MAXIM MAX5058, MAX5059 User Manual

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General Description

The MAX5058/MAX5059 enable secondary-side synchronous rectification in isolated power supplies using widely available power MOSFETs. These devices facilitate the commutation of the secondary-side MOSFETs by providing a clean gate-drive signal that is synchronized to the power MOSFET switching in the primary side of the isolation transformer. The MAX5058/MAX5059 complement the MAX5051 and MAX5042/MAX5043 primaryside PWM ICs and enable the design of high-efficiency synchronously rectified isolated power supplies. Simultaneous conduction of the primary side and the freewheeling synchronous rectifier MOSFET is avoided by having a look-ahead signal (before the primary-side MOSFETs turn ON), thus eliminating large current spikes resulting from a shorted transformer secondary.

An on-board error amplifier with a versatile current reference output enables virtually unlimited possibilities in reference-voltage generation. Reference voltage for the error amplifier is generated by connecting an appropriate resistor to this output.

Low on-resistance margining MOSFETs integrated onchip allow for implementation of a margining circuit without the use of external switches. The MAX5058 provides a 5V LDO output for logic-level MOSFETs while the MAX5059 provides a 10V LDO output for conventional 10V MOSFETs.

The MAX5058/MAX5059 are designed to enable paralleling of multiple power supplies for accurate current sharing using a simple 2-wire, differential, current-share bus. Parallelability enables expansion of the power capabilities and simplifies thermal management in highoutput-current applications. When used in conjunction with the MAX5051, the primaries can also be synchronized and operated 180 degrees out of phase.

The MAX5058/MAX5059 are available in a 28-pin thermally enhanced TSSOP package and operate over a wide -40°C to +125°C temperature range.

Warning: The MAX5058/MAX5059 are designed to work in circuits that contain high voltages. Exercise caution.

Applications

Isolated Telecom Power Supplies

Isolated Networking Power Supplies ±48V Power-Supply Modules

Industrial Power Supplies ±48V/±12V Server Power Supplies

Features

♦ Clean Drive Waveforms for Synchronous

MOSFETs

♦ Utilization of a Look-Ahead Signal from the

Primary for Proper Turn-On/Turn-Off Times

♦ Synchronous Rectifier Drivers Capable of

Sourcing and Sinking Up to 2A Peak Current

♦ Internal Gate-Voltage Regulator for 5V (MAX5058)

or 10V (MAX5059) Gate-Drive Voltage

♦ Internal Error Amplifier

♦ Accurate Differential Current-Share/Force Circuit

Allows Paralleling of Several Power Supplies for High Output Current

♦ Internal Remote Voltage-Sense Amplifier

♦ Flexible Reference-Voltage Generation

♦ Output Voltage Regulation Down to 0.5V

♦ Low Quiescent Current Consumption of 2.5mA

♦ Integrated Digital Output Margining Circuit Saves

External Parts and Board Space

♦ 30ns Propagation Delay Time from Pulse Input

to Output

♦ Automatic Detection of Discontinuous Current

Conduction and Turn-Off of the Freewheeling MOSFET

♦ High Efficiency at Low Output Currents and

Reverse-Current Protection

♦ Open-Drain Overtemperature Warning Flag

♦ 28-Pin Thermally Enhanced TSSOP Package

MAX5058/MAX5059

Parallelable Secondary-Side Synchronous Rectifier

Driver and Feedback-Generator Controller ICs

________________________________________________________________ Maxim Integrated Products 1

19-3045; Rev 0; 10/03

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.

Pin Configuration appears at end of data sheet.

Ordering Information

*EP = Exposed paddle.

PART TEMP RANGE

MAX5058AUI -40°C to +125°C 28 TSSOP-EP* 5

MAX5058EUI -40°C to +85°C 28 TSSOP-EP* 5

MAX5059AUI -40°C to +125°C 28 TSSOP-EP* 10

MAX5059EUI -40°C to +85°C 28 TSSOP-EP* 10

PINPACKAGE

REG

(V)

MAX5058/MAX5059

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +12V, GND = PGND = 0, VDR = V

REG

, C

QSYNC

= C

QREC

= 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, V

IREF

VSP

= 1.785V, C

VREG

= 2.2µF, CVP= 1µF, C

COMPS

= 0.1µF, C

SFP

= 68nF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at T

= +25°C.)

