19-3045; Rev 0; 10/03
EVALUATION KIT
AVAILABLE
Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
General Description
The MAX5058/MAX5059 enable secondary-side syn-
chronous rectification in isolated power supplies using
widely available power MOSFETs. These devices facili-
tate 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 com-
plement the MAX5051 and MAX5042/MAX5043 primary-
side 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 ref-
erence output enables virtually unlimited possibilities in
reference-voltage generation. Reference voltage for the
error amplifier is generated by connecting an appropri-
ate resistor to this output.
Low on-resistance margining MOSFETs integrated on-
chip allow for implementation of a margining circuit
without the use of external switches. The MAX5058 pro-
vides a 5V LDO output for logic-level MOSFETs while
the MAX5059 provides a 10V LDO output for conven-
tional 10V MOSFETs.
The MAX5058/MAX5059 are designed to enable paral-
leling 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 high-
output-current applications. When used in conjunction
with the MAX5051, the primaries can also be synchro-
nized and operated 180 degrees out of phase.
The MAX5058/MAX5059 are available in a 28-pin ther-
mally 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.
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
Ordering Information
PART
MAX5058AUI
MAX5058EUI
MAX5059AUI
MAX5059EUI
TEMP RANGE
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
PIN-
PACKAGE
28 TSSOP-EP*
28 TSSOP-EP*
28 TSSOP-EP*
28 TSSOP-EP*
V
REG
(V)
5
5
10
10
Applications
Isolated Telecom Power Supplies
Isolated Networking Power Supplies
±48V
Power-Supply Modules
Industrial Power Supplies
±48V/±12V
Server Power Supplies
*EP
= Exposed paddle.
Pin Configuration appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
MAX5058/MAX5059
ABSOLUTE MAXIMUM RATINGS
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)
V
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
A
= +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
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.
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
=
V
VSP
= 1.785V, C
VREG
= 2.2µF, C
VP
= 1µF, C
COMPS
= 0.1µF, C
SFP
= 68nF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25°C.)
PARAMETER
POWER SUPPLY
Supply Voltage Range
Quiescent Supply Current
Switching Supply Current
V+
I
Q
I
SW
f
SW
= 250kHz at BUFIN
MAX5058
MAX5059
49.2
-0.1
0.5
MAX5058
MAX5059
4.5
9.3
2.5
4.5
6
50
51.1
+0.1
2.5
28.0
28.0
5
mA
mA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
REF
: REFERENCE CURRENT OUTPUT
Reference Current
Reference Current Variation
Reference Voltage Compliance
Range
V
REG
: LOW-DROPOUT REGULATOR
Regulator Output
Line Regulation
V
VREG
I
VREG
= 0 to 30mA
MAX5058, V+ = 6V to 28V
MAX5059, V+ = 11V to 28V
MAX5058
Dropout
V
DROP
MAX5059
VP: INTERNAL REGULATOR
Regulator Output Setpoint
ZC: ZERO-CURRENT COMPARATOR
Zero-Current Comparator
Threshold
Zero-Current Comparator Input
Current
V
ZCTH
I
ZC
T
A
= +25°C
+3.5
-2.5
+5
+6.5
+2.5
mV
µA
V
VP
I
VP
= 0 to 5mA
3.8
4.3
V
V+ = 4.5V,
I
VREG
= 30mA
V+ = 9.3V,
I
VREG
= 30mA
200
200
MAX5058
MAX5059
4.75
9.4
5
10
5.25
10.6
25
25
350
mV
350
V
mV
I
IREF
ΔI
IREF
V
IREF
= 1.785V
V
IREF
= 0.5V to 2.5V
Guaranteed by reference current variation
test
µA
%/V
V
2
_______________________________________________________________________________________
Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
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
=
V
VSP
= 1.785V, C
VREG
= 2.2µF, C
VP
= 1µF, C
COMPS
= 0.1µF, C
SFP
= 68nF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25°C.)
PARAMETER
Zero-Current Comparator Input
Range
Zero-Current Comparator
Propagation Delay
SYMBOL
V
ZC
10mV overdrive, from when V
ZCP
- V
ZCN
is
greater than V
ZCTH
to when QSYNC goes
low
CONDITIONS
MIN
-0.1
TYP
MAX
+1.5
UNITS
V
MAX5058/MAX5059
t
ZC
65
ns
BUFIN: SYNCHRONIZING PULSE INPUT
BUFIN to Output Propagation
Delay
BUFIN Input Current
BUFIN Input Capacitance
BUFIN Input-Logic High
BUFIN Input-Logic Low
MARGINING INPUTS
RMGD Resistance
RMGU Resistance
MRGD Input-Logic High
MRGD Input-Logic Low
MRGU Input-Logic High
MRGU Input-Logic Low
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
I
QREC_SO,
I
QSYNC_SO
V
QREC_H,
V
QSYNC_H
t
PDLH
I
QREC_SI,
I
QSYNC_SI
V
QREC_L,
V
QSYNC_L
t
PDHL
Sinking 50mA
C
QREC
= C
QSYNC
= 0
C
QREC
= C
QSYNC
= 5nF
MAX5058
MAX5059
Measured with respect to
V
VDR
, sourcing 50mA
C
QREC
= C
QSYNC
= 0
C
QREC
= C
QSYNC
= 5nF
MAX5058
MAX5059
2
75
75
30
70
2
50
50
40
70
100
100
150
150
mV
A
R
RMGD
R
RMGU
V
HMRGD
V
LMRGD
V
HMRGU
V
LMRGU
R
MRGD
,
R
MRGU
I
RMGU
,
I
RMGD
40
-100
+100
2.4
0.8
Sinking 10mA
Sinking 10mA
2.4
0.8
6.5
6.5
11
11
Ω
Ω
V
V
V
V
kΩ
nA
t
pd
I
BUFIN
C
BUFIN
V
HBUFIN
V
LBUFIN
2.4
0.8
BUFIN rising to QREC rising or QSYNC
falling
-1
10
40
+1
ns
µA
pF
V
V
ns
A
mV
ns
_______________________________________________________________________________________
3
Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
MAX5058/MAX5059
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
=
V
VSP
= 1.785V, C
VREG
= 2.2µF, C
VP
= 1µF, C
COMPS
= 0.1µF, C
SFP
= 68nF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25°C.)
