Boost Converter. MAX5072 Datasheet

MAX5072 Converter. Datasheet pdf. Equivalent

Part MAX5072
Description Dual-Output Buck or Boost Converter
Feature 19-3503; Rev 2; 2/06 KIT www.DataSheet4U.com ATION EVALU E L B A IL AVA 2.2MHz, Dual-Output Buck o.
Manufacture Maxim Integrated Products
Datasheet
Download MAX5072 Datasheet




MAX5072
19-3503; Rev 2; 2/06
www.DataSheetE4UVA.AcLoVUmAAILTAIOBNLEKIT
2.2MHz, Dual-Output Buck or Boost
Converter with POR and Power-Fail Output
General Description
The MAX5072 is a dual-output DC-DC converter with inte-
grated high-side n-channel power MOSFETs. Each output
can be configured either as a buck converter or a boost
converter. The MAX5072 is designed to manage the
power requirements of xDSL modems. The wide 5.5V to
23V input voltage range allows for the use of inexpensive
AC adapters to power the device in xDSL modem appli-
cations. Each output is programmable down to 0.8V in the
buck mode and up to 28V in the boost mode with an out-
put voltage accuracy of ±1%. In the buck mode, convert-
er 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 the xDSL frequency band of operation. Each output
operates 180° out-of-phase, thus reducing input-capaci-
tor 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
MAX5072 ICs in master-slave configuration.
The MAX5072 includes an internal digital soft-start that
reduces inrush current, eliminates output-voltage over-
shoot, and ensures monotonic rise in output voltage dur-
ing power-up. The device includes a power-good output
and power-on reset as well as manual reset. In addition,
each converter output can be shut down individually. The
MAX5072 features a "dying gasp" output, which goes low
when the input voltage drops below a preprogrammed
voltage. Protection features include output short-circuit
protection for buck mode and maximum duty-cycle limit
for boost operation, as well as thermal shutdown.
The MAX5072 is available in a thermally enhanced 32-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
xDSL Modems
xDSL Routers
Point-of-Load DC-DC Converters
Ordering Information
PART
TEMP RANGE
MAX5072ETJ -40°C to +85°C
*EP = Exposed pad.
PIN-PACKAGE
PKG
CODE
32 Thin QFN-EP*
(5mm x 5mm)
T3255-4
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 Independent Converter
Shutdown
SYNC Input, Power-On Reset, Manual Reset, And
Power-Fail Output
Short-Circuit Protection (Buck)/Maximum Duty-
Cycle Limit (Boost)
Thermal Shutdown
Thermally Enhanced 32-Pin Thin QFN Package
Dissipates up to 2.7W at +70°C
Pin Configuration
TOP VIEW
24 23 22 21 20 19 18 17
PGOOD1 25
16 MR
SOURCE1 26
15 BYPASS
SOURCE1 27
14 VL
PGND 28
SGND 29
MAX5072
13 VL
12 V+
PGND 30
11 OSC
SOURCE2 31
10 PFI
SOURCE2 32
9 SYNC
12345678
Ordering Information continued at end of data sheet.
THIN QFN
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.



MAX5072
www.DataSheet4U.com
2.2MHz, Dual-Output Buck or Boost
Converter with POR and Power-Fail Output
ABSOLUTE MAXIMUM RATINGS
V+ to PGND............................................................-0.3V to +25V
SGND to PGND .....................................................-0.3V to +0.3V
SOURCE2, DRAIN2 Peak Current ..............................3A for 1ms
VL, BYPASS to SGND Short Circuit............................Continuous
VL to SGND...................-0.3V to the lower of +6V or (V+ + 0.3V)
BST1/VDD1, BST2/VDD2, DRAIN_, PFO, RST, PGOOD1 to
SGND .................................................................-0.3V to +30V
BST1/VDD1 to SOURCE1,
Continuous Power Dissipation (TA = +70°C)
32-Pin Thin QFN (derate 21.3mW/°C above +70°C).....2758mW*
Package Junction-to-Case Thermal Resistance (θJC).......2°C/W
Operating Temperature Ranges:
BST2/VDD2 to SOURCE2 ....................................-0.3V to +6V
SOURCE_ to SGND................................................-0.6V to +25V
EN_ to SGND ................................................-0.3V to (VL + 0.3V)
MAX5072ETJ (TMIN to TMAX)...........................-40°C to +85°C
MAX5072ATJ (TMIN to TMAX).........................-40°C to +125°C
Junction Temperature ......................................................+150°C
CLKOUT, BYPASS, OSC, FSEL1, COMP1,
COMP2, PFI, MR, SYNC, FB_ to SGND....-0.3V to (VL + 0.3V)
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
SOURCE1, DRAIN1 Peak Current ..............................5A for 1ms
*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 = 0, PGND = SGND, CBYPASS = 0.22µF, CVL = 4.7µF (ceramic),
ROSC = 10k(circuit of Figure 1), TA = TJ = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SYSTEM SPECIFICATIONS
Input Voltage Range
(Note 2)
V+
VL = V+
5.5 23
V
4.5 5.5
Operating Supply Current
V+ Standby Supply Current
Efficiency
STARTUP/VL REGULATOR
IQ
ISTBY
η
VL unloaded, no switching,
VFB_ = 1V, V+ = 12V, ROSC = 60k
EN_ = 0, MR, PFO, and PGOOD_ floating,
V+ = 12V, ROSC = 60kΩ (MAX5072ETJ)
EN_ = 0, MR, PFO, and PGOOD_ floating,
V+ = 12V, ROSC = 60kΩ (MAX5072ATJ)
VOUT1 = 3.3V at 1.5A,
VOUT2 = 2.5V at 0.75A
(fSW = 1.25MHz)
V+ = VL = 5V
V+ = 12V
V+ = 16V
2.2 1.2 mA
0.6 1.4
mA
0.6 1.4
82
80 %
78
VL Undervoltage Lockout Trip
Level
UVLO VL falling
3.95 4.1 4.25
V
VL Undervoltage Lockout
Hysteresis
175 mV
VL Output Voltage
BYPASS OUTPUT
BYPASS Voltage
BYPASS Load Regulation
SOFT-START
VL V+ = 5.5V to 23V, ISOURCE = 0 to 40mA
4.9 5.2 5.5
VBYPASS
VBYPASS
IBYPASS = 0, ROSC = 60kΩ (MAX5072ETJ)
IBYPASS = 0, ROSC = 60kΩ (MAX5072ATJ)
0 IBYPASS 50µA, ROSC = 60k
1.98 2.00 2.02
1.975 2.00 2.025
0 2 10
V
V
mV
Digital Ramp Period
Internal 6-bit DAC
2048
fOSC
clock
cycles
Soft-Start Steps
64 steps
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