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

PGND to GND .......................................................-0.3V to +0.3V

COMPV, V

REG

, VDR, TSF to GND......................... -0.3V to +14V

All Other Pins to GND ..................................-0.3V to (VP + 0.3V)

REG

Source Current .........................................................50mA

COMPV, RMGU, RMGD, TSF Sink Current ....................... 30mA

VP to GND ................................................................-0.3V to +6V

VSO, CSO Source/Sink Current ......................................... ±5mA

SFP Source Current ............................................................. 5mA

QREC, QSYNC Continuous Current....................................50mA

QREC, QSYNC Current < 500ns..............................................5A

Continuous Power Dissipation (T

= +70°C)

28-Pin TSSOP (derate 23.8mW/°C above +70°C). ....1905mW

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

Operating Temperature Ranges

MAX5058EUI, MAX5059EUI ............................-40°C to +85°C

MAX5058AUI, MAX5059AUI..........................-40°C to +125°C

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

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER SUPPLY

Supply Voltage Range V+

Quiescent Supply Current I

Switching Supply Current I

: REFERENCE CURRENT OUTPUT

REF

Reference Current I Reference Current Variation ∆I

Reference Voltage Compliance Range

: LOW-DROPOUT REGULATOR

REG

Regulator Output V

Line Regulation

Dropout V

VP: INTERNAL REGULATOR

Regulator Output Setpoint V

ZC: ZERO-CURRENT COMPARATOR

Zero-Current Comparator Threshold

Zero-Current Comparator Input Current

MAX5058 4.5 28.0

MAX5059 9.3 28.0

IREF

VREGIVREG

DROP

ZCTH

fSW = 250kHz at BUFIN

Guaranteed by reference current variation test

MAX5058, V+ = 6V to 28V 25

MAX5059, V+ = 11V to 28V 25

MAX5058

MAX5059

IVP = 0 to 5mA 3.8 4.3 V

TA = +25°C +3.5 +5 +6.5 mV

= 1.785V 49.2 50 51.1 µA

IREF

= 0.5V to 2.5V -0.1 +0.1 %/V

IREF

= 0 to 30mA

MAX5058 4.5

MAX5059 6

MAX5058 4.75 5 5.25

MAX5059 9.4 10 10.6

V+ I

= 4.5V,

VREG

= 9.3V,

VREG

= 30mA

2.5 5 mA

0.5 2.5 V

200 350

-2.5 +2.5 µA

MAX5058/MAX5059

Parallelable Secondary-Side Synchronous Rectifier

Driver and Feedback-Generator Controller ICs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +12V, GND = PGND = 0, VDR = V

REG

, C

QSYNC

= C

QREC

= 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, V

IREF

VSP

= 1.785V, C

VREG

= 2.2µF, CVP= 1µF, C

COMPS

= 0.1µF, C

SFP

= 68nF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Zero-Current Comparator Input Range

Zero-Current Comparator Propagation Delay

BUFIN: SYNCHRONIZING PULSE INPUT

BUFIN to Output Propagation Delay

BUFIN Input Current I

BUFIN Input Capacitance C

BUFIN Input-Logic High V

BUFIN Input-Logic Low V

MARGINING INPUTS

RMGD Resistance R

RMGU Resistance R

MRGD Input-Logic High V

MRGD Input-Logic Low V

MRGU Input-Logic High V

MRGU Input-Logic Low V

MRGU, MRGD Input Resistance

RMGU, RMGD Leakage Current

DRIVER OUTPUTS

QREC, QSYNC Peak Source Current

QREC, QSYNC Output-Voltage High

QREC, QSYNC Low-to-High Delay Time

QREC, QSYNC Peak Sink Current

QREC, QSYNC Output-Voltage Low

QREC, QSYNC High-to-Low Delay Time

BUFIN

HBUFIN

LBUFIN

RMGD

RMGU

HMRGD

LMRGD

HMRGU

LMRGU

MRGD

MRGU

RMGU

RMGD

QREC_SO,

QSYNC_SO

QREC_H,

QSYNC_H

PDLH

QREC_SI,

QSYNC_SI

QREC_L,

QSYNC_L

PDHL

10mV overdrive, from when V greater than V

ZCTH

low

BUFIN rising to QREC rising or QSYNC falling

Sinking 10mA 6.5 11 Ω Sinking 10mA 6.5 11 Ω

Measured with respect to V

, sourcing 50mA

VDR

QREC

= C

= 0 30

QSYNC

= 5nF 70

QSYNC

Sinking 50mA

QREC

= C

= 0 40

QSYNC

= 5nF 70

QSYNC

- V

ZCP

ZCN

to when QSYNC goes

MAX5058 75 150

MAX5059 75 150

MAX5058 50 100

MAX5059 50 100

-0.1 +1.5 V

65 ns

40 ns

-1 +1 µA

10 pF

2.4 V

0.8 V

2.4 V

0.8 V

2.4 V

0.8 V

40 kΩ

-100 +100 nA

MAX5058/MAX5059

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +12V, GND = PGND = 0, VDR = V

