MAX15000, MAX15001 Current-Mode PWM Controllers with Programmable Switching Frequency

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The MAX15000/MAX15001 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX15000 is well suited for universal input (rectified 85VAC to 265VAC) or telecom (-36VDC to -72VDC) power supplies. The MAX15001 is well suited for low input voltage (9.5VDC to 24VDC) power supplies.

The MAX15000/MAX15001 contain an internal error amplifier that regulates the tertiary winding output voltage which 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 shutdown the MAX15000/MAX15001. Internal digital soft-start eliminates output voltage overshoot.

The MAX15000 has an internal bootstrap UVLO with large hysteresis that requires a minimum 23.6V for startup. The MAX15001 does not have the internal bootstrap UVLO and can be biased directly from a minimum voltage of 9.5V.

The switching frequency for the MAX15000/MAX15001 is programmable with an external resistor. The MAX15000A/MAX15001A provide a 50% maximum duty-cycle limit, while the MAX15000B/MAX15001B 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 +85°C temperature range.

Key Features

Applications/Uses

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 85VAC to 265VAC (MAX15000)
9.5V to 24V Input (MAX15001)
Digital Soft-Start
Internal Bootstrap UVLO With Large Hysteresis (MAX15000)
Internal Error Amplifier with 1.5% Accurate Reference
50µA (typ) Startup Supply Current
50% Maximum Duty-Cycle Limit (MAX15000A/MAX15001A)
75% Maximum Duty-Cycle Limit (MAX15000B/MAX15001B)
60ns Cycle-by-Cycle Current-Limit Propagation Delay
Available in Tiny 10-Pin µMAX Packages

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

Key Specifications: Isolated Power Supplies

Part Number

Application (Nominal Input Voltage)

V_IN (min) (V)

V_IN (max) (V)

Topology

Features

Control Loop

Feedback Type

Frequency (kHz)

Max. Duty Cycle (%)

Start-Up Current (max) (mA)

Operating Current, I_CC (max) (mA)

Gate Drive Current (A)

Current Sense Threshold (mV)

EV-Kit

RoHS Available

Package

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

Operating Temp. Range (°C)

Price^**

MAX15000

•	Networking (48V)

•	Power Over Ethernet (32-58V)

•	Universal Off-line (90-240VAC)

Flyback
Single-Ended Forward

•	Adjustable Frequency

•	High Voltage Start-Up Circuit

•	Internal Error Amplifier

•	Thermal Shutdown

•

UVLO

Current Mode

Primary Side

625

50
75

0.09

1,000

Yes

uMAX/10

-40 to +85

$0.93 @ 1k

MAX15001

•	Base Station (24V)

•	Industrial (24V)

9.5

$0.93 @ 1k

See All Isolated Power Supplies (29)

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.