Rainbow Electronics MAX5090C User Manual

General Description

The MAX5090A/B/C easy-to-use, high-efficiency, highvoltage step-down DC-DC converters operate from an input voltage up to 76V, and consume only 310µA quiescent current at no load. This pulse-width-modulated (PWM) converter operates at a fixed 127kHz switching frequency at heavy loads, and automatically switches to pulse-skipping mode to provide low quiescent current and high efficiency at light loads. The MAX5090 includes internal frequency compensation simplifying circuit implementation. The device can also be synchronized with external system clock frequency in a noise-sensitive application. The MAX5090 uses an internal low on-resistance and a 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 overtemperature shutdown.

The MAX5090 delivers up to 2A output current. External shutdown is included, featuring 19µA (typ) shutdown current. The MAX5090A/MAX5090B versions have fixed output voltages of 3.3V and 5V, respectively, while the MAX5090C features an adjustable 1.265V to 11V output voltage.

The MAX5090 is available in a space-saving 16-pin thin QFN package (5mm x 5mm) and operates over the automotive temperature range (-40°C to +125°C).

Applications

Automotive

Industrial

Distributed Power

Features

♦ Wide Input Voltage Range: 6.5V to 76V

♦ Fixed (3.3V, 5V) and Adjustable (1.265V to 11V)

Output-Voltage Versions

♦ 2A Output Current

♦ Efficiency Up to 92% ♦ Internal 0.26Ω High-Side DMOS FET

♦ 310µA Quiescent Current at No Load

♦ 19µA Shutdown Current

♦ Internal Frequency Compensation

♦ Fixed 127kHz Switching Frequency

♦ External Frequency Synchronization

♦ Thermal Shutdown and Short-Circuit Current Limit

♦ -40°C to +125°C Automotive Temperature Range

♦ 16-Pin (5mm x 5mm) Thin QFN Package

♦ Capable of Dissipating 2.67W at +70°C

MAX5090A/B/C

2A, 76V, High-Efficiency MAXPower Step-Down

DC-DC Converters

________________________________________________________________ Maxim Integrated Products 1

15

16

14

13

6

5

7

LX

V

IN

8

LX

N.C.

ON/OFF

PGND

12

DRAIN

4

12EP11 9

N.C.

FB

SS

SYNC

VD

MA5090

BST SGND

3

10

DRAIN

TQFN

TOP VIEW

Pin Configuration

PGND

BST

LX

V

IN

SGND

FB

V

OUT

5V/2A

VD

100µH

C

BST

0.22µF

3.3µF

ON/OFF

C

OUT

100µF

SS

SYNC

D1 PDS5100H

DRAIN

C

SS

0.047µF

C

IN

68µF

C

BYPASS

0.47µF

R

IN

10Ω

V

IN

7.5V TO 76V

MAX5090B

Typical Operating Circuit

19-3872; Rev 0; 3/06

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.

PART

TEMP

RANGE

PINPACKAGE*

OUTPUT

VOLTAGE

(V)

MAX5090AATE+

3.3

MAX5090AATE

3.3

MAX5090BATE+

5.0

MAX5090BATE

5.0

Ordering Information

Ordering Information continued at end of data sheet.

*The package code is T1655-3. **EP = Exposed pad. +Denotes lead-free package.

-40°C to +125°C 16 TQFN-EP**

MAX5090A/B/C

2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under "Absolute Maximum Ratings" may cause 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 PGND, unless otherwise specified.) V

IN

, DRAIN .............................................................-0.3V to +80V

SGND, PGND.………………………………………-0.3V to +0.3V

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

IN

+ 0.3V)

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

IN

+ 10V)

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

ON/

OFF........................................................-0.3V to (VIN+ 0.3V)

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

SS…………………………………………………………-0.3 to +4V FB

MAX5090A/MAX5090B…………….……… ...….-0.3V to +15V

MAX5090C ................1mA (internally clamped to +2V, -0.3V)

V

OUT

Short-Circuit Duration………………………… ...Continuous

VD Short-Circuit Duration………….............................Continuous

Continuous Power Dissipation (TA= +70°C)*

16-Pin TQFN (derate 33.3mW/°C above +70°C) ........2.667W

Operating Junction Temperature Range...........-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

(VIN= +12V, V

ON/OFF

= +12V, V

SYNC

= 0V, I

OUT

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

T

A

= +25°C. See the Typical Operating Circuit.) (Note 1)

*As per JEDEC 51 Standard Multilayer Board.