REG

, C

QSYNC

= C

QREC

= 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, V

IREF

VSP

= 1.785V, C

VREG

= 2.2µF, CVP= 1µF, C

COMPS

= 0.1µF, C

SFP

= 68nF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at T

= +25°C.)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ERROR AMPLIFIER

Inverting Input Current I

Error-Amplifier Input Range V

Error-Amplifier Input Offset V

Error-Amplifier Output-Voltage Low

Error-Amplifier Unity-Gain BW GBW R

Error-Amplifier Voltage Gain A

Error-Amplifier PSRR PSRR 60 dB

COMPV Output Resistance to Ground

REMOTE-SENSE AMPLIFIER (RSA)

VSN Input Current I

VSP Input Current I

Input Common-Mode Range -0.3 +3.8 V

Input Offset Voltage V Output Impedance 8 Ω

Amplifier -3dB Frequency I

Remote-Sense Amplifier Gain G

CURRENT-SENSE AMPLIFIER (CSA)

CSN Input Current I

CSP Input Current I

Input Offset Voltage I

Current-Sense Amplifier Gain G

Input Differential-Mode Range 100 mV

Input Common-Mode Range -0.3 +3.8 V

Output-Voltage Level Shift V

Output Voltage Range V

Amplifier -3dB Frequency f

SHARE-FORCE AMPLIFIER (SFA)

Sink Current 60 µA

Source Current 500 µA

INV

COMPVICOMPV

VOL

COMPV

COMP

COMPV

(Note 1) 1 MΩ

VSN

VSP

OSRSAIVSO

VSO

CSN

CSP

CSAICSO

CSO(MIN

-3dB

VSO

-0.3V ≤ V

CSO

(Note 2) 0.415 0.570 V

CSO

-50 +50 nA

0 2.5 V

= 100µA to 5mA -5 +5 mV

= 5mA 200 mV

= 220Ω, I

= 5mA 1.3 MHz

COMP

= 5mA 80 dB

COMP

-100 +100 µA

-20 +100 µA

= -0.5mA to +0.5mA -4 mV

= -0.5mA to +0.5mA 1 MHz

= -0.5mA to +0.5mA 0.9925 1 1.0075 V/V

≤ +3.8V,

CSN

≤ +3.8V

CSP

≤ +3.8V -40 +150 µA

CSP

-150 +150 µA

= -500µA to +500µA (Note 2) +20 +25 +30 mV

= -500µA to +500µA 19.8 20 20.2 V/V

= -500µA to +500µA 0.1 3.0 V

= -500µA to +500µA 50 kHz

MAX5058/MAX5059

Parallelable Secondary-Side Synchronous Rectifier

Driver and Feedback-Generator Controller ICs

_______________________________________________________________________________________ 5

Note 1: Output resistance to ground used for unity-gain stability. Note 2: V

CSO

= G

CSA(VCSP

- V

CSN

) + VLS.

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +12V, GND = PGND = 0, VDR = V

REG

, C

QSYNC

= C

QREC

= 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, V

IREF

VSP

= 1.785V, C

VREG

= 2.2µF, CVP= 1µF, C

COMPS

= 0.1µF, C

SFP

= 68nF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CURRENT-ADJUST AMPLIFIER (CAA)

Transconductance 500 µA/V

Common-Mode Input Voltage Range

Output Voltage Range 0.85 2.75 V

Offset Voltage TA = +25°C204265mV

Open-Loop Gain 72 dB

CURRENT-ADJUST VOLTAGE-TO-CURRENT CONVERTER

Input Voltage Range 0.75 2.75 V

Input Voltage Offset 1.25 V

Output Voltage Range 0.5 2.5 V

Transconductance 1.15 µA/V

Maximum Current Adjustment Value

THERMAL SHUTDOWN

Thermal Warning Flag Level When TSF pulls low +125 °C Thermal Warning Flag Hysteresis 15 °C Internal Thermal-Shutdown Level +160 °C

