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MAX8640Y, MAX8640Z
Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters
Smallest 2mm x 2.1mm SC70 Package, the Industry's Smallest Total Solution Size, and Most Robust 4MHz/2MHz Step-Down DC-DC Converters on the Market that Can Deliver 500mA with Over 93% Efficiency
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Status
Active: In Production.
Description
The MAX8640Y/MAX8640Z step-down converters are
optimized for applications where small size, high efficiency,
and low output ripple are priorities. They utilize
a proprietary PWM control scheme that optimizes the
switching frequency for high efficiency with small external
components and maintains low output ripple voltage
at all loads. The MAX8640Z switches at up to
4MHz to allow a tiny 1µH inductor and 2.2µF output
capacitor. The MAX8640Y switches at up to 2MHz for
higher efficiency while still allowing small 2.2µH and
4.7µF components. Output current is guaranteed up to
500mA, while typical quiescent current is 28µA.
Factory-preset output voltages from 0.8V to 2.5V eliminate
external feedback components.
Internal synchronous rectification greatly improves efficiency
and replaces the external Schottky diode required in conventional step-down converters. Internal fast soft-start eliminates inrush current so as to reduce
input capacitor requirements.
The MAX8640Y/MAX8640Z are available in the tiny 6-pin, SC70 (2.0mm x 2.1mm) and µDFN (1.5mm x 1.0mm) packages. Both packages are lead-free.
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Data Sheet
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An evaluation kit is available: MAX8640EVKIT
Key Features
- Tiny SC70 and µDFN Packages
- 500mA Guaranteed Output Current
- 4MHz or 2MHz PWM Switching Frequency
- Tiny External Components: 1µH/2.2µF or 2.2µH/4.7µF
- 28µA Quiescent Current
- Factory Preset Outputs from 0.8V to 2.5V
- ±1% Initial Accuracy
- Low Output Ripple at All Loads
- Ultrasonic Skip Mode Down to 1mA Loads
- Ultra-Fast Line- and Load-Transient Response
- Fast Soft-Start Eliminates Inrush Current
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Applications/Uses
- Cell Phones, PDAs, DSCs, MP3s
- I/O Power
- Microprocessor/DSP Core Power
- Other Handhelds Where Space Is Limited
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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) |
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 |
| MAX8640Y |
2.7 |
5.5 |
1 |
2.5 |
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0.5 |
Preset |
1 |
2000 |
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1.6 |
$2.00 @1k |
| MAX8640Z |
1.1 |
1.8 |
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4000 |
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$2.00 @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
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-3997
Rev 4;
2009-03-16
This page last modified: 2009-03-16
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