19-3175; Rev 1; 7/04
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
General Description
The MAX5069 is a high-frequency, current-mode,
pulse-width modulation (PWM) controller (with dual
MOSFET drivers) that integrates all the building blocks
necessary for implementing AC-DC or DC-DC fixed-fre-
quency power supplies. Isolated or nonisolated push-
pull and half/full-bridge power supplies are easily
constructed using either primary- or secondary-side
regulation. Current-mode control with leading-edge
blanking simplifies control-loop design and a program-
mable internal slope-compensation circuit stabilizes the
current loop when operating at duty cycles above 50%.
An input undervoltage lockout (UVLO) programs the
input-supply startup voltage and ensures proper opera-
tion during brownout conditions.
A single external resistor programs the oscillator frequen-
cy from 50kHz to 2.5MHz. The MAX5069A/D provide a
SYNC input for synchronization to an external clock. The
maximum FET-driver duty cycle for the MAX5069 is 50%.
Programmable dead time allows additional flexibility in
optimizing magnetic design and overcoming parasitic
effects. Programmable hiccup current limit provides
additional protection under severe faults.
The MAX5069 is specified over the -40°C to +125°C auto-
motive temperature range and is available in a
16-pin thermally enhanced TSSOP-EP package. Refer to
the MAX5068 data sheet for single FET-driver applications.
Warning:
The MAX5069 is designed to work with high
voltages. Exercise caution.
Features
♦
Current-Mode Control with 47µA (typ) Startup
Current
♦
Oscillator Frequency Programmable to 2.5MHz
♦
Resistor-Programmable ±4.5% Accurate
Switching Frequency
♦
Dual Gate-Drive Output for Half/Full-Bridge or
Push-Pull Applications
♦
Rectified 85VAC to 265VAC, or 36VDC to 72VDC
Input (MAX5069A/B)
♦
Input Directly Driven from 10.8V to 24V
(MAX5069C/D)
♦
Programmable Dead Time and Slope
Compensation
♦
Programmable Startup Voltage (UVLO)
♦
Programmable UVLO Hysteresis (MAX5069B/C)
♦
Frequency Synchronization Input (MAX5069A/D)
♦
-40°C to +125°C Automotive Temperature Range
♦
16-Pin Thermally Enhanced TSSOP-EP Package
MAX5069
Ordering Information
PART
MAX5069AAUE
MAX5069BAUE
MAX5069CAUE
MAX5069DAUE
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP-EP*
*EP
= Exposed pad.
Applications
Universal-Input AC Power Supplies
Isolated Telecom Power Supplies
Networking System Power Supplies
Server Power Supplies
Industrial Power Conversion
TOP VIEW
RT 1
SYNC(HYST*) 2
SCOMP 3
DT 4
UVLO/EN 5
FB 6
COMP 7
FLTINT 8
16 REG5
15 IN
14 V
CC
Pin Configuration
MAX5069
13 NDRVA
12 NDRVB
11 PGND
10 AGND
9
CS
TSSOP-EP
*MAX5069B/C.
Selector Guide 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.
