MAXIM MAX5052, MAX5053 User Manual

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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 ampli­fier 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 programma­ble 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)

♦ VINDirectly 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

87V

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

(VIN= +12V (for MAX5052, VINmust first be brought up to 23.6V for startup), 10nF bypass capacitors at VINand VCC, C

NDRV

= 0,

V

UVLO

= +1.4V, VFB= +1.0V, V

COMP

= floating, VCS= 0V, typical values are measured at TA= +25°C, TA= -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.

VINto GND .............................................................-0.3V to +30V

VCCto GND............................................................-0.3V to +13V

FB, COMP, UVLO, CS to GND .................................-0.3V to +6V

NDRV to GND.............................................-0.3V to (VCC+ 0.3V)

Continuous Power Dissipation (TA= +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

CONDITIONS

UNITS

UNDERVOLTAGE LOCKOUT/STARTUP

Bootstrap UVLO Wake-Up Level

V

SUVR

VIN rising (MAX5052 only)

V

Bootstrap UVLO Shutdown Level

V

SUVF

VIN falling (MAX5052 only)

V

UVLO/EN Wake-Up Threshold V

ULR2

UVLO/EN rising

V

UVLO/EN Shutdown Threshold V

ULF2

UVLO/EN falling

V

UVLO/EN Input Current I

UVLO

TJ = +125°C 25 nA

UVLO/EN Hysteresis 50 mV
VIN Supply Current In

Undervoltage Lockout

I

START

VIN = +19V, for MAX5052 only when in
bootstrap UVLO

45 90 µA

VIN Range V

IN

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

VIN steps up from +9V to +24V 5

Bootstrap UVLO Propagation
Delay

t

BUVF

VIN steps down from +24V to +9V 1

µs

INTERNAL SUPPLY

VCC Regulator Set Point V

CCSP

VIN = +10.8V to +24V, sinking 1µA to 20mA
from V

CC

7

V

VIN Supply Current After Startup I

IN

VIN = +24V 1.4 2.5 mA

Shutdown Supply Current UVLO/EN = low 90 µA

GATE DRIVER

)

Measured at NDRV sinking, 100mA 2 4

Driver Output Impedance

)

Measured at NDRV sourcing, 20mA 4 12

Ω

Driver Peak Sink Current 1A
Driver Peak Source Current

A

PWM COMPARATOR

Comparator Offset Voltage

V

COMP

- V

CS

V

CS Input Bias Current I

CS

VCS = 0V -2 +2 µA

Comparator Propagation Delay t

PWM

VCS = +0.1V 60 ns

Minimum On-Time

)

ns

SYMBOL

MIN TYP MAX

R

ON(LOW

R

ON(HIGH

VO

PWM

t

ON(MIN

19.68 21.6 23.60

9.05 9.74 10.43

1.188 1.28 1.371

1.168 1.23 1.291

10.8

0.65

1.15 1.38 1.70

150

10.5

MAX5052/MAX5053

Current-Mode PWM Controllers with an Error

Amplifier for Isolated/Nonisolated Power Supplies

_______________________________________________________________________________________ 3

Note 1: All devices are 100% tested at TA= +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)

(VIN= +12V (for MAX5052, VINmust first be brought up to 23.6V for startup), 10nF bypass capacitors at VINand VCC, C

NDRV

= 0,

V

UVLO

= +1.4V, VFB= +1.0V, V

COMP

= floating, VCS= 0V, typical values are measured at TA= +25°C, TA= -40°C to + 85°C, unless

otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CURRENT-LIMIT COMPARATOR

Current-Limit Trip Threshold V

CS

320 mV

CS Input Bias Current I

CS

VCS = 0V -2 +2 µA

Propagation Delay From
Comparator Input to NDRV

t

PWM

50mV overdrive 60 ns

Switching Frequency f

SW

290 kHz

MAX505_A 50

Maximum Duty Cycle D

MAX

MAX505_B 75 76

%

VIN CLAMP VOLTAGE

VIN Clamp Voltage V

INC

2mA sink current, MAX5052 only (Note 3)

