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MAX856, MAX857, MAX858, MAX859
3.3V/5V or Adjustable Output, Step-Up DC-DC Converters
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Status
Active: In Production.
Description
The MAX856-MAX859 are high-efficiency, CMOS, step-up, DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX856/MAX858 accept a positive input voltage between 0.8V and VOUT and convert it to a higher, pin-selectable output voltage of 3.3V or 5V. The MAX857/MAX859 adjustable versions accept 0.8V to 6.0V input voltages and generate higher adjustable output voltages in the 2.7V to 6.0V range. Typical efficiencies are greater than 85%. Typical quiescent supply current is 25µA (1µA in shutdown).
The MAX856-MAX859 combine ultra-low quiescent supply current and high efficiency to give maximum battery life. An internal MOSFET power transistor permits high switching frequencies. This benefit, combined with internally set peak inductor current limits, permits the use of small, low-cost inductors. The MAX856/MAX857 have a 500mA peak inductor current limit. The MAX858/MAX859 have a 125mA peak inductor current limit.
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Data Sheet
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An evaluation kit is available: MAX856EVKIT
Key Features
- 0.8V to 6.0V Input Supply Voltage
- 0.8V Typ Start-Up Supply Voltage
- 85% Efficiency at 100mA
- 25µA Quiescent Current
- 1µA Shutdown Mode
- 125mA and 500mA Switch-Current Limits Permit Use of Low-Cost Inductors
- Up to 500kHz Switching Frequency
- ±1.5% Reference Tolerance Over Temperature
- Low-Battery Detector (LBI/LBO)
- 8-Pin SO and µMax Packages
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Applications/Uses
- 2-Cell and 3-Cell Battery-Operated Equipment
- 3.3V to 5V Step-Up Conversion
- Glucose Meters
- Medical Instrumentation
- Palmtop Computers
- Personal Data Communicators/Computers
- Portable Data-Collection Equipment
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Key Specifications:
| Step-Up 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 |
| MAX856 |
0.8 |
6 |
3.3 |
5 |
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0.15 |
0.15 |
Preset |
1 |
500 |
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15.6 |
$1.77 @1k |
| MAX857 |
2.7 |
6 |
- |
0.15 |
0.15 |
Resistor |
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$1.77 @1k |
| MAX858 |
3.3 |
5 |
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0.06 |
0.06 |
Preset |
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$1.77 @1k |
| MAX859 |
2.7 |
6 |
- |
0.06 |
0.06 |
Resistor |
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$1.77 @1k |
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See All Step-Up Switching Regulators (95)
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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
| Reliability Report: |
MAX856.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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Recommended Replacement |
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX859ESA
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Active |
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SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX859ESA+
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Active |
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SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX859ESA+T
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Active |
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N.SO;8 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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| MAX859ESA-T
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Active |
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N.SO;8 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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Similar Products by Function
Evaluation Kits
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Information Index
Document Ref.: 19-0211
Rev 4;
1996-05-01
This page last modified: 2007-05-30
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