Boost Converter. MAX5073 Datasheet

MAX5073 Converter. Datasheet pdf. Equivalent

Part MAX5073
Description Dual-Output Buck or Boost Converter
Feature 19-3504; Rev 2; 2/06 KIT ATION EVALU www.DataSheet4U.com LE B A IL A AV 2.2MHz, Dual-Output Buck o.
Manufacture Maxim Integrated Products
Datasheet
Download MAX5073 Datasheet



MAX5073
MAX5073
EVALUATION KIT AVAILABLE
2.2MHz, Dual-Output Buck or Boost Converter
with Internal Power MOSFETs
General Description
The MAX5073 is a dual-output DC-DC converter with
integrated high-side n-channel power MOSFETs. Each
output can be configured either as a buck converter or a
boost converter. The device is capable of operating from
a wide 5.5V to 23V input voltage range. Each output is
programmable down to 0.8V in the buck mode and up to
28V in the boost mode with an output voltage accuracy
of ±1%. In the buck mode, converter 1 and converter 2
can deliver 2A and 1A, respectively. The output switching
frequency of each converter can be programmed from
200kHz to 2.2MHz to avoid harmonics in a radio power
supply or to reduce the size of the power supply. Each
output operates 180° out-of-phase thus reducing input-
capacitor ripple current, size, and cost. A SYNC input
facilitates external frequency synchronization. Moreover,
a CLKOUT output provides out-of-phase clock signal
with respect to converter 2, allowing four-phase operation
using two MAX5073 ICs in master-slave configuration.
The MAX5073 includes an internal digital soft-start that reduc-
es inrush current, eliminates output-voltage overshoot, and
ensures monotonic rise in output voltage during power-up.
The device includes individual shutdown and a power-good
output for each converter. Protection features include output
short-circuit protection for buck mode and maximum duty-
cycle limit for boost operation, as well as thermal shutdown.
The MAX5073 is available in a thermally enhanced 28-pin
thin QFN package that can dissipate 2.7W at +70°C ambi-
ent temperature. The device is rated for operation over the
-40°C to +85°C extended, or -40°C to +125°C automotive
temperature range.
Applications
● Point-of-Load DC-DC Converters
● Telecom Line Card
● Networking Line Card
● Power-Over-Ethernet Postregulation for PDs
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PACKAGE
CODE
MAX5073ETI
-40°C to +125°C
28 Thin QFN-EP*
(5mm x 5mm)
T2855-6
MAX5073ETI+
-40°C to +125°C
28 Thin QFN-EP*
(5mm x 5mm)
T2855-6
*EP = Exposed pad.
+Denotes lead-free package.
Ordering Information continued at end of data sheet.
Features
● 4.5V to 5.5V or 5.5V to 23V Input Supply
Voltage Range
● 0.8V (Buck) to 28V (Boost) Output Voltage
● Two Independent Output DC-DC Converters
with Internal Power MOSFETs
● Each Output can be Configured in Buck or Boost
Mode
● IOUT1 and IOUT2 of 2A and 1A (Respectively) in
Buck Mode
● 180° Out-of-Phase Operation
● Clock Output for Four Phase Operation
● Switching Frequency Programmable from 200kHz to
2.2MHz
● Digital Soft-Start and Sync Input
● Individual Converter Shutdown and Power-Good
Output
● Short-Circuit Protection (Buck)/Maximum Duty-Cycle
Limit (Boost)
● Thermal Shutdown
● Thermally Enhanced 28-Pin Thin QFN Package
Dissipates up to 2.7W at +70°C
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
PGOOD2 22
SOURCE1 23
SOURCE1 24
SGND 25
PGND 26
SOURCE2 27
SOURCE2 28
MAX5073
14 BYPASS
13 VL
12 VL
11 V+
10 OSC
9 N.C.
8 SYNC
1234567
THIN QFN
19-3504; Rev 3; 5/14



