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MAX5070AASAMAXIMN/a34avai5 V, high-performance, single-ended, current-mode PWM controller
MAX5070AAUAMAXIMN/a39avai5 V, high-performance, single-ended, current-mode PWM controller
MAX5070AAUAMAXN/a30avai5 V, high-performance, single-ended, current-mode PWM controller
MAX5070AAUAMAXIM ?N/a39avai5 V, high-performance, single-ended, current-mode PWM controller
MAX5070BASAMAXIMN/a2500avai5 V, high-performance, single-ended, current-mode PWM controller
MAX5070BAUAMAXIM ?N/a100avai5 V, high-performance, single-ended, current-mode PWM controller
MAX5071BAUAMAXIMN/a13avai5 V, high-performance, single-ended, current-mode PWM controller


MAX5070BASA ,5 V, high-performance, single-ended, current-mode PWM controllerELECTRICAL CHARACTERISTICS(V = +15V, R = 10kΩ, C = 3.3nF, V = OPEN, C = 0.1µF, COMP = OPEN, V = 2V, ..
MAX5070BAUA ,5 V, high-performance, single-ended, current-mode PWM controllerELECTRICAL CHARACTERISTICS(V = +15V, R = 10kΩ, C = 3.3nF, V = OPEN, C = 0.1µF, COMP = OPEN, V = 2V, ..
MAX5071AAUA+ ,High-Performance, Single-Ended, Current-Mode PWM Controllersfeaturesand UC2844 (MAX5070B)required for wide input voltage range isolated/nonisolated♦ 2A Drive S ..
MAX5071BAUA ,5 V, high-performance, single-ended, current-mode PWM controllerMAX5070/MAX507119-3283; Rev 1; 6/04High-Performance, Single-Ended, Current-ModePWM Controllers
MAX5072ETJ+ ,2.2MHz, Dual-Output Buck or Boost Converter with POR and Power-Fail OutputApplicationsSOURCE1 26 15 BYPASSxDSL Modems27 14SOURCE1 VLxDSL RoutersPGND 28 13 VLPoint-of-Load DC ..
MAX5073ETI ,2.2MHz, Dual-Output Buck or Boost Converter with Internal Power MOSFETsFeatures● 4.5V to 5.5V or 5.5V to 23V Input Supply The MAX5073 is a dual-output DC-DC converter wi ..
MAX934CSE ,Ultra Low-Power, Low-Cost Comparators with 2eferenceELECTRICAL CHARACTERISTICS—5V Operation(V+ = 5V, V- = GND = 0V, T = T to T , unless otherwise noted ..
MAX934CSE ,Ultra Low-Power, Low-Cost Comparators with 2eferenceFeaturesThe MAX931-MAX934 single, dual, and quad micropower, ' Ultra-Low 4µA Max Quiescent Currentl ..
MAX934CSE ,Ultra Low-Power, Low-Cost Comparators with 2eferenceApplications5 HYSTBattery-Powered SystemsThreshold Detectors6 REFMAX931Window ComparatorsV- GND21Os ..
MAX934CSE ,Ultra Low-Power, Low-Cost Comparators with 2eferenceELECTRICAL CHARACTERISTICS—5V Operation (continued)(V+ = 5V, V- = GND = 0V, T = T to T , unless oth ..
MAX934CSE+ ,Ultra-Low-Power, Low-Cost Comparators with 2% ReferenceELECTRICAL CHARACTERISTICS—5V Operation(V+ = 5V, V- = GND = 0V, T = T to T , unless otherwise noted ..
MAX934CSE+T ,Ultra-Low-Power, Low-Cost Comparators with 2% ReferenceGeneral Description ________


MAX5070AASA-MAX5070AAUA-MAX5070BASA-MAX5070BAUA-MAX5071BAUA
5 V, high-performance, single-ended, current-mode PWM controller
General Description
The MAX5070/MAX5071 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 voltage and telecom power
supplies.
The MAX5070/MAX5071 contain a fast comparator with
only 60ns typical delay from current sense to the output
for overcurrent protection. The MAX5070A/MAX5070B
have an integrated error amplifier with the output at
COMP. Soft-start is achieved by controlling the COMP
voltage rise using external components.
The frequency is adjustable from 20kHz to 1MHz with
an external resistor and capacitor. The timing capacitor
discharge current is trimmed allowing for programma-
ble dead time and maximum duty cycle for a given fre-
quency. The available saw-toothed waveform at RTCT
can be used for slope compensation when needed.
The MAX5071A/MAX5071B 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 pins of all devices together. When synchro-
nizing with other devices, the MAX5071A/MAX5071B
with the highest frequency synchronizes the other
devices. Alternatively, the MAX5071A/MAX5071B can
be synchronized to an external clock with an open-
drain output stage running at a higher frequency.
The MAX5071C 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 MAX5070/MAX5071 are available in 8-pin µMAX®
and SO packages and operate over the automotive tem-
perature 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 UC2842 (MAX5070A)
and UC2844 (MAX5070B)
2A Drive Source and 1A Sink CapabilityUp to 1MHz Switching Frequency OperationBidirectional Synchronization
(MAX5071A/MAX5071B)
Advanced Output Drive for Secondary-Side
Synchronous Rectification (MAX5071C)
Fast 60ns Cycle-by-Cycle Current LimitTrimmed Oscillator Capacitor Discharge Current
Sets Maximum Duty Cycle Accurately
Accurate 5% Start and Stop Voltage with 6V
Hysteresis
Low 32µA Startup Current5V Regulator Output (VREF) with 20mA CapabilityOvertemperature Shutdown
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Pin Configurations
Ordering Information

19-3283; Rev 1; 6/04
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= +15V, RT= 10kΩ, CT= 3.3nF, VVREF= OPEN, CVREF= 0.1µF, COMP = OPEN, VFB= 2V, CS = GND, TA= -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.
VCC(Low-Impedance Source) to GND..................-0.3V to +30V
VCC(ICC< 30mA).....................................................Self Limiting
OUT to GND...............................................-0.3V to (VCC+ 0.3V)
OUT Current.............................................................±1A for 10µs
FB, SYNC, COMP, CS, RT/CT, VREF to GND...........-0.3V to +6V
COMP Sink Current (MAX5070)..........................................10mA
Continuous Power Dissipation (TA = +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 (Automotive)....-40°C to +125°C
Maximum Junction Temperature.....................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +15V, RT= 10kΩ, CT= 3.3nF, VVREF= OPEN, CVREF= 0.1µF, COMP = OPEN, VFB= 2V, CS = GND, TA= -40°C to +85°C,
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +15V, RT= 10kΩ, CT= 3.3nF, VVREF= OPEN, CVREF= 0.1µF, COMP = OPEN, VFB= 2V, CS = GND, TA= -40°C to +85°C,
ELECTRICAL CHARACTERISTICS

(VCC= +15V, RT= 10kΩ, CT= 3.3nF, VVREF= OPEN, CVREF= 0.1µF, COMP = OPEN, VFB= 2V, CS = GND, TA= -40°C to +125°C,
unless otherwise noted.) (Note 1)
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +15V, RT= 10kΩ, CT= 3.3nF, VVREF= OPEN, CVREF= 0.1µF, COMP = OPEN, VFB= 2V, CS = GND, TA= -40°C to +125°C,
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +15V, RT= 10kΩ, CT= 3.3nF, VVREF= OPEN, CVREF= 0.1µF, COMP = OPEN, VFB= 2V, CS = GND, TA= -40°C to +125°C,
Note 1:All devices are 100% tested at +25°C. All limits over temperature are guaranteed by design, not production tested.
Note 2:
Guaranteed by design, not production tested.
Note 3:
Parameter measured at trip point of latch with VFB= 0V (MAX5070A/MAX5070B only).
Note 4:
Gain is defined as A = ∆VCOMP/∆VCS, 0 ≤VCS≤0.8V.
Note 5:
Output Frequency equals oscillator frequency for MAX5070A/MAX5071A. Output frequency is one-half oscillator frequency
for MAX5070B/MAX5071B/MAX5071C.
Typical Operating Characteristics

(VCC= 15V, TA = +25°C, unless otherwise noted.)
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Typical Operating Characteristics (continued)

(VCC= 15V, TA = +25°C, unless otherwise noted.)
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Typical Operating Characteristics (continued)

(VCC= 15V, TA = +25°C, unless otherwise noted.)
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Typical Operating Characteristics (continued)

(VCC= 15V, TA = +25°C, unless otherwise noted.)
Pin Descriptions
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Pin Descriptions (continued)
MAX5071A/MAX5071B/MAX5071C
Detailed Description
The MAX5070/MAX5071 current-mode PWM controllers
are designed for use as the control and regulation core of
flyback or forward topology switching power supplies.
These devices incorporate an integrated low-side driver,
adjustable oscillator, error amplifier (MAX5070A/
MAX5070B only), current-sense amplifier, 5V reference,
and external synchronization capability (MAX5071A/
MAX5071B only). An internal +26.5V current-limited VCC
clamp prevents overvoltage during startup.
Five different versions of the MAX5070/MAX5071 are
available. The MAX5070A/MAX5070B are the standard
versions with a feedback input (FB) and internal error
amplifier. The MAX5071A/MAX5071B include bidirection-
al synchronization (SYNC). This enables multiple
MAX5071A/MAX5071Bs to be connected and synchro-
nized to the device with the highest frequency. The
MAX5071C includes an ADV_CLK output, which pre-
cedes the MAX5071C’s drive output (OUT) by 110ns.
Figures 1, 2, and 3 show the internal functional diagrams
of the MAX5070A/MAX5070B, MAX5071A/MAX5071B,
and MAX5071C, respectively. The MAX5070A/
MAX5071A are capable of 100% maximum duty cycle.
The MAX5070B/MAX5071B/MAX5071C are designed to
limit the maximum duty cycle to 50%.
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers

Figure 1. MAX5070A/MAX5070B Functional Diagram
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