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
MAX5069
ABSOLUTE MAXIMUM RATINGS
IN to PGND ............................................................-0.3V to +30V
IN to AGND.............................................................-0.3V to +30V
V
CC
to PGND..........................................................-0.3V to +13V
V
CC
to AGND..........................................................-0.3V to +13V
FB, COMP, CS, HYST, SYNC, REG5 to AGND ........-0.3V to +6V
UVLO/EN, RT, DT, SCOMP, FLTINT to AGND .........-0.3V to +6V
NDRVA, NDRVB to PGND ..........................-0.3V to (V
CC
+ 0.3V)
AGND to PGND .....................................................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TSSOP-EP (derate 21.3mW/°C above +70°C) ...1702mW
Operating Temperature Range..........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°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
IN
= +12V for the MAX5069C/D, V
IN
= +23.6V for the MAX5069A/B at startup, then reduces to +12V, C
IN
= C
REG5
= 0.1µF,
C
VCC
= 1µF, R
RT
= 100kΩ, NDRV_ = floating, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Bootstrap UVLO Wake-Up Level
Bootstrap UVLO Shutdown Level
UVLO/EN Wake-Up Threshold
UVLO/EN Shutdown Threshold
HYST FET On-Resistance
HYST FET Leakage Current
IN Supply Current In
Undervoltage Lockout
IN Range
V
CC
Regulator Set Point
REG5 Output Voltage
REG5 Short-Circuit Current Limit
IN Supply Current After Startup
Shutdown Supply Current
GATE DRIVER (NDRVA, NDRVB)
Driver Output Impedance
Driver Peak Output Current
PWM COMPARATOR
Comparator Offset Voltage
Comparator Propagation Delay
Minimum On-Time
CURRENT-LIMIT COMPARATOR
Current-Limit Trip Threshold
V
CS
298
314
330
mV
V
OS_PWM
t
PD_PWM
t
ON(MIN)
V
COMP
> V
CS
V
CS
= 0.1V
Includes t
CS_BLANK
1.30
1.60
40
110
2.00
V
ns
ns
Z
OUT(LOW)
NDRVA/NDRVB sinking 100mA
Sinking
Sourcing
2
3
1000
650
4
6
Z
OUT(HIGH)
NDRVA/NDRVB sourcing 25mA
I
NDRV
Ω
mA
SYMBOL
V
SUVR
V
SUVF
V
ULR2
V
ULF2
R
DS(ON)_H
I
LEAK_H
I
START
V
IN
V
CCSP
V
REG5
I
REG5_SC
I
IN
I
VIN_SD
V
IN
= +24V
f
SW
= 1.25MHz
f
SW
= 100kHz
V
IN
= +10.8V to +24V, V
CC
sourcing 1µA to 25mA
I
REG5
= 0 to 1mA
CONDITIONS
V
IN
rising, MAX5069A/B
V
IN
falling, MAX5069A/B
UVLO/EN rising
UVLO/EN falling
MAX5069B/C only, sinking 50mA,
V
UVLO/EN
= 0V
V
UVLO/EN
= 2V, V
HYST
= 5V
V
IN
= +19V, V
UVLO/EN
< V
ULF2
10.8
7.0
4.85
5.00
18
7
3
90
MIN
19.68
9.05
1.205
TYP
21.6
9.74
1.230
1.18
10
3
47
90
24.0
10.5
5.15
MAX
23.60
10.43
1.255
UNITS
V
V
V
V
Ω
nA
µA
V
V
V
mA
mA
µA
UNDERVOLTAGE LOCKOUT/STARTUP
INTERNAL SUPPLIES (V
CC
and REG5)
2
_______________________________________________________________________________________
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V for the MAX5069C/D, V
IN
= +23.6V for the MAX5069A/B at startup, then reduces to +12V, C
IN
= C
REG5
= 0.1µF,
C
VCC
= 1µF, R
RT
= 100kΩ, NDRV_ = floating, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
CS Input Bias Current
CS Blanking Time
Propagation Delay from
Comparator Input to NDRV_
IN CLAMP VOLTAGE
IN Clamp Voltage
ERROR AMPLIFIER (FB, COMP)
Voltage Gain
Unity-Gain Bandwidth
Phase Margin
FB Input Offset Voltage
COMP Clamp Voltage
Error-Amplifier Output Current
Reference Voltage
