MAX856, MAX857, MAX858, MAX859 3.3V/5V or Adjustable Output, Step-Up DC-DC Converters

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.

Key Features

Applications/Uses

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

	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

Key Specifications: Step-Up Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

Preset V_OUT (V)

I_OUT (A)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX856

0.8

3.3

0.15

Preset

0.06

500

•	Current Limit

•	Internal Power Switches

•	Low Battery/ Power OK Output

•

Shutdown

Yes

PDIP/8
SOIC/8
uMAX/8

Yes

-40 to +85
0 to +70

$1.60 @ 1k

MAX857

2.7

0.15

Resistor

$1.60 @ 1k

MAX858

3.3

0.06

Preset

$1.60 @ 1k

MAX859

2.7

0.06

Resistor

$1.60 @ 1k

See All Step-Up Switching Regulators (89)

Key Specifications: Switch-Mode DC-DC Power Supplies
Part Number	Topology	V_IN (min) (V)	V_IN (max) (V)	Number of DC-DC Outputs	Preset V_OUT (V)	Digital/VID Programmed Output	Min. Adjustable V_OUT (V)	Max. Adjustable V_OUT (V)	I_OUT (A)	Operating Current, I_CC (max) (mA)	Operating Freq. (kHz)	Internal Power Switch(es)	Package	Price^**
MAX856	Step-Up	0.8	6	1	3.3	No	-	-	0.15	0.06	500	Yes	PDIP/8 SOIC/8 uMAX/8	$1.60 @ 1k
MAX857					-		2.7	6	0.15					$1.60 @ 1k
MAX858					3.3		-	-	0.06					$1.60 @ 1k
MAX859					-		2.7	6	0.06					$1.60 @ 1k
See All Switch-Mode DC-DC Power Supplies (429)

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.

Ordering Information

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. More: SeeFull Data Sheet or Part 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.

Devices: 1-54 of 54

MAX856

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX856C/D

DICE SALES;

Use pkgcode/variation: DICE*

See data sheet

MAX856CPA

PDIP;8 pin;
Dwg: 21-0043D (PDF)
Use pkgcode/variation: P8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX856CSA

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX856CSA-T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX856CSA+T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX856CSA+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX856ESA+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX856ESA+T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX856ESA-T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX856ESA

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX856CUA+

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8+1*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX856CUA+T

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8+1*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX856CUA-T

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX856CUA

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX857

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX857C/D

DICE SALES;

Use pkgcode/variation: DICE*

See data sheet

MAX857CPA

PDIP;8 pin;
Dwg: 21-0043D (PDF)
Use pkgcode/variation: P8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX857EPA

PDIP;8 pin;
Dwg: 21-0043D (PDF)
Use pkgcode/variation: P8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX857CSA+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX857CSA+T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX857CSA-T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX857CSA

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX857ESA+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX857ESA+T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX857ESA

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX857ESA-T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX857CUA

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX857CUA-T

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX858

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX858C/D

DICE SALES;

Use pkgcode/variation: DICE*

See data sheet

MAX858CPA

PDIP;8 pin;
Dwg: 21-0043D (PDF)
Use pkgcode/variation: P8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX858EPA

PDIP;8 pin;
Dwg: 21-0043D (PDF)
Use pkgcode/variation: P8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX858CSA+T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX858CSA+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX858CSA

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX858CSA-T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX858ESA+T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX858ESA

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX858ESA-T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX858ESA+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX858CUA-T

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX858CUA

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX859

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX859C/D

DICE SALES;

Use pkgcode/variation: DICE*

See data sheet

MAX859CPA

PDIP;8 pin;
Dwg: 21-0043D (PDF)
Use pkgcode/variation: P8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX859CSA-T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX859CSA+T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX859CSA+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

0°C to +70°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX859CSA

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX859ESA+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX859ESA+T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX859ESA-T

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX859ESA

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX859CUA+T

0°C to +70°C

See data sheet

MAX859CUA+

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8+1*

0°C to +70°C

See data sheet
Materials Analysis

MAX859CUA-T

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

MAX859CUA

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8-1*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

Related Products

MAX1674, MAX1675, MAX1676 High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters