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MAX17003A, MAX17004A
High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook Computers
Fixed-Frequency with Optimal Interleaving Minimizes Input Ripple Current from the Lowest Input Voltages Up to 26V
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Status
Active: In Production.
Description
The MAX17003A/MAX17004A are dual step-down, switch-mode, power-supply (SMPS) controllers with synchronous rectification, intended for main 5V/3.3V power generation in battery-powered systems. Fixed-frequency operation with optimal interleaving minimizes input ripple current from the lowest input voltages up to the 26V maximum input. Optimal 40/60 interleaving allows the input voltage to go down to 8.3V before duty-cycle overlap occurs, compared to 180° out-of-phase regulators where the duty-cycle overlap occurs when the input drops below 10V.
Output current sensing provides peak current-limit protection, using either an accurate sense resistor or using lossless inductor DCR current sensing. A low-noise mode maintains high light-load efficiency while keeping the switching frequency out of the audible range.
An internal, fixed 5V, 100mA linear regulator powers up the MAX17003A/MAX17004A and their gate drivers, as well as external keep-alive loads. When the main PWM regulator is in regulation, an automatic bootstrap switch bypasses the internal linear regulator, providing current up to 200mA. An additional adjustable linear-regulator driver with an external pnp transistor can be used with a secondary winding to provide a 12V supply, or powered directly from the main outputs to generate low-voltage outputs as low as 1V.
Independent enable controls and power-good signals allow flexible power sequencing. Voltage soft-start gradually ramps up the output voltage and reduces inrush current, while soft-discharge gradually decrease the output voltage, preventing negative voltage dips. The MAX17003A/MAX17004A feature output undervoltage and thermal-fault protection. The MAX17003A also includes output overvoltage-fault protection.
The MAX17003A/MAX17004A are available in a 32-pin, 5mm x 5mm thin QFN package. The exposed backside pad improves thermal characteristics for demanding linear keep-alive applications.
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Data Sheet
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Key Features
- Fixed-Frequency, Current-Mode Control
- 40/60 Optimal Interleaving
- Internal BST Switches
- Internal 5V, 100mA Linear Regulator
- Auxiliary Linear-Regulator Driver (12V or Adjustable Down to 1V)
- Dual Mode™ Feedback—3.3V/5V Fixed or Adjustable Output Voltages
- 200kHz/300kHz/500kHz Switching Frequency
- Undervoltage and Thermal-Fault Protection
- Overvoltage-Fault Protection (MAX17003A Only)
- 6V to 26V Input Range
- 2V ±0.75% Reference Output
- Independent Enable Inputs and Power-Good Outputs
- Soft-Start and Soft-Discharge (Voltage Ramp)
- 8µA (typ) Shutdown Current
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Applications/Uses
- 2 to 4 Li+ Cell Battery-Powered Devices
- Main Power Supplies
- 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) |
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 |
| MAX17003A |
5.5 |
26 |
2 |
5.5 |
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6 |
6 |
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2 |
500 |
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26 |
$5.16 @1k |
| MAX17004A |
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- |
- |
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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
Standard Application Circuit
Reliability Reports
| Reliability Report: |
MAX17003A.pdf |
| 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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| MAX17003AETJ+
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Active |
TQFN;32 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX17003AETJ+T
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Active |
TQFN;32 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
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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Similar Products by Function
Products with Similar Part Numbers
| MAX17003, MAX17004 |
High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook Computers |
Didn't Find What You Need?
Information Index
Document Ref.: 19-0837
Rev 0;
2008-03-03
This page last modified: 2011-08-16
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