TI LP876242-Q1：汽车与工业安全应用四通道降压转换器

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"TI-LP876242-Q1.pdf是一款专为AWR和IWR毫米波雷达模块设计的四通道8.8MHz降压转换器，适用于汽车和工业领域的功能安全应用。" TI的LP876242-Q1是一款高度集成的电源管理集成电路（PMIC），它具有符合AEC-Q100标准的汽车级性能，能够承受-40°C至+125°C的工作温度范围，同时具备第二级静电放电（ESD）防护能力。此芯片设计考虑了功能安全，提供了符合ISO26262 ASIL-D和IEC61508 SIL-3要求的文档支持，确保系统能够在高安全等级下运行。该器件的核心是四个高效降压DC/DC转换器，能够提供0.9V至1.9V的可调输出电压，最大输出电流分别为4A、3A、3A和2A。转换器的开关频率固定在8.8MHz，且输出电压压摆率可编程，范围在0.5mV/μs到33mV/μs之间。此外，LP876242-Q1还集成了输入电压过压和欠压保护，以及窗口式电压和过流监控器。该PMIC还包括10个可配置的通用输入/输出（GPIO）引脚，可以灵活适应不同应用的需求。通过SPMI接口，LP876242-Q1支持与其他PMIC同步，增强系统电源管理的协调性。为了实现更精确的系统控制，器件提供I2C或SPI兼容的串行接口，允许用户动态调整设置。在保护和诊断方面，LP876242-Q1配备了一个看门狗定时器，具有可选的触发和问答模式，以及电平或脉宽调制（PWM）错误信号监控。此外，还包括温度监测功能，具有高温警告和热关断，以及CRC错误检测，以确保配置寄存器和非易失性存储器的位完整性。在应用上，LP876242-Q1特别适合用于级联配置的成像雷达、远距离雷达和无处理功能的雷达模块，这些应用通常需要高质量、可靠的电源解决方案来确保雷达系统的稳定性和准确性。该器件通过其丰富的保护特性，如OVP和UVLO，以及智能诊断机制，增强了系统在恶劣环境下的鲁棒性。 LP876242-Q1是汽车和工业领域高安全要求应用的理想选择，其高效的电源转换、灵活的配置选项、全面的保护机制和功能安全特性，确保了系统的可靠性和高性能。

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6.5 Internal Low Drop-Out Regulators (LDOVINT)

Over operating free-air temperature range, V

VCCA

= 3.3 V (unless otherwise noted). Voltage level refers to the AGNDx

ground of the device.

POS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Electrical Characteristics

2.1 C

OUT(LDOVINT)

Output filtering capacitance

(1)

Connected from VOUT_LDO to AGNDx 1 2.2 4 µF

2.3 V

OUT(LDOVINT)

LDOVINT output voltage 1.8 V

2.7 I

Qon(LDOVINT)

Quiescent current, on mode LDOVINT under valid operating condition, I

LOAD

= 0 mA 3 10 µA

2.8 R

DIS(LDOVINT)

Pulldown discharge resistance

at LDOVINT output

Off mode, pulldown enabled and LDO disabled 60 125 190

(1) When DC voltage is applied to a ceramic capacitor, the effective capacitance is reduced due to DC bias effect. The table above

therefore lists the minimum value as CAPACITANCE. In order to meet the minimum capacitance requirement, the nominal value of the

capacitor may have to be scaled accordingly to take the drop of capacitance into account for a given dc voltage at the outputs of

regulators.

6.6 BUCK1, BUCK2, BUCK3, and BUCK4 Regulators

Over operating free-air temperature range (unless otherwise noted). Voltage level refers to the AGNDx ground of the device.

POS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Electrical Characteristics - Output Voltage

3.1b

VOUT_Bx_Ste

Output voltage programmable

step size

0.9 V ≤ V

VOUT_Bx

< 1.1 V

3.1c

1.1 V ≤ V

VOUT_Bx

< 1.66 V

3.1d

1.66 V ≤ V

VOUT_Bx

≤ 1.9 V

3.3

Input and output voltage

difference

Minimum voltage between PVIN_Bx and

VOUT_Bx to fulfill the electrical

characteristics

0.7 V

3.4a

VOUT_Bx_Sle

w_Rate

Output voltage slew-rate

programmable range

(5)

(6)

(8)

