MAX15005AAUE+T Maxim Integrated Products, MAX15005AAUE+T Datasheet

IC PWR SUPPLY CNTRLR 16-TSSOP

MAX15005AAUE+T

Manufacturer Part Number
MAX15005AAUE+T
Description
IC PWR SUPPLY CNTRLR 16-TSSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX15005BAUE.pdf (27 pages)

Specifications of MAX15005AAUE+T

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 Exposed Pad, 16-eTSSOP, 16-HTSSOP
Frequency-max
1MHz
Duty Cycle (max)
80 %
Output Voltage
1.23 V to 100 V
Output Current
1000 mA
Mounting Style
SMD/SMT
Switching Frequency
15 KHz to 500 KHz
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Synchronous Pin
Yes
Topology
Boost, Flyback, Forward
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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MAX15005AAUE+T 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

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 27 © 2011 Maxim Integrated Products 4 ...

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