Manual

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General Description

The MAX16913/MAX16913A high-voltage high-side

current-sense switches feature internal current limiting

to prevent system damage due to fault conditions. The

MAX16913/MAX16913A input voltage range extends

from 5V to 18V, making them ideal for providing phan-

tom power to remote radio-frequency low-noise ampli-

fiers (LNAs) in automotive applications.

The MAX16913/MAX16913A monitor the load current

and provide an analog output voltage proportional to

the sensed load current. In addition to current sensing,

accurate internal current-limiting circuitry protects the

input supply against both overload and short-circuit

conditions. Two open-drain fault indicator outputs notify

the microprocessor when a short circuit, an open-load

condition, or a short-to-battery condition exists. For the

MAX16913A, the open-load threshold is externally

adjustable using a resistive divider.

A fault-blanking feature enables the circuit to ignore

momentary faults, such as those caused by the initial

charging of a capacitive load when hot swapping,

preventing false alarms to the system. Built-in thermal-

overload protection turns off the switch when the die

temperature exceeds +150°C (min). The MAX16913/

MAX16913A also feature a short-to-battery detection

every time the internal switch turns on. These devices

provide an active-high control input to put the devices

in low-power shutdown mode.

The MAX16913/MAX16913A are available in the 16-pin

QSOP package and operate over the -40°C to +105°C

temperature range.

Applications

Remote LNA Phantom Power

Automotive Safety and Infotainment

Features

♦ Switch Phantom Power-On/-Off Under µC Control

♦ Analog Current Measurement Output

♦ Adjustable Current Limiting (340mA Maximum)

♦ Detect Open-Load and Short-Circuit Conditions

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

♦ Overcurrent Blanking During Startup

♦ Thermal Shutdown

♦ AEC-Q100 Qualified (/V Versions Only)

♦ -40°C to +105°C Operating Temperature Range

MAX16913/MAX16913A

Remote Antenna Current-Sense

Amplifier and Switches

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4186; Rev 0; 7/08

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.

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

/V denotes an automotive qualified part.

EVALUATION KIT

AVAILABLE

PA R T

T EM P

R A N G E

PIN -

PA C K A G E

O PEN - L O A D

T H R ESH O L D

M A X1 6 9 1 3 G E E +

- 40°C to

+ 105° C

16 QS OP Inter nal l y S et

M AX 16913GE E /V + *

- 40°C to

+ 105° C

16 QS OP Inter nal l y S et

M A X1 6 9 1 3 A G E E +

- 40°C to

+ 105° C

16 QS OP

E xter nal l y

Ad j ustab l e

M AX 16913AG E E /V + *

- 40°C to

+ 105° C

16 QS OP

E xter nal l y

Ad j ustab l e

Pin Configuration appears at end of data sheet.

Typical Operating Circuits

MAX16913

GND

OLT

SHDN

SENS

BATTERY

INPUT

AOUT

TO ADC INPUT

OUT

PROTECTED

LOAD (LNA)

3.3V TO 5V

MAX16913A

REF

GND

OLT

SHDN

SENS

BATTERY

INPUT

AOUT

TO ADC INPUT

OUT

PROTECTED

LOAD (LNA)

3.3V TO 5V

Summary of content (10 pages)

