MAXIM MAX5060, MAX5061 User Manual

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General Description

The MAX5060/MAX5061 pulse-width modulation (PWM)
DC-DC controllers provide high-output-current capability
in a compact package with a minimum number of exter­nal components. These devices utilize an average-cur­rent-mode control that enables optimal use of low
R

DS(ON)

MOSFETs, eliminating the need for external

heatsinks even when delivering high output currents.

Differential sensing (MAX5060) enables accurate control
of the output voltage, while adaptive voltage positioning
provides optimum transient response. An internal regula­tor enables operation with 4.75V to 5.5V or 7V to 28V
input voltage ranges. The high switching frequency, up
to 1.5MHz, allows the use of low-output inductor values
and input capacitor values. This accommodates the use
of PC-board-embedded planar magnetics.

The MAX5060 features a clock output with 180° phase
delay to control a second out-of-phase converter for
lower capacitor ripple currents. The MAX5060 also limits
the reverse current if the bus voltage becomes higher
than the regulated output voltage. The MAX5060 is
specifically designed to limit current sinking when multi­ple power-supply modules are paralleled. The
MAX5060/MAX5061 offer an adjustable 0.6V to 5.5V out­put voltage. The MAX5060 offers an overvoltage protec­tion, power-good signal, and an output enable function.

The MAX5060/MAX5061 operate over the automotive
temperature range (-40°C to +125°C). The MAX5060 is
available in a 28-pin thin QFN package while the
MAX5061 is available in a 16-pin TSSOP package.

Applications

Servers and Workstations

Point-of-Load Telecom DC-DC Regulators

Networking Systems

RAID Systems

High-End Desktop Computers

Features

♦ 4.75V to 5.5V or 7V to 28V Input Voltage Range

♦ Adjustable Output Voltage from 0.6V to 5.5V

♦ Up to 30A Output Current

♦ Can Parallel Outputs For Higher Output Current

♦ Programmable Adaptive Output Voltage

Positioning

♦ True-Differential Remote Output Sensing

(MAX5060)

♦ Average-Current-Mode Control

• Superior Current Sharing Between Paralleled
Modules

• Accurate Current Limit Eliminates MOSFET
and Inductor Derating

♦ Limits Reverse Current Sinking in Paralleled

Modules (MAX5060)

♦ Programmable Switching Frequency from 125kHz

to 1.5MHz

♦ Integrated 4A Gate Drivers

♦ Clock Output for 180° Out-of-Phase Operation

(MAX5060)

♦ Voltage Signal Proportional to Output Current for

Load Monitoring (MAX5060)

♦ Output Overvoltage Crowbar Protection

(MAX5060)

♦ Programmable Hiccup Current-Limit Threshold

and Response Time

♦ Overtemperature Thermal Shutdown

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,

Average-Current-Mode DC-DC Controllers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

Selector Guide

PART TEMP RANGE

PKG
CODE

MAX5060ATI

28 TQFN-EP*

T2855-3

MAX5060ETI

28 TQFN-EP*

T2855-3

MAX5061AUE

U16E-3

MAX5061EUE

U16E-3

PART OUTPUT

MAX5060

Average-Current-Mode DC-DC Controller
for 5V/12V/24V Input Bus with CLKOUT,
Load Monitoring, Overvoltage, EN Input,
SYNC Input, and PGOOD Output

MAX5061

Average-Current-Mode DC-DC Controller
for 5V/12V/24V Input with SYNC/ENABLE
Input

19-3583; Rev 2; 7/05

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 Configurations appear at end of data sheet.

*EP = Exposed pad.

-40°C to +125°C

-40°C to +85°C

-40°C to +125°C 16 TSSOP-EP*

-40°C to +85°C 16 TSSOP-EP*

PIN-PACKAGE

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers

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.

IN to SGND.............................................................-0.3V to +30V

BST to SGND..........................................................-0.3V to +35V

DH to LX .......................................-0.3V to [(V

BST

- V

LX_

) + 0.3V]

DL to PGND (MAX5060).............................-0.3V to (V

DD

+ 0.3V)

DL to PGND (MAX5061).............................-0.3V to (V

CC

+ 0.3V)

BST to LX..................................................................-0.3V to +6V

V

CC

to SGND............................................................-0.3V to +6V

V

CC

, VDDto PGND ...................................................-0.3V to +6V

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

Current Sink in PGOOD ........................................................6mA

All Other Pins to SGND...............................-0.3V to (V

CC

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TSSOP (derate 21.3mW/°C above +70°C)* ......1702mW

28-Pin TQFN (derate 34.5mW/°C above +70°C)*......2758mW

Operating Temperature Range

MAX5060A_ _ and MAX5061A_ _ .................-40°C to +125°C

MAX5060E_ _ and MAX5061E_ _....................-40°C to +85°C

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

Storage Temperature Range .............................-60°C to +150°C

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

*Per JEDEC 51 standard.

