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MAX5053BEUA

P1-P3P4-P6P7-P9P10-P12P13-P13
General Description
The MAX5052/MAX5053 current-mode PWM controllers
contain all the control circuitry required for the design of
wide-input-voltage isolated and nonisolated power
supplies. The MAX5052 is well suited for universal input
(rectified 85VAC to 265VAC) or telecom (-36VDC to
-72VDC) power supplies. The MAX5053 is well suited for
low-input-voltage (10.8VDC to 24VDC) power supplies.
The MAX5052/MAX5053 contain an internal error ampli-
fier that regulates the tertiary winding output voltage.
This implements a primary-side regulated, isolated
power supply, eliminating the need for an optocoupler.
An input undervoltage lockout (UVLO) is provided for
programming the input-supply start voltage and to
ensure proper operation during brownout conditions.
The input-supply start voltage is externally programma-
ble with a voltage-divider. To shutdown the device, the
UVLO pin is pulled low. Internal digital soft-start
reduces output voltage overshoot. The internal thermal
shutdown circuit protects the device in the event the
junction temperature exceeds +130°C.
The MAX5052 has an internal bootstrap UVLO with
large hysteresis that requires a minimum voltage of
23.6V for startup. The MAX5053 does not have the
internal bootstrap UVLO and can be biased directly
from a minimum voltage of 10.8V.
The 262kHz switching frequency is internally trimmed to
±12% accuracy; this allows the optimization of the
magnetic and filter components resulting in compact,
cost-effective power supplies. The MAX5052A/
MAX5053A are offered with a 50% maximum duty-cycle
limit. The MAX5052B/MAX5053B are offered with a 75%
maximum duty-cycle limit. These devices are available
in 8-pin µMAX packages and operate over the -40°C to
+85°C temperature range.
Applications
Features
♦ Available in a Tiny 8-Pin µMAX Package
♦ Current-Mode Control
♦ 50W Output Power
♦ Universal Offline Input Voltage Range
Rectified 85VAC to 265VAC (MAX5052)
♦ V
IN
Directly Driven from 10.8V to 24V Input
(MAX5053)
♦ Digital Soft-Start
♦ Programmable Input Startup Voltage
♦ Internal Bootstrap UVLO with Large Hysteresis
(MAX5052)
♦ Internal Error Amplifier with 1% Accurate
Reference
♦ Thermal Shutdown
♦ 45µA (typ) Startup Supply Current
♦ 1.4mA (typ) Operating Supply Current
♦ Fixed Switching Frequency of 262kHz ±12%
♦ 50% Maximum Duty-Cycle Limit
(MAX5052A/MAX5053A)
♦ 75% Maximum Duty-Cycle Limit
(MAX5052B/MAX5053B)
♦ 60ns Cycle-by-Cycle Current-Limit Response Time
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2590; Rev 1; 11/03
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.
Functional Diagram/Typical Operating Circuit/Selector
Guide appear at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX5052AEUA -40°C to +85°C 8 µMAX
MAX5052BEUA -40°C to +85°C 8 µMAX
MAX5053AEUA -40°C to +85°C 8 µMAX
MAX5053BEUA -40°C to +85°C 8 µMAX
NDRV
GNDCS
1
2
8
7
V
IN
V
CC
FB
COMP
UVLO/EN
µMAX
TOP VIEW
3
4
6
5
MAX5052
MAX5053
Pin Configuration
Warning: The MAX5052/MAX5053 are designed to work with
high voltages. Exercise caution.
Universal Input AC
Power Supplies
Isolated Telecom Power
Supplies
Networking Systems
Computer Systems/
Servers
Industrial Power
Conversion
Isolated Keep-Alive
Circuits
12V Boost Regulators
12V SEPIC Regulators
EVALUATION KIT
AVAILABLE
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +12V (for MAX5052, V
IN
must first be brought up to 23.6V for startup), 10nF bypass capacitors at V
IN
and V
CC
, C
NDRV
= 0,
V
UVLO
= +1.4V, V
FB
= +1.0V, V
COMP
= floating, V
CS
= 0V, typical values are measured at T
A
= +25°C, T
A
= -40°C to + 85°C, unless
otherwise noted.) (Note 1)
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.
