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A8600 PDF даташит

Спецификация A8600 изготовлена ​​​​«Allegro MicroSystems» и имеет функцию, называемую «Quadruple Output Regulator».

Детали детали

Номер произв A8600
Описание Quadruple Output Regulator
Производители Allegro MicroSystems
логотип Allegro MicroSystems логотип 

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A8600 Даташит, Описание, Даташиты
A8600
Quadruple Output Regulator with Two High-Side Switches,
BU/ACC Voltage Detectors, and Mute Delay
Features and Benefits
• Four independent, high current switching regulators
• Adjustable 1.0 A/±1.5% always-on asynchronous buck
regulator with an integrated 150 mΩ MOSFET (SW1)
Employs PFM to deliver 3.3 V/40 μA while drawing less
than 50 μA from VIN of 12 V
Operates down to at least 3.6 VIN
• Adjustable 1.5 A/±1.5% asynchronous buck regulator with
an integrated 120 mΩ high-side MOSFET (SW2)
• Adjustable 2.0 A/±1.5% asynchronous buck regulator with
an integrated 110 mΩ MOSFET (SW3)
• Adjustable ±1.5% synchronous buck controller with
integrated gate drivers and current sensing (SW4)
• Fixed 425 kHz, interleaved PWM switching frequency
• EN/SYNC input for PWM frequency scaling
• Adjustable soft-start time for each switching regulator
• All switching regulators provide prebias startup with zero
reverse current
• All switching regulators have overvoltage protection
• External compensation for all switching regulators
Continued on the next page…
Package: 48-pin LQFP (suffix JP)
Description
Designed to provide the power supply requirements of next
generation car audio and infotainment systems, the A8600
provides all the control and protection circuitry to produce
four high current regulators, each with ±1.5% accuracy. The
A8600 includes control circuitry to implement three adjustable,
asynchronous buck regulators with integrated MOSFETs. Also,
the A8600 provides the control circuitry, gate drivers, and
current sensing to implement a synchronous buck controller
with external MOSFETs. In standby mode, the A8600 draws
less than 50 μA from VIN of 12 V while employing pulse
frequency modulation (PFM) to deliver 3.3 V/40 μA via the
always-on regulator, SW1. The always-on regulator operates
down to at least VIN of 3.6 V (VIN falling).
Features of the A8600 include: an EN/SYNC input to either
turn the A8600 on/off or increase/decrease the base pulse
width modulation (PWM) frequency, four adjustable soft-start
times, and four external compensation pins. Output voltage
monitoring of switchers SW2, SW3, and SW4 is provided
by a single, open-drain POK output. In addition, the A8600
provides two high voltage, high-side switches with foldback
overcurrent protection. These two high-side switches actively
block reverse current. The A8600 also provides direct battery
(BU) and switched (accessory) battery (ACC) detectors and
a mute pulse output with an adjustable delay.
Continued on the next page…
Not to scale
A8600-DS, Rev. 3
Switcher 1
(SW1)
Adjustable
Output Voltage
1.0 AAVG / 2.5 APEAK
Always-On
PWM / PFM
Asynchronous
Buck
Regulator
Switcher 2
(SW2)
Adjustable
Output Voltage
1.5 AAVG / 2.5 APEAK
PWM
Asynchronous
Buck
Regulator
Switcher 3
(SW3)
Adjustable
Output Voltage
2.0 AAVG / 2.5 APEAK
PWM
Asynchronous
Buck
Regulator
Switcher 4
(SW4)
Adjustable
Output Voltage
Adjustable ILIM
PWM
Synchronous
Buck
Controller
Charge
Pump
Enable and
Synchronization
(EN/SYNC)
425 kHz
180° Shift
High-Side Switch 1
(S1)
1.0 Ω Total
with
Foldback Limiting
High-Side Switch 2
(S2)
1.0 Ω Total
with
Foldback Limiting
BU and ACC
Detectors
Mute Pulse
with Delay
Figure 1. A8600 major features