PARAMETER

CONDITIONS

UNITS

Input Voltage Range V

IN

6.5

V

Undervoltage Lockout UVLO VIN rising

V

UVLO Hysteresis

0.5 V

VIN = 6.5V to 76V, I

OUT

= 0 to 2A

3.3

VIN = 7.5V to 76V, I

OUT

= 0 to 2A

5.0

Output Voltage V

OUT

VIN = 7V to 76V, I

OUT

= 0 to 1A

5.0

V

Output Voltage Range V

OUT

MAX5090C only

V

Feedback Voltage V

FB

MAX5090C, VIN = 6.5V to 76V

V

VIN = 12V, I

OUT

= 1A 80

VIN = 12V, I

OUT

= 1A 88Efficiency η

VIN = 12V, V

OUT

= 5V, I

OUT

= 1A 88

%

VIN = 6.5V to 28V 310

VIN = 7V to 28V 310

Quiescent Supply Current

(Note 2)

I

Q

VIN = 6.5V to 28V 310

µA

VIN = 6.5V to 40V 310

VIN = 7V to 40V 310

Quiescent Supply Current

(Note 2)

I

Q

VIN = 6.5V to 40V 310

µA

VIN = 6.5V to 76V 310

VIN = 7V to 76V 310

Quiescent Supply Current (Note 2)

I

Q

VIN = 6.5V to 76V 310

µA

Shutdown Current I

SHDN

V

ON/OFF

= 0V, VIN = 14V 19 45 µA

SOFT-START

Default Internal Soft-Start Period

C

SS

= 0 700 µs

Soft-Start Charge Current

I

SS

4.5 10

µA

SYMBOL

UVLO

HYS

MIN TYP MAX

5.70 6.17 6.45

MAX5090A

MAX5090B

MAX5090A

MAX5090B

MAX5090C

MAX5090A

MAX5090B

MAX5090C

MAX5090A

MAX5090B

MAX5090C

MAX5090A

MAX5090B

MAX5090C

3.20

4.85

1.265 11.000

1.191 1.228 1.265

76.0

3.39

5.15

550

570

650

16.0

MAX5090A/B/C

2A, 76V, High-Efficiency MAXPower Step-Down

DC-DC Converters

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= +12V, V

ON/OFF

= +12V, V

SYNC

= 0V, I

OUT

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

T

A

= +25°C. See the Typical Operating Circuit.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Soft-Start Reference Voltage

)

V

INTERNAL SWITCH/CURRENT LIMIT

Peak Switch Current Limit I

LIM

(Note 3) 2.4 3.3 5.0 A

Switch Leakage Current I

OL

VIN = 76V, V

ON/OFF

= 0V, VLX = 0V -10

µA

Switch On-Resistance

)

I

SWITCH

= 1A

0.4 Ω

PFM Threshold I

PFM

Minimum switch current in any cycle 1 60

mA

PFM Threshold I

PFM

Minimum switch current in any cycle at TJ ≤ +25°C (Note 4)

14

mA

FB Input Bias Current I

B

MAX5090C, VFB = 1.2V

nA

ON/OFF CONTROL INPUT

ON/OFF Input-Voltage Threshold

Rising trip point

V

ON/OFF Input-Voltage Hysteresis

V

HYST

100 mV

ON/OFF Input Current

V

ON/OFF

= 0V to V

IN

10

nA

OSCILLATOR/SYNCHRONIZATION

Oscillator Frequency f

0SC

106

kHz

Synchronization f

SYNC

kHz

Maximum Duty Cycle D

MAX

VIN = 6.5V to 76V, V

OUT

≤ 11V 80 95 %

SYNC High-Level Voltage 2.0 V

SYNC Low-Level Voltage 0.8 V

SYNC Minimum Pulse Width

ns

SYNC Input Leakage -1 +1 µA

INTERNAL VOLTAGE REGULATOR

Regulator Output Voltage VD VIN = 9V to 76V, I

OUT

= 0 7.0 7.8 8.4 V

Dropout Voltage 6.5V ≤ VIN ≤ 8.5V, I

OUT

= 15mA 0.5 V

Load Regulation

0 to 15mA 10 Ω

PACKAGE THERMAL CHARACTERISTICS

Thermal Resistance (Junction to Ambient)

θ

JA

TQFN package (JEDEC 51) 30

°C/W

THERMAL SHUTDOWN

Thermal-Shutdown Junction Temperature

T

SH

Temperature rising

°C

Thermal-Shutdown Hysteresis

T

HYST

20 °C

Note 1: All limits at -40°C are guaranteed by design, not production tested. Note 2: For total current consumption during switching (at no load), also see the Typical Operating Characteristics. Note 3: Switch current at which the current-limit circuit is activated. Note 4: Limits are guaranteed by design.

V

SS(REF

R

DS(ON

V

ON/OFF

I

ON/OFF

∆VD/∆I

VD

1.23 1.46 1.65

0.26

-150 +0.1 +150

1.180 1.38 1.546

127 150

119 200

+175

+10

300

100

350

MAX5090A/B/C

2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VIN= 12V, V

ON/OFF

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

Operating Circuit, if applicable.)