ELECTRICAL CHARACTERISTICS

(VCC= 5V, VDD= VCC(MAX5060 only), TA= TJ= T

MIN

to T

MAX

, unless otherwise noted. Typical specifications are at TA= +25°C.)

(Note 1)

PARAMETER SYMBOL CONDITIONS

MIN

TYP

MAX

UNITS

SYSTEM SPECIFICATIONS

728

Input Voltage Range V

IN

Short IN and VCC together for 5V input
operation

V

Quiescent Supply Current I

Q

EN = VCC or SGND, not switching 2.7 5.5 mA

Efficiency η I

LOAD

= 20A, VIN = 12V, V

OUT

= 3.3V 90 %

OUTPUT VOLTAGE

No load, VCC = 4.75V to 5.5V,
f

SW

= 500kHz

0.6

SENSE+ to SENSE- Accuracy
(MAX5060) (Note 2)

0.6

V

Soft-Start Time t

SS

Clock

Cycles

No load, VCC = 4.75V to 5.5V,
no switching

0.6

EAN Reference Voltage
(MAX5061)

V

REF

0.6

V

STARTUP/INTERNAL REGULATOR

VCC Undervoltage Lockout UVLO VCC rising 4.1 4.3 4.5 V

VCC Undervoltage Lockout
Hysteresis

mV

VCC Output Voltage

5.1

V

MOSFET DRIVERS

Output-Driver Impedance R

ON

Low or high output,
I

SOURCE/SINK

= 20mA

1.1 3 Ω

Output-Driver Source/Sink Current

I

DH_

, I

DL_

4A

Nonoverlap Time t

NO

C

DH/DL

= 5nF 35 ns

4.75 5.50

No load, VIN = 7V to 28V, fSW = 500kHz 0.594

No load, VIN = 7V to 28V, no switching 0.591

VIN = 7V to 28V, I

= 0 to 60mA 4.85

SOURCE

0.594

1024

0.591

200

0.606

0.606

0.606

0.606

5.30

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,

Average-Current-Mode DC-DC Controllers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 5V, VDD= VCC(MAX5060 only), TA= TJ= T

MIN

to T

MAX

, unless otherwise noted. Typical specifications are at TA= +25°C.)

(Note 1)

PARAMETER SYMBOL CONDITIONS

MIN

TYP

MAX

UNITS

OSCILLATOR

Switching Frequency Range 125

kHz

RT = 500kΩ 121

RT = 120kΩ 495

Switching Frequency f

SW

RT = 39.9kΩ

kHz

120kΩ ≤ RT ≤ 500kΩ -5 +5

Switching Frequency Accuracy

40kΩ ≤ R

T

≤ 120kΩ -8 +8

%

CLKOUT Phase Shift (MAX5060)

φ

CLKOUT

fSW = 125kHz

degrees

CLKOUT Output Low Level
(MAX5060)

V

CLKOUTLISINK

= 2mA 0.4 V

CLKOUT Output High Level
(MAX5060)

V

CLKOUTHISOURCE

= 2mA 4.5 V

SYNC Input-High Pulse Width t

SYNC

RT/SYNC (MAX5060), RT/SYNC/EN
(MAX5061)

200 ns

SYNC Input Clock High Threshold

V

SYNCH

RT/SYNC (MAX5060), RT/SYNC/EN
(MAX5061)

2.0 V

SYNC Input Clock Low Threshold

V

SYNCL

RT/SYNC (MAX5060), RT/SYNC/EN
(MAX5061)

0.4 V

SYNC Pullup Current I

SYNC_OUT

V

RT/SYNC

= 0V (MAX5060),

V

RT/SYNC/EN

= 0V (MAX5061)

µA

SYNC Power-Off Level V

SYNC_OFF

0.4 V

CURRENT LIMIT

Average Current-Limit Threshold

V

CL

CSP to CSN

mV

Reverse Current-Limit Threshold V

CLR

CSP to CSN (MAX5060)

mV

Cycle-by-Cycle Current Limit CSP to CSN 60 mV

Cycle-by-Cycle Overload
Response Time

V

CSP

to V

CSN

= 75mV

ns

Hiccup Divider Ratio LIM to VCM, no switching

V/V

Hiccup Reset Delay

ms

LIM Input Impedance LIM to SGND

kΩ

CURRENT-SENSE AMPLIFIER

CSP to CSN Input Resistance R

CS

4kΩ

Common-Mode Range V

CMR(CS)

VIN = 7V to 28V 0 5.5 V

Input Offset Voltage V

OS(CS)

0.1 mV

Amplifier Gain A

V(CS)

V/V

3dB Bandwidth f

3dB

4

MHz

1515 1620 1725

24.0 26.9 28.2

-3.2 -2.3 -0.1

0.547 0.558 0.565

125 129

521 547

180

250 750

260

200

55.9

34.5

1500

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 5V, VDD= VCC(MAX5060 only), TA= TJ= T

MIN

to T

MAX

, unless otherwise noted. Typical specifications are at TA= +25°C.)

(Note 1)

PARAMETER SYMBOL CONDITIONS

MIN

TYP

MAX

UNITS

CURRENT-ERROR AMPLIFIER (Transconductance Amplifier)

Transconductance g

C

µS

Open-Loop Gain A

VOL(CE)

No load 50 dB

DIFFERENTIAL VOLTAGE AMPLIFIER (DIFF, MAX5060 only)

Common-Mode Voltage Range V

CMR(DIFF)

0

V

DIFF Output Voltage V

CM

V

SENSE+

= V

SENSE-

= 0V 0.6 V

Input Offset Voltage V

OS(DIFF)

-1 +1 mV

Amplifier Gain A

V(DIFF)

1

V/V

3dB Bandwidth f

3dB

C

DIFF

= 20pF 3

MHz

Minimum Output-Current Drive I

OUT(DIFF)

4mA

SENSE+ to SENSE- Input
Resistance

R

VS

V

SENSE-

= 0V 50

kΩ

V_IOUT AMPLIFIER (V_IOUT, MAX5060 only)

Gain-Bandwidth Product V

V_IOUT

= 2.0V 4

MHz

3dB Bandwidth V

V_IOUT

= 2.0V 1.0

MHz

Output Sink Current 30 µA

Output Source Current 90 µA

Maximum Load Capacitance 50 pF

V_IOUT Output to I

OUT

Transfer

Function

R

SENSE

= 1mΩ,

100mV ≤ V_IOUT ≤ 5.5V

mV/A

Offset Voltage 1mV

VOLTAGE-ERROR AMPLIFIER (EAOUT)

Open-Loop Gain A

VOLEA

70 dB

Unity-Gain Bandwidth f

GBW

3

MHz

V

EAN

= 2.0V (MAX5060)

EAN Input Bias Current I

B(EA)

V

EAN

= 0.4V, V

EAOUT

= GND

(MAX5061)

µA

Error-Amplifier Output-Clamping
Voltage

V

CLAMP(EA)

With respect to VCM (MAX5060),
with respect to SGND (MAX5061)

883

mV

POWER-GOOD AND OVERVOLTAGE PROTECTION (MAX5060 only)

PGOOD Trip Level V

UV

PGOOD goes low when V

OUT

is below

this threshold

90

%V

OUT

PGOOD Output Low Level V

PGLO

I

SINK

= 4mA 0.4 V

PGOOD Output Leakage Current

I

PG

PGOOD = V

CC

1µA

OVI Trip Threshold OVP

TH

With respect to SGND

V

OVI Input Bias Current I

OVI

0.2 µA

550

+1.0

0.994

1.006

100

132.3 135 137.7

-0.2 0.03 +0.2

930 976

87.5

1.244 1.276 1.308

92.5

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,

Average-Current-Mode DC-DC Controllers

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 5V, VDD= VCC(MAX5060 only), TA= TJ= T

MIN

to T

MAX

, unless otherwise noted. Typical specifications are at TA= +25°C.)

(Note 1)

PARAMETER SYMBOL CONDITIONS

MIN

TYP

MAX

UNITS

ENABLE INPUTS

EN Input High Voltage (MAX5060)

V

EN

EN rising

2.5

V

EN Input Hysteresis (MAX5060)

V

EN Pullup Current (MAX5060) I

EN

15

µA

RT/SYNC/EN Input High Voltage
Enable (MAX5061)

1.6 V

RT/SYNC/EN Input Low Voltage
Disable (MAX5061)

0.4 V

THERMAL SHUTDOWN

Thermal Shutdown Temperature rising

°C

Thermal-Shutdown Hysteresis 30 °C

Note 1: Specifications at TA= +25°C are 100% tested. Specifications over the temperature range are guaranteed by design.
Note 2: Does not include an error due to finite error amplifier gain (see the Voltage-Error Amplifier section).

V

RT/SYNC/EN_H

V

RT/SYNC/EN_L

2.437

0.28

13.5

+150

2.562

16.5

EFFICIENCY vs. OUTPUT CURRENT

AND INPUT VOLTAGE

MAX5060 toc01

OUTPUT CURRENT (A)

η (%)

181612 144 6 8 102

10

20

30

40

50

60

70

80

90

100

0

020

V

OUT

= 3.3V

f

SW

= 250kHz

VIN = 5V

VIN = 12V

EFFICIENCY vs. OUTPUT CURRENT

AND INPUT VOLTAGE

MAX5060 toc02

OUTPUT CURRENT (A)

η (%)

181612 144 6 8 102

10

20

30

40

50

60

70

80

90

100

0

020

V

OUT

= 0.6V

f

SW

= 250kHz

VIN = 5V

VIN = 12V

EFFICIENCY vs. OUTPUT CURRENT

MAX5060 toc03

OUTPUT CURRENT (A)

η (%)

181612 144 6 8 102

10

20

30

40

50

60

70

80

90

100

0

020

VIN = 24V
V

OUT

= 3.3V

f

SW

= 125kHz

EFFICIENCY vs. OUTPUT CURRENT

AND OUTPUT VOLTAGE

MAX5060 toc04

OUTPUT CURRENT (A)

η (%)

181612 144 6 8 102

10

20

30

40

50

60

70

80

90

100

0

020

VIN = 12V
f

SW

= 250kHz

V

OUT

= 5V

V

OUT

= 3.3V

V

OUT

= 0.6V

V

OUT

= 1V

V

OUT

= 1.8V

EFFICIENCY vs. OUTPUT CURRENT

AND OUTPUT VOLTAGE

MAX5060 toc05

OUTPUT CURRENT (A)

η (%)

181612 144 6 8 102

10

20

30

40

50

60

70

80

90

100

0

020

VIN = 5V
f

SW

= 500kHz

V

OUT

= 3.3V

V

OUT

= 1.8V

V

OUT

= 1V

V

OUT

= 0.6V

SUPPLY CURRENT (IQ) vs. FREQUENCY

MAX5060 toc06

FREQUENCY (kHz)

SUPPLY CURRENT (mA)

13001100900700500300

10

20

30

40

50

60

0

100 1500

EXTERNAL CLOCK
NO DRIVER LOAD

VIN = 12V

VIN = 24V

VIN = 5V

SUPPLY CURRENT vs. TEMPERATURE

MAX5060 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

603510-15

62

64

66

68

70

60

-40 85

VIN = 12V
f

SW

= 250kHz

C

DL/CDH

= 22nF

CURRENT-SENSE THRESHOLD

vs. OUTPUT VOLTAGE

MAX5060 toc08

V

OUT

(V)

(V

CSP

- V

CSN

) (mV)

4321

26.5

27.0

27.5

28.0

28.5

29.0

26.0
05

VIN = 12V
f

SW

= 250kHz

HICCUP CURRENT LIMIT vs. R

EXT

MAX5060 toc09

R

EXT

(MΩ)

CURRENT LIMIT (A)

161284

23.5

24.0

24.5

25.0

25.5

26.0

23.0
020

VIN = 12V
f

SW

= 250kHz

R1 = 1mΩ
V

OUT

= 1.5V

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers

6 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, Figures 1 and 2, unless otherwise noted.)

LOW-SIDE DRIVER (DL) SINK

AND SOURCE CURRENT

MAX5060 toc16

3A/div

100ns/div

C

LOAD

= 22nF

V

IN

= 12V

Typical Operating Characteristics (continued)

(TA = +25°C, Figures 1 and 2, unless otherwise noted.)

