Voltage Converter. LM73605-Q1 Datasheet

LM73605-Q1 Converter. Datasheet pdf. Equivalent

LM73605-Q1 Datasheet
Recommendation LM73605-Q1 Datasheet
Part LM73605-Q1
Description Synchronous Step-Down Voltage Converter
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LM73605-Q1, LM73606-Q1
SNVSB12A – NOVEMBER 2017 – REVISED DECEMBER 2018
LM7360x-Q1 3.5-V to 36-V, 5-A or 6-A Synchronous
Step-Down Voltage Converter
1 Features
1 AEC-Q100 Qualified for Automotive Applications
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
– Device HBM ESD Classification Level 2 kV
– Device CDM ESD Classification Level C5
• Wettable Flanks QFN Package (WQFN)
• Low EMI and Low Switching Noise
• Low Quiescent Current
– 0.8 µA in Shutdown (typical)
– 15 µA in Active Mode With No Load (typical)
• Wide Voltage Conversion Range:
– tON-MIN = 60 ns (typical)
– tOFF-MIN = 70 ns (typical)
• Low MOSFET ON-Resistance:
– RDS_ON_HS = 53 m(typical)
– RDS_ON_LS = 31 m(typical)
• Adjustable Frequency Range: 350 kHz to 2.2 MHz
• Pin-Selectable Auto Mode or Forced PWM Mode
• Start-up into Pre-Biased Load, Fixed or Adjustable
Soft-Start Time, and Tracking
• Synchronizable to External Clock, Internal
Compensation, Power-Good Flag, and Precision
Enable
• Cycle-by-Cycle Current Limiting, Hiccup, UVLO,
and Thermal Shutdown Protections
• Create a Custom Design With the WEBENCH®
Power Designer using LM73605-Q1 or LM73606-
Q1
VIN
CIN
CVCC
Simplified Schematic
PVIN
EN
PGND
PGOOD
SW
CBOOT
BIAS
L
CBOOT
COUT
VOUT
SS/TRK
SYNC/
MODE
VCC
RT
FB
AGND
RFBT
RFBB
Copyright © 2017, Texas Instruments Incorporated
1
2 Applications
• Automotive Distributed Power Applications
• Battery-Powered Applications
• General-Purpose Wide VIN Applications
3 Description
The LM73605-Q1/LM73606-Q1 family of devices are
easy-to-use synchronous step-down DC-DC
converters capable of driving up to 5 A (LM73605-
Q1) or 6 A (LM73606-Q1) of load current from a
supply voltage ranging from 3.5 V to 36 V. The
LM73605-Q1/LM73606-Q1 provide exceptional
efficiency and output accuracy in a very small
solution size. Peak current-mode control is employed.
Additional features such as adjustable switching
frequency, synchronization to an external clock,
FPWM option, power-good flag, precision enable,
adjustable soft start, and tracking provide both flexible
and easy-to-use solutions for a wide range of
applications. Automatic frequency foldback at light
load and optional external bias improve efficiency
over the entire load range. The family requires few
external components and has a pinout designed for
simple PCB layout with optimal EMI and thermal
performance. Protection features include thermal
shutdown, input undervoltage lockout, cycle-by-cycle
current limiting, and hiccup short-circuit protection.
The LM73605-Q1 and LM73606-Q1 devices are pin-
to-pin compatible for easy current scaling.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM73605-Q1
LM73606-Q1
WQFN (30)
Wettable Flanks
6.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load Current
VOUT = 5 V, VIN = 12 V, Auto Mode
100
95
90
85
80
75
70
65
60 Freq = 400 kHz
55 Freq = 2.2 MHz
50
0.001
0.01 0.02 0.05 0.1 0.2 0.5 1 2 3 4 5
Load Current (A)
EFF_
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