Input Bias Current
COMP Short-Circuit Current
THERMAL SHUTDOWN
Thermal-Shutdown Temperature
Thermal Hysteresis
SYNC High-Level Voltage
SYNC Low-Level Voltage
SYNC Input Bias Current
Maximum SYNC Frequency
SYNC High-Level Pulse Width
SYNC Low-Level Pulse Width
DIGITAL SOFT-START
Soft-Start Duration
Reference-Voltage Step
Reference-Voltage Steps During
Soft-Start
OSCILLATOR
Oscillator Frequency Range
f
OSC
f
OSC
= (10
11
/ R
RT
)
50
2500
kHz
t
SS
V
STEP
(Note 5)
2047
9.7
127
Cycles
mV
Steps
T
SD
T
HYST
V
IH_SYNC
V
IL_SYNC
I
B_SYNC
f
SYNC
t
SYNC_HI
t
SYNC_LO
f
OSC
= 2.5MHz (Note 4)
3.125
30
30
10
2.4
0.4
+170
25
°C
°C
V
V
nA
MHz
ns
ns
A
V
BW
PM
V
OS_FB
V
COMP
I
COMP
V
REF
I
B_EA
I
COMP_SC
High
Low
Sinking or sourcing
+25°C
≤
T
A
≤
+125°C (Note 3)
-40°C
≤
T
A
≤
+125°C (Note 3)
2.6
0.4
0.5
1.215
1.205
1.230
1.230
100
12
1.245
1.242
300
R
COMP
= 100kΩ to AGND
R
COMP
= 100kΩ to AGND,
C
LOAD
= 100pF to AGND
R
COMP
= 100kΩ to AGND,
C
LOAD
= 100pF to AGND
80
5
65
3
3.8
1.1
dB
MHz
Degrees
mV
V
mA
V
nA
mA
V
IN_CLAMP
IN sinking 2mA (Note 2)
24.0
26.0
29.0
V
SYMBOL
I
B_CL
t
CS_BLANK
t
PD_CL
50mV overdrive
V
CS
= 0V
CONDITIONS
MIN
0
70
40
TYP
MAX
+2
UNITS
µA
ns
ns
MAX5069
OSCILLATOR SYNC INPUT (MAX5069A/D only)
_______________________________________________________________________________________
3
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
MAX5069
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V for the MAX5069C/D, V
IN
= +23.6V for the MAX5069A/B at startup, then reduces to +12V, C
IN
= C
REG5
= 0.1µF,
C
VCC
= 1µF, R
RT
= 100kΩ, NDRV_ = floating, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
NDRV_ Switching Frequency
RT Voltage
SYMBOL
f
SW
V
RT
CONDITIONS
f
SW
= 10
11
/ (2 x R
RT
)
40kΩ < R
RT
< 500kΩ
T
A
= +25°C
Oscillator Accuracy
T
A
= -40°C to +125°C
Maximum Duty Cycle
DEAD-TIME CONTROL (DT)
Dead Time
Dead-Time Disable Voltage
Dead-Time Regulation Voltage
FLTINT Source Current
FLTINT Shutdown Threshold
FLTINT Restart Threshold
SLOPE COMPENSATION
Slope Compensation
Slope-Compensation Range
Slope-Compensation Voltage
Range
V
SLOPE
V
SLOPER
V
SCOMP
C
SLOPE
= 100pf, RT = 110kΩ
0
0
15
90
2.7
mV/µs
mV/µs
V
t
DT
V
DT_DISABLE
V
DT
I
FLTINT
V
FLTINT_SD
V
FLTINT_RS
V
FLTINT
= 0V
V
FLTINT
rising
V
FLTINT
falling
R
DT
= 24.9kΩ
V
REG5
-
0.5V
1.23
60
2.8
1.6
60
ns
V
V
µA
V
V
D
MAX
DT connected to REG5
f
OSC
≤
500kHz
f
OSC
> 500kHz
f
OSC
≤
500kHz
f
OSC
> 500kHz
-2.5
-4
-4.5
-6
100
MIN
25
2.0
+2.5
+4
+4.5
+6
%
%
TYP
MAX
1250
UNITS
kHz
V
INTEGRATING FAULT PROTECTION (FLTINT)
Note 1:
The MAX5069 is 100% tested at T
A
= +25°C. All limits over temperature are guaranteed by design.
Note 2:
The MAX5069A/B are intended for use in universal-input power supplies. The internal clamp circuit is used to prevent the
bootstrap capacitor (C1 in
Figure
1) from charging to a voltage beyond the absolute maximum rating of the device when
UVLO/EN is low. The maximum current to V
IN
(hence to clamp) when UVLO is low (device is in shutdown) must be external-
ly limited to 2mA. Clamp currents higher than 2mA may result in clamp voltages higher than 30V, thus exceeding the
absolute maximum rating for V
IN
. For the MAX5069C/D, do not exceed the 24V maximum operating voltage of the device.
