MAX17595 Datasheet, PDF(1/29 Page) Maxim Integrated Products – Peak-Current-Mode Controllers for Flyback and Boost Regulators

19-6178; Rev 0; 1/12

EVALUATION KIT AVAILABLE

MAX17595/MAX17596/MAX17597

Peak-Current-Mode Controllers for

Flyback and Boost Regulators

General Description

The MAX17595/MAX17596/MAX17597 is a family of peak-

current-mode controllers which contain all the circuitry

required for the design of wide input-voltage flyback

and boost regulators. The MAX17595 offers optimized

input rising and falling thresholds for universal input

AC-DC converters and telecom DC-DC (36Vâ72V input

range) power supplies. The MAX17596 offers input rising

and falling thresholds suitable for low-voltage DC-DC

applications (4.5Vâ36V input range). The MAX17597

offers all circuitry needed to implement a boost converter

controller. All three controllers contain a built-in gate

driver for external n-channel MOSFETs.

The MAX17595/MAX17596/MAX17597 house an inter-

nal error amplifier with 1% accurate reference, useful

in implementations without the need for an external

reference. The switching frequency is programmable

from 100kHz to 1MHz with an accuracy of 8% using an

external resistor, allowing optimization of magnetic and

filter components, resulting in compact and cost-effective

power conversion solutions. For EMI sensitive applica-

tions, the MAX17595/MAX17596/MAX17597 family incor-

porates a programmable-frequency dithering scheme,

enabling low-EMI spread-spectrum operation.

An EN/UVLO input allows the user to start the

power supply precisely at the desired input voltage,

while also functioning as an on/off pin. The OVI pin

enables implementation of an input overvoltage protection

scheme, ensuring that the converter shuts down when

the DC input voltage exceeds a set maximum value. The

SS pin allows programmable soft-start time for the power

converter, and helps limit inrush current during startup.

The MAX17595/MAX17596/MAX17597 family also allows

the designer to choose between voltage soft-start and

current soft-start modes, useful in optoisolated designs.

A programmable slope compensation scheme is pro-

vided to enhance the stability of the peak-current-mode

control scheme.

Hiccup-mode overcurrent protection and thermal

shutdown are provided to minimize dissipation in

overcurrent and overtemperature fault conditions. The IC

is available in a space-saving 16-pin, 3mm x 3mm TQFN

package with 0.5mm lead spacing.

Benefits and Features

S Peak Current Mode Offline (Universal Input AC)

and Telecom (36Vâ72V) Flyback Controller

(MAX17595)

S Peak-Current-Mode DC-DC Flyback Controller

(4.5Vâ36V Input Range) (MAX17596)

S Peak-Current-Mode Nonsynchronous Boost PWM

Controller (4.5Vâ36V Input Range) (MAX17597)

S Current Mode Control Provides Excellent

Transient Response

S Low 20ÂµA Startup Supply Current

S 100kHz to 1MHz Programmable Switching

Frequency

S Programmable Frequency Dithering for Low-EMI

Spread-Spectrum Operation

S Switching Frequency Synchronization

S Adjustable Current Limit with External Current-

Sense Resistor

S Fast Cycle-By-Cycle Peak Current Limiting

S Hiccup-Mode Short-Circuit Protection

S Overtemperature Protection

S Programmable Soft-Start and Slope Compensation

S Programmable Voltage or Current Soft-Start

Schemes

S Input Overvoltage Protection

S Space-Saving, 3mm x 3mm TQFN Package

Applications

Universal Input Offline AC-DC Power Supplies

Wide-Range DC-Input Flyback/Boost Battery

Chargers

Battery-Powered Applications

Industrial, Telecom, and Automotive Applications

Ordering Information/Selector Guide appears at end of

data sheet.

For related parts and recommended products to use with this part,

refer to www.maxim-ic.com/MAX17595.related.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maximâs website at www.maxim-ic.com.

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