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MAX20419 High-Efficiency, 3-Output,
Low-Voltage DC-DC Converter
General Description Benefits and Features
The MAX20419 is a high-efficiency, 3-output, low-voltage Multiple Functions for Small Size
DC-DC converter IC. OUT1 boosts the input supply to 5V
Synchronous 750mA Boost Converter
at up to 750mA, while two synchronous step-down con-
Fixed at 5V Output
verters operate from a 3.0V to 5.5V input voltage range
Dual Synchronous Buck Converters Up to 3.6A
and provide a 0.8V to 3.8V output voltage range at up to
- Factory Configurable from 0.8V to 3.8V
3.6A. The boost converter achieves 1.9% and the buck
in 25mV Steps
converters achieve 1.4% output error over load, line,
Programmable Windowed Watchdog
and temperature range. The IC features a 2.2MHz fixed-
3.0V to 5.5V Operating Supply Voltage
frequency pulse-width modulation (PWM) mode for better
2.2MHz Operation
noise immunity and load-transient response, and a pulse-
Individual RESET_ Outputs
frequency-modulation mode (skip) for increased efficiency
High-Precision Performance
during light-load operation. The 2.2MHz frequency opera-
- 1.9% Output-Voltage Accuracy (OUT1) and
tion allows the use of all-ceramic capacitors and minimizes
1.4% Output-Voltage Accuracy (OUT2, OUT3)
external components. The programmable spread-spectrum
- 1.3% OV/UV Monitoring (OUT1OUT3, PV)
frequency modulation minimizes radiated electromagnetic
- Excellent Load-Transient Performance
emissions. Integrated low R switches improve effi-
DS(ON)
Diagnostics and Redundant Circuits
ciency at heavy loads, and make the layout a much simpler
ASIL-C Compliant
task with respect to discrete solutions.
Redundant Reference
The IC is offered with factory-preset output voltages (see the
Fail Safe on Open Pins
Ordering Information/Selector Guide for available options).
Shorted Pin Detection on RESET1RESET3
Other features include soft-start, overcurrent, and overtem-
Input Overvoltage Detection
perature protections. The MAX20419 also has several redun-
Robust for the Automotive Environment
dancy and diagnostic features for compatibility with ASIL-
Current Mode, Forced-PWM, and Skip Operation
rated applications.
Overtemperature and Short-Circuit Protection
24-Pin (4mm x 4mm) TQFN with Exposed Pad
Ordering Information/Selector Guide appears at end of data -40C to +125C Automotive Temperature Range
sheet.
Typical Operating Circuit
EN1 OUT1 5.0V
EN2 22F
EN3 PGND
3.3V
2.2H
3.3V
SYNC LX1
4.7F
PV
PGND1
1F
GND
MAX20419
PV[2:3]
2x4.7F
WDS
PV_OV 47nF
WDI
/3
RESET[1:3]
0.47H
LX2
0.47H
OUT2 47F
LX3
47F OUT3
PGND2
PGND3
19-100255; Rev 9; 4/20MAX20419 High-Efficiency, 3-Output,
Low-Voltage, DC-DC Converter
Absolute Maximum Ratings
PV2, PV3 to PGND_ ...............................................-0.3V to +6V GND to PGND ......................................................-0.3V to +0.3V
PV to GND...............................................................-0.3V to +6V LX1 Continuous RMS Current ................................................2A
EN1EN3, SYNC to GND ...........................-0.3V to V + 0.3V LX2, LX3 Continuous RMS Current .......................................3A
PV
RESET1RESET3, WDI, WDS to GND ..................-0.3V to +6V Output Short-Circuit Duration ....................................Continuous
PV_OV to GND ...................................................... -0.3V to +6V Continuous Power Dissipation (T = +70C)
A
OUT1 to PGND1 .....................................................-0.3V to +6V 24-Pin TQFN-EP (derate 30.3mW/C > +70C) ....... 2222mW
OUT2 to PGND2 ....................................... -0.3V to V + 0.3V Operating Temperature Range ......................... -40C to +125C
PV2
OUT3 to PGND3 ....................................... -0.3V to V + 0.3V Junction Temperature ......................................................+150C
PV3
LX1 to PGND1.........................................-0.3V to V + 0.3V Storage Temperature Range ............................ -65C to +150C
OUT1
LX2 to PGND2........................................... -0.3V to V + 0.3V Lead Temperature Range ................................................+300C
PV2
LX3 to PGND3........................................... -0.3V to V + 0.3V
PV3
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
PACKAGE TYPE: 24-PIN TQFN
Package Code T2444+4C
Outline Number 21-0139
Land Pattern Number 90-0022
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient ( ) 36C/W
JA
Junction to Case ( ) 3C/W
JC
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that
a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
Electrical Characteristics
(V = V = V = 3.3V, EN1 = EN2 = EN3 = 3.3V, T = -40C to +125C, unless otherwise noted. Typical values are at
PV PV2 PV3 J
T = +25C (Notes 1 and 3)
A
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V Fully operational 3.0 5.5 V
IN
UVLO Rising 2.7 2.9
R
Undervoltage Lockout (UVLO) V
UVLO Falling 2.4 2.6
F
Shutdown Supply Current I EN1EN3 = low 15 45 70 A
IN
EN1 = high, I = 0mA, skip,
OUT1
Supply Current (IN1) I 70 150 230 A
IN1
watchdog disabled
EN2 = high, I = 0mA, skip,
OUT2
Supply Current (IN2) I 50 125 200 A
IN2
watchdog disabled
EN3 = high, I = 0mA, skip,
OUT3
Supply Current (IN3) I 50 125 200 A
IN3
watchdog disabled
PWM Switching Frequency f Internally generated 2.0 2.2 2.4 MHz
SW
Spread Spectrum SS Factory option enabled 3 %
Maxim Integrated 2
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