MAX15005BAUE/V+ Maxim Integrated Products, MAX15005BAUE/V+ Datasheet

IC PWR SUPPLY CTRLR 16-TSSOP

MAX15005BAUE/V+

Manufacturer Part Number
MAX15005BAUE/V+
Description
IC PWR SUPPLY CTRLR 16-TSSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX15005BAUE.pdf (27 pages)

Specifications of MAX15005BAUE/V+

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
1MHz
Duty Cycle
81.5%
Voltage - Supply
4.5 V ~ 40 V
Buck
No
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
Yes
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 125°C
Package / Case
16-TSSOP
Frequency-max
1MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX15004A/B/MAX15005A/B high-performance,
current-mode PWM controllers operate at an automo-
tive input voltage range from 4.5V to 40V (load dump).
The input voltage can go down as low as 2.5V after
startup if V
The controllers integrate all the building blocks neces-
sary for implementing fixed-frequency isolated/noniso-
lated power supplies. The general-purpose boost,
flyback, forward, and SEPIC converters can be
designed with ease around the MAX15004/MAX15005.
The current-mode control architecture offers excellent
line-transient response and cycle-by-cycle current limit
while simplifying the frequency compensation.
Programmable slope compensation simplifies the
design further. A fast 60ns current-limit response time,
low 300mV current-limit threshold makes the controllers
suitable for high-efficiency, high-frequency DC-DC con-
verters. The devices include an internal error amplifier
and 1% accurate reference to facilitate the primary-side
regulated, single-ended flyback converter or nonisolat-
ed converters.
An external resistor and capacitor network programs
the switching frequency from 15kHz to 500kHz (1MHz for
the MAX15005A/B). The MAX15004A/B/MAX15005A/B
provide a SYNC input for synchronization to an external
clock. The maximum FET-driver duty cycle for the
MAX15004A/B is 50%. The maximum duty cycle can be
set on the MAX15005A/B by selecting the right combi-
nation of RT and CT.
The input undervoltage lockout (ON/OFF) programs the
input-supply startup voltage and can be used to shut-
down the converter to reduce the total shutdown cur-
rent down to 10μA. Protection features include
cycle-by-cycle and hiccup current limit, output overvolt-
age protection, and thermal shutdown.
The MAX15004A/B/MAX15005A/B are available in
space-saving 16-pin TSSOP and thermally enhanced
16-pin TSSOP-EP packages. All devices operate over
the -40°C to +125°C automotive temperature range.
19-0723; Rev 3; 1/11
Pin Configurations appear at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Flyback/Boost/SEPIC Power-Supply Controllers
Automotive
Vacuum Fluorescent Display (VFD) Power
Supply
Isolated Flyback, Forward, Nonisolated SEPIC,
Boost Converters
CC
is supplied by an external bias voltage.
________________________________________________________________ Maxim Integrated Products
General Description
Applications
4.5V to 40V Input Automotive
♦ Wide 4.5V to 40V Operating Input Voltage Range
♦ Operates Down to 2.5V (with Bootstrapped V
♦ Current-Mode Control
♦ Low 300mV, 5% Accurate Current-Limit Threshold
♦ Internal Error Amplifier with 1% Accurate Reference
♦ RC Programmable 4% Accurate Switching
♦ Switching Frequency Adjustable from 15kHz to
♦ External Frequency Synchronization
♦ 50% (MAX15004) or Adjustable (MAX15005)
♦ Programmable Slope Compensation
♦ 10µA Shutdown Current
♦ Cycle-by-Cycle and Hiccup Current-Limit
♦ Overvoltage and Thermal Shutdown Protection
♦ -40°C to +125°C Automotive Temperature Range
♦ 16-Pin TSSOP or 16-Pin Thermally Enhanced
♦ AEC-Q100 Qualified
Note: All devices are specified over the -40°C to +125°C
temperature range.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
* EP = Exposed pad.
MAX15004AAUE+
MAX15004AAUE/V
MAX15004BAUE+
MAX15004BAUE/V
MAX15005AAUE+
MAX15005AAUE/V
MAX15005BAUE+
MAX15005BAUE/V
Bias)
Voltage
Frequency
500kHz (1MHz for the MAX15005A/B)
Maximum Duty Cycle
Protection
TSSOP-EP Packages
PART
PIN-PACKAGE
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP
16 TSSOP
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP
16 TSSOP
Ordering Information
MAX DUTY CYCLE
Programmable
Programmable
Programmable
Programmable
Features
50%
50%
50%
50%
CC
1

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MAX15005BAUE/V+ Summary of contents

Page 1

... Supply Isolated Flyback, Forward, Nonisolated SEPIC, Boost Converters Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 4.5V to 40V Input Automotive ♦ Wide 4.5V to 40V Operating Input Voltage Range ♦ ...

Page 2

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers ABSOLUTE MAXIMUM RATINGS IN to SGND.............................................................-0.3V to +45V IN to PGND.............................................................-0.3V to +45V ON/OFF to SGND ........................................-0. OVI, SLOPE, RTCT, SYNC, SS, FB, COMP SGND .........................................-0. ...

Page 3

Flyback/Boost/SEPIC Power-Supply Controllers ELECTRICAL CHARACTERISTICS (continued 14V 0.1μ 0.1μF // 1μ VCC 560pF 0V, COMP = unconnected, OUT = unconnected. T SYNC OVI ...

Page 4

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers ELECTRICAL CHARACTERISTICS (continued 14V 0.1μ 0.1μF // 1μ VCC 560pF 0V, COMP = unconnected, OUT ...

Page 5

Flyback/Boost/SEPIC Power-Supply Controllers ELECTRICAL CHARACTERISTICS (continued 14V 0.1μ 0.1μF // 1μ VCC 560pF 0V, COMP = unconnected, OUT = unconnected. T SYNC OVI ...

Page 6

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers ( 14V 0.1μF, C VCC = 0.1μF // 1μF, C REG5 = 1μF, V ON/OFF = 5V 0.01μF, C SLOPE = 100pF ...

Page 7

Flyback/Boost/SEPIC Power-Supply Controllers ( 14V 0.1μF, C VCC = 0.1μF // 1μF, C REG5 = 1μF, V ON/OFF = 5V 0.01μF, C SLOPE = 100pF 13.7kΩ 560pF. T ...

Page 8

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers ( 14V 0.1μF, C VCC = 0.1μF // 1μF, C REG5 = 1μF, V ON/OFF = 5V 0.01μF, C SLOPE = 100pF ...

Page 9

Flyback/Boost/SEPIC Power-Supply Controllers PIN NAME 1 IN Input Power Supply. Bypass IN with a minimum 0.1μF ceramic capacitor to PGND. ON/OFF Input. Connect ON/OFF to IN for always-on operation. To externally program the UVLO threshold of the IN supply, connect ...

Page 10

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers IN 1 1.228V OFF ON/OFF 2 ON/OFF COMP THERMAL SHUTDOWN OV-COMP OVI 3 1.228V SLOPE 4 COMPENSATION RTCT 6 OSCILLATOR CLK SGND 7 SYNC 8 10 ______________________________________________________________________________________ OFF 7.4V LDO PREREGULATOR REG ...

Page 11

Flyback/Boost/SEPIC Power-Supply Controllers Detailed Description The MAX15004A/B/MAX15005A/B are high-perfor- mance, current-mode PWM controllers for wide input- voltage range isolated/nonisolated power supplies. These controllers are for use as general-purpose boost, flyback, and SEPIC controllers. The input voltage range of 4.5V to ...

Page 12

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers operation of the power supply; however, to reduce the power dissipation of the internal LDO, it can be dis- abled by applying an external voltage higher than 7. (LDO output). ...

Page 13

Flyback/Boost/SEPIC Power-Supply Controllers (t ). See Figures 3a and 3b for a coarse selec- DISCHARGE tion of capacitor values for a given switching frequency and maximum duty cycle and then use the following equations to calculate the resistor value to ...

Page 14

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers MAX15005 MAXIMUM DUTY CYCLE vs. OUTPUT FREQUENCY (f 100 3300pF 2200pF 1500pF 560pF CT = 1000pF ...

Page 15

Flyback/Boost/SEPIC Power-Supply Controllers When the voltage produced by this current (through the current-sense resistor) exceeds the current-limit com- parator threshold, the MOSFET driver (OUT) quickly ter- minates the on-cycle. In most cases, a short-time constant RC filter is required to ...

Page 16

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers REG5 0.1μ Figure 5. Application Schematic Input Capacitor Selection in Boost Configuration The input current for the boost ...

Page 17

Flyback/Boost/SEPIC Power-Supply Controllers Δ V ESR = ESR I O × MAX = C OUT Δ × OUT is the load current, Δ the portion of the ripple due ...

Page 18

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers Selecting V The V external supply series resistor should be sized CC to provide enough average current from V the external MOSFET (I ) and I DRIVE clamped internally to 10.4V and ...

Page 19

Flyback/Boost/SEPIC Power-Supply Controllers Step 3) Calculate the secondary to primary turns ratio (N ) and the bias winding to primary turns ratio (N SP using the following equations and N ...

Page 20

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers An additional small LC filter may be necessary to sup- press the remaining low-energy high-frequency spikes. The LC filter also helps attenuate the switching frequen- cy ripple. Care must be taken to ...

Page 21

Flyback/Boost/SEPIC Power-Supply Controllers MOSFET, Diode, and Series Capacitor Selection in a SEPIC Converter For the SEPIC configuration, choose an n-channel MOSFET with a V rating at least 20% higher than the DS sum of the output and input voltages. When ...

Page 22

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers V IN 2.5V TO 16V C7 6.8μF D1 LL4148 100nF MAX15005A OFF ON/OFF 3 OVI 4 SLOPE C SLOPE 47pF 5 REG5 N.C. RT 15kΩ 6 RTCT ...

Page 23

Flyback/Boost/SEPIC Power-Supply Controllers Layout Recommendations Typically, there are two sources of noise emission in a switching power supply: high di/dt loops and high dv/dt surfaces. For example, traces that carry the drain cur- rent often form high di/dt loops. Similarly, ...

Page 24

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers V IN (5.5V TO 16V) C1 330μF 50V 0.1μF 50V MAX15005A/B R17 100kΩ ON/OFF V R18 IN 47.5kΩ 1% R11 182kΩ OVI R12 12.1kΩ 1% ...

Page 25

Flyback/Boost/SEPIC Power-Supply Controllers V IN (4.5V TO 16V) C1 10μF 25V 1 IN C11 0.1μF R11 301kΩ 2 ON/OFF V OUT R10 100kΩ R8 153kΩ 3 OVI R9 10kΩ 4 SLOPE C2 100pF 5 N.C. R2 REG5 13kΩ 6 RTCT ...

Page 26

Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers TOP VIEW + IN 1 ON/OFF 2 OVI 3 MAX15004A SLOPE 4 MAX15005A N.C. 5 RTCT 6 SGND 7 SYNC 8 EP TSSOP-EP Chip Information PROCESS: BiCMOS 26 ______________________________________________________________________________________ ...

Page 27

... Initial release Updated Features, revised equations on pages 13, 20, and 21, revised Figure 8 with 1 11/07 correct MOSFET, and updated package outline Added MAX15005BAUE/V+ automotive part, updated Features, updated Package 2 12/10 Information, style edits Added MAX15004AAUE/V+, MAX15004BAUE/V+, MAX15005AAUE/V+ automotive 3 1/11 parts to the Ordering Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product ...

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