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MAX5068CAUE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
General Description
The MAX5068 is a high-frequency, current-mode,
pulse-width modulation (PWM) controller that integrates
all the building blocks necessary for implementing AC-
DC or DC-DC fixed-frequency power supplies. Isolated
or nonisolated power supplies are easily constructed
using either primary- or secondary-side regulation.
Current-mode control with leading-edge blanking sim-
plifies control-loop design, and a programmable inter-
nal slope-compensation circuit stabilizes the current
loop when operating at duty cycles above 50%. The
MAX5068A/B limit the maximum duty cycle to 50% for
use in single-ended forward converters. The
MAX5068C/D/E/F allow duty cycles up to 75%. The
MAX5068 features an accurate externally programma-
ble oscillator that simplifies system design.
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 output switching
frequency from 12.5kHz to 1.25MHz. The MAX5068A/
B/C/E provide a SYNC input for synchronization to an
external clock. The maximum FET-driver duty cycle is
50% for the MAX5068A/B and 75% for the MAX5068C/
D/E/F. Programmable hiccup current limit provides
additional protection under severe faults.
The MAX5068 is specified over the -40°C to +125°C
automotive temperature range and is available in a
16-pin thermally enhanced TSSOP-EP package. Refer to
the MAX5069 data sheet for dual FET-driver applications.
Warning: The MAX5068 is designed to work with high
voltages. Exercise caution.
Applications
Universal-Input AC Power Supplies
Isolated Telecom Power Supplies
Networking System Power Supplies
Server Power Supplies
Industrial Power Conversion
Features
♦ Current-Mode Control with 47µA (typ) Startup
Current
♦ Resistor-Programmable ±4.5% Accurate
Switching Frequency:
25kHz to 1.25MHz (MAX5068A/B)
12.5kHz to 625kHz (MAX5068C/D/E/F)
♦ Rectified 85V
AC
to 265V
AC
or 36V
DC
to 72V
DC
Input (MAX5068A/C/D)
♦ Input Directly Driven from 10.8V to 24V
(MAX5068B/E/F)
♦ Frequency Synchronization Input
(MAX5068A/B/C/E)
♦ Programmable Dead Time and Slope
Compensation
♦ Programmable Startup Voltage (UVLO)
♦ Programmable UVLO Hysteresis
(MAX5068A/B/D/F)
♦ Integrating Fault Protection (Hiccup)
♦ -40°C to +125°C Automotive Temperature Range
♦ 16-Pin Thermally Enhanced TSSOP-EP Package
MAX5068
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
________________________________________________________________ Maxim Integrated Products 1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
RT
REG5
IN
V
CC
NDRV
AGND
PGND
AGND
CS
TOP VIEW
MAX5068A/B
TSSOP-EP
SYNC
HYST
FB
DT
UVLO/EN
COMP
FLTINT
Pin Configurations
Ordering Information
19-3176; Rev 1; 7/04
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.
*EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
MAX5068AAUE -40°C to +125°C 16 TSSOP-EP*
MAX5068BAUE -40°C to +125°C 16 TSSOP-EP*
MAX5068CAUE -40°C to +125°C 16 TSSOP-EP*
MAX5068DAUE -40°C to +125°C 16 TSSOP-EP*
MAX5068EAUE -40°C to +125°C 16 TSSOP-EP*
MAX5068FAUE -40°C to +125°C 16 TSSOP-EP*
Pin Configurations continued at end of data sheet.
Selector Guide appears at end of data sheet.
