MAX16947 Maxim, MAX16947 Datasheet

MAX16947

Manufacturer Part Number

MAX16947

Description

The MAX16946/MAX16947 high-voltage, high-side, current-sense LDO/switches feature internal current limiting to prevent system damage due to fault conditions

Manufacturer

Maxim

Datasheet

1.MAX16946.pdf (21 pages)

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19-5575; Rev 0; 9/10

The MAX16946/MAX16947 high-voltage, high-side, cur-

rent-sense LDO/switches feature internal current limiting

to prevent system damage due to fault conditions. The

MAX16946 provides a fixed regulated 8.5V output volt-

age or an adjustable 3.3V to 15V output voltage. The

MAX16946 can also be configured as a switch, while

the MAX16947 is only available as a switch. The input

voltage range for both devices extends from 4.5V to 18V

(45V tolerant), making the devices ideal for providing

phantom power to remote radio-frequency low-noise

amplifiers (LNAs) in automotive applications.

The devices monitor the load current and provide an

analog output voltage proportional to the sensed load

current. Accurate internal current limit protects the input

supply against both overload and short-circuit condi-

tions. Two open-drain fault indicator outputs indicate to

the microprocessor when a short circuit, an open-load

condition, or a short-to-battery condition exists. An over-

temperature shutdown is also indicated by means of the

current-sense amplifier’s output voltage.

A fault-blanking feature allows the devices to ignore

momentary faults such as those caused by the charg-

ing of capacitive loads during hot-swapping, preventing

false alarms to the system. The devices feature short-

to-battery protection to latch off the internal LDO/pass

switch during a short-to-battery event. During a thermal

overload, the devices reduce power dissipation by going

into thermal shutdown. They include an active-low, high-

voltage-compatible shutdown input to place them in low-

power shutdown mode.

The MAX16946 is available in thermally enhanced, 16-pin

TQFN-EP and QSOP-EP packages. The MAX16947 is avail-

able in a 16-pin QSOP package. Both devices operate over

the -40NC to +105NC temperature range.

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.

Note: All devices are specified over the -40°C to +105°C

operating temperature range.

/V Denotes an automotive qualified part.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

**Future product—contact factory for availability.

MAX16946GEE/V+**

MAX16946GTE/V+

MAX16947GEE/V+**

PART

_______________________________________________________________ Maxim Integrated Products 1

Ordering Information

PIN-PACKAGE

16 QSOP-EP*

16 TQFN-EP*

16 QSOP

General Description

Remote Antenna, Current-Sense and

Switch or LDO

OUTPUT

Switch

S Switch Phantom Power-On/Off Under µC Control

S Precision Adjustable Current Limit

S Regulated Output Voltage (MAX16946)—8.5V

S Current Measurement Analog Voltage Output

S Detect Open-Load and Short-Circuit Conditions

S Provide Open-Drain Fault Signals (SC and OL)

S Overcurrent Blanking During Startup

S Thermal Shutdown

S AEC-Q100 Qualified

S -40NC to +105NC Operating Temperature Range

() MAX16947

SHDN

SENS

AOUT

GND

REG

Fixed or Adjustable Between 3.3V and 15V

Remote LNA Phantom Power

Automotive Safety and Infotainment

Automotive Remote Module Power

300mA (max), T

500mA (max), T

Mode Only)

HIGH

VOLTAGE

REGULATOR

REVERSE

CURRENT REF

26V/V

BUFFER

REVERSE-

CURRENT

COMP

REF

OSCILLATOR

ULVO +

REFUV

LOGIC

TIMER

CHARGE PUMP AND GATE DRIVER

SHORT-TO

BATTERY

COMP

LDO/Switches

Functional Diagram

MAX16946

MAX16947

OVLO

= +105NC

= +85NC (MAX16946 in SW

CURRENT

LIMIT COMP

SHUTDOWN

BANDGAP

THERMAL

Applications

AND

SC REF

Features

SC COMP

BUFFER

OL COMP

OUT

(GND)

COMP

LIM

OLT

REF

Related parts for MAX16947

MAX16947 Summary of contents

Page 1

... MAX16946 provides a fixed regulated 8.5V output volt- age or an adjustable 3.3V to 15V output voltage. The MAX16946 can also be configured as a switch, while the MAX16947 is only available as a switch. The input voltage range for both devices extends from 4.5V to 18V (45V tolerant), making the devices ideal for providing phantom power to remote radio-frequency low-noise amplifiers (LNAs) in automotive applications ...

Page 2

... For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 ...

Page 3

... OUT_OFF COMP Power-Down Resistor R COMP_OFF Value CURRENT-SENSE AMPLIFIER AOUT Gain Current-Sense Amplifier V Input Voltage Range AOUT Zero-Current Output V AOUT_ZS Voltage Maximum AOUT Voltage V AOUT_FS AOUT Drive Capability I AOUT AOUT Leakage Current I AOUT_LEAK SENS Leakage Current I SENS _LEAK REFERENCE REF Output Voltage ...

Page 4

... V = 1.05V +25NC OLT 1.05V +105NC OLT A A switched open load is blanked for < I OUT derived from REF then maximum LIM voltage at LIM is 3V (Note 2.675V LIM V = 2.675V +25NC LIM 2.675V +105NC LIM A Rising V at which the SC output ...