etcTI LM73605-Q1
LM73605-Q1, LM73606-Q1
SNVSB12A – NOVEMBER 2017 – REVISED DECEMBER 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 6
6.6 Timing Characteristics............................................... 7
6.7 Switching Characteristics .......................................... 8
6.8 System Characteristics ............................................. 8
6.9 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 11
7.1 Overview ................................................................. 11
7.2 Functional Block Diagram ....................................... 11
7.3 Feature Description................................................. 12
7.4 Device Functional Modes........................................ 24
8 Application and Implementation ........................ 26
8.1 Application Information............................................ 26
8.2 Typical Application ................................................. 26
9 Power Supply Recommendations...................... 44
10 Layout................................................................... 44
10.1 Layout Guidelines ................................................. 44
10.2 Layout Example .................................................... 47
11 Device and Documentation Support ................. 48
11.1 Device Support...................................................... 48
11.2 Related Documentation ....................................... 48
11.3 Related Links ........................................................ 48
11.4 Receiving Notification of Documentation Updates 48
11.5 Community Resources.......................................... 49
11.6 Trademarks ........................................................... 49
11.7 Electrostatic Discharge Caution ............................ 49
11.8 Glossary ................................................................ 49
12 Mechanical, Packaging, and Orderable
Information ........................................................... 49
4 Revision History
Changes from Original (November 2017) to Revision A
Page
• Deleted "Operating" from "Junction temperature row" in Abs Max ....................................................................................... 5
• Deleted Operating junction temperature, TJ from ROC table ................................................................................................. 5
2 Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
Product Folder Links: LM73605-Q1 LM73606-Q1



etcTI LM73605-Q1
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5 Pin Configuration and Functions
LM73605-Q1, LM73606-Q1
SNVSB12A – NOVEMBER 2017 – REVISED DECEMBER 2018
PIN
NO. NAME
1, 2, 3, 4, 5
SW
6 CBOOT
7 VCC
8 BIAS
9 RT
10 SS/TRK
11
12–15,
27–30
16
FB
NC
PGOOD
RNP Package
30-Pin Wettable Flanks QFN (WQFN) 6 mm × 4 mm × 0.8 mm
Top View
NC NC NC NC
30 29 28 27
SW 1
26 PGND
SW 2
25 PGND
SW 3
24 PGND
SW 4
23 PGND
SW 5
22 PVIN
CBOOT 6
DAP
21 PVIN
VCC 7
20 PVIN
BIAS 8
19 AGND
RT 9
SS/TRK 10
FB 11
18 EN
17 SYNC/
MODE
16 PGOOD
12 13 14 15
NC NC NC NC
I/O (1)
Pin Functions
DESCRIPTION
P
Switching output of the regulator. Internally connected to source of the HS FET and drain of the LS
FET. Connect to power inductor and bootstrap capacitor.
P
Bootstrap capacitor connection for HS FET driver. Connect a high-quality 470-nF capacitor from
this pin to the SW pin.
Output of internal bias supply. Used as supply to internal control circuits and drivers. Connect a
P high-quality 2.2-µF capacitor from this pin to GND. TI does not recommend loading this pin by
external circuitry.
Optional BIAS LDO supply input. TI recommends tying to VOUT when 3.3 V VOUT 18 V, or tie to
P an external 3.3-V or 5-V rail if available, to improve efficiency. BIAS pin voltage must not be
greater than VIN. Tie to ground when not in use.
A
Switching frequency setting pin. Place a resistor from this pin to ground to set the switching
frequency. If floating, the default switching frequency is 500 kHz. Do not short to ground.
Soft-start control pin. Leave this pin floating for a fixed internal soft-start ramp. An external
A
capacitor can be connected from this pin to ground to extend the soft start time. A 2-µA current
sourced from this pin charges the capacitor to provide the ramp. Connect to external ramp for
tracking. Do not short to ground.
I
Feedback input for output voltage regulation. Connect a resistor divider to set the output voltage.
Never short this pin to ground during operation.
No internal connection. Connect to ground net and copper to improve heat sinking and board-level
reliability.
Open drain power-good flag output. Connect to suitable voltage supply through a current limiting
O resistor. High = VOUT regulation OK, Low = VOUT regulation fault. PGOOD = LOW when EN = low
and VIN > 2 V.
(1) A = Analog, O = Output, I = Input, G = Ground, P = Power
Copyright © 2017–2018, Texas Instruments Incorporated
Product Folder Links: LM73605-Q1 LM73606-Q1
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