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MAX17499, MAX17500

Current-Mode PWM Controllers with Programmable Switching Frequency

Isolated/Nonisolated Current-Mode PWM Controllers in Tiny 10-Pin µMAX Packages with Adjustable Frequency from 12.5kHz to 625kHz

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
MAX17499	Active: In Production. See Ordering Information for details.
MAX17500	Active: In Production. See Ordering Information for details.

Description

The MAX17499/MAX17500 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX17499 is well suited for low input voltage (9.5V DC to 24V DC) power supplies. The MAX17500 is well suited for universal input (rectified 85V AC to 265V AC) or telecom (-36V DC to -72V DC) power supplies.

The ICs contain an internal error amplifier that regulates the tertiary winding output voltage that is used in primary-side-regulated isolated power supplies. Primary-side regulation eliminates the need for an optocoupler. An input undervoltage lockout (UVLO) is provided for programming the input-supply start voltage and to ensure proper operation during brownout conditions. An open-drain UVLO flag output, with 210μs internal delay, allows the sequencing of a secondary-side controller. The input-supply start voltage is externally programmable with a voltage-divider. A UVLO/EN input is used to shut down the devices. Internal digital soft-start eliminates output voltage overshoot.

The MAX17500 has an internal bootstrap UVLO with large hysteresis that requires a minimum 23.6V for startup. The MAX17499 does not have the internal bootstrap UVLO and can be biased directly from a minimum voltage of 9.5V.

The switching frequency for the ICs is programmable with an external resistor. The MAX17499A/MAX17500A provide a 50% maximum duty-cycle limit, while the MAX17499B/MAX17500B provide a 75% maximum duty-cycle limit. These devices are available in 10-pin µMAX® packages and are rated for operation over the -40°C to +125°C temperature range.

Data Sheet

Download	Rev 1	(PDF, 252kB)
E-Mail

Key Features

Current-Mode Control
Programmable Switching Frequency Up to 625kHz
Accurate UVLO Threshold (1%)
Open-Drain UVLO Flag Output with Internal Delay
36V to 72V Telecom Voltage Range
Universal Offline Input Voltage Range
- Rectified 85V AC to 265V AC (MAX17500)
9.5V to 24V Input (MAX17499)
Digital Soft-Start
Internal Bootstrap UVLO with Large Hysteresis (MAX17500)
Internal Error Amplifier with 1.5% Accurate Reference
50μA (typ) Startup Supply Current
50% Maximum Duty-Cycle Limit (MAX17499A/MAX17500A)
75% Maximum Duty-Cycle Limit (MAX17499B/MAX17500B)
60ns Cycle-by-Cycle Current-Limit Propagation Delay
Available in Tiny 10-Pin µMAX Packages

Applications/Uses

1/2, 1/4, and 1/8 Brick Power Modules
12V Boost and SEPIC Regulators
High-Efficiency, Isolated Telecom Power Supplies
Industrial Power Conversion
Isolated and Nonisolated High-Brightness LED
Isolated Keep-Alive Power Supplies
Networking/Servers
Power Supplies

Key Specifications:

Isolated Power Supplies

Part Number

Application (V_IN)

V_IN
(V)

Topology

Feedback

Freq.
(kHz)

Duty Cycle
(%)

I_STARTUP
(mA)

I_CC
(mA)

Gate Drive Current
(A)

Oper. Temp.
(°C)

Budgetary Price

min

max

min

max

See Notes

MAX17500

Networking (48V)

Power Over Ethernet (32-58V)

Telecom (36-72V)

Universal Off-line (90-240VAC)

21.6

375

Flyback

Linear

Opto

Primary Side

625

0.09

-40 to +125

$1.04 @1k

See All Isolated Power Supplies (26)

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.

Step-Up Switching Regulators

Part Number

V_IN
(V)

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

MAX17499

9.5

1.23

400

Resistor

625

µMAX/10

15.4

$1.04 @1k

See All Step-Up Switching Regulators (95)

Diagram

Typical Application Circuit

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	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX17499AAUB+			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17499AAUB+T			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17499AEUB+		N/A	No Longer Available	MAX17499AAUB+	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17499AEUB+T		N/A	No Longer Available	MAX17499AAUB+	uMAX; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX17499BAUB+			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17499BAUB+T			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17499BEUB+		N/A	No Longer Available	MAX17499BAUB+	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17499BEUB+T		N/A	No Longer Available	MAX17499BAUB+	uMAX; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX17500AAUB+			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17500AAUB+T			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX17500AEUB+		N/A	No Longer Available	MAX17500AAUB+	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17500AEUB+T		N/A	No Longer Available	MAX17500AAUB+	uMAX; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX17500BAUB+			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17500BAUB+T			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17500BEUB+		N/A	No Longer Available	MAX17500BAUB+	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17500BEUB+T		N/A	No Longer Available	MAX17500BAUB+	uMAX; Land Pattern: Not Available	-40°C to +85°C	See data sheet

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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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-5485 Rev 1; 2011-08-08
This page last modified: 2011-08-22