Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - DC/DC voltage regulator Holder uMAX 10

General Description

The MAX17552 high-efficiency, high-voltage, syn-

chronous step-down DC-DC converter with integrated

MOSFETs operates over a 4V to 60V input voltage range.

The converter can deliver output current up to 100mA at

output voltages of 0.8V to 0.9 x V

. The output voltage

is accurate to within ±1.75% over the -40°C to +125°C

temperature range.

The device employs a peak-current-mode control

architecture with a MODE pin that can be used to operate

the device in pulse-width modulation (PWM) or pulse-

frequency modulation (PFM) control schemes. PWM

operation provides constant frequency operation at all

loads and is useful in applications sensitive to variable

switching frequency. PFM operation disables negative

inductor current and additionally skips pulses at light

loads for high efficiency. The converter consumes only

22µA of no-load supply current in PFM mode. The low-

resistance, on-chip MOSFETs ensure high efficiency at

full load and simplify PCB layout.

The device offers programmable switching frequency

to optimize solution size and efficiency. Programmable

soft-start allows the user to reduce the inrush currents.

An EN/UVLO pin allows the user to turn on/off the device

at the desired input-voltage level. An open-drain RESET

pin allows output-voltage monitoring. The device operates

over the -40°C to +125°C industrial temperature range

and is available in a compact 10-pin (3mm x 2mm) TDFN

and 10-pin (3mm x 3mm) μMAX

packages. Simulation

models are available.

Applications

● Industrial Sensors and Process Control

● 4mA–20mA Current-Loop Powered Sensors

● High-Voltage LDO Replacement

● Battery-Powered Equipment

● HVAC and Building Control

● General-Purpose Point-of-Load

Benets and Features

● Eliminates External Components and Reduces Total

Cost

• No Schottky—Synchronous Operation for High

Efficiency and Reduced Cost

• Internal Compensation

• Fixed Internal 5.1ms or Programmable Soft-Start

• All-Ceramic Capacitors, Ultra-Compact Layout

● Reduces Number of DC-DC Regulators to Stock

• Wide 4V to 60V Input Voltage Range

• Adjustable 0.8V to 0.9 x V

Output Voltages

• Delivers Up to 100mA Load Current

• 100kHz to 2.2MHz Adjustable Switching Frequency

Range with External Synchronization

• Configurable Between PFM and Forced-PWM

Modes

● Reduces Power Dissipation

• 22µA No Load Supply Current

• Peak Efficiency > 90%

• PFM Feature for High Light-Load Efficiency

• 1.2μA (typ) Shutdown Current

● Operates Reliably in Adverse Industrial Environments

• Peak Current-Limit Protection

• Built-In Output-Voltage Monitoring with Open-Drain

RESET Pin

• Programmable EN/UVLO Threshold

• Monotonic Startup into Prebiased Output

• Overtemperature Protection

• -40°C to +125°C Industrial/Automotive Temperature

Range

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer

to www.maximintegrated.com/MAX17552.related.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

MAX17552 60V, 100mA, Ultra-Small, High-Efficiency,

Synchronous Step-Down DC-DC Converter

with 22µA No-Load Supply Current

19-6903; Rev 1; 6/14

EVALUATION KIT AVAILABLE

Summary of content (20 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX17552 60V, 100mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current General Description Benefits and Features The device employs a peak-current-mode control architecture with a MODE pin that can be used to operate the device in pulse-width modulation (PWM) or pulsefrequency modulation (PFM) control schemes.
PAGE 2
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Absolute Maximum Ratings IN, EN/UVLO, VOUT, RESET to GND.....................-0.3V to 70V LX to GND....................................................... -0.3V to IN + 0.3V RT/SYNC, SS, FB, MODE to GND............................-0.3V to 6V LX Total RMS Current.........................................................±1.6A Output Short-Circuit Duration...................................
PAGE 3
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Electrical Characteristics (continued) (VIN = 24V, VGND = 0V, VVOUT = 3.3V, VFB = 0.85V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, LX = SS = MODE = RESET = unconnected; TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 4.4 5.1 5.8 ms 4.
PAGE 4
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Electrical Characteristics (continued) (VIN = 24V, VGND = 0V, VVOUT = 3.3V, VFB = 0.85V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, LX = SS = MODE = RESET = unconnected; TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Typical Operating Characteristics (VIN = 24V, VGND = 0V, VOUT = 3.3V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, CIN = 1μF, TA = +25°C unless otherwise noted) EFFICIENCY vs. LOAD CURRENT EFFICIENCY vs. LOAD CURRENT 100 80 80 80 70 70 70 VIN = 36V 40 0 1 10 10 0 1 10 VIN = 48V 30 VIN = 60V 20 FIGURE 7 APPLICATION CIRCUIT PWM MODE, VOUT = 3.
PAGE 6
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Typical Operating Characteristics (continued) (VIN = 24V, VGND = 0V, VOUT = 3.3V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, CIN = 1μF, TA = +25°C unless otherwise noted) SHUTDOWN CURRENT vs. INPUT VOLTAGE NO LOAD SUPPLY CURRENT vs. INPUT VOLTAGE toc10 60 40 20 0 5 15 25 35 45 2.5 1.0 -0.5 -2.0 55 INPUT VOLTAGE (V) SWITCH CURRENT LIMIT vs.
PAGE 7
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Typical Operating Characteristics (continued) (VIN = 24V, VGND = 0V, VOUT = 3.3V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, CIN = 1μF, TA = +25°C unless otherwise noted) LOAD TRANSIENT RESPONSE PFM MODE (LOAD CURRENT STEPPED FROM 5mA to 50mA) toc19 VOUT (AC) 100mV/div FIGURE7 FIGURE 7APPLICATION APPLICATION CIRCUIT VOUT = 3.3V VOUT=3.
PAGE 8
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Typical Operating Characteristics (continued) (VIN = 24V, VGND = 0V, VOUT = 3.3V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, CIN = 1μF, TA = +25°C unless otherwise noted) SOFT-START toc28 VEN 5V/div SHUTDOWN WITH ENABLE SOFT-START WITH 3V PREBIAS toc30 toc29 /UVLO VEN/UVLO VEN/UVLO 5V/div 5V/div 1V/div 1V/div FIGURE 7 APPLICATION CIRCUIT VOUT = 3.
PAGE 9
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Pin Configuration TOP VIEW LX 10 GND MODE RESET VOUT 9 8 7 6 MAX17552 + 1 IN 2 3 4 5 EN/ RT/ SS UVLO SYNC FB IN 1 EN/UVLO 2 RT/SYNC 3 SS FB + MAX17552 10 LX 9 GND 8 MODE 4 7 RESET 5 6 VOUT µMAX 3mm x 3mm TDFN 3mm x 2mm Pin Description PIN NAME 1 IN Switching Regulator Input. Connect a X7R 1µF ceramic capacitor from IN to GND for bypassing.
PAGE 10
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Block Diagram IN INTERNAL LDO REGULATOR VOUT POK VCC_INT PEAK-LIMIT EN/UVLO CURRENTSENSE LOGIC CHIPEN 1.25V PFM THERMAL SHUTDOWN CLK RT/SYNC PFM/PWM CONTROL LOGIC OSCILLATOR SLOPE VCC_INT SLOPE SS CS INTERNAL OR EXTERNAL SOFT-START CONTROL DH LX LOW-SIDE DRIVER MODE SELECT 1.
PAGE 11
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Detailed Description The MAX17552 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4V to 60V input voltage range. The converter can deliver output current up to 100mA at output voltages of 0.8V to 0.9 x VIN. The output voltage is accurate to within ±1.75% over -40°C to +125°C.
PAGE 12
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Switching Frequency (RT/SYNC) Switching frequency of the device can be programmed from 100kHz to 2.2MHz by using a resistor connected from RT/SYNC to GND.
PAGE 13
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current duty cycle and circuit voltage drops. The minimum and maximum operating input voltages for a given output voltage should be calculated as follows: VINMIN VOUT + (I OUT × (R DCR + 2.6)) + (I OUT × 2.
PAGE 14
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Frequency Range (kHz) Minimum Output Capacitance (μF) 50 100 to 130 VOUT 25 160 to 230 VOUT 17 280 to 2200 VOUT It should be noted that dielectric materials used in ceramic capacitors exhibit capacitance loss due to DC bias levels and should be appropriately derated to ensure the required output capacitance is obtained in the application.
PAGE 15
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current output inductor. See the Typical Operating Characteristics for the power-conversion efficiency or measure the efficiency to determine the total power dissipation. 4.
PAGE 16
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current VIN IN MAX17552 R1 CIN R2 L1 LX VOUT COUT EN/UVLO GND SS VOUT CF CSS MODE R7 R4 FB VOUT R5 R6 RT/SYNC R3 RESET GND PLANE CIN VIN PLANE R1 R2 U1 LX COUT IN EN /UVLO GND RT /SYNC MODE SS R3 VOUT PLANE L1 CSS RESET VOUT FB R6 GND PLANE R4 R7 R5 CF VIAS TO BOTTOM SIDE GROUND PLANE VIAS TO VOUT Figure 5. Layout Guidelines www.maximintegrated.
PAGE 17
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Typical Application Circuits VIN 6V TO 60V CIN 1µF IN MAX17552 EN/UVLO L1 220µH LX COUT 10µF GND MODE C1 0.22µF RT/SYNC MAX17552 EN/UVLO SS LX RT/SYNC R2 49.9kΩ L1 150µH VOUT 3.3V, 100mA COUT 10µF GND VOUT MODE R1 261kΩ FB R3 191kΩ IN CIN 1µF R4 22.1Ω SS VOUT VIN 4V TO 60V VOUT 5V, 100mA R4 22.1Ω C1 0.22µF R1 158kΩ FB R2 49.
PAGE 18
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Typical Application Circuits (continued) VIN 4V TO 45V CIN 1µF IN MAX17552 EN/UVLO SS MODE LX L1 68µH VIN 4V TO 24V COUT 10µF GND VOUT IN CIN 1µF R4 22.1Ω MAX17552 EN/UVLO SS C1 0.22µF R1 158kΩ FB MODE R2 49.9kΩ RT/SYNC R3 69.8kΩ VOUT 3.3V, 100mA R3 69.8kΩ GND VOUT R1 127kΩ FB R2 100kΩ RESET L1 COILCRAFT LPS3015-333M COUT MURATA 10µF/X7R/6.
PAGE 19
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Package Information Ordering Information PART TEMP RANGE PIN-PACKAGE MAX17552ATB+ -40°C to +125°C 10 TDFN-EP* MAX17552AUB+ -40°C to +125°C 10 μMAX +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Chip Information PROCESS: BiCMOS www.maximintegrated.com For the latest package outline information and land patterns (footprints), go to www.maximintegrated.
PAGE 20
MAX17552 60V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22µA No-Load Supply Current Revision History REVISION NUMBER REVISION DATE 0 2/14 Initial release — 1 6/14 Added statement regarding EN/UVLO connection 11 DESCRIPTION PAGES CHANGED For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.