3.20

3.24

3.22

3.28

3.26

3.32

3.30

3.34

3.38

3.36

3.40

-50 0 25-25 50 75 100 125 150

V

OUT

vs. TEMPERATURE

(MAX5090AATE, V

OUT

= 3.3V)

MAX5090 toc01

AMBIENT TEMPERATURE (°C)

V

OUT

(V)

I

OUT

= 0

I

OUT

= 2A

4.85

4.90

4.95

5.00

5.05

5.10

5.15

-50 0-25 25 50 75 100 125 150

V

OUT

vs. TEMPERATURE

(MAX5090BATE, V

OUT

= 5V)

MAX5090 toc02

AMBIENT TEMPERATURE (°C)

V

OUT

(V)

I

OUT

= 0

I

OUT

= 2

3.20

3.26

3.24

3.22

3.30

3.28

3.38

3.36

3.34

3.32

3.40

6.5 16 26 36 46 56 66 76

LINE REGULATION

(MAX5090AATE, V

OUT

= 3.3V)

MAX5090 toc03

VIN (V)

V

OUT

(V)

I

OUT

= 0

I

OUT

= 2A

4.85

4.95

4.90

5.05

5.00

5.10

5.15

6.5 36 4616 26 56 66 76

LINE REGULATION

(MAX5090BATE, V

OUT

= 5V)

MAX5090 toc04

VIN (V)

V

OUT

(V)

I

OUT

= 0

I

OUT

= 2A

I

LOAD

(mA)

V

OUT

(V)

LOAD REGULATION

(MAX5090AATE, V

OUT

= 3.3V)

3.38

3.40

3.32

3.34

3.36

0.1 1 10

100 1000 10,000

MAX5090 toc05

3.28

3.30

3.22

3.24

3.26

3.20

VIN = 76V

VIN = 24V

VIN = 6.5V

I

LOAD

(mA)

V

OUT

(V)

LOAD REGULATION

(MAX5090BATE, V

OUT

= 5V)

5.15

5.10

5.05

5.00

MAX5090 toc06

4.95

4.90

4.85

0.1 1 10

100 1000 10,000

VIN = 24V

VIN = 76V

VIN = 6.5V

0

30

20

10

40

50

60

70

80

90

100

0 800400 1200 1600 2000

EFFICIENCY vs. LOAD CURRENT

(MAX5090AATE, V

OUT

= 3.3V)

MAX5090 toc07

LOAD CURRENT (mA)

EFFICIENCY (%)

VIN = 76V

VIN = 48V

VIN = 24V

VIN = 12V

VIN = 6.5V

0

30

20

10

40

50

60

70

80

90

100

0 800400 1200 1600 2000

EFFICIENCY vs. LOAD CURRENT

(MAX5090BATE, V

OUT

= 5V)

MAX5090 toc08

LOAD CURRENT (mA)

EFFICIENCY (%)

VIN = 6.5V

VIN = 76V

VIN = 48V

VIN = 24V

VIN = 12V

1.0

1.5

2.0

2.5

3.0

3.5

4.0

-50 0-25 25 50 75 100 125 150

OUTPUT CURRENT LIMIT vs. TEMPERATURE

(MAX5090AATE)

MAX5090 toc09

AMBIENT TEMPERATURE (°C)

OUTPUT CURRENT LIMIT (A)

V

OUT

= 3.3V

5% DROP IN V

OUT

PULSED OUTPUT LOAD

MAX5090A/B/C

2A, 76V, High-Efficiency MAXPower Step-Down

DC-DC Converters

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VIN= 12V, V

ON/OFF

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

Operating Circuit, if applicable.)

1.0

1.5

2.0

2.5

3.0

3.5

4.0

-50 0-25 25 50 75 100 125 150

OUTPUT CURRENT LIMIT vs. TEMPERATURE

(MAX5090BATE)

MAX5090 toc010

AMBIENT TEMPERATURE (°C)

OUTPUT CURRENT LIMIT (A)

V

OUT

= 5V

5% DROP IN V

OUT

PULSED OUTPUT LOAD

1.0

3.0

2.0

5.0

4.0

6.0

7.0

6.5 36 4616 26 56 66 76

OUTPUT CURRENT LIMIT vs. INPUT VOLTAGE

(MAX5090AATE)

MAX5090 toc11

INPUT VOLTAGE (V)

OUTPUT CURRENT LIMIT (A)

V

OUT

= 3.3V

5% DROP IN V

OUT

PULSED OUTPUT LOAD

1.0

3.0

2.0

5.0

4.0

6.0

7.0

6.5 36 4616 26 56 66 76

OUTPUT CURRENT LIMIT vs. INPUT VOLTAGE

(MAX5090BATE)

