Voltage Converter. LM73606 Datasheet

LM73606 Converter. Datasheet pdf. Equivalent

LM73606 Datasheet
Recommendation LM73606 Datasheet
Part LM73606
Description Synchronous Step-Down Voltage Converter
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LM73605, LM73606
SNVSAH5 – SEPTEMBER 2017
LM73605/LM73606 3.5-V to 36-V, 5-A or 6-A Synchronous
Step-Down Voltage Converter
1 Features
1 Synchronous Rectification
• Wettable Flanks QFN Package (WQFN)
• 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)
• External Bias Input to Improve Efficiency
• Pin-Selectable Auto Mode or Forced PWM
Operation
• Adjustable Frequency Range: 350 kHz to 2.2 MHz
• Synchronizable to External Clock
• Internal Compensation
• Power-Good Flag
• Precision Enable to Program System UVLO
• Flexible Soft-Start Features:
– Start-up into Pre-Biased Load
– Fixed or Adjustable Soft-Start Time
– Output Voltage Tracking
• Cycle-by-Cycle Current Limiting
• Short-Circuit Protection With Hiccup Mode
• Thermal Shutdown Protection
• Create a Custom Design With the WEBENCH®
Power Designer using LM73605 or LM73606
2 Applications
• Industrial Distributed Power Applications
• Telecommunications Systems
• General-Purpose Wide VIN Regulation
3 Description
The LM73605/LM73606 family of devices are easy-
to-use synchronous step-down DC-DC converters
capable of driving up to 5 A (LM73605) or 6 A
(LM73606) of load current from a supply voltage
ranging from 3.5 V to 36 V. The LM73605/LM73606
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 and LM73606 devices are
pin-to-pin compatible for easy current scaling.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM73605
LM73606
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.
VIN
CIN
CVCC
Simplified Schematic
PVIN
EN
PGND
SW
CBOOT
L
CBOOT
COUT
PGOOD
BIAS
VOUT
SS/TRK
SYNC/
MODE
VCC
RT
FB
AGND
RFBT
RFBB
Copyright © 2017, Texas Instruments Incorporated
Efficiency vs Load Current
VOUT = 5 V, fSW = 500 kHz, Auto Mode
100
95
90
85
80
75
70
65
60
VIN = 12 V
55 VIN = 24 V
50
0.001
0.01 0.02 0.05 0.1 0.2 0.5 1 2 3 4 56
Load Current (A)
Eff_
1
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 LM73606
LM73605, LM73606
SNVSAH5 – SEPTEMBER 2017
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 .................................................. 6
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........................................ 23
8 Application and Implementation ........................ 25
8.1 Application Information............................................ 25
8.2 Typical Application ................................................. 25
9 Power Supply Recommendations...................... 39
10 Layout................................................................... 39
10.1 Layout Guidelines ................................................. 39
10.2 Layout Example .................................................... 42
11 Device and Documentation Support ................. 43
11.1 Device Support...................................................... 43
11.2 Related Documentation ....................................... 43
11.3 Related Links ........................................................ 43
11.4 Receiving Notification of Documentation Updates 43
11.5 Community Resources.......................................... 44
11.6 Trademarks ........................................................... 44
11.7 Electrostatic Discharge Caution ............................ 44
11.8 Glossary ................................................................ 44
12 Mechanical, Packaging, and Orderable
Information ........................................................... 45
4 Revision History
DATE
September 2017
REVISION
*
NOTES
Initial release
2 Submit Documentation Feedback
Product Folder Links: LM73605 LM73606
Copyright © 2017, Texas Instruments Incorporated



etcTI LM73606
www.ti.com
5 Pin Configuration and Functions
LM73605, LM73606
SNVSAH5 – SEPTEMBER 2017
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 boot-strap capacitor.
P
Boot-strap 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 will be 500 kHz. Do not short to ground.
Soft-start control pin. Leave this pin floating for a 5-ms 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, Texas Instruments Incorporated
Product Folder Links: LM73605 LM73606
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