MAXIM MAX5033 User Manual

现货库存、技术资料、百科信息、热点资讯，精彩尽在鼎好!

General Description

The MAX5033 easy-to-use, high-efficiency, high-voltage,
step-down DC-DC converter operates from an input volt­age up to 76V and consumes only 270µA quiescent cur­rent at no load. This pulse-width modulated (PWM)
converter operates at a fixed 125kHz switching frequen­cy at heavy loads, and automatically switches to pulse­skipping mode to provide low quiescent current and
high efficiency at light loads. The MAX5033 includes
internal frequency compensation simplifying circuit
implementation. The device uses an internal low-on­resistance, high-voltage, DMOS transistor to obtain high
efficiency and reduce overall system cost. This device
includes undervoltage lockout, cycle-by-cycle current
limit, hiccup-mode output short-circuit protection, and
thermal shutdown.

The MAX5033 delivers up to 500mA output current.
The output current may be limited by the maximum
power dissipation capability of the package. External
shutdown is included, featuring 10µA (typ) shutdown
current. The MAX5033A/B/C versions have fixed output
voltages of 3.3V, 5V, and 12V, respectively, while the
MAX5033D features an adjustable output voltage, from

1.25V to 13.2V.

The MAX5033 is available in space-saving 8-pin SO
and 8-pin plastic DIP packages and operates over the
automotive (-40°C to +125°C) temperature range.

Applications

Automotive

Consumer Electronics

Industrial

Distributed Power

Features

♦ Wide 7.5V to 76V Input Voltage Range
♦ Fixed (3.3V, 5V, 12V) and Adjustable (1.25V to

13.2V) Voltage Versions

♦ 500mA Output Current
♦ Efficiency Up to 94%
♦ Internal 0.4Ω High-Side DMOS FET
♦ 270µA Quiescent Current at No Load, 10µA

Shutdown Current

♦ Internal Frequency Compensation
♦ Fixed 125kHz Switching Frequency
♦ Thermal Shutdown and Short-Circuit Current Limit
♦ 8-Pin SO and PDIP Packages

MAX5033

500mA, 76V, High-Efficiency, MAXPower

Step-Down DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2979; Rev 2; 5/04

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.

Pin Configuration

MAX5033

GND

BST

LX

V

IN

SGND

FB

D1
50SQ100

VD

220µH

V

OUT

5V, 0.5A

V

IN

7.5V TO 76V

47µF

0.1µF

0.1µF

33µF

ON

OFF

R1

R2

ON/OFF

Typical Operating Circuit

PART TEMP RANGE

MAX5033AUSA 0°C to +85°C 8 SO
MAX5033AUPA 0°C to +85°C 8 PDIP
MAX5033AASA -40°C to +125°C 8 SO
MAX5033BUSA 0°C to +85°C 8 SO
MAX5033BUPA 0°C to +85°C 8 PDIP
MAX5033BASA -40°C to +125°C 8 SO
MAX5033CUSA 0°C to +85°C 8 SO
MAX5033CUPA 0°C to +85°C 8 PDIP
MAX5033CASA -40°C to +125°C 8 SO
MAX5033DUSA 0°C to +85°C 8 SO
MAX5033DUPA 0°C to +85°C 8 PDIP
MAX5033DASA -40°C to +125°C 8 SO

PIN­PACKAGE

OUTPUT

VOLTAGE

(V)

3.3

5.0

12

ADJ

1

BST

VD

2

SGND

3

FB

4

MAX5033

SO/PDIP

8

7

6

5

LX

V

IN

GND

ON/OFF

MAX5033

500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

(Voltages referenced to GND, unless otherwise specified.)
V

IN

.........................................................................-0.3V to +80V

SGND ....................................................................-0.3V to +0.3V

LX.................................................................-0.8V to (V

IN

+ 0.3V)

BST ...............................................................-0.3V to (V

IN

+ 10V)

BST (transient < 100ns)................................-0.3V to (V

IN

+ 15V)

BST to LX................................................................-0.3V to +10V

BST to LX (transient < 100ns) ................................-0.3V to +15V

ON/OFF........................................................-0.3V to (V

IN

+ 0.3V)

VD...........................................................................-0.3V to +12V

FB

MAX5033A/MAX5033B/MAX5033C ...................-0.3V to +15V

MAX5033D .........................................................-0.3V to +12V

V

OUT

Short-Circuit Duration...........................................Indefinite

VD Short-Circuit Duration ..............................................Indefinite

Continuous Power Dissipation (T

A

= +70°C)

8-Pin PDIP (derate 9.1mW/°C above +70°C)...............727mW

8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW

Operating Temperature Range

MAX5033_U_ _ ...................................................0°C to +85°C

MAX5033_A_ _ ..............................................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS (MAX5033_U_ _)

(VIN= +12V, V

ON/OFF

= +12V, I

OUT

= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the

Typical Application Circuit.)