Internal Thermal-Shutdown Hysteresis

TSF Maximum Output Voltage I

TSF Output Leakage Current 0.1 µA

= 5mA 120 mV

TSF

0.45 2.55 V

1.38 1.5 1.66 µA

15 °C

MAX5058/MAX5059

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs

6 _______________________________________________________________________________________

Typical Operating Characteristics

(V+ = +12V, GND = PGND = 0, VDR = V

REG

, C

QSYNC

= C

QREC

= 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, V

IREF

VSP

= 1.785V, V

COMPS

= 0.5V, C

VREG

= 2.2µF, CVP= 1µF, C

COMPS

= 0.1µF, C

SFP

= 68nF, TA= +25°C, unless otherwise noted.)

LDO OUTPUT VOLTAGE (V

VREG

)

vs. INPUT VOLTAGE (MAX5058)

MAX5058/59 toc01

V+ (V)

VREG

(V)

272418 216 9 12 153

4.9995

5.0000

5.0005

5.0010

5.0015

5.0020

5.0025

5.0030

5.0035

5.0040

5.0045

5.0050

4.9990 030

VREG

= 0mA

REF

OUTPUT CURRENT

vs. TEMPERATURE

MAX5058/59 toc02

TEMPERATURE (°C)

REF

(µA)

1109565 80-10 5 20 35 50-25

49.95

49.97

49.99

50.01

50.03

50.05

50.07

50.09

50.11

50.13

50.15

50.17

49.93

-40 125

IREF

= 1.785V

LDO OUTPUT VOLTAGE (V

VREG

)

vs. LOAD CURRENT (MAX5059)

MAX5058/59 toc03

VREG

(mA)

VREG

(V)

1009070 8020 30 40 50 6010

9.84

9.86

9.88

9.90

9.92

9.94

9.96

9.98

10.00

10.02

10.04

10.06

10.08

10.10

9.82

9.80 0 110

LDO OUTPUT VOLTAGE (V

VREG

)

vs. LOAD CURRENT (MAX5058)

MAX5058/59 toc04

VREG

(mA)

VREG

(V)

1009070 8020 30 40 50 6010

4.88

4.90

4.92

4.94

4.96

4.98

5.00

5.02

5.04

4.86 0 110

LDO OUTPUT VOLTAGE (V

REG

)

vs. TEMPERATURE (MAX5058)

MAX5058/59 toc05

TEMPERATURE (°C)

VREG

(V)

1109565 80-10 15 20 35 50-25

4.984

4.986

4.988

4.990

4.992

4.994

4.996

4.998

5.000

5.002

5.004

5.006

5.008

5.010

4.982

4.980

-40 125

LDO OUTPUT VOLTAGE (V

VREG

)

vs. INPUT VOLTAGE (MAX5059)

MAX5058/59 toc06

V+ (V)

VREG

(V)

272418 216 9 12 153

10.000

10.002

10.004

10.006

10.008

10.010

10.012

10.014

10.016

10.018

10.020

9.998

030

LDO OUTPUT VOLTAGE (V

VREG

)

vs. TEMPERATURE (MAX5059)

MAX5058/59 toc07

TEMPERATURE (°C)

VREG

(V)

1109565 80-10 5 20 35 50-25

9.985

9.990

9.995

10.000

10.005

10.010

10.015

10.020

10.025

10.030

9.980

-40 125

REF

OUTPUT CURRENT

vs. I

REF

OUTPUT VOLTAGE

MAX5058/59 toc08

IREF

(V)

IREF

(µA)

3.53.02.0 2.51.0 1.50.5

46.5

47.0

47.5

48.0

48.5

49.0

49.5

50.0

50.5

51.0

46.0 0 4.0

SWITCHING SUPPLY CURRENT

vs. TEMPERATURE (MAX5058)

MAX5058/59 toc14

TEMPERATURE (°C)

V+

(mA)

1109565 80-10 5 20 35 50-25

3.2

3.4

3.6

3.8

4.0

4.2

4.4

4.6

4.8

5.0

3.0

-40 125

fSW = 250kHz

SWITCHING SUPPLY CURRENT

vs. INPUT VOLTAGE (MAX5059)

MAX5058/59 toc15

V+ (V)

V+

(mA)

2723 259 11131517192157

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

329

fSW = 250kHz

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE (MAX5059)

MAX5058/59 toc12

TEMPERATURE (°C)

V+

(mA)