OUTPUT VOLTAGE vs. OUTPUT CURRENT

AND ERROR AMPLIFIER GAIN (R

F/RIN

)

MAX5060 toc10

OUTPUT CURRENT (A)

OUTPUT VOLTAGE (V)

181612 144 6 8 102

1.325

1.350

1.375

1.400

1.425

1.450

1.475

1.500

1.525

1.550

1.575

1.600

1.300

020

VIN = 12V
f

SW

= 250kHz

V

OUT

= 1.5V

RF/RIN = 40

RF/RIN = 10

RF/RIN = 20

V_IOUT VOLTAGE vs. LOAD CURRENT

MAX5060 toc11

LOAD CURRENT (A)

V

V_IOUT

(V)

15105

0.5

1.0

1.5

2.0

2.5

3.0

0

020

V

OUT

= 3.3V

R1 = 1m

Ω

MAX5060

VIN = 12V

VIN = 7V

VIN = 24V

VCC LOAD REGULATION

vs. INPUT VOLTAGE

MAX5060 toc12

VCC LOAD CURRENT (mA)

V

CC

(V)

125100755025

4.85

4.95

5.05

5.15

5.25

4.75
0150

VIN = 12V

VIN = 5V

VIN = 24V

DRIVER RISE TIME

vs. DRIVER LOAD CAPACITANCE

MAX5060 toc13

CAPACITANCE (nF)

t

R

(ns)

2116116

20

40

60

80

100

0

1

VIN = 12V
f

SW

= 250kHz

DH

DL

DRIVER FALL TIME

vs. DRIVER LOAD CAPACITANCE

MAX5060 toc14

CAPACITANCE (nF)

t

F

(ns)

2116116

20

40

60

80

100

0

1

VIN = 12V
f

SW

= 250kHz

DH

DL

HIGH-SIDE DRIVER (DH) SINK

AND SOURCE CURRENT

MAX5060 toc15

2A/div

100ns/div

C

LOAD

= 22nF

V

IN

= 12V

HIGH-SIDE DRIVER (DH) RISE TIME

MAX5060 toc17

2V/div

40ns/div

C

LOAD

= 22nF

V

IN

= 12V

HIGH-SIDE DRIVER (DH) FALL TIME

MAX5060 toc18

2V/div

40ns/div

C

LOAD

= 22nF

V

IN

= 12V

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,

Average-Current-Mode DC-DC Controllers

_______________________________________________________________________________________ 7

REVERSE CURRENT SINK

vs. TEMPERATURE

MAX5060 toc25

TEMPERATURE (°C)

SINK CURRENT (A)

603510-15

1.6

1.8

2.0

2.2

2.4

1.4

-40

VIN = 12V
V

0UT

= 1.5V

R1 = 1m

Ω

V

EXTERNAL

= 3.3V

V

EXTERNAL

= 2V

85

LOW-SIDE DRIVER (DL) RISE TIME

MAX5060 toc19

2V/div

40ns/div

C

LOAD

= 22nF

V

IN

= 12V

LOW-SIDE DRIVER (DL) FALL TIME

MAX5060 toc20

2V/div

40ns/div

C

LOAD

= 22nF

V

IN

= 12V

OUTPUT RIPPLE

MAX5060 toc21

50mV/div

1µs/div

VIN = 12V
V

OUT

= 1.5V

I

OUT

= 20A

INPUT STARTUP RESPONSE

MAX5060 toc22

V

OUT

2V/div

2ms/div

VIN = 12V
V

OUT

= 1.5V

I

OUT

= 20A

V

PGOOD

5V/div

V

IN

5V/div

ENABLE STARTUP RESPONSE

MAX5060 toc23

V

OUT

2V/div

2ms/div

VIN = 12V
V

OUT

= 1.5V

I

OUT

= 20A

V

PGOOD

5V/div

V

EN

2V/div

LOAD-TRANSIENT RESPONSE

MAX5060 toc24

100µs/div

VIN = 12V
V

OUT

= 3.3V

I

STEP

= 5A TO 20A

SLEW = 2A/µs

V

OUT

200mV/div

I

OUT

10A/div

0

REVERSE CURRENT SINK AT INPUT TURN-ON

(V

IN

= 12V, V

OUT

= 1.5V, V

EXTERNAL

= 2.0V)

MAX5060 toc26

200µs/div

2A/div

REVERSE CURRENT SINK AT INPUT TURN-ON

(V

IN

= 12V, V

OUT

= 1.5V, V

EXTERNAL

= 3.3V)

MAX5060 toc27

200µs/div

5A/div

Typical Operating Characteristics (continued)

(TA = +25°C, Figures 1 and 2, unless otherwise noted.)