Input Voltage Range V

Undervoltage Lockout UVLO 5.2 V

Output Voltage V

Feedback Voltage V

Quiescent Supply Current I

Shutdown Current I

Peak Switch Current Limit I

Switch Leakage Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX5033A 7.5 76.0

MAX5033B 7.5 76.0

IN

MAX5033C 15 76

MAX5033D 7.5 76.0

MAX5033A, VIN = 7.5V to 76V,
I

= 20mA to 500mA

OUT

OUT

SHDN

LIM

OL

MAX5033B, VIN = 7.5V to 76V,
I

= 20mA to 500mA

OUT

MAX5033C, VIN = 15V to 76V,
I

= 20mA to 500mA

OUT

VIN = 7.5V to 76V, MAX5033D 1.192 1.221 1.250 V

FB

VIN = 12V, I

VIN = 12V, I

VIN = 24V, I

V

= 12V, V

IN

MAX5033D

VFB = 3.5V, VIN = 7.5V to 76V, MAX5033A 270 440

VFB = 5.5V, VIN = 7.5V to 76V, MAX5033B 270 440

Q

VFB = 13V, VIN = 15V to 76V, MAX5033C 270 440

VFB = 1.3V, MAX5033D 270 440

V

(Note 1) 0.95 1.5 2.1 A

VIN = 76V, V

= 0V, VIN = 7.5V to 76V 10 45 µA

ON/OFF

= 500mA, MAX5033A 86

LOAD

= 500mA, MAX5033B 90

LOAD

= 500mA, MAX5033C 94Efficiency η

LOAD

= 5V, I

OUT

ON/OFF

= 500mA,

LOAD

= 0V, VLX = 0V 1 µA

3.185 3.3 3.415

4.85 5.0 5.15

11.64 12 12.36

90

V

V

%

µA

MAX5033

500mA, 76V, High-Efficiency, MAXPower

Step-Down DC-DC Converter

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (MAX5033_U_ _) (continued)

(VIN= +12V, V

ON/OFF

= +12V, I

OUT

= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the

Typical Application Circuit.)

)

ELECTRICAL CHARACTERISTICS (MAX5033_A_ _)

(VIN= +12V, V

ON/ OFF

= +12V, I

OUT

= 0, TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See

the Typical Application Circuit.) (Note 2)

Switch On-Resistance R

PFM Threshold I

FB Input Bias Current I

ON/OFF CONTROL INPUT

ON/OFF Input-Voltage Threshold V
ON/OFF Input-Voltage Hysteresis V
ON/OFF Input Current I

OSCILLATOR

Oscillator Frequency f

Maximum Duty Cycle D

VOLTAGE REGULATOR

Regulator Output Voltage VD VIN = 8.5V to 76V, IL = 0mA 6.9 7.8 8.8 V
Dropout Voltage 7.5V ≤ VIN ≤ 8.5V, IL = 1mA 2.0 V
Load Regulation ∆VD/∆IVD0 to 5mA 150 Ω

PACKAGE THERMAL CHARACTERISTICS

Thermal Resistance
(Junction to Ambient)

THERMAL SHUTDOWN

Thermal-Shutdown Junction
Temperature

Thermal-Shutdown Hysteresis T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

I

DS(ON

PFM

B

ON/OFF

HYST

ON/OFFVON/OFF

OSC

MAX

θ

JA

T

SH

HYST

= 500mA 0.4 0.80 Ω

SWITCH

Minimum switch current in any cycle 35 65 95 mA

MAX5033D -150 +0.01 +150 nA

Rising trip point 1.53 1.69 1.85 V

100 mV

= 0V to V

MAX5033D 95 %

SO package (JEDEC 51) 170

DIP package (JEDEC 51) 110

IN

109 125 135 kHz

10 150 nA

+160 °C

20 °C

°C/W

Input Voltage Range V

Undervoltage Lockout UVLO 5.2 V

Output Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX5033A 7.5 76.0

MAX5033B 7.5 76.0

IN

MAX5033C 15 76

MAX5033D 7.5 76.0

OUT

MAX5033A, VIN = 7.5V to 76V,
I

= 20mA to 500mA

OUT

MAX5033B, VIN = 7.5V to 76V,
I

= 20mA to 500mA

OUT

MAX5033C, VIN = 15V to 76V,
I

= 20mA to 500mA

OUT

3.185 3.3 3.415

4.825 5.0 5.175

11.58 12 12.42

V

V

MAX5033

500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (MAX5033_A_ _)

(VIN= +12V, V

ON/ OFF

= +12V, I

OUT

= 0, TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See

the Typical Application Circuit.) (Note 2)

)

Note 1: Switch current at which the current limit is activated.
Note 2: All limits at -40°C are guaranteed by design, not production tested.

