LM73605-Q1, LM73606-Q1
SNVSB12B – NOVEMBER 2017 – REVISED MAY 2021
LM7360x-Q1 3.5-V to 36-V, 5-A or 6-A Synchronous
Step-Down Voltage Converter
1 Features
3 Description
•
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)
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, 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 lookout,
cycle-cy-cycle current limiting, and hiccup short-
citcuit protection. The LM73605-Q1 and LM73606-Q1
devices are pin-to-pin compatible for easy current
scaling.
•
•
•
•
•
Low MOSFET ON-resistance:
– RDS_ON_HS = 53 mΩ (typical)
– RDS_ON_LS = 31 mΩ (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
•
•
•
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM73605-Q1
WQFN (30)
Wettable and non-
wettable flanks
6.00 mm × 4.00 mm
LM73606-Q1
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
2 Applications
•
•
•
Automotive distributed power applications
Battery-powered applications
General-purpose wide VIN applications
100
95
90
85
80
75
70
65
L
VIN
VOUT
SW
PVIN
CBOOT
COUT
CIN
EN
CBOOT
BIAS
RT
PGND
PGOOD
SS/TRK
RFBT
60
SYNC/
MODE
Freq = 400 kHz
Freq = 2.2 MHz
FB
55
RFBB
50
VCC
0.001
0.01 0.02 0.05 0.1 0.2
Load Current (A)
0.5
1
2 3 45
CVCC
AGND
EFF_
Efficiency versus Load Current VOUT = 5 V, VIN = 12
V, Auto Mode
Simplified Schematic
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.