The MAX8597/MAX8598/MAX8599 voltage-mode PWM
step-down controllers are designed to operate from a
4.5V to 28V input supply and generate output voltages
down to 0.6V. A proprietary switching algorithm stretches
the duty cycle to >99.5% for low-dropout design.
Unlike conventional step-down regulators using a pchannel
high-side MOSFET to achieve high duty cycle,
the MAX8597/MAX8598/MAX8599 drive n-channel
MOSFETs resulting in high efficiency and high-current-capability
designs.
The MAX8597 is available in a 20-pin thin QFN package
and is designed for applications that use an analog
signal to control the output voltage with an adjustable
offset, such as DC fan-speed control. This is achieved
with an internal uncommitted operational amplifier. The
MAX8597 is also targeted for tracking output-voltage
applications for chipsets, ASIC and DSP cores, and I/O
supplies. The MAX8598/MAX8599 are available in a 16-
pin thin QFN package and do not have the uncommitted
operational amplifier, reference input, and reference output,
but offer an open-drain, power-OK output.
The MAX8597/MAX8598/MAX8599 allow startup with
prebias voltage on the output for applications where a
backup supply or a tracking device may charge the
output capacitor before the MAX8597/MAX8598/
MAX8599 are enabled. In addition, the MAX8599 features
output overvoltage protection.
These controllers also feature lossless high-side peak
inductor current sensing, adjustable current limit, and
hiccup-mode short-circuit protection. Switching frequency
is set with an external resistor from 200kHz to
1.4MHz. This wide frequency range combined with a
wide-bandwidth error amplifier enables the loop compensation
scheme to give the user ample flexibility to
optimize for cost, size, and efficiency.
Key Features
Applications/Uses
Low Dropout with >99.5% Duty Cycle
Lossless High-Side Current Limit
Wide 4.5V to 28V Input Range
Dynamic Output Voltage Adjustment with
Adjustable Offset (MAX8597)
Remote Voltage Sensing for Both Positive and
Negative Rails (MAX8597)
Tracking Output Through REFIN (MAX8597)
Adjustable Switching Frequency from 200kHz to
1.4MHz
Adjustable Soft-Start
Prebias Startup
Enable and Power-OK (MAX8598/MAX8599) for
Flexible Sequencing
25MHz Error Amplifier
Adjustable Hiccup Current Limit for Output
Short-Circuit Protection
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.
* 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:
1-6
of
6
MAX8597
Free Sample
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX8597ETP+
THIN QFN;20 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T2044+3*
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