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Part: MAX618EEE
Category:
Power Management
-> DC-DC Converters
-> Step-up
Description: 28v, Pwm, Step-up DC-DC Converter
Company: Maxim Integrated Products
Datasheet: Download MAX618EEE datasheet File size : 443 kB
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Datasheet text preview:
19-1462; Rev 0; 6/99
UAL IT MAN TION K T VALUA A SHEE E S DAT OLLOW F
28V, PWM, Step-Up DC-DC Converter
Features
o Adjustable Output Voltage Up to +28V o Up to 93% Efficiency o Wide Input Voltage Range (+3V to +28V) o Up to 500mA Output Current at +12V o 500µA Quiescent Supply Current o 3µA Shutdown Current o 250kHz Switching Frequency o Small 1W 16-Pin QSOP Package
General Description
The MAX618 CMOS, PWM, step-up DC-DC converter g e n e r a t e s output voltages up to 28V and accepts inputs from +3V to +28V. An internal 2A, 0.3 switch eliminates the need for external power MOSFETs while s u p p l y i n g output currents up to 500mA or more. A PWM control scheme combined with Idle ModeTM operation at light loads minimizes noise and ripple while maximizing efficiency over a wide load range. No-load operating current is 500µA, which allows efficiency up to 93%. A fast 250kHz switching frequency allows the use of small surface-mount inductors and capacitors. A shutdown mode extends battery life when the device is not i n use. Adaptive slope compensation allows the MAX618 to accommodate a wide range of input and o u t p u t voltages with a simple, single compensation capacitor. The MAX618 is available in a thermally enhanced 16pin QSOP package that is the same size as an industrys t a n d a r d 8-pin SO but dissipates up to 1W. An e v a l u a t i o n kit (MAX618EVKIT) is available to help speed designs.
MAX618
Ordering Information
PART MAX618EEE TEMP. RANGE -40°C to +85°C PIN-PACKAGE 16 QSOP
Applications
Automotive-Powered DC-DC Converters Industrial +24V and +28V Systems LCD Displays Palmtop Computers
Typical Operating Circuit Pin Configuration
TOP VIEW
GND 1 LX 2 LX 3 LX 4 SHDN 5 COMP 6 FB 7 GND 8 16 GND 15 PGND 14 PGND
VIN 3V TO 28V
IN
LX
VOUT UP TO 28V
MAX618
SHDN PGND
MAX618
13 PGND 12 GND 11 VL 10 IN 9 GND
VL
FB
COMP
GND
QSOP
Idle Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
28V, PWM, Step-Up DC-DC Converter MAX618
ABSOLUTE MAXIMUM RATINGS
IN to GND ......-0.3V to +30V LX to GND .....-0.3V to +30V VL to GND .......-0.3V to +6V SHDN, COMP, FB to GND ....-0.3V to (VL + 0.3V) PGND to GND............±0.3V Continuous Power Dissipation (TA = +70°C) (Note 1) 16-Pin QSOP (derate 15mW/°C above +70°C)..........1W Note 1: With part mounted on 0.9 in.2 of copper.
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.
Operating Temperature Range ...-40°C to +85°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10sec) .....+300°C
ELECTRICAL CHARACTERISTICS
(VIN = +6V, PGND = GND, CVL = 4.7µF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Input Voltage Supply Current, No Load Supply Current, Full Load, VL Connected to IN Supply Current, Full Load Shutdown Supply Current VL Output Voltage VL Load Regulation VL Undervoltage Lockout FB Set Voltage FB Input Bias Current Line Regulation Load Regulation LX Voltage LX Switch Current Limit Idle Mode Current-Limit Threshold LX On-Resistance LX Leakage Current COMP Maximum Output Current COMP Current vs. FB Voltage Transconductance SHDN Input Logic Low SHDN Input Logic High Shutdown Input Current Switching Frequency Maximum Duty Cycle f DC VIL VIH SHDN = GND or VL 200 90 250 95 2.0 1 300 RLXON ILXOFF ICOMP VLX = 28V FB = GND FB = 0.1V 100 0.8 VFB IFB VOUT VOUT VLX ILXON PWM mode 1.7 0.25 2.2 0.35 0.3 0.02 200 1 0.8 VFB = 1.6V VIN = 3V to 6V, VOUT = 12V VOUT = 12V, ILOAD = 10mA to 500mA SYMBOL VIN IIN IIN IIN IIN VVL VVL VIN = 3V to 28V, VFB = 1.6V, SHDN = VL VIN = 3V to 5.5V, VFB = 1.4V, SHDN = VL = IN VIN = 3.4V to 28V, VFB = 1.4V, SHDN = VL, VVL < VIN VIN = 28V, VFB = 1.6V, SHDN = GND VIN = 3.5V or 28V, no load ILOAD = 0 to 2mA, VFB = 1.6V Rising edge, 1% hysteresis 2.58 1.47 2.9 CONDITIONS MIN 3 500 5 2.5 3 3.05 25 2.7 1.5 1 0.01 0.2 28 2.7 0.45 0.6 10 TYP MAX 28 700 6.5 3.5 8 3.2 40 2.8 1.53 50 0.08 UNITS V µA mA mA µA V mV V V nA %/V % V A A µA µA mmho V V µA kHz %
2
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28V, PWM, Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS
(VIN = +6V, PGND = GND, CVL = 4.7µF, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER Input Voltage Supply Current, No Load Supply Current, Full Load, VL Connected to IN Supply Current, Full Load Supply Current Shutdown VL Output Voltage VL Undervoltage Lockout FB Set Voltage LX Voltage Range LX Switch Current Limit LX On-Resistance Switching Frequency SYMBOL VIN IIN IIN IIN IIN VVL VVL VFB VLXON ILXON RLXON f 188 PWM mode 1.4 VIN = 3V to 28V, VFB = 1.6V, SHDN = VL VIN = 3V to 5.5, VFB = 1.4V, SHDN = VL = IN VIN = 3.4V to 28V, VFB = 1.4V, SHDN = VL, VL < VIN VIN = 28V, VFB = 1.6V, SHDN = GND VIN = 3.5V or 28V, no load Rising edge, 1% hysteresis 2.85 2.55 1.455 CONDITIONS MIN 3 TYP MAX 28 800 7.5 4 10 3.3 2.85 1.545 28 3 0.6 312 UNITS V µA mA mA µA V V V V A kHz
MAX618
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, TA = +25°C.)
EFFICIENCY vs. OUTPUT CURRENT (VOUT = 12V)
MAX618 toc01
EFFICIENCY vs. OUTPUT CURRENT (VOUT = 28V)
VIN = 12V VIN = 5V VIN = 3V 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0
MAX618 toc02
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0.1 1 10 100 OUTPUT CURRENT (mA) VIN = 3V
VIN = 8V VIN = 5V
100
1000
0.1
1 10 100 OUTPUT CURRENT (mA)
1000
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