BUCKn_SLEW_RATE[2:0] = 000b 26.6 33.3 36.6

mV/µs

3.4b BUCKn_SLEW_RATE[2:0] = 001b 17 20 22

3.4c BUCKn_SLEW_RATE[2:0] = 010b 9 10 11

3.4d BUCKn_SLEW_RATE[2:0] = 011b 4.5 5 5.5

3.4e BUCKn_SLEW_RATE[2:0] = 100b 2.25 2.5 2.75

3.4f BUCKn_SLEW_RATE[2:0] = 101b 1.12 1.25 1.38

3.4g BUCKn_SLEW_RATE[2:0] = 110b 0.56 0.625 0.69

3.4h BUCKn_SLEW_RATE[2:0] = 111b 0.281 0.3125 0.344

Electrical Characteristics - Output Current, Limits and Thresholds

3.6e

OUT_Bx

Output current

(3)

(4)

Buck1 2

A3.6f Buck2 4

3.6g Buck3 / Buck4 3

3.8

LIM FWD

PEAK Range

Forward current limit (peak

during each switching cycle)

Programmable range

2.5 6.5 A

3.9

LIM FWD

PEAK Step

Forward current limit step Size 1 A

3.10a

LIM FWD

PEAK Accuracy

Forward current limit accuracy

LIM

= 2.5 A, 3.5 A, 4.5 A, 3.0 V ≤

PVIN_Bx

≤ 5.5 V

-0.55 0.55 A

3.10b

LIM

= 5.5 A, 6.5 A 4.5 V ≤ V

PVIN_Bx

≤

5.5 V

–10%

10%

3.10c

LIM

= 5.5 A, 6.5 A 3.0 V ≤ V

PVIN_Bx

≤

4.5 V

–15%

10%

3.11 I

LIM NEG

Negative current limit (peak

during each switching cycle)

1.5 2 2.6 A

Electrical Characteristics - Current Consumption, On Resistance, and Output Pulldown Resistance

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6.6 BUCK1, BUCK2, BUCK3, and BUCK4 Regulators (continued)

Over operating free-air temperature range (unless otherwise noted). Voltage level refers to the AGNDx ground of the device.

POS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

3.17 I

off

Shutdown current, BUCKx

disabled

1 µA

3.19

DS(ON) HS

FET

On-resistance, high-side FET I

OUT_Bx

= 1 A 26 65

mΩ

3.20

DS(ON) LS

FET

On-resistance, low-side FET I

OUT_Bx

= 1 A 16 35

mΩ

3.21 R

DIS_Bx

Output pulldown discharge

resistance

Regulator disabled, per phase,

BUCKx_PLDN = 1, between SW_Bx and

PGND pins

50 100 150

3.21b

TH_SC_RV_B

Threshold voltage for Short

Circuit and Residual Voltage

Detection

140 150 160 mV

3.22 R

SW_SC

Resistance threshold for Short

circuit detection at the SW pin

3 5 25

Electrical Characteristics - 8.8MHz Single-Phase Configuration

3.96 V

PVIN_Bx

Input voltage range 3.0 3.3 5.5 V

3.97a

VOUT_Bx

Output voltage programmable

range

OUT_Bx

≤ 3 A

0.9 1.9

3.97b

OUT_Bx

≤ 4 A

0.9 1.4

3.98 C

IN_Bx

Input filtering capacitance

(1)

(2)

3 22 µF

3.99a C

OUT-Local_Bx

Output capacitance, local with

filter

(2)

24 44 106 µF

3.99b C

OUT-Filter_Bx

Output capacitance, after filter

(2)

Capacitance after every filter 20 33 80 µF

3.99c

OUT-

No_Filter_Bx

Output capacitance, no filter

(2)

24 44 106 µF

3.100a

Power inductor

Inductance 329 470 611 nH

3.100b DCR 10

mΩ

3.100c L

Ext

Filter1 Inductor, 100nH 70 100 130 nH

3.100d L

Ext

Filter2 Ferrite, MPZ2012S300A

3.101 I

Q_PWM

PWM mode Quiescent current I

OUT_Bx

= 0 mA 30 mA

3.167a

OUT_DC_Bx

DC output voltage accuracy,

includes voltage reference, DC

load and line regulations and

temperature

VOUT_Bx

< 1 V, PWM mode

–10

10 mV

3.167b

VOUT_Bx

≥ 1 V, PWM mode –1%

3.103a

LDSR

Transient load step response,

1V8

(7)

Local

as in Pos3.99a, no additional filter:

VOUT_Bx

= 1.8 V, I

OUT_Bx

= 0.5 A to 1.8 A,

= t

= 4 µs

mV3.103c

Transient load step response,

1V2

(7)

Local

as in Pos3.99a, no additional filter:

VOUT_Bx

= 1.2 V, I

OUT_Bx

= 1.95 A to 3 A,

= t

= 1 µs

3.103e

Transient load step response,

1V0

(7)

Local

as in Pos3.99a, no additional filter:

VOUT_Bx

= 1.0 V, I

OUT_Bx

= 0 A to 2.5 A, t

= t

= 4 µs

3.104 T

LNSR

Transient line response, no filter

PVIN_Bx

stepping between 3 V and 3.5 V

or between 4.8 V and 5.3 V, t

= t

= 10 µs,

OUT_Bx

= I

OUT(max)

-25 ±5 25 mV

3.105 V

OUT_Ripple

Ripple voltage

(7)

PWM mode 4 mV

Timing Requirements

3.108 Settling time after voltage scaling

From end of voltage ramp to V

OUT

within

15 mV from V

OUT_DC_Bx

(9)

105 µs

3.109 Start-up delay From enable to start of output voltage rise 100 150 200 µs

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6.6 BUCK1, BUCK2, BUCK3, and BUCK4 Regulators (continued)

Over operating free-air temperature range (unless otherwise noted). Voltage level refers to the AGNDx ground of the device.

POS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

3.110 t

delay_OC

Over-current detection delay

Peak current limit triggering during every

switching cycle

7 µs

3.111 t

deglitch_OC

Over-current detection signal

deglitch time

Digital deglitch time for detected signal.

Time duration to filter out short positive

and negative pulses

19 23 µs

3.112 t

latency_OC

Over-current signal latency time

from detection

Total delay from over-current detection to

interrupt or PFSM trigger

30 µs

Switching Characteristics

3.106c

Switching frequency, PWM mode

NVM programmable

8.8 MHz setting, internal clock 8 8.8 9.6

MHz

3.106f

8.8 MHz setting, internal clock, spread

spectrum enabled

7.0 8.8 10.6

3.106i

8.8 MHz setting, synchronized to external

clock

7.0 8.8 10.6

(1) Input capacitors must be placed as close as possible to the device pins.

(2) When DC voltage is applied to a ceramic capacitor, the effective capacitance is reduced due to DC bias effect. The table above

therefore lists the minimum value as CAPACITANCE. In order to meet the minimum capacitance requirement, the nominal value of the

capacitor may have to be scaled accordingly to take the drop of capacitance into account for a given dc voltage at the outputs of

regulators.

(3) The maximum output current can be limited by the forward current limit I

LIM FWD

. The maximum output current is also limited by the

junction temperature and maximum average current over lifetime. The power dissipation inside the die increases the junction

temperature and limits the maximum current depending of the length of the current pulse, efficiency, board and ambient temperature.

(4) Advance thermal design is required to avoid thermal shutdown.

(5) SLEW_RATEx[2:0] register default comes from NVM memory, and can be re-programed by software. Output capacitance, forward and

negative current limits and load current may limit the maximum and minimum slew rates.

(6) A high slew-rate setting can generate over and undershoot during voltage change. See Application Section for more information.

(7) Please refer to the applications section of the data sheet regarding the power delivery network (PDN) used for the transient load step

and output ripple test conditions. All ripple specs are defined across POL capacitor in the described PDN.

(8) Slew-rate is measured from 10% to 90% of the voltage ramp with voltage step ≥ 500 mV.

(9) Voltage ramp is calculated using slew-rate from minimum column.

6.7 Reference Generator (REFOUT)

Over operating free-air temperature range (unless otherwise noted). Voltage level refers to the AGNDx ground of the device.

POS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Electrical Characteristics

4.1 Max capacitance for REFOUT signal Capacitance between REFOUT signal and ground 100 pF

4.2 Output voltage Measured at the REFOUT signal 1.17 1.2 1.23 V

Timing Requirements

4.4 t

SU_REF

Start-up time

From REFOUT_EN=1 to the time REFOUT voltage

settles

30 µs

6.8 Monitoring Functions

Over operating free-air temperature range (unless otherwise noted). Voltage level refers to the AGNDx ground of the device.

POS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Electrical Characteristics: BUCK REGULATORS OUTPUT, VMONx INPUT

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6.8 Monitoring Functions (continued)

Over operating free-air temperature range (unless otherwise noted). Voltage level refers to the AGNDx ground of the device.

POS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

5.1a

BUCK_OV_TH

VMON_OV_TH

Overvoltage monitoring for

buck output and VMONx pin

input, programable threshold

accuracy, V

OUT_Bx

/ V

VMONx

1 V

(1)

BUCKn_OV_THR / VMONn_OV_THR = 0x0,

VMONn_RANGE_SEL = 0

2% 3% 4%

5.1b

BUCKn_OV_THR / VMONn_OV_THR = 0x1,

VMONn_RANGE_SEL = 0

2.5% 3.5% 4.5%

5.1c

BUCKn_OV_THR / VMONn_OV_THR = 0x2,

VMONn_RANGE_SEL = 0

3% 4% 5%

5.1d

BUCKn_OV_THR / VMONn_OV_THR = 0x3,

VMONn_RANGE_SEL = 0

4% 5% 6%

5.1e

BUCKn_OV_THR / VMONn_OV_THR = 0x4,

VMONn_RANGE_SEL = 0

5% 6% 7%

5.1f

BUCKn_OV_THR / VMONn_OV_THR = 0x5,

VMONn_RANGE_SEL = 0

6% 7% 8%

5.1g

BUCKn_OV_THR / VMONn_OV_THR = 0x6,

VMONn_RANGE_SEL = 0

7% 8% 9%

5.1h

BUCKn_OV_THR / VMONn_OV_THR = 0x7,

VMONn_RANGE_SEL = 0

9% 10% 11%

5.2a

BUCK_OV_TH_

VMON_OV_TH_

Overvoltage monitoring for

buck output and VMONx pin

input, programable threshold

accuracy, V

OUT_Bx

VMONx

≤ 1 V

(1)

BUCKn_OV_THR / VMONn_OV_THR = 0x0,

VMONn_RANGE_SEL = 0

20 30 40

5.2b

BUCKn_OV_THR / VMONn_OV_THR = 0x1,

VMONn_RANGE_SEL = 0

25 35 45

5.2c

BUCKn_OV_THR / VMONn_OV_THR = 0x2,

VMONn_RANGE_SEL = 0

30 40 50

5.2d

BUCKn_OV_THR / VMONn_OV_THR = 0x3,

VMONn_RANGE_SEL = 0

40 50 60

5.2e

BUCKn_OV_THR / VMONn_OV_THR = 0x4,

VMONn_RANGE_SEL = 0

50 60 70

5.2f

BUCKn_OV_THR / VMONn_OV_THR = 0x5,

VMONn_RANGE_SEL = 0

60 70 80

5.2g

BUCKn_OV_THR / VMONn_OV_THR = 0x6,

VMONn_RANGE_SEL = 0

70 80 90

5.2h

BUCKn_OV_THR / VMONn_OV_THR = 0x7,

VMONn_RANGE_SEL = 0

90 100 110

5.3a

BUCK_UV_TH

VMON_UV_TH

Undervoltage monitoring for

buck output and VMONx pin

input, programable threshold

accuracy, V

OUT_Bx

/ V

VMONx

1 V

(1)

BUCKn_UV_THR / VMONn_UV_THR = 0x0,

VMONn_RANGE_SEL = 0

–4% –3% –2%

5.3b

BUCKn_UV_THR / VMONn_UV_THR = 0x1,

VMONn_RANGE_SEL = 0

–

4.5%

–

3.5%

–

2.5%

5.3c

BUCKn_UV_THR / VMONn_UV_THR = 0x2,

VMONn_RANGE_SEL = 0

–5% –4% –3%

5.3d

BUCKn_UV_THR / VMONn_UV_THR = 0x3,

VMONn_RANGE_SEL = 0

–6% –5% –4%

5.3e

BUCKn_UV_THR / VMONn_UV_THR = 0x4,

VMONn_RANGE_SEL = 0

–7% –6% –5%

5.3f

BUCKn_UV_THR / VMONn_UV_THR = 0x5,

VMONn_RANGE_SEL = 0

–8% –7% –6%

5.3g

BUCKn_UV_THR / VMONn_UV_THR = 0x6,

VMONn_RANGE_SEL = 0

–9% –8% –7%

5.3h

BUCKn_UV_THR / VMONn_UV_THR = 0x7,

VMONn_RANGE_SEL = 0

–11%

–

10%

–9%

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6.8 Monitoring Functions (continued)

Over operating free-air temperature range (unless otherwise noted). Voltage level refers to the AGNDx ground of the device.

POS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

5.4a

BUCK_UV_TH_

VMON_UV_TH_

Undervoltage monitoring for

buck output and VMONx pin

input, programable threshold

accuracy, V

OUT_Bx

VMONx

≤ 1 V

(1)

BUCKn_UV_THR / VMONn_UV_THR = 0x0,

VMONn_RANGE_SEL = 0

–40 –30 –20

5.4b

BUCKn_UV_THR / VMONn_UV_THR = 0x1,

VMONn_RANGE_SEL = 0

–45 –35 –25

5.4c

BUCKn_UV_THR / VMONn_UV_THR = 0x2,

VMONn_RANGE_SEL = 0

–50 –40 –30

5.4d

BUCKn_UV_THR / VMONn_UV_THR = 0x3,

VMONn_RANGE_SEL = 0

–60 –50 –40

5.4e

BUCKn_UV_THR / VMONn_UV_THR = 0x4,

VMONn_RANGE_SEL = 0

–70 –60 –50

5.4f

BUCKn_UV_THR / VMONn_UV_THR = 0x5,

VMONn_RANGE_SEL = 0

–80 –70 –60

5.4g

BUCKn_UV_THR / VMONn_UV_THR = 0x6,

VMONn_RANGE_SEL = 0

–90 –80 –70

5.4h

BUCKn_UV_THR / VMONn_UV_THR = 0x7,

VMONn_RANGE_SEL = 0

–110 –100 –90

5.5a

VMON_OV_TH2

Overvoltage monitoring for

VMONx pin input with

extended range

(1)

VMONn_OV_THR = 0x0, VMONn_RANGE_SEL = 1 100 150 200

5.5b VMONn_OV_THR = 0x1, VMONn_RANGE_SEL = 1 125 175 225

5.5c VMONn_OV_THR = 0x2, VMONn_RANGE_SEL = 1 150 200 250

5.5d VMONn_OV_THR = 0x3, VMONn_RANGE_SEL = 1 200 250 300

5.5e VMONn_OV_THR = 0x4, VMONn_RANGE_SEL = 1 250 300 350

5.5f VMONn_OV_THR = 0x5, VMONn_RANGE_SEL = 1 300 350 400

5.5g VMONn_OV_THR = 0x6, VMONn_RANGE_SEL = 1 350 400 450

5.5h VMONn_OV_THR = 0x7, VMONn_RANGE_SEL = 1 450 500 550

5.6a

VMON_UV_TH2

Undervoltage monitoring for

VMONx pin input with

extended range

(1)

VMONn_UV_THR = 0x0, VMONn_RANGE_SEL = 1 -200 -150 -100

5.6b VMONn_UV_THR = 0x1, VMONn_RANGE_SEL = 1 -225 -175 -125

5.6c VMONn_UV_THR = 0x2, VMONn_RANGE_SEL = 1 -250 -200 -150

5.6d VMONn_UV_THR = 0x3, VMONn_RANGE_SEL = 1 -300 -250 -200

5.6e VMONn_UV_THR = 0x4, VMONn_RANGE_SEL = 1 -350 -300 -250

5.6f VMONn_UV_THR = 0x5, VMONn_RANGE_SEL = 1 -400 -350 -300

5.6g VMONn_UV_THR = 0x6, VMONn_RANGE_SEL = 1 -450 -400 -350

5.6h VMONn_UV_THR = 0x7, VMONn_RANGE_SEL = 1 -550 -500 -450

5.6i V

TH_RV(VMON)

Threshold voltage for

Residual Voltage Detection at

VMONx pins

140 150 160 mV

Electrical Characteristics: VCCA INPUT

5.7a

VCCA

OV_TH

Overvoltage monitoring for

VCCA input, programable

threshold accuracy

(2)

VCCA_OV_THR = 0x0 2% 3% 4%

5.7b VCCA_OV_THR = 0x1 2.5% 3.5% 4.5%

5.7c VCCA_OV_THR = 0x2 3% 4% 5%

5.7d VCCA_OV_THR = 0x3 4% 5% 6%

5.7e VCCA_OV_THR = 0x4 5% 6% 7%

5.7f VCCA_OV_THR = 0x5 6% 7% 8%

5.7g VCCA_OV_THR = 0x6 7% 8% 9%

5.7h VCCA_OV_THR = 0x7 9% 10% 11%

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