1109565 80-10 5 20 35 50-25

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.0

2.0

-40 125

SWITCHING SUPPLY CURRENT

vs. INPUT VOLTAGE (MAX5058)

MAX5058/59 toc13

V+ (V)

V+

(mA)

2723 2591113151719215

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

329

fSW = 250kHz

MAX5058/MAX5059

Parallelable Secondary-Side Synchronous Rectifier

Driver and Feedback-Generator Controller ICs

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(V+ = +12V, GND = PGND = 0, VDR = V

REG

, C

QSYNC

= C

QREC

= 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, V

IREF

VSP

= 1.785V, V

COMPS

= 0.5V, C

VREG

= 2.2µF, CVP= 1µF, C

COMPS

= 0.1µF, C

SFP

= 68nF, TA= +25°C, unless otherwise noted.)

QUIESCENT SUPPLY CURRENT

vs. INPUT VOLTAGE (MAX5058)

3.0

2.8

2.6

2.4

2.2

2.0

1.8

1.6

(mA)

1.4

V+

1.2

1.0

0.8

0.6

0.4

0.2 0

030

V+ (V)

3.0

2.8

2.6

2.4

MAX5058/59 toc09

2.2

2.0

1.8

1.6

(mA)

V+

1.4

1.2

1.0

0.8

0.6

0.4

0.2 0

272418 216 9 12 153

030

QUIESCENT SUPPLY CURRENT

vs. INPUT VOLTAGE (MAX5059)

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE (MAX5058)

2.60

2.55

2.50

MAX5058/59 toc10

2.45

2.40

2.35

(mA)

2.30

V+

2.25

2.20

2.15

2.10

2.05

272418 216 9 12 153

V+ (V)

2.00

-40 125

TEMPERATURE (°C)

1109565 80-10 5 20 35 50-25

MAX5058/59 toc11

MAX5058/MAX5059

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V+ = +12V, GND = PGND = 0, VDR = V

REG

, C

QSYNC

= C

QREC

= 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, V

IREF

VSP

= 1.785V, V

COMPS

= 0.5V, C

VREG

= 2.2µF, CVP= 1µF, C

COMPS

= 0.1µF, C

SFP

= 68nF, TA= +25°C, unless otherwise noted.)

SWITCHING SUPPLY CURRENT

vs. TEMPERATURE (MAX5059)

MAX5058/59 toc16

TEMPERATURE (°C)

V+

(mA)

1109565 80-10 5 20 35 50-25

4.2

4.4

4.6

4.8

5.0

5.2

5.4

5.6

5.8

6.0

4.0

-40 125

fSW = 250kHz

REMOTE-SENSE AMPLIFIER (RSA) GAIN

vs. TEMPERATURE

MAX5058/59 toc17

TEMPERATURE (°C)

VSO OUTPUT (dB)

11095-25 -10 5 35 50 6520 80

0.008

0.009

0.010

0.011

0.012

0.013

0.014

0.015

0.007

-40 125

VSP

= 1.785V

RSA GAIN

vs. FREQUENCY

MAX5058/59 toc18

FREQUENCY (Hz)

GAIN (dB)

10M1M10k 100k1k0.1k

-35

-30

-25

-20

-15

-10

-5

-40 0 100M

CSA GAIN

vs. FREQUENCY

MAX5058/59 toc21

FREQUENCY (Hz)

GAIN (dB)

1k1001010.1

-15

-10

-5

-20

0.01 10k

ZERO-CURRENT COMPARATOR THRESHOLD

vs. TEMPERATURE

MAX5058/59 toc22

TEMPERATURE (°C)

ZCP THRESHOLD (mV)

11095-25 -10 5 35 50 6520 80

5.05

5.10

5.15

5.20

5.25

5.30

5.35

5.40

5.00

-40 125

CURRENT-SENSE AMPLIFIER (CSA) GAIN

vs. TEMPERATURE

MAX5058/59 toc19

TEMPERATURE (°C)

CSA GAIN (V/V)

11095-25 -10 5 35 50 6520 80

19.97

19.98

19.99

20.00

20.01

20.02

20.03

20.04

19.96

-40 125

CSP

= 100mV

CSA INPUT OFFSET

vs. TEMPERATURE

MAX5058/59 toc20

TEMPERATURE (°C)

INPUT OFFSET (mV)

1109565 80-10 5 20 35 50-25

24.1

24.2

24.3

24.4

24.5

24.6

24.7

24.8

24.9

25.0

25.1

24.0

-40 125

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