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LM5127-Q1

Name: LM5127-Q1
Brand: TI
SKU: LM5127-Q1
Price: 2.363 USD

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42V wide-Vin triple buck and boost controller for automotive applications

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Data sheet

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LM5127-Q1 2.2-MHz Wide VIN Automotive Front-stage Multi-rail DC/DC datasheet (Rev. A)

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Online data sheet

42V wide-Vin triple buck and boost controller for automotive applications

LM5127-Q1

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Data sheet

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Product details

Regulated outputs (#)

3

Vin (Min) (V)

0.8

Vin (Max) (V)

42

Iout (Max) (A)

30

Rating

Automotive

Step-down DC/DC controller

2

Step-up DC/DC controller

1

Iq (Typ) (mA)

3

Features

Channel 1 can be configured by the user as a boost, buck or SEPIC controller

Operating temperature range (C)

-40 to 150

Shutdown current (ISD) (Typ) (uA)

2.2

Configurability

Hardware configurable, User programmable

Regulated outputs (#)

3

Vin (Min) (V)

0.8

Vin (Max) (V)

42

Iout (Max) (A)

30

Rating

Automotive

Step-down DC/DC controller

2

Step-up DC/DC controller

1

Iq (Typ) (mA)

3

Features

Channel 1 can be configured by the user as a boost, buck or SEPIC controller

Operating temperature range (C)

-40 to 150

Shutdown current (ISD) (Typ) (uA)

2.2

Configurability

Hardware configurable, User programmable

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VQFN (RGZ)

48

49 mm² 7 x 7

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AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +125°C, T_A
Functional Safety-Capable
- Documentation available to aid functional safety system design
Suited for various architectures and scalable
- Triple-output synchronous controllers
- Flexible topology
  - CH1: boost / buck topology
  - CH2, CH3: two single phase bucks / dual-phase interleaved buck topology
- Enable pin and PGOOD indicator per channel
- Optional low I_Q battery monitor
Wide operating range for automotive applications
- 3.8-V to 42-V input operating range
- Minimum boost input 0.8 V when BIAS ≥ 3.8 V
- Boost output: adjustable up to 42 V
- Buck output: fixed 3.3 V, 5 V, or adj. 0.8 - 42 V
- Bypass operation when V_SUPPLY>V_LOAD (boost)
- LDO operation when V_SUPPLY ≈ V_LOAD (buck)
Minimized battery drain
- Shutdown current ≤ 2.8 µA
- Automatic transition to low-I_Q sleep mode
- Battery drain in sleep
  - I_Q≤ 14 µA when 3.3-V buck on
  - I_Q≤ 22 µA when 3.3-V and 5-V bucks on
  - I_Q≤ 32 µA when 3.3-V, 5-V bucks on and boost in bypass
- High efficiency using strong 5-V drivers
- Dual input VCC and VDD regulators
Small and cost-effective solution
- Maximum switching frequency 2.2 MHz
- Internal boot diode (boost)
- Constant peak current limit
- Supports DCR inductor current sensing
- QFN-48 with wettable flanks
Avoid AM band interference and crosstalk
- Optional clock synchronization
- Switching frequency from 100 kHz to 2.2 MHz
- Selectable switching mode (FPWM, diode emulation, and skip mode)
EMI mitigation
- Optional programmable spread spectrum
Programmability and flexibility
- Programmable wake-up and sleep threshold
- Dynamic switching frequency programming
- Adjustable soft start time
- Adjustable output using 0.8 V ±1% reference
- Adaptive dead-time control
Integrated protection features
- Overcurrent protection
  - Cycle-by-cycle peak current limit
  - Optional hiccup mode protection (buck)
  - Optional latch-off mode protection (buck)
- Overvoltage protection
- HB-SW short protection (boost)
- Thermal shutdown

AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +125°C, T_A
Functional Safety-Capable
- Documentation available to aid functional safety system design
Suited for various architectures and scalable
- Triple-output synchronous controllers
- Flexible topology
  - CH1: boost / buck topology
  - CH2, CH3: two single phase bucks / dual-phase interleaved buck topology
- Enable pin and PGOOD indicator per channel
- Optional low I_Q battery monitor
Wide operating range for automotive applications
- 3.8-V to 42-V input operating range
- Minimum boost input 0.8 V when BIAS ≥ 3.8 V
- Boost output: adjustable up to 42 V
- Buck output: fixed 3.3 V, 5 V, or adj. 0.8 - 42 V
- Bypass operation when V_SUPPLY>V_LOAD (boost)
- LDO operation when V_SUPPLY ≈ V_LOAD (buck)
Minimized battery drain
- Shutdown current ≤ 2.8 µA
- Automatic transition to low-I_Q sleep mode
- Battery drain in sleep
  - I_Q≤ 14 µA when 3.3-V buck on
  - I_Q≤ 22 µA when 3.3-V and 5-V bucks on
  - I_Q≤ 32 µA when 3.3-V, 5-V bucks on and boost in bypass
- High efficiency using strong 5-V drivers
- Dual input VCC and VDD regulators
Small and cost-effective solution
- Maximum switching frequency 2.2 MHz
- Internal boot diode (boost)
- Constant peak current limit
- Supports DCR inductor current sensing
- QFN-48 with wettable flanks
Avoid AM band interference and crosstalk
- Optional clock synchronization
- Switching frequency from 100 kHz to 2.2 MHz
- Selectable switching mode (FPWM, diode emulation, and skip mode)
EMI mitigation
- Optional programmable spread spectrum
Programmability and flexibility
- Programmable wake-up and sleep threshold
- Dynamic switching frequency programming
- Adjustable soft start time
- Adjustable output using 0.8 V ±1% reference
- Adaptive dead-time control
Integrated protection features
- Overcurrent protection
  - Cycle-by-cycle peak current limit
  - Optional hiccup mode protection (buck)
  - Optional latch-off mode protection (buck)
- Overvoltage protection
- HB-SW short protection (boost)
- Thermal shutdown

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The LM5127-Q1 is a full featured, wide input range three channel DC/DC controller which supports flexible topology (Boost/Buck) with peak current mode control. The device is designed as an integrated one-chip solution for the front-stage power supply in automotive infotainment, cluster, body control as well as ADAS systems. (continue on next page)

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Technical documentation

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	Type	Title	Date
*	Data sheet	LM5127-Q1 2.2-MHz Wide VIN Automotive Front-stage Multi-rail DC/DC datasheet (Rev. A)	17 Dec 2020
	Technical article	3 quiescent-current (Iq) specifications you need to understand	12 Nov 2021
	User guide	LM5127EVM-FLEX Evaluation Module (Rev. A)	16 Dec 2020
	Functional safety information	LM5127-Q1 Functional Safety, FIT Rate and Failure Mode Distribution	11 Dec 2020
	Certificate	LM5127EVM-FLEX EU RoHS Declaration of Conformity (DoC) (Rev. A)	25 Nov 2020

Design & development

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Evaluation board

LM5127EVM-FLEX — LM5127 Flexible topology evaluation Module

The LM5127EVM-FLEX showcases the features and performance of the LM5127-Q1 when configured with channel 1 as a pre-boost, and channel 2 and channel 3 configured as independent buck controllers. The input voltage range is 3V to 42V. The pre-boost can operate down to 3V during input transients, (...)

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User guide

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