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)

V
Input Bias Current 50 nA
COMP Short-Circuit Current 8mA

THERMAL SHUTDOWN

°C

Thermal Hysteresis 25 °C

DIGITAL SOFT-START

Soft-Start Duration

clock

cycles

Reference Voltage Steps During
Soft-Start

31

steps

Reference Voltage Step 40 mV

Thermal-Shutdown Temperature 130

262 291

230 262

24.1 26.1 29.0

1.218 1.230 1.242

15,872

50.5

MAX5052/MAX5053

Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies

4 _______________________________________________________________________________________

Typical Operating Characteristics

(UVLO = +1.4V, VFB= +1V, V

COMP

= floating, VCS= 0V, TA= +25°C, unless otherwise noted.)

BOOTSTRAP UVLO WAKE-UP LEVEL

vs. TEMPERATURE

MAX5052 toc01

TEMPERATURE (°C)

V

IN

(V)

6040200-20

21.35

21.40

21.45

21.50

21.55

21.60

21.30

-40 80

MAX5052 VIN RISING

BOOTSTRAP UVLO SHUTDOWN LEVEL

vs. TEMPERATURE

MAX5052 toc02

TEMPERATURE (°C)

V

IN

(V)

6040200-20

9.8

9.9

10.0

10.1

9.7

-40 80

MAX5052 VIN FALLING

UVLO/EN WAKE-UP THRESHOLD

vs. TEMPERATURE

MAX5052 toc03

TEMPERATURE (°C)

UVLO/EN (V)

6040200-20

1.255

1.260

1.265

1.270

1.275

1.280

1.250

-40 80

UVLO/EN RISING

UVLO/EN SHUTDOWN THRESHOLD

vs. TEMPERATURE

MAX5052 toc04

TEMPERATURE (°C)

UVLO/EN (V)

6040200-20

1.15

1.20

1.25

1.30

1.10

-40 80

UVLO/EN FALLING

VIN SUPPLY CURRENT IN UNDERVOLTAGE

LOCKOUT vs. TEMPERATURE

MAX5052 toc05

TEMPERATURE (°C)

I

START

(µA)

6040200-20

43

44

45

46

47

48

49

50

51

52

42

-40 80

VIN = 19V
MAX5052 WHEN IN BOOTSTRAP UVLO
MAX5053 WHEN UVLO/EN IS LOW

VIN SUPPLY CURRENT AFTER STARTUP

vs. TEMPERATURE

MAX5052 toc06

TEMPERATURE (°C)

I

IN

(mA)

6040200-20

1.2

1.3

1.4

1.5

1.1

-40 80

VIN = 24V

VCC REGULATOR SET POINT

vs. TEMPERATURE

MAX5052 toc07

TEMPERATURE (°C)

V

CC

(V)

6040200-20

9.3

9.5

9.4

9.7

9.6

9.8

9.2

-40 80

VIN = 19V
NO LOAD

NDRV OUTPUT IS NOT
SWITCHING, V

FB

= 1.5V

NDRV OUTPUT IS
SWITCHING

VCC REGULATOR SET POINT

vs. TEMPERATURE

MAX5052 toc08

TEMPERATURE (°C)

V

CC

(V)

6040200-20

8.2

8.5

8.6

8.4

8.3

8.8

8.7

8.9

8.1

-40 80

VIN = 10.8V

10mA LOAD

20mA LOAD

CURRENT-LIMIT TRIP THRESHOLD

vs. TEMPERATURE

MAX5052 toc09

TEMPERATURE (°C)

CURRENT-LIMIT TRIP THRESHOLD (mV)

6040200-20

275

290

295

285

280

305

300

310

270

-40 80

+3σ

-3σ

MEAN

TOTAL NUMBER OF
DEVICES = 100