L5964

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Automotive Monolithic dual 3.5A step-down switching regulator with LDO

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  • L5964 is a dual step-down switching regulator with internal power switches and a low drop-out linear/standby regulator, designed for car battery supplied applications. All the regulators have independent supply voltages, enables pins, power goods and thermal protections.

    The switching regulators have selectable voltage supervisors and power goods, and selectable current limits. The LDO has power good and fixed current limitation.
    The PMIC finds application in different automotive systems, where load dump protection and wide input voltage range are mandatory.
    Typically, the regulator connected to the battery works at low frequency, while the one connected to the pre-regulated voltage can make the most of the high frequency operation. In this way the efficiency of the system is improved and the ability of the product to function both as a pre- and post-regulator is exploited.
    For the same reason, in applications where both regulators must be connected to a battery, for example when powering a hub consisting of two USB ports, it is recommended to work at the lowest frequency. The linear regulator that remains available can be used to power the controller.
    The two DC-DC converters can work in free-run condition, with frequency selectable between two values, 270 kHz or 2.2 MHz, or synchronize themselves to an external clock (SYNCIN pin). They are 180° out of phase, while the synchronization output signal (SYNCOUT pin) is 90° out of phase with the first regulator. The phase shift simplifies the use of two ICs in the same application (4 DC/DCs regulators).
    The high operating frequency allowed by the synchronization input helps to reduce AM and FM interferences and grants the use of small and low cost inductors and capacitors.
    The two switching regulators can be used in parallel and increase the output current capability up to 7 A.
    The L5964 can work in two different modes, normal and microcontroller mode, based on the condition of a hardware pin.
    When the microcontroller mode is selected, some pins change functionality. For example, the reset and watchdog functions are available. In this way the PMIC easily manages the power management of a microcontroller.
    The availability of power good and enable signals, however, makes easy to manage the system power up sequence even without the presence of a microcontroller, since it is possible to enable a voltage only when the previous voltage is stable and with a precise delay.
    The total quiescent current, when both DC/DCs and LDO are disabled, is less than 10 μA.
    The product is available in LQFP64 with exposed pad up. This package is able to dissipate power through an external heatsink.

    Key Features

    • AEC-Q100 qualified
    • Two step-down synchronous switching voltage regulators with internal power switches:
      • Wide operating input voltage range (from 3.3 V to 26 V)
      • Output voltage selectable by external divider (feedback voltage at 0.9 V)
      • 0.9 V minimum output, maximum output limited by maximum Duty Cycle
      • DC/DCs can work in Low Power Mode for reduced current consumption in low output Load
      • Internal high-side/ low-side NDMOS
      • 270 kHz and 2.2 MHz selectable free-run frequencies
      • 125 kHz < f < 2.3 MHz synchronization range at SYNCIN pin
      • Programmable current limits at 2 A and 4 A
      • Independent hardware enabling pins
      • Independent supply inputs
      • 180° phase shift between outputs
      • Synch out 90 ° phase shift vs DC-DC1
      • Programmable switching frequency divider by 1, 2, 4, 8 between the two regulators
      • The two regulators can be paralleled
    • Independent voltage supervisors/power-goods with selectable thresholds through external pin:
      • two available thresholds for UV/OV/PG signals: 90-120-95% or 80-110-85% (output voltage percentage)
    • Soft-start, thermal protection
    • One standby/linear regulator:
      • Output selectable with external resistor divider till 10 V
      • Soft start, hardware enable pin
      • 250 mA maximum current capability
      • Standby operative mode
      • Programmable power good thresholds (85% or 95% output voltage percentage)
      • Thermal protection
    • Microcontroller reset with programmable duration, activated by output under voltage or watchdog fault
    • External High Side Driver enable pin
    • One integrated window watchdog (5 ms ≤ window ≤ 50 ms, with ± 20% tolerance)
    • Short circuit protected outputs
    • Low external components number
    • Low EMI
    • Thermal shutdown junction temperature 150°C

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      Digitally controlled DC-DC converter with L5964 for automotive applications

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      AEK-POW-100W4V1

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      AEK-POW-L5964V1

      Description:

      Digitally controlled DC-DC converter with L5964 for automotive applications

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STMicroelectronics - L5964

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L5964L-VYY
Active
LQFP Automotive Ecopack2
L5964Q-V0Y
Preview
VFQFPN 48 7x7x1.0 Automotive Ecopack2

L5964L-VYY

Package:

LQFP

Material Declaration**:

PDF XML

Marketing Status

Active

Package

LQFP

Grade

Automotive

RoHS Compliance Grade

Ecopack2

L5964Q-V0Y

Package:

VFQFPN 48 7x7x1.0

Material Declaration**:

PDF XML

Marketing Status

Preview

Package

VFQFPN 48 7x7x1.0

Grade

Automotive

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L5964L-VYY No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tray LQFP -40 105 MALAYSIA 2.9 / 1k
L5964Q-V0Y No availability of distributors reported, please contact our sales office
Preview
EAR99 NEC Tray VFQFPN 48 7x7x1.0 -40 105 THAILAND 2.4 / 1k

L5964L-VYY

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.9 / 1k

ECCN (EU)

NEC

Packing Type

Tray

Package

LQFP

Operating Temperature (°C)

(min)

-40

(max)

105

Budgetary Price (US$)* / Qty

2.9 / 1k

Country of Origin

MALAYSIA

L5964Q-V0Y

Marketing Status

Preview

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.4 / 1k

ECCN (EU)

NEC

Packing Type

Tray

Package

VFQFPN 48 7x7x1.0

Operating Temperature (°C)

(min)

-40

(max)

105

Budgetary Price (US$)* / Qty

2.4 / 1k

Country of Origin

THAILAND

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors