MAX5096, MAX5097 40V, 600mA Buck Converters with Low-Quiescent-Current Linear Regulator Mode

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The MAX5096/MAX5097 easy-to-use, Dual Mode™, DC-DC converters operate as LDO (low dropout) or switch-mode buck converters. At a high output load, the converters operate as high-efficiency pulse-width-modulated (PWM) switch-mode converters and reduce the power dissipation. The devices switch to a low-quiescent-current (I_Q) LDO mode of operation at light load. During the key-off condition, the system's microcontroller drives the LDO/active-low BUCK input on the fly and forces the MAX5096/MAX5097 into LDO Mode, thereby reducing the quiescent current significantly.

In Buck Mode, the MAX5096/MAX5097 operate from a 5V to 40V input voltage range and deliver up to 600mA of load current with excellent load and line regulation. The fixed-switching frequency versions of 135kHz and 330kHz are available. The MAX5096/MAX5097 DC-DC internal oscillator can be synchronized to an external clock. External compensation and a current-mode control scheme make it easy to design with.

In LDO Mode, the MAX5096/MAX5097 operate from a 4V to 40V input voltage. The LDO Mode operation is intended for a lower output load current of up to 100mA. The quiescent current at 100µA load in LDO Mode is only 41µA (typ).

The MAX5096/MAX5097 feature an enable input that shuts down the device, reducing the current consumption to 6µA (typ). Additional features include a power-on reset output with a capacitor-adjustable timeout period, programmable soft-start, output tracking, output overload, short-circuit and thermal shutdown protections.

The MAX5096/MAX5097 operate over the -40°C to +125°C automotive temperature range and are available in thermally enhanced 20-pin TSSOP or 16-pin TQFN packages.

Key Features

Applications/Uses

High-Efficiency Switcher Mode (Buck Mode) or Low-Quiescent-Current Linear Regulator (LDO Mode) Operation
Wide Operating Input Voltage Range
- +5V to +40V Buck Mode
- +4V to +40V LDO Mode
Fixed 3.3V or 5V and Adjustable (1.24V to 11V) Output Voltage Versions
6µA (typ) Shutdown Current
Fixed 135kHz or 330kHz Switching Frequency
External Frequency Synchronization
Programmable Soft-Start
Integrated Microprocessor Reset (Active-Low RESET) Circuit with Programmable Timeout Period
Thermal and Short-Circuit Protection
-40°C to +125°C Automotive Temperature Range
Thermally-Enhanced Package Dissipates
- 2.6W at T_A = +70°C (16-Pin TQFN)
- 1.7W at T_A = +70°C (20-Pin TSSOP)

	Automotive
	Home Security/Safety

Key Specifications: Step-Down Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

Preset V_OUT (V)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Number of LDO/Op Amp Outputs

Operating Freq. (kHz)

Features

EV-Kit

Industry Qualified

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX5096

1.25

3.3

Preset
Resistor

0.07

135

•	Current Limit

•	External Synchronization

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•	Reset Output

•

Shutdown

•	Soft Start

Automotive - General

THIN QFN/16
TSSOP/20

Yes

-40 to +125

$2.74 @ 1k

MAX5097

330

$2.74 @ 1k

See All Step-Down Switching Regulators (223)

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.