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A8600 Даташит, Описание, Даташиты
A8600
Quadruple Output Regulator with Two High-Side Switches,
BU/ACC Voltage Detectors, and Mute Delay
Features and Benefits (continued)
• Power OK (POK) open-drain output with de-glitch
• BU and ACC voltage detectors and comparators
• Mute control with programmable delay
• Two internal high-voltage, high-side NMOS switches
(S1 and S2) with foldback short circuit protection
• High-side switches simultaneously controlled on/off
• High-side switches block reverse current
• Internal charge pump for high-side switch biasing
• Withstands surge voltages up to 40 V
40°C to 85°C ambient operating temperature range
• 150°C maximum junction temperature
• Thermally enhanced, surface mount package
Description (continued)
Protection features of the A8600 include pulse-by-pulse current
limit, hiccup mode short circuit protection, asynchronous diode
protection, BOOT voltage protection, undervoltage lockout, over-
voltage protection and thermal shutdown.
The A8600 is supplied in a low profile 48-pin LQFP package (suffix
JP) with exposed power pad. It is lead (Pb) free, with 100% matte-
tin leadframe plating.
Selection Guide
Part Number
Operating Ambient
Temperature Range
TA, (°C)
A8600EJPTR-T
–40 to 85
*Contact Allegro® for additional packing options.
Package
48-pin LQFP with
exposed
thermal pad
Packing*
1500 pieces per
13-in. reel
Leadframe Plating
100% Matte-Tin
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2









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A8600 Даташит, Описание, Даташиты
A8600
Quadruple Output Regulator with Two High-Side Switches,
BU/ACC Voltage Detectors, and Mute Delay
Specifications
Absolute Maximum Ratings
Thermal Characteristics
Pin-out Diagram and List
Top Level Block Diagram
Typical Application Circuit
SW1/2/3 Detailed Block Diagram
SW4 Detailed Block Diagram
Electrical Characteristics Table
General Specifications
SW1 Regulator
SW2 Regulator
SW3 Regulator
SW4 Controller
S1, S2 Switches
BU and ACC Comparators
CTMR and MUTE
Timing Diagrams
SW1 Normal PWM Operation
SW1 Low IQ and Low IP Operation
SW2/3/4 PWM Operation
S1/2 Operation
BU, ACC, and Mute Operation
Functional Description
Overview
Reference Voltage
PWM Switching Frequency
Enable/Synchronization Input (EN/SYNC)
BIAS Input Pin, Ratings, and Connections
Transconductance Error Amplifier
Slope Compensation
Current Sense Amplifiers
Power MOSFETs
BOOT Regulators
Table of Contents
4 SW1/2/3/4 Pulse Width Modulation (PWM) Mode 27
4
SW1 Low IP PWM Mode
27
4 SW1 Pulse Frequency Modulation (PFM)
5 and Low IQ Mode
27
6 Soft Start (Startup) and Inrush Current Control 28
6 Prebiased Startup
29
7
High-Side Switches (S1 and S2)
29
8
BU and ACC Detectors and MUTE Output
31
9 Power OK (POK) Output
31
9 Protection Features
32
10
Undervoltage Lockout (UVLO)
32
12
Thermal Shutdown (TSDL and TSDH)
32
14 Pulse-by-Pulse Overcurrent Protection (OCP) 32
16 Output Short Circuit (Hiccup Mode) Protection 33
18
BOOT Capacitor Protection
33
18
Asynchronous Diode Protection
34
19
Overvoltage Protection (OVP)
34
20 Application Information
36
20
Design and Component Selection
36
21
22
Setting the Output Voltage (VSWx, RFBAx, RFBBx) 36
Output Inductor (LSWx)
37
23
Output Capacitors (CSWx)
37
24
SW1 Low IQ PFM Ripple Calculation
38
25
Input Capacitors (CINx)
38
25
Asynchronous Diode (DSWx)
39
25
Bootstrap Capacitor (CBOOTx)
40
25 Soft Start and Hiccup Mode Timing (CSSx) 40
25
SW4 External MOSFET Selections
41
26
SW4 Current Sense Resistor
41
26 Compensation Components (RZx, CZx, CPx) 41
26
A Generalized Tuning Procedure
43
26
Power Dissipation and Thermal Calculations
44
26
PCB Component Placement and Routing
45
27 Pin Descriptions Table
47
Pin ESD Structures
49
Package Outline Drawing
50
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3










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