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Product Detailed Parameters
- Description：200 MA LOW DROPOUT LDO
- Series：*
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：-
- Output Type：-
- Number of Regulators：-
- Voltage - Input (Max)：-
- Voltage - Output (Min/Fixed)：-
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：-
- Current - Quiescent (Iq)：-
- Current - Supply (Max)：-
- PSRR：-
- Control Features：-
- Protection Features：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The LDH40MR is an adjustable low dropout linear regulator from STMicroelectronics, designed for automotive and industrial battery applications. It supports input voltages from 3.3 V to 40 V and delivers a guaranteed output current of 200 mA. The device features ultra-low quiescent current (2 μA typical at no load) and standby consumption below 0.3 µA. Output voltage is adjustable from 1.2 V to 22 V with 0.5% tolerance at 25 °C. It includes logic-controlled shutdown, Power Good indication, internal current limit, thermal shutdown, and active output discharge.
Feature Summary
- High accuracy voltage regulation suitable for direct car battery connection
- Ultra-low quiescent current extends battery life in always-on-standby systems
- Robust protection including thermal shutdown, internal current limit, and active output discharge
- Logic-controlled enable function allows deep shutdown mode
Applications
- EV powertrain
- Body control modules
- Always-on battery connected application
- Infotainment and instrument cluster
- ADAS
Procurement Notes
Verify the specific ordering code LDH40MR corresponds to the SOT23-5L package variant when sourcing. Confirm that the design requires the adjustable version functionality, as fixed-output variants exist within the same family. Ensure component selection aligns with AEC-Q100 Grade 1 qualification requirements for automotive deployment.
Selection Notes
Select this component for designs requiring high input voltage tolerance up to 40 V and minimal space utilization via the SOT23-5L package. It is appropriate for applications needing precise voltage adjustment between 1.2 V and 22 V. Consider its low ground current for battery-powered systems where standby consumption is critical.
Part Context
The LDH40 series comprises high-accuracy LDO regulators engineered for automotive environments. The LDH40MR specifically denotes the adjustable version housed in a compact SOT23-5L package. This part complements other automotive-grade power management solutions by providing stable regulation under varying load and temperature conditions.
Replacement Considerations
LDH40PURY
FAQ
What is the maximum adjustable output voltage range?
The output voltage can be adjusted from 1.2 V up to 22 V using an external resistor divider connected to the ADJ pin.
How does the device handle output discharge when disabled?
The LDH40MR embeds an open-drain MOSFET that actively discharges the output capacitor through approximately 150 Ω when the enable pin is set to zero.
