Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - DC/DC voltage regulator Holder TSSOP 16 EP

MAX16962

4A, 2.2MHz, Synchronous Step-Down

DC-DC Converter

General Description

The MAX16962 is a high-efficiency, synchronous step-

down converter that operates with a 2.7V to 5.5V input

voltage range and provides a 0.8V to 3.6V output voltage

range. The wide input/output voltage range and the abil-

ity to provide up to 4A to load current make this device

ideal for on-board point-of-load and post-regulation

applications. The MAX16962 achieves -3.7%/+2.6% out-

put error over load, line, and temperature ranges.

The MAX16962 features a 2.2MHz fixed-frequency PWM

mode for better noise immunity and load transient

response, and a pulse frequency modulation mode

(SKIP) for increased efficiency during light-load opera-

tion. The 2.2MHz frequency operation allows for the use

of all-ceramic capacitors and minimizes external compo-

nents. The optional spread-spectrum frequency modula-

tion minimizes radiated electromagnetic emissions.

Integrated low R

DSON

switches improve efficiency at

heavy loads and make the layout a much simpler task

with respect to discrete solutions.

The MAX16962 is offered with factory-preset output

voltages or with an adjustable output voltage. (See the

Selector Guide for options). Factory preset output volt-

age versions allow customers to achieve -3.7%/+2.6%

output voltage accuracy without using external resistors,

while the adjustable output voltage version provides the

flexibility to set the output voltage to any desired value

between 0.8V to 3.6V using an external resistive divider.

Additional features include 8ms soft-start, 16ms power-

good output delay, overcurrent, and overtemperature

protections.

The MAX16962 is available in thermally enhanced

16-pin TSSOP-EP and 4mm x 4mm, 16-pin TQFN-

EP packages, and is specified for operation over

the -40NC to +125NC automotive temperature range.

Benefits and Features

S Small External Components

 2.2MHz Operating Frequency

S Ideal for Point-of-Load Applications

 4A Maximum Load Current

 Adjustable Output Voltage: 0.8V to 3.6V

 2.7V to 5.5V Operating Supply Voltage

S High Efficiency at Light Load

 26µA Skip Mode Quiescent Current

S Minimizes Electromagnetic Interference

 Programmable SYNC I/O Pin

 Operates Above AM-Radio Band

 Available Spread Spectrum

S Low Power Mode Saves Energy

 1µA Shutdown Current

 Open-Drain Power-Good Output

S Limits Inrush Current During Startup

 Soft-Start

S Overtemperature and Short-Circuit Protections

S 4mm x 4mm, 16-Pin Thin QFN and 16-Pin TSSOP

Packages

S -40°C to 125°C Operating Temperature Range

Applications

Automotive Infotainment

Point-of-Load Applications

Industrial/Military

Typical Application Circuit

19-6213; Rev 2; 5/14

Ordering Information appears at end of data sheet.

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

refer to www.maximintegrated.com/MAX16962.related.

MAX16962

OUTSPV1

LX1

PGND1

PGND2

LX2

0.47µH

47µF

20kΩ

10Ω

4.7µF

1µF

PV1

OUT1

PV2

GND

OUT1

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

Summary of content (13 pages)

PAGE 1
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter General Description The MAX16962 is a high-efficiency, synchronous stepdown converter that operates with a 2.7V to 5.5V input voltage range and provides a 0.8V to 3.6V output voltage range. The wide input/output voltage range and the ability to provide up to 4A to load current make this device ideal for on-board point-of-load and post-regulation applications. The MAX16962 achieves -3.7%/+2.6% output error over load, line, and temperature ranges.
PAGE 2
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter ABSOLUTE MAXIMUM RATINGS PV, PV1, PV2 to GND...............................................-0.3V to +6V EN, PG to GND........................................................-0.3V to +6V PGND1 and PGND2 to GND ...............................-0.3V to +0.3V LX1, LX2 Continuous RMS Current (LX1 connected in Parallel with LX2)....................................4A LX Current (LX1 connected in Parallel with LX2).....
PAGE 3
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter ELECTRICAL CHARACTERISTICS (continued) (VPV = VPV1 = VPV2 = 5V, VEN = 5V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) Maximum pMOS Current-Limit Threshold PARAMETER Maximum Output Current ILIMP1 SYMBOL IOUT OUTS Bias Current IB_OUTS LX_ Leakage Current ILX_LEAK Minimum On-Time tON_MIN LX Discharge Resistance LX1 and LX2 shorted together RLX CONDITIONS (VOUT + 0.5V P VPV1 P 5.
PAGE 4
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter ELECTRICAL CHARACTERISTICS (continued) (VPV = VPV1 = VPV2 = 5V, VEN = 5V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP Input Voltage Hysteresis MAX UNITS 50 Pulldown Resistor 50 mV 100 200 kI 0.4 V DIGITAL OUTPUT (SYNC AS OUTPUT) Output Voltage Low VOL ISINK = 3mA Output Voltage High VOH VPV = 5V, ISOURCE = 3mA Note Note Note Note 4.
PAGE 5
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) TA = -40°C 3.24 20 0 0.0001 fSW = 2.2MHz, SKIP MODE 0.0010 0.01 0.1 1.0 3.20 0 40 35 1.800 25 20 1.780 15 1.770 10 TA = +125°C 26 TA = +125°C 30 1.790 TA = -40°C 16 3.5 3.9 4.3 4.7 5.1 5.5 2.5 3.0 3.5 VPV (V) 4.0 4.5 2.18 VIN = 5V PWM MODE 2.16 TEMPERATURE (°C) SHUTDOWN CURRENT vs. VPV fSW (MHz) 0.5A 0A 2.12 2.10 2.08 2.
PAGE 6
MAX16962 4A, 2.
PAGE 7
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter Pin Descriptions (continued) PIN NAME FUNCTION 14 PV Device Supply Voltage Input. Bypass with at least a 1FF ceramic capacitor to GND. In addition, connect a 10I decoupling resistor between PV and the bypass capacitor. 16 2 PV2 Input Supply 2. Bypass PV2 with at least a 4.7FF ceramic capacitor to PGND2. Connect PV2 to PV1 for normal operation. — — EP Exposed Pad.
PAGE 8
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter CURRENT-SENSE AMP PV1 PV MAX16962 SKIP CURRENT COMP PV2 PV1 CLK PEAK CURRENT COMP RAMP GENERATOR CONTROL LOGIC STEP-DOWN Σ PGND LX1 LX2 PV PMW COMP PWM PGND PGND2 VREF SOFT-START GENERATOR ERROR AMP ZERO-CROSSING COMP FPWM CLK PGND1 CURRENT LIM COMP OUTS OSC. SYNC POWER-GOOD COMP P1-OK FEEDBACK DRIVER CLK FPWM OTP VOLTAGE REFERENCE TH-SD P1-OK EN TRIM BITS VREF PG MAIN CONTROL LOGIC GND Figure 1.
PAGE 9
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter Table 1. Inductor Values vs. (VIN - VOUT) VIN - VOUT (V) 5.0 to 3.3 5.0 to 2.5 5.0 to 1.5 3.3 to 0.8 INDUCTOR (µH) 0.8 0.6 0.47 0.33 Inductor Selection VOUT R1 C1 MAX16962 OUTS R2 Three key inductor parameters must be specified for operation with the MAX16962: inductance value (L), inductor saturation current (ISAT), and DC resistance (RDCR).
PAGE 10
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter Input Capacitor The input filter capacitor reduces peak currents drawn from the power source and reduces noise and voltage ripple on the input caused by the circuit’s switching. The input capacitor RMS current requirement (IRMS) is defined by the following equation: IRMS = ILOAD(MAX) VOUT (VPV1 − VOUT ) VPV1 IRMS has a maximum value when the input voltage equals twice the output voltage (VPV1 = 2VOUT), so IRMS(MAX) = ILOAD(MAX)/2.
PAGE 11
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter PCB Layout Guidelines Careful PCB layout is critical to achieve low switching losses and clean, stable operation. Use a multilayer board whenever possible for better noise immunity and power dissipation. Follow these guidelines for good PCB layout: 1) Use a large contiguous copper plane under the MAX16962 package. Ensure that all heat-dissipating components have adequate cooling.
PAGE 12
MAX16962 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter Ordering Information TEMP RANGE LOAD CURRENT CAPABILITY (A) MAX16962_ATE_/V+ PART -40°C to +125°C 4 PIN-PACKAGE 16 TQFN-EP* MAX16962_AUE_/V+ -40°C to +125°C 4 16 TSSOP-EP* Note: “_” is a package suffix placeholder for either “R” or “S,” as shown the Selector Guide. The second “_” is in the option suffix. /V denotes an automotive qualified part. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
PAGE 13
MAX16962 4A, 2.