluation kit is available: MAX1993EVKIT
Key Features
- Inductor Saturation Protection
- Accurate Current Limit
- Ultra-High Efficiency
- Quick-PWM with 100ns Load-Step Response
- MAX1992
- 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output Range
- MAX1993
- External Reference Input
- Dynamically Selectable Output Voltage (0.7V to 5.5V)
- Optional Power-Good and Fault Blanking During Transitions
- ±1% VOUT Accuracy Over Line and Load
- 2V to 28V Battery Input Range (VIN)
- 200/300/450/600kHz Switching Frequency
- Overvoltage/Undervoltage Protection Option
- 1.7ms Digital Soft-Start
- Drives Large Synchronous Rectifier FETs
- 2V ±0.7% Reference Output
- Power-Good Window Comparator
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Applications/Uses
- 1.8V and 2.5V Supplies
- Active Termination Buses (MAX1993)
- Core/IO Supplies as Low as 0.7V
- CPU/Chipset/GPU with Dynamic Voltage Cores
- DDR Memory Termination (MAX1993)
- 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 |
| MAX1993 |
2 |
28 |
0.7 |
5.5 |
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4 |
4 |
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1 |
300 |
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16.8 |
$3.25 @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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Recommended Replacement |
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1992ETG
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N/A |
No Longer Available |
MAX1993
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TQFN;24 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1992ETG+
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N/A |
No Longer Available |
MAX1993
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TQFN;24 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1992ETG+T
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N/A |
No Longer Available |
MAX1993
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TQFN;24 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1992ETG-T
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N/A |
No Longer Available |
MAX1993
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QFN;24 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1993ETG
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Active |
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TQFN;24 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1993ETG+
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Active |
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TQFN;24 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1993ETG+T
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Active |
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TQFN;24 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1993ETG-T
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Active |
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QFN;24 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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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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More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-2661
Rev 1;
2005-10-10
This page last modified: 2008-03-12
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