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MAX5094BAUA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
General Description
The MAX5094A/B/C/D/MAX5095A/B/C BiCMOS, high-
performance, current-mode PWM controllers have all the
features required for wide input-voltage range
isolated/nonisolated power supplies. These controllers
are used for low- and high-power universal input volt-
age and telecom power supplies.
The MAX5094/MAX5095 contain a fast comparator with
only 60ns typical delay from current sense to the output
for overcurrent protection. The MAX5094 has an inte-
grated error amplifier with the output at COMP. Soft-
start is achieved by controlling the COMP voltage rise
using external components.
The oscillator frequency is adjustable from 20kHz to
1MHz with an external resistor and capacitor. The tim-
ing capacitor discharge current is trimmed allowing for
programmable dead time and maximum duty cycle for
a given frequency. The available saw-toothed waveform
at R
T
C
T
can be used for slope compensation when
needed.
The MAX5095A/MAX5095B include a bidirectional syn-
chronization circuit allowing for multiple controllers to
run at the same frequency to avoid beat frequencies.
Synchronization is accomplished by simply connecting
the SYNC of all devices together. When synchronizing
with other devices, the MAX5095A/MAX5095B with the
highest frequency synchronizes the other devices.
Alternatively, the MAX5095A/MAX5095B can be syn-
chronized to an external clock with an open-drain out-
put stage running at a higher frequency.
The MAX5095C provides a clock output pulse
(ADV_CLK) that leads the driver output (OUT) by
110ns. The advanced clock signal is used to drive the
secondary-side synchronous rectifiers.
The MAX5094A/B/C are available in the 8-pin SO and
8-pin µMAX
®
packages. The MAX5094D and
MAX5095A/B/C are available in the 8-pin µMAX pack-
age. All devices operate over the automotive tempera-
ture range of -40°C to +125°C.
Applications
Universal Input AC/DC Power Supplies
Isolated Telecom Power Supplies
Isolated Power-Supply Modules
Networking Systems
Computer Systems/Servers
Industrial Power Conversion
Isolated Keep-Alive Circuits
Features
♦ Pin-for-Pin Replacement for UCC28C43
(MAX5094A) and UCC28C45 (MAX5094B)
♦ 2A Drive Source and 1A Sink Capability
♦ Up to 1MHz Switching Frequency Operation
♦ Bidirectional Frequency Synchronization
(MAX5095A/MAX5095B)
♦ Advanced Output Drive for Secondary-Side
Synchronous Rectification (MAX5095C)
♦ Fast 60ns Cycle-by-Cycle Current Limit
♦ Trimmed Oscillator Capacitor Discharge Current
Sets Maximum Duty Cycle Accurately
♦ Accurate ±5% Start Voltage with 0.8V Hysteresis
♦ Low 32µA Startup Current
♦ 5V Regulator Output (REF) with 20mA Capability
♦ Versions with 0.3V Current-Sense Threshold
♦ Overtemperature Shutdown
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
________________________________________________________________ Maxim Integrated Products 1
OUT
GNDR
T
/C
T
1
2
8
7
REF
V
CC
FB
CS
COMP
µMAX/SO
TOP VIEW
3
4
6
5
MAX5094
Pin Configurations
Ordering Information
19-3864; Rev 3; 10/06
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.
PART TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX5094AASA
-40°C to +125°C
8 SO S8-4
MAX5094AASA+
-40°C to +125°C
8 SO S8-4
MAX5094AAUA*
-40°C to +125°C
8 µMAX
U8-1
MAX5094AAUA+
-40°C to +125°C
8 µMAX
U8-1
MAX5094BASA*
-40°C to +125°C
8 SO S8-4
MAX5094BASA+
-40°C to +125°C
8 SO S8-4
MAX5094BAUA*
-40°C to +125°C
8 µMAX
U8-1
MAX5094BAUA+
-40°C to +125°C
8 µMAX
U8-1
Pin Configurations continued at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
+Denotes lead-free package.
*Future product—contact factory for availability.
Ordering Information continued at end of data sheet.
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +15V, R
T
= 10kΩ, C
T
= 3.3nF, REF = open, C
REF
= 0.1µF, COMP = open, V
FB
= 2V, CS = GND, T
A
= T
J
= -40°C to +85°C,
unless otherwise noted.) (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.
