MAX1830, MAX1831 3A, 1MHz, Low-Voltage, Step-Down Regulators with Synchronous Rectification and Internal Switches

Description

The MAX1830/MAX1831 constant-off-time, pulse-width-modulated (PWM) step-down DC-DC converters are ideal for use in 5V and 3.3V to low-voltage conversion necessary in notebook and subnotebook computers. These devices feature internal synchronous rectification for high efficiency and reduced component count. They require no external Schottky diode. The internal 45mΩ PMOS power switch and 55mΩ NMOS synchronous-rectifier switch easily deliver continuous load currents up to 3A. The MAX1830 produces preset +2.5V, +1.8V, or +1.5V output voltage or an adjustable output from +1.1V to V_IN. The MAX1831 produces preset +3.3V, +2.5V, and +1.5V output voltages and an adjustable output from +1.1V to V_IN. They achieve efficiencies as high as 94%.

The MAX1830/MAX1831 use a unique current-mode, constant-off-time, PWM control scheme, which includes Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, allowing the user to optimize performance trade- offs between efficiency, output switching noise, component size, and cost. Both devices are designed for continuous output currents up to 3A, an internal digital soft-start to limit surge currents during startup, a 100% duty cycle mode for low-dropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1µA.The MAX1830/MAX1831 are available in 16-pin QSOP packages.

For similar devices that provide continuous output currents of 1A to 3A, refer to the MAX1644, MAX1623, and MAX1742/MAX1842/MAX1843 data sheets.

Key Features

Applications/Uses

±1.5% Output Accuracy
94% Efficiency
Internal PMOS/NMOS Switches
- 45mΩ/55mΩ On-Resistance at V_IN = +4.5V
- 50mΩ/55mΩ On-Resistance at V_IN = +3V
Output Voltages
- +3.3V, +2.5V, or +1.5V Pin Selectable (MAX1831)
- +2.5V, +1.8V, or +1.5V Pin Selectable (MAX1830)
- +1.1V to V_IN Adjustable (Both Devices)
+3V to +5.5V Input Voltage Range
750µA (max) Operating Supply Current
<1µA Shutdown Supply Current
Programmable Constant-Off-Time Operation
Up to 1MHz Switching Frequency
Idle Mode Operation at Light Loads
Thermal Shutdown
Internal Digital Soft-Start Inrush Current Limiting
100% Duty Cycle During Low-Dropout Operation
Output Short-Circuit Protection
16-Pin QSOP Package

	5V or 3.3V to Low-Voltage Conversion
	Chipset Supplies
	CPU I/O Supplies
	Notebook and Subnotebook Computers

Key Specifications: Step-Down 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)

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX1830

5.5

1.1

5.5

1.5
1.8
2.5

Preset
Resistor

0.75

1000

QSOP/16

$4.59 @ 1k

MAX1831

1.5
2.5
3.3

$4.59 @ 1k

See All Step-Down Switching Regulators (252)

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.
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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: 1-8 of 8

MAX1830

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1830EEE

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-5*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1830EEE-T

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-5*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1830EEE+

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+5*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1830EEE+T

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+5*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1831

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1831EEE

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-5*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1831EEE-T

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-5*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1831EEE+

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+5*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1831EEE+T

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+5*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis