LTC7871HLWE#PBF

The LTC7871HLWE#PBF is an electronic component from Analog Devices Inc.. View the full LTC7871HLWE#PBF datasheet below including key specifications, pinout, electrical characteristics.

Manufacturer

Analog Devices Inc.

Key Specifications

Parameter	Value
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Clock Sync	Yes
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Control Features	Enable, Power Good, Soft Start
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Duty Cycle (Max)	98%
Switching Frequency	60kHz ~ 750kHz
Function	Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	6
Operating Temperature	-40°C ~ 150°C (TJ)
Output Configuration	Positive
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Phases	6
Output Type	Transistor Driver
Package / Case	64-LQFP Exposed Pad
Packaging	Tray
Packaging	Tray
Packaging	Tray
Packaging	Tray
Packaging	Tray
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Serial Interfaces	SPI
Standard Pack Qty	160
Standard Pack Qty	160
Standard Pack Qty	160
Standard Pack Qty	160
Standard Pack Qty	160
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Supplier Device Package	64-LQFP-EP (10x10)
Synchronous Rectifier	Yes
Topology	Buck-Boost
Supply Voltage	6V ~ 100V

Overview

Part: LTC7871 — Analog Devices

Type: Six-Phase, Synchronous Bidirectional Buck or Boost Controller

Description: The LTC7871 is a high performance six-phase bidirectional buck or boost switching regulator controller that operates from V HIGH voltages up to 100V and V LOW voltages up to 60V, featuring ±1% voltage regulation accuracy and an SPI compliant serial interface. It allows dynamic regulation of input voltage, output voltage, or current.

Operating Conditions:

Supply voltage: V HIGH: 6–100 V, V LOW: 1.2–60 V
Operating temperature: -40 to 150 °C
Switching frequency: 60 kHz to 750 kHz

Absolute Maximum Ratings:

Max supply voltage: V HIGH: 100 V
Max continuous current: DRV CC /EXTV CC Peak Current: 150 mA
Max junction/storage temperature: 150 °C

Key Specs:

V HIGH Supply Voltage Range: 6 V to 100 V
V LOW Supply Voltage Range: 1.2 V to 60 V
V LOW Regulated Feedback Voltage: 1.188 V to 1.212 V (l, ITH LOW Voltage = 1.5V)
V HIGH Regulated Feedback Voltage: 1.188 V to 1.212 V (l, ITH HIGH Voltage = 0.5V)
Synchronous Rectification Efficiency: Up to 98%
Synchronizable Frequency: 60 kHz to 750 kHz (l, SYNC = External Clock)
Maximum Current Sense Threshold (R SENSE Configuration): 12.5 mV (Typ, V ILIM = 0V)
Buck Mode Maximum Duty Cycle: 98%

Features:

Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current
Operates with External Gate Drivers and MOSFETs
Synchronous Rectification: Up to 98% Efficiency
±1% Voltage Regulation Accuracy Overtemperature
SPI Compliant Serial Interface
Multiphase/Multi-ICs Operation Up to 24 Phases

Applications:

Automotive 48V/12V Dual Battery Systems
Backup Power Systems

Package:

64-Lead (10mm × 10mm) Plastic LQFP

Features

n Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current
n Operates with External Gate Drivers and MOSFETs
n VHIGH Voltages Up to 100V; V LOW Voltages Up to 60V
n Synchronous Rectification: Up to 98% Efficiency
n ADI-Proprietary Advanced Current Mode Control
n ±1% Voltage Regulation Accuracy Overtemperature
n Accurate, Programmable Inductor Current Monitoring and Bidirectional Regulation
n SPI Compliant Serial Interface
n Operation Status and Fault Report
n Programmable V HIGH , V LOW Margining
n Phase-Lockable Frequency: 60kHz to 750kHz
n Optional Spread Spectrum Modulation
n Multiphase/Multi-ICs Operation Up to 24 Phases
n Selectable CCM/DCM/Burst Mode Operation
n Thermally Enhanced 64-Lead LQFP Package
n AEC-Q100 Qualification in Progress

Applications

n Automotive 48V/12V Dual Battery Systems
n Backup Power Systems

Pin Configuration

LTC7871HLWE#PBF – 64-LQFP Exposed Pad Pinout

Pin	Name	Type	Description
1	SS	I	Soft-Start
2	NC	–	No Connect
3	VFB_LOW	I	V_LOW Feedback
4	ITH_LOW	I	V_LOW Error Amplifier Output
5	SGND	P	Signal Ground
6	ITH_HIGH	I	V_HIGH Error Amplifier Output
7	VFB_HIGH	I	V_HIGH Feedback
8	NC	–	No Connect
9	V5	P	5V Supply
10	IMON	O	Current Monitor Output
11	SETCUR	I	Set Current DAC Input
12	NC	–	No Connect
13	OV_HIGH	I	V_HIGH Overvoltage Threshold
14	UV_HIGH	I	V_HIGH Undervoltage Threshold
15	OV_LOW	I	V_LOW Overvoltage Threshold
16	SGND	P	Signal Ground
17	SNSA-	I	Sense A Minus
18	SNSA+	I	Sense A Plus
19	SNSB-	I	Sense B Minus
20	SNSB+	I	Sense B Plus
21	SNSC-	I	Sense C Minus
22	SNSC+	I	Sense C Plus
23	SNSD-	I	Sense D Minus
24	SNSD+	I	Sense D Plus
25	SNSE-	I	Sense E Minus
26	SNSE+	I	Sense E Plus
27	SNSF-	I	Sense F Minus
28	SNSF+	I	Sense F Plus
29	SNSG-	I	Sense G Minus
30	SNSG+	I	Sense G Plus
31	SNSH-	I	Sense H Minus
32	SNSH+	I	Sense H Plus
33	PWM4	O	PWM Output 4
34	PWM5	O	PWM Output 5
35	FAULT	O	Fault Output
36	PWM6	O	PWM Output 6
37	CSB	I	Chip Select / SPI Bus
38	SDO	I/O	Serial Data Out / SPI Bus
39	SDI	I	Serial Data In / SPI Bus
40	SCLK	I	Serial Clock / SPI Bus
41	NC	–	No Connect
42	EXT_VCC	P	External VCC Supply
43	NC	–	No Connect
44	DRVSET	I	Driver Supply Voltage Set
45	SGND	P	Signal Ground
46	DRV_CC	P	Driver Supply Voltage
47	NC	–	No Connect
48	V_HIGH	P	V_HIGH Supply Input
49	SNSI+	I	Sense I Plus
50	SNSI-	I	Sense I Minus
51	SNSJ+	I	Sense J Plus
52	SNSJ-	I	Sense J Minus
53	SNSK+	I	Sense K Plus
54	SNSK-	I	Sense K Minus
55	SNSL+	I	Sense L Plus
56	SNSL-	I	Sense L Minus
57	SNSM+	I	Sense M Plus
58	SNSM-	I	Sense M Minus
59	SNSN+	I	Sense N Plus
60	SNSN-	I	Sense N Minus
61	SNSO+	I	Sense O Plus
62	SNSO-	I	Sense O Minus
63	SNSP+	I	Sense P Plus
64	SNSP-	I	Sense P Minus
65	SGND (Exposed Pad)	P	Signal Ground – Must be soldered to PCB

Notes

Pin 65 (Exposed Pad): The exposed pad on the bottom of the package is connected to SGND and must be soldered to the PCB for proper thermal and electrical performance.
Multiple Ground Pins: SGND appears on pins 5, 16, 45, and 65 (exposed pad).
SPI Interface: Pins 37–40 form the SPI bus (CSB, SDO, SDI, SCLK).
PWM Outputs: Pins 33, 34, 36 provide PWM drive signals.
Sense Pins: Pins 17–64 (excluding PWM, FAULT, and SPI pins) provide 16 differential current-sense input pairs (A–P).
No Connect Pins: Pins 2, 8, 12, 41, 43, 47 are marked NC and should not be connected.

Electrical Characteristics

SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	UNITS
	Current Sense Pin Voltage (V SNSD + - V SNS - ) to IMON Gain	V ILIM = 0V, 1/4 V V5 V ILIM = Float, 3/4 V V5 , V V5			40 20		V/V V/V
	Total DC Sense Signal Gain	DCR Configuration			5		V/V
	Total DC Sense Signal Gain	R SENSE Configuration			4		V/V
V SENSE(MAX) (DCR Configuration)	Maximum Current Sense Threshold (Buck and Boost Mode)	V ILIM = 0V V ILIM = 1/4 V V5 V ILIM = Float V ILIM = 3/4 V V5 V ILIM = V V5	l l l l l	6.5 17.0 27.0 36.0 44.0	10.0 20.0 30.0 40.0 50.0	13.5 23.0 33.0 44.0 56.0	mV mV mV mV mV
V SENSE(MAX) (R SENSE Configuration)	Maximum Current Sense Threshold (Buck and Boost Mode)	V ILIM = 0V V ILIM = 1/4 V V5 V ILIM = Float V ILIM = 3/4 V V5 V ILIM = V V5	l l l l l	8.1 21.2 33.7 45.0 55.0	12.5 25.0 37.5 50.0 62.5	16.9 28.8 41.3 55.0 70.0	mV mV mV mV mV
V OCFT	Overcurrent Fault Threshold, V SNSD + - V SNS -	V ILIM = 0V V ILIM = 1/4 V V5 V ILIM = Float V ILIM = 3/4 V V5 V ILIM = V V5	l l l l l	31.0 43.0 54.0 65.0 76.0	37.5 50.0 62.5 75.0 87.5	44.0 57.0 71.0 85.0 99.0	mV mV mV mV mV
V NOCFT	Negative Overcurrent Fault Threshold, V SNSD + - V SNS -	V ILIM = 0V V ILIM = 1/4 V V5 V ILIM = Float V ILIM = 3/4 V V5 V ILIM = V V5	l l l l l	-45.0 -58.0 -72.0 -86.0 -100.0	-37.5 -50.0 -62.5 -75.0 -87.5	-30.0 -42.0 -53.0 -64.0 -75.0	mV mV mV mV mV
	Overcurrent Fault Threshold Hysteresis, \	V SNSD + - V SNS - \		V ILIM = 0V V ILIM = 1/4 V V5 , Float, 3/4 V V5 , V V5			25 31
DRV CC and V5 Linear Regulators	DRV CC and V5 Linear Regulators	DRV CC and V5 Linear Regulators	DRV CC and V5 Linear Regulators	DRV CC and V5 Linear Regulators	DRV CC and V5 Linear Regulators	DRV CC and V5 Linear Regulators	DRV CC and V5 Linear Regulators
V DRVCC	DRV CC Regulation Voltage	12V < V EXTVCC < 60V, V DRVSET = V V5 12V < V EXTVCC < 60V, V DRVSET = Float 12V < V EXTVCC < 60V, V DRVSET = 0V		9.5 7.6 4.8	10 8 5	10.5 8.4 5.2	V V V
	DRV CC Load Regulation	I DRVCC = 0mA to 100mA, V EXTVCC = 14V			1.6	3.0	%
	EXTV CC Switchover Voltage EXTV CC Hysteresis	EXTV CC Ramping Positive, V DRVSET = V V5 EXTV CC Ramping Positive, V DRVSET = Float EXTV CC Ramping Positive, V DRVSET = 0V			10.7 8.5 6.9 12		V V V %
V5	V5 Regulation Voltage	6V < V DRVCC < 10V		4.8	5.0	5.2	V
	V5 Load Regulation	I V5 = 0mA to 20mA			0.5	1	%
Current DACs (IDAC)	Current DACs (IDAC)	Current DACs (IDAC)	Current DACs (IDAC)	Current DACs (IDAC)	Current DACs (IDAC)	Current DACs (IDAC)	Current DACs (IDAC)
	V HIGH /V LOW IDAC Accuracy	MFR_IDAC_V LOW/HIGH = 0x40 or 0x7F		-1		1	%
	V HIGH /V LOW IDAC Program Range			-64		63	μA
	SETCUR IDAC Program Range			0		31	μA
LSB	V HIGH /V LOW IDAC LSB SETCUR IDAC LSB				1 1		μA μA
Oscillator and Phase-Locked Loop	Oscillator and Phase-Locked Loop	Oscillator and Phase-Locked Loop	Oscillator and Phase-Locked Loop	Oscillator and Phase-Locked Loop	Oscillator and Phase-Locked Loop	Oscillator and Phase-Locked Loop	Oscillator and Phase-Locked Loop
I FREQ	FREQ Pin Output Current		l	19	20	21	μA
	Nominal Frequency	V SYNC = 0V, R FREQ = 51.1k		230	250	270	kHz
f LOW	Low Fixed Frequency	V SYNC = 0V, R FREQ = 27.4k		55	70	85	kHz
f HIGH	High Fixed Frequency	V SYNC = 0V, R FREQ = 105k		640	710	780	kHz

Rev. B

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25°C, V HIGH = 48V, V RUN = 5V unless otherwise noted. (Note 2)

SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	UNITS
	Synchronizable Frequency	SYNC = External Clock	l	60		750	kHz
	Spread Spectrum Frequency Modulation Range	V SYNC = 5V, R FREQ = 51.1k, MFR_SSFM = 0x00		-12		12	%
θ 2 - θ 1	Phase 2 Relative to Phase 1				180		Deg
θ 3 - θ 1	Phase 3 Relative to Phase 1				60		Deg
θ 4 - θ 1	Phase 4 Relative to Phase 1				240		Deg
θ 5 - θ 1	Phase 5 Relative to Phase 1				120		Deg
θ 6 - θ 1	Phase 6 Relative to Phase 1				300		Deg
θ CLKOUT - θ 1	CLKOUT Phase to Phase 1				30		Deg
	Clock Output High Voltage	I LOAD = 0.5mA		V5 - 0.2	V5		V
	Clock Output Low Voltage	I LOAD = -0.5mA				0.2	V
	SYNC Pin Input Threshold SYNC Pin Input Resistance	SYNC Pin Rising SYNC Pin Falling		2	100	0.8	V V kΩ
Power Good and FAULT	Power Good and FAULT	Power Good and FAULT	Power Good and FAULT	Power Good and FAULT	Power Good and FAULT	Power Good and FAULT	Power Good and FAULT
	PGOOD Voltage Low	I PGOOD = 2mA			0.1	0.3	V
	PGOOD Leakage Current	V PGOOD = 5V				±1	μA
	PGOOD Trip Level, VFB HIGH /VFB LOW With Respect to the Regulated Voltage	VFB HIGH /VFB LOW Ramping Negative VFB HIGH /VFB LOW Ramping Positive			-10 10		% %
	PGOOD Delay	PGOOD Pin High to Low			40		μs
	FAULT Voltage Low	I FAULT = 2mA			0.1	0.3	V
	FAULT Voltage Leakage Current	V FAULT = 5V				±1	μA
	FAULT Delay	FAULT Pin High to Low			120		μs
	V LOW OV Comparator Threshold			1.15	1.2	1.25	V
	V LOW OV Comparator Hysteresis	V OVLOW > 1.2V			5		μA
	V HIGH OV Comparator Threshold			1.15	1.2	1.25	V
	V HIGH OV Comparator Hysteresis	V OVHIGH > 1.2V			5		μA
	V HIGH UV Comparator Threshold			1.15	1.2	1.25	V
	V HIGH UV Comparator Hysteresis	V UVHIGH < 1.2V			5		μA
PWM Outputs	PWM Outputs	PWM Outputs	PWM Outputs	PWM Outputs	PWM Outputs	PWM Outputs	PWM Outputs
	PWM Output High Voltage	I LOAD = 0.5mA	l	V5 - 0.5			V
	PWM Output Low Voltage PWM Output Current in Hi-Z State	I LOAD = -0.5mA	l			0.5 ±5	V μA
DIGITAL I/O: CSB, SCLK, SDI, SDO	DIGITAL I/O: CSB, SCLK, SDI, SDO	DIGITAL I/O: CSB, SCLK, SDI, SDO	DIGITAL I/O: CSB, SCLK, SDI, SDO	DIGITAL I/O: CSB, SCLK, SDI, SDO	DIGITAL I/O: CSB, SCLK, SDI, SDO	DIGITAL I/O: CSB, SCLK, SDI, SDO	DIGITAL I/O: CSB, SCLK, SDI, SDO
V IL	Digital Input Low Voltage	Pins CSB, SCLK, SDI				0.5	V
V IH	Digital Input High Voltage	Pins CSB, SCLK, SDI		1.8			V
V OL	Digital Output Voltage Low	Pin SDO, Sinking 1mA				0.3	V
R CSB	CSB Pin Pull-Up Resistor			300			kΩ
R SCLK	SCLK Pin Pull-Down Resistor			300			kΩ
R SDI	SDI Pin Pull-Down Resistor				300		kΩ

Thermal Information

The LTC7871 has a temperature sensor integrated on the IC, to sense the die temperature. When the die temperature exceeds 180°C, all switching actions stop, and all PWM pins become Hi-Z, thus turning off all external MOSFETs. At the same time, all the channels are disconnected from the IMON pins, and the SS and ITH HIGH / ITH LOW pins continue to function normally, so as not to interfere with other LTC7871 chips that may reference the common pins. When the temperature drops 15°C below the trip threshold, normal operation resumes.

The Typical Application on the first page of this data sheet is a basic LTC7871 application circuit. In general, external component selection is driven by the load requirements, and begins with the DCR or R SENSE and inductor value. Next, power MOSFETs are selected. Finally, V HIGH and VLOW capacitors are selected.

Typical Application

High Voltage Bidirectional Controller with Programming and Monitoring Functions

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
LTC7871	Analog Devices	64-Lead (10mm × 10mm) Plastic LQFP
LTC7871E	Analog Devices	—
LTC7871ELWE	Analog Devices	—
LTC7871H	Analog Devices	—
LTC7871HLWE	Analog Devices	—
LTC7871I	Analog Devices	—
LTC7871ILWE	Analog Devices	—
LTC7871J	Analog Devices	—
LTC7871JLWE	Analog Devices	—
LTC7871S	Analog Devices	—

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