Page 5

... TEMPERATURE (°C) LDO/Switches = T = +25NC MIN TYP MAX 2.7 0.8 5 150 256 420 OPERATING SUPPLY CURRENT vs. TEMPERATURE (MAX16946/MAX16947 SWITCH CONFIGURATION 100 125 -50 - TEMPERATURE (°C) SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE GND SHDN = ...

Page 6

Remote Antenna, Current-Sense and LDO/Switches (V = 14V 0.5ω +25 ° C, unless otherwise noted.) IN SENSE A DROPOUT VOLTAGE vs. LOAD CURRENT (SWITCHED OUTPUT) 340 320 300 280 260 240 220 T = +25°C A ...

Page 7

Remote Antenna, Current-Sense and (V = 14V 0.5ω +25 ° C, unless otherwise noted.) IN SENSE A LOAD TRANSIENT RESPONSE (5V LDO MODE) 100µs/div POWER-UP WAVEFORMS (V = 8.5V, I OUT OUT 2ms/div STARTUP WAVEFORMS (V ...

Page 8

... Remote Antenna, Current-Sense and LDO/Switches (V = 14V 0.5ω +25 ° C, unless otherwise noted.) IN SENSE A HIGH-VOLTAGE LINE TRANSIENT RESPONSE (MAX16947) 100ms/div CURRENT-SENSE AMPLIFIER GAIN vs. TEMPERATURE 26.00 25.95 25.90 25.85 25.80 25.75 25.70 25.65 25.60 -40 -25 - TEMPERATURE (°C) OVERCURRENT BLANKING TIME vs. SUPPLY VOLTAGE 400 FB = GND 350 300 250 200 150 100 ...

Page 9

Remote Antenna, Current-Sense and (V = 14V 0.5ω +25°C, unless otherwise noted.) SENSE A IN DROPOUT VOLTAGE ( SENS (MAX16946 8.5V LDO CONFIGURATION) 200 I = 100mA OUT FB = REG 175 150 125 ...

Page 10

... LDO. Alternatively, externally drive LIM (not to exceed 3.65V) to set the current limit. Pin Configurations TOP VIEW OUT + OUT GND SENS 2 15 GND FB SHDN 3 14 GND MAX16947 REG GND 4 13 REG COMP 5 12 REF LIM LIM OLT OLT ...

Page 11

... The MAX16946 provides a regulated 8.5V output voltage fixed or adjustable from 3.3V to 15V. The MAX16946 can also be configured as a switch, while the MAX16947 is only available as a switch. The input voltage range for both devices extends from 4.5V to 18V (45V tolerant), ...

Page 12

Remote Antenna, Current-Sense and LDO/Switches The devices monitor the load current through an external sense resistor and perform the following actions the monitored current is lower than the set open- load current, the devices signal that there is ...

Page 13

Remote Antenna, Current-Sense and I LIM I SC LOAD CURRENT t BLANK SHDN SC Figure 1. Turn-On into Temporary Short Circuit I LIM I SC LOAD CURRENT t BLANK SHDN SC Figure 2. Turn-On into Hard Short Circuit ______________________________________________________________________________________ LDO/Switches ...

Page 14

Remote Antenna, Current-Sense and LDO/Switches I LIM I SC LOAD CURRENT t BLANK SHDN SC Figure 3. Turn-On into Temporary Heavy Load I LIM I SC LOAD CURRENT t BLANK SHDN SC Figure 4. Turn-On into Heavy Load 14 _____________________________________________________________________________________ ...

Page 15

... The switch turns on again after the device temperature drops by approximately +15NC (typ). Thermal shutdown is indicated AOUT. Undervoltage and Overvoltage Lockout The devices include undervoltage lockout circuitry (UVLO) to prevent erroneous switch operation when the Table 1. MAX16946/MAX16947 Status Truth Table V ( AOUT ...

Page 16

... Size R and  −  Ω × × 0.5 0.01A 26V/V+0.4V  = 470kI and calculate R as 100kI REF R MAX16946 1 MAX16947 LIM SENSE    and 1    ...

Page 17

... LIM(MAX) Figure 7. Adjustable Output-Voltage Selection LDO/Switches   V OUT 1  −  V   that the maximum input bias current at FB Compensation Capacitor Input Capacitor Output Capacitor OUT R MAX16946 ...

Page 18

Remote Antenna, Current-Sense and LDO/Switches Layout and Thermal Dissipation To optimize the switch response time to output short- circuit condition very important to keep all traces as short as possible to reduce the effect of undesirable parasitic inductance. ...

Page 19

... SUPPLY R PU ERROR FLAGS CURRENT- SENSE OUTPUT ON/OFF Figure 9. LDO with Fixed 8.5V Output BATTERY INPUT ERROR FLAGS CURRENT- SENSE OUTPUT () MAX16947 Figure 10. Input Switched to Output ______________________________________________________________________________________ R SENSE IN SENS OUT FB MAX16946 COMP REG REF LIM AOUT R 2 SHDN ...

Page 20

... Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. ...

Page 21

... Initial release 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 2010 Maxim Integrated Products © ...

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