Feedback Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Quiescent Supply Current I

Shutdown Current I

Peak Switch Current Limit I

Switch Leakage Current I

Switch On-Resistance R

PFM Threshold I

FB Input Bias Current I

ON/OFF CONTROL INPUT

ON/OFF Input-Voltage Threshold V
ON/OFF Input-Voltage Hysteresis V
ON/OFF Input Current I

OSCILLATOR

Oscillator Frequency f

Maximum Duty Cycle D

VOLTAGE REGULATOR

Regulator Output Voltage VD VIN = 8.5V to 76V, IL = 0mA 6.5 7.8 9.0 V
Dropout Voltage 7.5V ≤ VIN ≤ 8.5V, IL = 1mA 2.0 V
Load Regulation ∆VD/∆IVD0 to 5mA 150 Ω

PACKAGE THERMAL CHARACTERISTICS

Thermal Resistance
(Junction to Ambient)

THERMAL SHUTDOWN

Thermal-Shutdown Junction
Temperature

Thermal-Shutdown Hysteresis T

VIN = 7.5V to 76V, MAX5033D 1.192 1.221 1.250 V

FB

VIN = 12V, I

VIN = 12V, I

VIN = 24V, I

V

= 12V, V

IN

MAX5033D

VFB = 3.5V, VIN = 7.5V to 76V, MAX5033A 270 440

VFB = 5.5V, VIN = 7.5V to 76V, MAX5033B 270 440

Q

VFB = 13V, VIN = 15V to 76V, MAX5033C 270 440

VFB = 1.3V, MAX5033D 270 440

SHDN

LIM

OL

DS(ON

PFM

ON/OFF

HYST

ON/OFFVON/OFF

OSC

MAX

θ

T

HYST

V

ON/OFF

(Note 1) 0.95 1.5 2.20 A

VIN = 76V, V

I

SWITCH

Minimum switch current in any cycle 35 65 110 mA

MAX5033D -150 +0.01 +150 nA

B

Rising trip point 1.50 1.69 1.85 V

MAX5033D 95 %

SO package (JEDEC 51) 170

JA

DIP package (JEDEC 51) 110

SH

= 0V, VIN = 7.5V to 76V 10 45 µA

= 500mA 0.4 0.80 Ω

= 0V to V

= 500mA, MAX5033A 86

LOAD

= 500mA, MAX5033B 90

LOAD

= 500mA, MAX5033C 94Efficiency η

LOAD

= 5V, I

OUT

= 0V, VLX = 0V 1 µA

ON/OFF

IN

LOAD

= 500mA,

90

100 mV

10 150 nA

105 125 137 kHz

+160 °C

20 °C

%

µA

°C/W

MAX5033

500mA, 76V, High-Efficiency, MAXPower

Step-Down DC-DC Converter

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VIN= 12V, V

ON/OFF

= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical

Application Circuit, if applicable.)

V

OUT

vs. TEMPERATURE

(MAX5033CASA, V

OUT

= 12V)

MAX5033 toc01

TEMPERATURE (°C)

V

OUT

(V)

11.9

12.0

12.1

12.2

12.3

12.4

11.8
100

50

0

-50

150

-25

25

75

125

I

OUT

= 0.1A

I

OUT

= 0.5A

V

OUT

vs. TEMPERATURE

(MAX5033BASA, V

OUT

= 5V)

MAX5033 toc02

TEMPERATURE (°C)

V

OUT

(V)

4.95

5.00

5.05

5.10

4.90

I

OUT

= 0.1A

I

OUT

= 0.5A

100

500

-50

150

-25

25

75

125

LINE REGULATION

(MAX5033CASA, V

OUT

= 12V)

MAX5033 toc03

INPUT VOLTAGE (V)

V

OUT

(V)