Note 3:
Reference voltage (V
REF
) is measured with FB connected to COMP (see the
Functional Diagram).
Note 4:
The SYNC frequency must be at least 25% higher than the programmed oscillator frequency.
Note 5:
The internal oscillator clock cycle.
4
_______________________________________________________________________________________
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
MAX5069
Typical Operating Characteristics
(V
IN
= +23.6V for MAX5069A/B at startup, then reduces to +12V, V
IN
= +12V for the MAX5069C/D, C
IN
= C
REG5
= 0.1µF, C
VCC
= 1µF,
R
RT
= 100kΩ, NDRV_ = floating, V
FB
= 0V, V
COMP
= floating, V
CS
= 0V, T
A
= +25°C, unless otherwise noted.)
BOOTSTRAP UVLO WAKE-UP LEVEL
vs. TEMPERATURE
MAX5069 toc01
BOOTSTRAP UVLO SHUTDOWN LEVEL
vs. TEMPERATURE
MAX5069 toc02
UVLO/EN WAKE-UP THRESHOLD
vs. TEMPERATURE
UVLO/EN RISING
MAX5069 toc03
21.6
21.5
21.4
21.3
21.2
21.1
21.0
MAX5069A/B
10.0
MAX5069A/B
1.245
9.9
1.240
9.7
UVLO/EN (V)
-40
-15
10
35
60
85
110
9.8
V
IN
(V)
V
IN
(V)
1.235
1.230
9.6
1.225
9.5
-40
-15
10
35
60
85
110
TEMPERATURE (
°
C)
TEMPERATURE (
°
C)
1.220
-40
-15
10
35
60
85
110
TEMPERATURE (
°
C)
UVLO/EN SHUTDOWN THRESHOLD
vs. TEMPERATURE
MAX5069 toc04
V
IN
SUPPLY CURRENT IN UNDERVOLTAGE
LOCKOUT vs. TEMPERATURE
MAX5069 toc05
VIN SUPPLY CURRENT AFTER STARTUP
vs. TEMPERATURE
V
IN
= 24V
7
6
f
SW
= 500kHz
f
SW
= 250kHz
f
SW
= 1.25MHz
MAX5069 toc06
MAX5069 toc09
1.20
1.19
1.18
1.17
UVLO/EN (V)
UVLO/EN FALLING
60
56
V
IN
= 19V
WHEN IN BOOTSTRAP UVLO (MAX5069A/B)
UVLO/EN (MAX5069C/D) IS LOW
8
I
START
(µA)
I
IN
(mA)
1.16
1.15
1.14
1.13
1.12
1.11
1.10
-40
-15
10
35
60
85
110
TEMPERATURE (
°
C)
52
5
4
3
48
44
2
f
SW
= 50kHz
40
-40
-15
10
35
60
85
110
TEMPERATURE (
°
C)
1
-40
-15
10
35
60
85
110
TEMPERATURE (°C)
f
SW
= 100kHz
V
CC
vs. TEMPERATURE
MAX5069 toc07
REG5 OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX5069 toc08
REG5 vs. TEMPERATURE
5.00
4.99
4.98
4.97
4.96
REG5 (V)
1mA LOAD
V
IN
= 10.8V
100µA LOAD
10.0
9.7
9.4
9.1
V
IN
= 19V, I
IN
= 25mA
V
IN
= 19V, I
IN
= 10mA
4.980
R
RT
= 100kΩ
4.975
4.970
REG5 (V)
4.965
4.960
V
CC
(V)
8.8
8.5
8.2
7.9
7.6
7.3
7.0
-40
-15
10
35
60
85
110
TEMPERATURE (°C)
V
IN
= 10.8V, I
IN
= 25mA
V
IN
= 10.8V, I
IN
= 10mA
4.95
4.94
4.93
4.92
4.91
4.955
4.950
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT CURRENT (mA)
4.90
-40
-15
10
35
60
85
110
TEMPERATURE (
°
C)
_______________________________________________________________________________________
5
Microcontroller MCU
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