MAX5073
MAX5073
2.2MHz, Dual-Output Buck or Boost Converter
with Internal Power MOSFETs
Absolute Maximum Ratings
V+ to PGND...........................................................-0.3V to +25V
SGND to PGND.....................................................-0.3V to +0.3V
VL to SGND..................-0.3V to the lower of +6V or (V+ + 0.3V)
BST1/VDD1, BST2/VDD2, DRAIN_, PGOOD2, PGOOD1 to
SGND.................................................................-0.3V to +30V
BST1/VDD1 to SOURCE1,
BST2/VDD2 to SOURCE2 ..................................-0.3V to +6V
SOURCE_ to SGND..............................................-0.6V to +25V
EN_ to SGND............................................-0.3V to (VL to +0.3V)
CLKOUT, BYPASS, OSC, COMP1,
COMP2, SYNC, FB_ to SGND................-0.3V to (VL + 0.3V)
SOURCE1, DRAIN1 Peak Current.............................5A for 1ms
SOURCE2, DRAIN2 Peak Current.............................3A for 1ms
VL, BYPASS to SGND Short Circuit..........................Continuous
Continuous Power Dissipation (TA = +70°C)
28-Pin Thin QFN (derate 21.3mW/°C above +70°C)... 2758mW*
Package Junction-to-Case Thermal Resistance (θJC).......2°C/W
Operating Temperature Ranges:
MAX5073ETI (TMIN to TMAX).......................... -40°C to +85°C
MAX5073ATI (TMIN to TMAX)........................ -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
*As per JEDEC51 standard.
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.
Electrical Characteristics
(V+ = VL = 5.2V or V+ = 5.5V to 23V, EN_ = VL, SYNC = GND, IVL = 0mA, PGND = SGND, CBYPASS = 0.22µF, CVL = 4.7µF (ceramic),
ROSC = 10kΩ (circuit of Figure 1), TA = TJ = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER
SYSTEM SPECIFICATIONS
Input Voltage Range
Operating Supply Current
V+ Standby Supply Current
Efficiency
STARTUP/VL REGULATOR
VL Undervoltage Lockout Trip
Level
VL Undervoltage Lockout
Hysteresis
VL Output Voltage
BYPASS OUTPUT
BYPASS Voltage
BYPASS Load Regulation
SOFT-START
Digital Ramp Period
Soft-Start Steps
SYMBOL
CONDITIONS
V+
IQ
ISTBY
η
(Note 2)
VL = V+
VL unloaded, no switching, VFB_ = 1V,
V+ = 12V, ROSC = 60kΩ
EN_ = 0, PGOOD_ floating, V+ = 12V,
ROSC = 60kΩ (MAX5073ETI)
EN_ = 0, PGOOD_ floating, V+ = 12V,
ROSC = 60kΩ (MAX5073ATI)
VOUT1 = 3.3V at 1.5A,
VOUT2 = 2.5V at 0.75A
(fSW = 1.25MHz)
V+ = VL = 5V
V+ = 12V
V+ = 16V
MIN TYP MAX UNITS
5.5 23.0
V
4.5 5.5
2.2 4 mA
0.6 1.2
mA
0.6 1.4
82
80 %
78
UVLO
VL
VL falling
V+ = 5.5V to 23V, ISOURCE = 0 to 40mA
3.95 4.1 4.25
175
4.9 5.2 5.5
V
mV
V
VBYPASS
∆VBYPASS
IBYPASS = 0, ROSC = 60kΩ (MAX5073ETI)
IBYPASS = 0, ROSC = 60kΩ (MAX5073ATI)
0 ≤ IBYPASS ≤ 50µA, ROSC = 60kΩ
1.98
1.975
0
2.00
2.00
2
2.02
2.025
10
V
mV
Internal 6-bit DAC
2048
64
fOSC
clock
cycles
Steps
www.maximintegrated.com
Maxim Integrated 2







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