50 60 70403020

11.9

12.0

12.1

12.2

12.3

12.4

11.8

10 80

I

OUT

= 0A

I

OUT

= 0.5A

LINE REGULATION

(MAX5033BASA, V

OUT

= 5V)

MAX5033 toc04

INPUT VOLTAGE (V)

V

OUT

(V)

46 56 66362616

4.95

5.00

5.05

5.10

4.90

676

I

OUT

= 0A

I

OUT

= 0.5A

LOAD REGULATION

(MAX5033CASA, V

OUT

= 12V)

MAX5033 toc05

I

LOAD

(mA)

V

OUT

(V)

400300200100

11.9

12.0

12.1

12.2

12.3

12.4

11.8

0 500

VIN = 24V

VIN = 76V

LOAD REGULATION

(MAX5033BASA, V

OUT

= 5V)

MAX5033 toc06

I

LOAD

(mA)

V

OUT

(V)

400300200100

4.95

5.00

5.05

5.10

4.90

0500

VIN = 7.5V, 24V

VIN = 76V

EFFICIENCY vs. LOAD CURRENT

(MAX5033BASA, V

OUT

= 5V)

MAX5033 toc07

LOAD CURRENT (mA)

EFFICIENCY (%)

400300200100

30

50

40

20

10

70

60

100

90

80

0

0500

VIN = 7.5V

VIN = 12V

VIN = 24V

VIN = 48V

VIN = 76V

EFFICIENCY vs. LOAD CURRENT

(MAX5033CASA, V

OUT

= 12V)

MAX5033 toc08

LOAD CURRENT (mA)

EFFICIENCY (%)

400300200100

30

50

40

20

10

70

60

100

90

80

0

0 500

VIN = 15V

VIN = 24V

VIN = 48V

VIN = 76V

OUTPUT CURRENT LIMIT

vs. TEMPERATURE

MAX5033 toc09

TEMPERATURE (°C)

OUTPUT CURRENT LIMIT (A)

0.8

1.1

1.4

1.7

2.0

0.5

MAX5033BASA
5% DROP IN V

OUT

100

50

0-50

150

-25

25

75

125

MAX5033

500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VIN= 12V, V

ON/OFF

= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical

Application Circuit, if applicable.)

OUTPUT CURRENT LIMIT

vs. INPUT VOLTAGE

MAX5033 toc10

INPUT VOLTAGE (V)

OUTPUT CURRENT LIMIT (A)

665646362616

0.8

1.1

1.4

1.7

2.0

0.5
676

MAX5033BASA
V

OUT

= 5V

5% DROP IN V

OUT

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

MAX5033 toc11

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (µA)

240

280

320

360

400

200

100

50

0-50

150

-25

25

75

125

QUIESCENT SUPPLY CURRENT

vs. INPUT VOLTAGE

MAX5033 toc12

INPUT VOLTAGE (V)

QUIESCENT SUPPLY CURRENT (µA)

230

260

290

320

350

200

66

46

266

16

36

56

76

SHUTDOWN CURRENT

vs. TEMPERATURE

MAX5033 toc13

TEMPERATURE (°C)

SHUTDOWN CURRENT (µA)

5

10

15

20

25

0

100

50

0-50

150

-25

25

75

125

SHUTDOWN CURRENT

vs. INPUT VOLTAGE

MAX5033 toc14

INPUT VOLTAGE (V)

SHUTDOWN CURRENT (µA)

5

10

15

20

25

0

66

46

266

16

36

56

76

OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX5033 toc15

VIN (V)

V

OUT

(V)

12963

3

6

9

12

15

0

015

MAX5033CASA
V

OUT

= 12V

V

ON/OFF

= V

IN

I

OUT

= 0.3A

I

OUT

= 0.5A

MAX5033BASA

LOAD-TRANSIENT RESPONSE

MAX5033 toc16

400µs/div

B

A

A: V

OUT

, 200mV/div, AC-COUPLED

B: I

OUT

, 500mA/div, 100mA TO 500mA

V

OUT

= 5V

MAX5033BASA

LOAD-TRANSIENT RESPONSE

MAX5033 toc17

400µs/div

B

A

A: V

OUT

, 100mV/div, AC-COUPLED

B: I

OUT

, 200mA/div, 100mA TO 250mA

V

OUT

= 5V

MAX5033BASA

LOAD-TRANSIENT RESPONSE

MAX5033 toc18

400µs/div

B

A

A: V

OUT

, 100mV/div, AC-COUPLED

B: I

OUT

, 500mA/div, 250mA TO 500mA

V

OUT

= 5V