PARAMETER
ERROR AMPLIFIER
Inverting Input Current
Error-Amplifier Input Range
Error-Amplifier Input Offset
Error-Amplifier Output-Voltage
Low
Error-Amplifier Unity-Gain BW
Error-Amplifier Voltage Gain
Error-Amplifier PSRR
COMPV Output Resistance to
Ground
REMOTE-SENSE AMPLIFIER (RSA)
VSN Input Current
VSP Input Current
Input Common-Mode Range
Input Offset Voltage
Output Impedance
Amplifier -3dB Frequency
Remote-Sense Amplifier Gain
CURRENT-SENSE AMPLIFIER (CSA)
CSN Input Current
CSP Input Current
Input Offset Voltage
Current-Sense Amplifier Gain
Input Differential-Mode Range
Input Common-Mode Range
Output-Voltage Level Shift
Output Voltage Range
Amplifier -3dB Frequency
SHARE-FORCE AMPLIFIER (SFA)
Sink Current
Source Current
500
60
µA
µA
V
LS
V
CSO(MIN)
f
-3dB
(Note 2)
I
CSO
= -500µA to +500µA
I
CSO
= -500µA to +500µA
-0.3
0.415
0.1
50
G
CSA
I
CSN
I
CSP
-0.3V
≤
V
CSN
≤
+3.8V,
-0.3V
≤
V
CSP
≤
+3.8V
-0.3V
≤
V
CSP
≤
+3.8V
I
CSO
= -500µA to +500µA (Note 2)
I
CSO
= -500µA to +500µA
-150
-40
+20
19.8
+25
20
+150
+150
+30
20.2
100
+3.8
0.570
3.0
µA
µA
mV
V/V
mV
V
V
V
kHz
G
RS
I
VSO
= -0.5mA to +0.5mA
I
VSO
= -0.5mA to +0.5mA
0.9925
V
OSRSA
I
VSO
= -0.5mA to +0.5mA
I
VSN
I
VSP
-100
-20
-0.3
-4
8
1
1
1.0075
+100
+100
+3.8
µA
µA
V
mV
Ω
MHz
V/V
I
INV
V
INV
V
OS
V
COMPV
GBW
A
VOL
PSRR
(Note 1)
I
COMPV
= 100µA to 5mA
I
COMPV
= 5mA
R
COMP
= 220Ω, I
COMP
= 5mA
R
COMPV
= 220Ω, I
COMP
= 5mA
1.3
80
60
1
-50
0
-5
+50
2.5
+5
200
nA
V
mV
mV
MHz
dB
dB
MΩ
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
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
=
V
VSP
= 1.785V, C
VREG
= 2.2µF, C
VP
= 1µF, C
COMPS
= 0.1µF, C
SFP
= 68nF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25°C.)
PARAMETER
Transconductance
Common-Mode Input Voltage
Range
Output Voltage Range
Offset Voltage
Open-Loop Gain
CURRENT-ADJUST VOLTAGE-TO-CURRENT CONVERTER
Input Voltage Range
Input Voltage Offset
Output Voltage Range
Transconductance
Maximum Current Adjustment
Value
THERMAL SHUTDOWN
Thermal Warning Flag Level
Thermal Warning Flag Hysteresis
Internal Thermal-Shutdown Level
Internal Thermal-Shutdown
Hysteresis
TSF Maximum Output Voltage
TSF Output Leakage Current
I
TSF
= 5mA
When TSF pulls low
+125
15
+160
15
120
0.1
°C
°C
°C
°C
mV
µA
1.38
0.5
1.15
1.5
1.66
0.75
1.25
2.5
2.75
V
V
V
µA/V
µA
T
A
= +25°C
0.45
0.85
20
42
72
SYMBOL
CONDITIONS
MIN
TYP
500
2.55
2.75
65
MAX
UNITS
µA/V
V
V
mV
dB
MAX5058/MAX5059
CURRENT-ADJUST AMPLIFIER (CAA)
Note 1:
Output resistance to ground used for unity-gain stability.
Note 2:
V
CSO
= G
CSA
(V
CSP
- V
CSN
) + V
LS
.
_______________________________________________________________________________________
5