V
CC
(Low-Impedance Source) to GND ..................-0.3V to +30V
V
CC
(I
CC
< 30mA).....................................................Self Limiting
OUT to GND ...............................................-0.3V to (V
CC
+ 0.3V)
OUT Current.............................................................±1A for 10µs
FB, SYNC, COMP, CS, R
T
/C
T
, REF to GND .............-0.3V to +6V
COMP Sink Current (MAX5094)..........................................10mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
8-Pin SO (derate 5.9mW/°C above +70°C)...............470.6mW
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
REFERENCE
Output Voltage V
REF
T
A
= +25°C, I
REF
= 1mA
4.950 5.000 5.050
V
Line Regulation ∆V
LINE
12V ≤ V
CC
≤ 25V, I
REF
= 1mA 0.4 4 mV
Load Regulation ∆V
LOAD
1mA ≤ I
REF
≤ 20mA 6 25 mV
Total Output Variation V
REFT
1mA ≤ I
REF
≤ 20mA, 12V ≤ V
CC
≤ 25V 4.9 5.1 V
V
NOISE
10Hz ≤ f ≤ 10kHz, T
A
= +25°C 50 µV
Reference Output Short Circuit I
S_SC
V
REF
=
0V -30
-100 -180
mA
OSCILLATOR
Initial Accuracy T
A
= +25°C 51 54 57 kHz
Voltage Stability 12V ≤ V
CC
≤ 25V 0.2 0.5 %
Temp Stability -40°C ≤ T
A
≤ +85°C 0.5 %
R
T
/C
T
Voltage Ramp (
P-P
)V
RAMP
1.7 V
R
T
/C
T
Voltage Ramp Valley
V
RAMP_VALLEY
1.1 V
V
RT/CT
= 2V, T
A
= +25°C 7.9 8.3 8.7
Discharge Current I
DIS
V
RT/CT
= 2V, -40°C ≤ T
A
≤ +85°C 7.5 8.3 9.0
mA
Frequency Range f
OSC
20
1000
kHz
ERROR AMPLIFIER (MAX5094)
FB Input Voltage V
FB
FB shorted to COMP
2.465
2.5
2.535
V
FB Input Bias Current I
B(FB)
-0.01 -0.1
µA
Open-Loop Voltage Gain A
VOL
2V ≤ V
COMP
≤ 4V
100
dB
Unity-Gain Bandwidth f
GBW
1
MHz
Power-Supply Rejection Ratio PSRR 12V ≤ V
CC
≤ 25V (Note 2) 60 80 dB
COMP Sink Current I
SINK
V
FB
= 2.7V, V
COMP
= 1.1V 2 6 mA
COMP Source Current I
SOURCE
V
FB
= 2.3V, V
COMP
= 5V
-0.5 -1.2 -1.8
mA
COMP Output High Voltage V
COMPH
V
FB
= 2.3V, R
COMP
= 15kΩ to GND 5 5.8 V
COMP Output Low Voltage V
COMPL
V
FB
= 2.7V, R
COMP
= 15kΩ to REF 0.1 1.1 V
CURRENT-SENSE AMPLIFIER
(MAX5094A/MAX5094B)
2.85
3
3.26
V/V
Gain (Notes 3, 4) A
CS
(MAX5094C/D, MAX5095_)
2.85
3
3.40
V/V
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +15V, R
T
= 10kΩ, C
T
= 3.3nF, REF = open, C
REF
= 0.1µF, COMP = open, V
FB
= 2V, CS = GND, T
A
= T
J
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
MAX5094A/B (Note 3)
0.95
1
1.05
MAX5094C/MAX5094D (Note 3)
0.275
0.3
0.325
Maximum Current-Sense Signal V
CS_MAX
V
COMP
= 5V, MAX5095
0.275
0.3
0.325
V
Power-Supply Rejection Ratio PSRR 12V ≤ V
CC
≤ 25V 70 dB
Input Bias Current I
CS
V
COMP
= 0V -1
-2.5
µA
Delay From CS to OUT
t
CS_DELAY
50mV overdrive 60 ns
MOSFET DRIVER
OUT Low-Side On-Resistance
V
RDS_ONL
I
SINK
= 200mA 4.5 10 Ω
OUT High-Side On-Resistance
V
RDS_ONH
I
SOURCE
= 100mA 3.5 7 Ω
I
SOURCE
(Peak) I
SOURCE
C
OUT
= 10nF 2 A
I
SINK
(Peak) I
SINK
C
OUT
= 10nF 1 A
Rise Time t
R
C
OUT
= 1nF 15 ns
Fall Time t
F
C
OUT
= 1nF 22 ns
UNDERVOLTAGE LOCKOUT/STARTUP
Startup Voltage Threshold
V
CC_START
7.98 8.40 8.82
V
Minimum Operating Voltage After
Turn-On
V
CC_MIN
7.1 7.6 8.0 V
Undervoltage-Lockout Hysteresis
UVLO
HYST
0.8 V
PWM
MAX5094A/MAX5094C/MAX5095A
94.5
96
97.5
Maximum Duty Cycle D
MAX MAX5094B/MAX5094D/MAX5095B/
MAX5095C
48
49.8
50
%
Minimum Duty Cycle D
MIN
0%
SUPPLY CURRENT
Startup Supply Current I
START
V
CC
= 7.5V 32 65 µA
Operating Supply Current I
CC
V
FB
= V
CS
= 0V 3 5 mA
Zener Bias Voltage at V
CC
V
Z
I
CC
= 25mA 24
26.5
V
THERMAL SHUTDOWN
Thermal Shutdown T
SHDN
Junction temperature rising
150
°C
Thermal Shutdown Hysteresis T
HYST
4°C
SYNCHRONIZATION (MAX5095A/MAX5095B Only) (Note 5)
SYNC Frequency Range f
SYNC
20
1000
kHz
SYNC Clock Input High
Threshold
V
SYNCINH
3.5 V
SYNC Clock Input Low Threshold
V
SYNCINL
0.8 V
SYNC Clock Input Minimum
Pulse Width
t
PW_SYNCIN
200
ns
SYNC Clock Output High Level V
SYNCOH
1mA external pulldown 4.0 4.7 V
SYNC Clock Output Low Level V
SYNCOL
R
SYNC
= 5kΩ 0 0.1 V
SYNC Leakage Current I
SYNC
V
SYNC
= 0V
0.01
0.1 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

MAX5094BAUA+

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Manufacturer:
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Description:
Switching Controllers Single-Ended
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