MAX5068
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +12V for the MAX5068B/E/F; V
IN
= +23.6V for the MAX5068A/C/D 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)
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 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
NDRV to PGND...........................................-0.3V to (V
CC
+ 0.3V)
AGND to PGND .....................................................-0.3V to +0.3V
Continuous Power Dissipation
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
UNDERVOLTAGE LOCKOUT/STARTUP
Bootstrap UVLO Wake-Up Level V
SUVR
V
IN
rising, MAX5068A/C/D only 19.68 21.6 23.60 V
Bootstrap UVLO Shutdown Level V
SUVF
V
IN
falling, MAX5068A/C/D only 9.05 9.74 10.43 V
UVLO/EN Wake-Up Threshold V
ULR2
V
UVLO/EN
rising 1.205 1.230 1.255 V
UVLO/EN Shutdown Threshold V
ULF2
V
UVLO/EN
falling 1.18 V
HYST FET On-Resistance R
D S
(
ON
)
_H
MAX5068A/B/D/F only, sinking 50mA,
V
UVLO/EN
= 0V
10 Ω
HYST FET Leakage Current I
LEAK_H
V
UVLO/EN
= 2V, V
HYST
= 5V 3 nA
IN Supply Current In
Undervoltage Lockout
I
START
V
IN
= +19V, V
UVLO/EN
< V
ULF2
47 90 µA
IN Range V
IN
10.8 24.0 V
INTERNAL SUPPLIES (V
CC
and REG5)
V
CC
Regulator Set Point V
CCSP
V
IN
= + 10.8V to + 24V , V
C C
sour ci ng 1µA to 25m A 7.0 10.5 V
REG5 Output Voltage V
REG5
I
REG5
= 0 to 1mA 4.85 5.00 5.15 V
REG5 Short-Circuit Current Limit I
REG5_SC
18 mA
f
SW
= 1.25MHz 5
IN Supply Current After Startup I
IN
V
IN
= +24V
f
SW
= 100kHz 2.5
mA
Shutdown Supply Current I
IN_SD
90 µA
GATE DRIVER (NDRV)
Z
OUT
(
LOW
)
NDRV sinking 100mA 2 4
Driver Output Impedance
Z
OUT
(
HIGH
)
NDRV sourcing 25mA 3 6
Ω
Sinking 1000
Driver Peak Output Current I
NDRV
Sourcing 650
mA
PWM COMPARATOR
Comparator Offset Voltage V
OS_PWM
V
COMP
- V
CS
1.30 1.60 2.00 V
Comparator Propagation Delay t
PD_PWM
V
CS
= 0.1V 40 ns
Minimum On-Time t
ON
(
MIN
)
Includes t
CS_BLANK
110 ns
CURRENT-LIMIT COMPARATOR
Current-Limit Trip Threshold V
CS
298 314 330 mV
MAX5068
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CS Input Bias Current I
B_CS
V
CS
= 0V 0 +2 µA
CS Blanking Time t
CS_BLANK
70 ns
Propagation Delay from
Comparator Input to NDRV
50mV overdrive 40 ns
IN CLAMP VOLTAGE
IN Clamp Voltage V
IN_CLAMP
V
IN
sinking 2mA (Note 2) 24.0 26.0 29.0 V
ERROR AMPLIFIER (FB, COMP)
Voltage Gain A
V
R
COMP
= 100kΩ to AGND 80 dB
Unity-Gain Bandwidth BW
R
COMP
= 100kΩ to AGND,
C
LOAD
= 100pF to AGND
5 MHz
Phase Margin PM
R
COMP
= 100kΩ to AGND,
C
LOAD
= 100pF to AGND
65 degrees
FB Input Offset Voltage V
OS_FB
3mV
High 2.6 3.8
COMP Clamp Voltage V
COMP
Low 0.4 1.1
V
Error-Amplifier Output Current I
COMP
Sinking or sourcing 0.5 mA
+25°C ≤ T
A
≤ +125°C (Note 3) 1.215 1.230 1.245
Reference Voltage V
REF
-40°C ≤ T
A
≤ +125°C 1.205 1.230 1.242
V
Input Bias Current I
B_EA
100 300 nA
COMP Short-Circuit Current I
COMP_SC
12 mA
THERMAL SHUTDOWN
Thermal-Shutdown Temperature T
SD
+170 °C
Thermal Hysteresis T
HYST
+25 °C
OSCILLATOR SYNC INPUT (MAX5068A/B/C/E Only)
SYNC High-Level Voltage V
IH_SYNC
2.4 V
SYNC Low-Level Voltage V
IL_SYNC
0.4 V
SYNC Input Bias Current I
B_SYNC
10 nA
Maximum SYNC Frequency f
SYNC
f
OSC
= 2.5MHz (Note 4) 3.125 MHz
SYNC High-Level Pulse Width t
SYNC_HI
30 ns
SYNC Low-Level Pulse Width t
SYNC_LO
30 ns
DIGITAL SOFT-START
Soft-Start Duration t
SS
(Note 5) 2047 cycles
Reference-Voltage Step V
STEP
9.7 mV
Reference-Voltage Steps During
Soft-Start
127 steps
OSCILLATOR
Internal Oscillator Frequency
Range
f
OSC
f
OSC
= (10
11
/ R
RT
) 50 2500 kHz
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V for the MAX5068B/E/F; V
IN
= +23.6V for the MAX5068A/C/D 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)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX5068CAUE+T

Mfr. #:
Buy MAX5068CAUE+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers High-Frequency Current-Mode PWM
Lifecycle:
New from this manufacturer.
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