V
IN
to GND .............................................................-0.3V to +30V
V
CC
to GND............................................................-0.3V to +13V
FB, COMP, UVLO, CS to GND .................................-0.3V to +6V
NDRV to GND.............................................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
UNDERVOLTAGE LOCKOUT/STARTUP
Bootstrap UVLO Wake-Up Level
V
SUVR
V
IN
rising (MAX5052 only)
19.68 21.6 23.60
V
Bootstrap UVLO Shutdown Level
V
SUVF
V
IN
falling (MAX5052 only)
9.05 9.74 10.43
V
UVLO/EN Wake-Up Threshold V
ULR2
UVLO/EN rising
1.188 1.28 1.371
V
UVLO/EN Shutdown Threshold V
ULF2
UVLO/EN falling
1.168 1.23 1.291
V
UVLO/EN Input Current I
UVLO
T
J
= +125°C 25 nA
UVLO/EN Hysteresis 50 mV
V
IN
Supply Current In
Undervoltage Lockout
I
START
V
IN
= +19V, for MAX5052 only when in
bootstrap UVLO
45 90 µA
V
IN
Range V
IN
10.8
24 V
t
EXTR
UVLO/EN steps up from +1.1V to +1.4V 12
UVLO/EN Propagation Delay
t
EXTF
UVLO/EN steps down from +1.4V to +1.1V 1.8
µs
t
BUVR
V
IN
steps up from +9V to +24V 5
Bootstrap UVLO Propagation
Delay
t
BUVF
V
IN
steps down from +24V to +9V 1
µs
INTERNAL SUPPLY
V
CC
Regulator Set Point V
CCSP
V
IN
= +10.8V to +24V, sinking 1µA to 20mA
from V
CC
7
10.5
V
V
IN
Supply Current After Startup I
IN
V
IN
= +24V 1.4 2.5 mA
Shutdown Supply Current UVLO/EN = low 90 µA
GATE DRIVER
R
ON
(
LOW
)
Measured at NDRV sinking, 100mA 2 4
Driver Output Impedance
R
ON
(
HIGH
)
Measured at NDRV sourcing, 20mA 4 12
Ω
Driver Peak Sink Current 1A
Driver Peak Source Current
0.65
A
PWM COMPARATOR
Comparator Offset Voltage
VO
PWM
V
COMP
- V
CS
1.15 1.38 1.70
V
CS Input Bias Current I
CS
V
CS
= 0V -2 +2 µA
Comparator Propagation Delay t
PWM
V
CS
= +0.1V 60 ns
Minimum On-Time
t
ON
(
MIN
)
150
ns
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
_______________________________________________________________________________________ 3
Note 1: All devices are 100% tested at T
A
= +85°C. All limits over temperature are guaranteed by characterization.
Note 2: V
REF
is measured with FB connected to the COMP pin (see Functional Diagram).
Note 3: The MAX5052 is intended for use in universal input power supplies. The internal clamp circuit is used to prevent the boot-
strap capacitor (C1 in Figure 1) from charging to a voltage beyond the absolute maximum rating of the device when
EN/UVLO is low. The maximum current to V
IN
(hence to clamp) when UVLO is low (device in shutdown) must be externally
limited to 2mA, max. Clamp currents higher than 2mA may result in clamp voltage higher than 30V, thus exceeding the
absolute maximum rating for V
IN
. For the MAX5053, do not exceed the 24V maximum operating voltage of the device.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V (for MAX5052, V
IN
must first be brought up to 23.6V for startup), 10nF bypass capacitors at V
IN
and V
CC
, C
NDRV
= 0,
V
UVLO
= +1.4V, V
FB
= +1.0V, V
COMP
= floating, V
CS
= 0V, typical values are measured at T
A
= +25°C, T
A
= -40°C to + 85°C, unless
otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
CURRENT-LIMIT COMPARATOR
Current-Limit Trip Threshold V
CS
262 291
320 mV
CS Input Bias Current I
CS
V
CS
= 0V -2 +2 µA
Propagation Delay From
Comparator Input to NDRV
t
PWM
50mV overdrive 60 ns
Switching Frequency f
SW
230 262
290 kHz
MAX505_A 50
50.5
Maximum Duty Cycle D
MAX
MAX505_B 75 76
%
V
IN
CLAMP VOLTAGE
V
IN
Clamp Voltage V
INC
2mA sink current, MAX5052 only (Note 3)
24.1 26.1 29.0
V
ERROR AMPLIFIER
Voltage Gain R
LOAD
= 100kΩ 80 dB
Unity-Gain Bandwidth R
LOAD
= 100kΩ, C
LOAD
= 200pF 2
MHz
Phase Margin R
LOAD
= 100kΩ, C
LOAD
= 200pF 65
degrees
FB Input Offset Voltage 3mV
High 2.2 3.5
COMP Pin Clamp Voltage
Low 0.4 1.1
V
Source Current 0.5 mA
Sink Current 0.5 mA
Reference Voltage V
REF
(Note 2)
1.218 1.230 1.242
V
Input Bias Current 50 nA
COMP Short-Circuit Current 8mA
THERMAL SHUTDOWN
Thermal-Shutdown Temperature 130
°C
Thermal Hysteresis 25 °C
DIGITAL SOFT-START
Soft-Start Duration
15,872
clock
cycles
Reference Voltage Steps During
Soft-Start
31
steps
Reference Voltage Step 40 mV
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX5053BEUA

Mfr. #:
Buy MAX5053BEUA
Manufacturer:
Maxim Integrated
Description:
Switching Controllers w/Error Amplifier
Lifecycle:
New from this manufacturer.
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