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MAX16903

2.1MHz, High-Voltage, 1A Mini-Buck Converter

1A Automotive Buck Converter Integrates High- and Low-Side FETs and Uses Only 25µA Quiescent Current

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX16903 is a small, synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver 1A with input voltages from +3.5V to +28V while using only 25µA quiescent current at no load. Voltage quality can be monitored by observing the PGOOD signal. The MAX16903 can operate in dropout by running at 97% duty cycle, making it ideal for automotive and industrial applications.

The MAX16903 operates at a 2.1MHz frequency, allowing for small external components and reduced output ripple. It guarantees no AM band interference. SYNC input programmability enables three frequency modes for optimized performance: forced fixed-frequency operation, skip mode (ultra-low quiescent current of 25µA), and synchronization to an external clock. The MAX16903 can be ordered with spread-spectrum frequency modulation, designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX16903 is available in a thermally enhanced, 3mm x 3mm, 10-pin TDFN package or a 16-pin TSSOP package. The MAX16903 operates over the -40°C to +125°C automotive temperature range.

Data Sheet

Download	Rev 3	(PDF, 996kB)
E-Mail

An evaluation kit is available: MAX16903EVKIT

Key Features

Wide +3.5V to +28V Input Voltage Range
Tolerates Input Voltage Transients to +42V
1A Minimum Output Current with Overcurrent Protection
Fixed Output Voltages (+3.3V and +5V)
2.1MHz Switching Frequency with 3 Modes of Operation
- 25µA Ultra-Low Quiescent Current Skip Mode
- Forced Fixed-Frequency Operation
- External Frequency Synchronization
Optional Spread-Spectrum Frequency Modulation
Power-Good Output
Enable-Pin Compatible from +3.3V Logic Level to +42V
Thermal Shutdown Protection
-40°C to +125°C Automotive Temperature Range
10-Pin TDFN-EP or 16-Pin TSSOP-EP Packages
AEC-Q100 Qualified

Applications/Uses

Automotive
High-Voltage Input-Power DC-DC Applications
Industrial
Military

Key Specifications:

Step-Down Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Preset V_OUT
(V)

Max. I_OUT
(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

MAX16903

3.5

3.3

Preset

2100

TDFN-EP/10

TSSOP-EP/16

9.6

$2.96 @1k

See All Step-Down Switching Regulators (288)

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.

Diagram

Functional Diagram

Application Notes

Application Note 4944

Layout Guidelines Maximize Automotive Power-Supply Performance and Minimize Emissions

Product Guides

Automotive (PDF)

Reliability Reports

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Software/Models

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Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX16903RATB33/V+			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903RATB33/V+T			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903RATB50/V+T			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903RAUE33/V+			Active	TSSOP-EP;16 pin;33.2 mm² Outline Drawing:21-0108 (PDF) Land Pattern: 90-0120 (PDF) Use pkgcode/variation: U16E+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903RAUE33/V+T			Active	TSSOP-EP;16 pin;33.2 mm² Outline Drawing:21-0108 (PDF) Land Pattern: 90-0120 (PDF) Use pkgcode/variation: U16E+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903RAUE50/V+			Active	TSSOP-EP;16 pin;33.2 mm² Outline Drawing:21-0108 (PDF) Land Pattern: 90-0120 (PDF) Use pkgcode/variation: U16E+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903RAUE50/V+T			Active	TSSOP-EP;16 pin;33.2 mm² Outline Drawing:21-0108 (PDF) Land Pattern: 90-0120 (PDF) Use pkgcode/variation: U16E+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903SATB33/V+			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903SATB33/V+T			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903SATB50/V+			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX16903SATB50/V+T			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903SAUE33/V+			Active	TSSOP-EP;16 pin;33.2 mm² Outline Drawing:21-0108 (PDF) Land Pattern: 90-0120 (PDF) Use pkgcode/variation: U16E+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903SAUE33/V+T			Active	TSSOP-EP;16 pin;33.2 mm² Outline Drawing:21-0108 (PDF) Land Pattern: 90-0120 (PDF) Use pkgcode/variation: U16E+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903SAUE50/V+			Active	TSSOP-EP;16 pin;33.2 mm² Outline Drawing:21-0108 (PDF) Land Pattern: 90-0120 (PDF) Use pkgcode/variation: U16E+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16903SAUE50/V+T			Active	TSSOP-EP;16 pin;33.2 mm² Outline Drawing:21-0108 (PDF) Land Pattern: 90-0120 (PDF) Use pkgcode/variation: U16E+3*	-40°C to +125°C	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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Evaluation Kits

MAX16903EVKIT

Evaluation Kit for the MAX16903

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