MAX5090 toc12

INPUT VOLTAGE (V)

OUTPUT CURRENT LIMIT (A)

V

OUT

= 5V

5% DROP IN V

OUT

PULSED OUTPUT LOAD

300

350

400

450

500

550

600

-50 0-25 25 50 75 100 125 150

NO-LOAD SUPPLY CURRENT vs. TEMPERATURE

(MAX5090AATE)

MAX5090 toc13

AMBIENT TEMPERATURE (°C)

NO-LOAD SUPPLY CURRENT (µA)

V

OUT

= 3.3V

300

400

350

500

450

550

600

6.5 36 4616 26 56 66 76

NO-LOAD SUPPLY CURRENT vs. INPUT VOLTAGE

(MAX5090AATE)

MAX5090 toc14

INPUT VOLTAGE (V)

NO-LOAD SUPPLY CURRENT

V

OUT

= 3.3V

10

14

22

18

26

30

-50 0 25-25 50 100 125 150 175

SHUTDOWN CURRENT vs. TEMPERATURE

(MAX5090AATE)

MAX5090 toc15

AMBIENT TEMPERATURE (°C)

SHUTDOWN CURRENT (µA)

V

OUT

= 3.3V

0

10

5

25

20

15

40

35

30

45

6.5 36 4616 26 56 66 76

SHUTDOWN CURRENT

vs. INPUT VOLTAGE

MAX5090 toc16

INPUT VOLTAGE (V)

SHUTDOWN CURRENT (µA)

V

OUT

= 3.3V

0

3

6

9

11

13

59107861111.5 12 12.5 13

OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX5090 toc17

VIN (V)

V

OUT

(V)

I

OUT

= 0A

I

OUT

= 1A

I

OUT

= 2A

MAX5090CATE V

OUT

= 11V

V

ON/OFF

= V

IN

MAX5090 toc18

LOAD-TRANSIENT RESPONSE

(MAX5090AATE)

V

OUT

= 3.3V

A: V

OUT

, 200mV/div, AC-COUPLED

B: I

OUT

, 1A/div, 1A TO 2A

400µs/div

A

B

MAX5090A/B/C

2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VIN= 12V, V

ON/OFF

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

Operating Circuit, if applicable.)

MAX5090 toc19

LOAD-TRANSIENT RESPONSE

(MAX5090AATE)

V

OUT

= 3.3V

A: V

OUT

, 200mV/div, AC-COUPLED

B: I

OUT

, 500mA/div, 0.1A TO 1A

400µs/div

A

B

LX WAVEFORMS (MAX5090AATE)

MAX5090 toc20

V

OUT

= 3.3V

A

B

A: SWITCH VOLTAGE (LX PIN), 20mV/div (V

IN

= 48V)

B: INDUCTOR CURRENT, 2A/div (I

0

= 2A)

4µs/div

0

MAX5090 toc21

LX WAVEFORMS (MAX5090AATE)

V

OUT

= 3.3V

A: SWITCH VOLTAGE, 20V/div (V

IN

= 48V)

B: INDUCTOR CURRENT, 200mA/div (I

0

= 75mA)

4µs/div

A

B

MAX5090 toc22

LX WAVEFORM

(MAX5090AATE)

V

OUT

= 3.3V

A: SWITCH VOLTAGE, 20V/div (V

IN

= 48V)

B: INDUCTOR CURRENT, 200mA/div (I

OUT

= 0)

4µs/div

A

B

MAX5090 toc23

STARTUP WAVEFORM

(I

OUT

= 0)

A: V

ON/OFF

, 2V/div

B: V

OUT

, 1V/div

4ms/div

A

B

C

SS

= 0.047µF

MAX5090 toc24

STARTUP WAVEFORM

(I

OUT

= 2A)

A: V

ON/OFF

, 2V/div

B: V

OUT

, 1V/div

4ms/div

A

B

C

SS

= 0.047µF

1.0

3.0

2.0

5.0

4.0

6.0

7.0

6.5 36 4616 26 56 66 76

PEAK SWITCH CURRENT

vs. INPUT VOLTAGE

MAX5090 toc25

INPUT VOLTAGE (V)

PEAK SWITCH CURRENT (A)

MAX5090AATE V

OUT

= 3.3V

5% DROP IN V

OUT

PULSED OUTPUT LOAD

MAX5090 toc26

SYNCHRONIZATION

f

SYNC

= 119kHz

SYNC 2V/div

LX 10V/div

2µs/div

MAX5090 toc27

f

SYNC

= 200kHz

SYNCHRONIZATION

1µs/div

SYNC 2V/div

LX 10V/div