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(TA = +25°C, Figures 1 and 2, unless otherwise noted.)

REVERSE CURRENT SINK AT ENABLE TURN-ON

(V

IN

= 12V, V

OUT

= 1.5V, V

EXTERNAL

= 2.0V)

MAX5060 toc28

200µs/div

2A/div

REVERSE CURRENT SINK AT ENABLE TURN-ON

(V

IN

= 12V, V

OUT

= 1.5V, V

EXTERNAL

= 3.3V)

MAX5060 toc29

200µs/div

5A/div

FREQUENCY vs. R

T

MAX5060 toc30

RT (kΩ)

f

SW

(kHz)

470

430

390

350

310

270

230

190

150

110

70

1000

10,000

100

30 510

VIN = 12V

FREQUENCY vs. TEMPERATURE

MAX5060 toc31

TEMPERATURE (°C)

f

SW

(kHz)

603510-15

242

244

246

248

250

252

254

256

258

260

240

-40 85

VIN = 12V

OUTPUT SHORT-CIRCUIT WAVEFORM

MAX5060 toc32

40ms/div

V

OUT

2V/div

V

IN

= 12V CEN = 0.47µF

V

OUT

= 3.3V R

LIM

= OPEN

EN
2V/div

I

OUT

10A/div

SYNC, CLKOUT, AND LX WAVEFORM

MAX5060 toc33

1µs/div

CLKOUT
5V/div

VIN = 12V
f

SW

= 250kHz

LX
10V/div

SYNC
5V/div

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,

Average-Current-Mode DC-DC Controllers

_______________________________________________________________________________________ 9

MAX5060/MAX5061

0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers

10 ______________________________________________________________________________________

Pin Description

PIN

MAX5060 MAX5061

1 3 PGND

2, 7 8 N.C. No Connection. Not internally connected.

3 4 DL Low-Side Gate-Driver Output. Synchronous MOSFET gate driver.

4 5 BST

NAME FUNCTION

Power Ground. Connect PGND, low-side synchronous MOSFET’s source, and

(MAX5060)/VCC (MAX5061) bypass capacitor returns together.

V

DD

Boost Flying-Capacitor Connection. Reservoir capacitor connection for the high­side MOSFET driver supply. Connect a 0.47µF ceramic capacitor between BST
and LX.

56 LX

6 7 DH High-Side Gate-Driver Output. Drives the gate of the high-side MOSFET.

8, 22, 25 16 SGND

9 — CLKOUT

10 — PGOOD

11 — EN

12 — RT/SYNC

13 — V_IOUT

14 10 LIM

15 — OVI

Inductor Connection. Source connection for the high-side MOSFETs. Also serves
as the return terminal for the high-side driver.

Signal Ground. Ground connection for the internal control circuitry. Connect
SGND and PGND together at one point near the input bypass capacitor return.

Oscillator Output. Rising edge of CLKOUT is phase-shifted from rising edge of
DH by 180°.

Power-Good Output. PGOOD is an open-drain output that goes low when the
programmed output voltage falls out of regulation. The power-good comparator
threshold is 90% of the programmed output voltage.

Output Enable. Drive EN high or leave unconnected for normal operation. Drive
EN low to shut down the power drivers. EN has an internal 15µA pullup current.
Connect a capacitor from EN to SGND to program the hiccup mode duty cycle.

Switching Frequency Programming and Chip-Enable Input. Connect a resistor
from RT/SYNC to SGND to set the internal oscillator frequency. Drive RT/SYNC
externally to synchronize the switching frequency with system clock.

Voltage-Source Output Proportional to the Output Load Current. The voltage at
V_IOUT is 135 x I

Current-Limit Setting Input. Connect a resistor from LIM to SGND to set the
hiccup current-limit threshold. Connect a capacitor from LIM to SGND to ignore
short output overcurrent pulses.

Overvoltage Protection Circuit Input. Connect OVI to DIFF. When OVI exceeds
+12.7% above the programmed output voltage, DH is latched low and DL is
latched high. Toggle EN low to high or recycle the power to reset the latch.

LOAD

x RS.

16 11 CLP

Current-Error-Amplifier Output. Compensate the current loop by connecting an
RC network to ground.