PAGE 1
9-4186; Rev 0; 7/08 KIT ATION EVALU E L B AVAILA Remote Antenna Current-Sense Amplifier and Switches Features The MAX16913/MAX16913A high-voltage high-side current-sense switches feature internal current limiting to prevent system damage due to fault conditions. The MAX16913/MAX16913A input voltage range extends from 5V to 18V, making them ideal for providing phantom power to remote radio-frequency low-noise amplifiers (LNAs) in automotive applications.
PAGE 2
MAX16913/MAX16913A Remote Antenna Current-Sense Amplifier and Switches ABSOLUTE MAXIMUM RATINGS IN to GND ............................................….…………-0.3V to +42V OUT to GND ...........................................................-0.3V to +42V SENS to IN.............................................................-0.3V to +0.3V SC, OL, SHDN, OLT, AOUT to GND..................…-0.3V to +6.0V Current into Any Pin Except OUT and SENS....................±20mA Current into SENS and OUT ...............
PAGE 3
Remote Antenna Current-Sense Amplifier and Switches (VIN = +9V to +18V, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC LEVELS SC, OL Output-Voltage Low VOL SC, OL Output-Leakage Current Sink current = 1mA ILEAK SHDN Input Low Voltage VIL SHDN Input High Voltage VIH 0.4 VSC = VOL = 5V V 0.01 µA 0.4 V 1.
PAGE 4
Typical Operating Characteristics (continued) (VIN = 14V, RSENSE = 1Ω, TA = +25°C, unless otherwise noted.) 250 250 200 1 0 20 30 40 50 60 70 80 150 90 100 150 100 100 50 50 0 -40 -1 10 200 tBLANK (ms) tBLANK (ms) 2 MAX16913/3A toc09 3 300 MAX16913/3A toc08 300 MAX16913/3A toc07 4 OVERCURRENT BLANKING TIME vs. VIN OVERCURRENT BLANKING TIME vs. TEMPERATURE TOTAL CURRENT MEASUREMENT ERROR vs.
PAGE 5
Remote Antenna Current-Sense Amplifier and Switches PIN NAME FUNCTION 1, 8, 9, 16 GND 2 IN 3, 4 SENS Input to Current-Sense Amplifier. Connect the sense resistor between SENS and IN. 5, 6 OUT Switch Output 7 SHDN 10 N.C. No Connection. Not internally connected. 11 OLT Open-Load Threshold Setting Input. A resistive divider between REF, OLT, and GND sets the open-load current threshold (MAX16913A). For the MAX16913, connect OLT to GND. 12 REF +3V Nominal Reference Output.
PAGE 6
MAX16913/MAX16913A Remote Antenna Current-Sense Amplifier and Switches Detailed Description The MAX16913/MAX16913A high-voltage, high-side, current-sense switches feature internal current limiting to prevent system damage due to fault conditions. The MAX16913/MAX16913A input voltage range extends from 5V to 18V, making them ideal for providing phantom power to remote radio-frequency low-noise amplifiers (LNAs) in automotive applications.
PAGE 7
Remote Antenna Current-Sense Amplifier and Switches MAX16913/MAX16913A TURN-ON INTO A HARD SHORT CIRCUIT 2 x ISC ISC LOAD CURRENT tBLANK tRETRY RETRY SHDN SC TURN-ON INTO A TEMPORARY SHORT CIRCUIT 2 x ISC ISC LOAD CURRENT tBLANK tRETRY RETRY SHDN SC Figure 1. Short-Circuit Timing Diagram switch is zero (see Figure 1). If the load current is greater than ISC, but does not reach the 2 x ISC threshold, the tBLANK timer still begins counting (see Figure 2).
PAGE 8
MAX16913/MAX16913A Remote Antenna Current-Sense Amplifier and Switches TURN-ON WITH A HEAVY LOAD 2 x ISC ISC tBLANK LOAD CURRENT tRETRY RETRY SHDN SC TURN-ON INTO A TEMPORARY HEAVY LOAD 2 x ISC ISC tBLANK LOAD CURRENT tRETRY RETRY SHDN SC Figure 2. Overcurrent Timing Diagram Undervoltage and Overvoltage Lockout The MAX16913/MAX16913A include undervoltage circuitry (UVLO) to prevent erroneous switch operation when the input voltage goes below approximately 4.
PAGE 9
Remote Antenna Current-Sense Amplifier and Switches Choosing the Sense Resistor Ideally, the maximum load current develops the fullscale sense voltage across the current-sense resistor. The current-sense amplifier output voltage is given by: REF R1 MAX16913 OLT VAOUT (V) = [(VIN - VSENS)(V) x AV(V/V)] + 0.4(V) where VAOUT is the output voltage of the current-sense amplifier, and AV is the gain of the current-sense amplifier of 13V/V (typ).
PAGE 10
MAX16913/MAX16913A Remote Antenna Current-Sense Amplifier and Switches IN and OUT must be connected with wide short traces to the power bus. During normal operation, the power dissipation is small and the package temperature change is minimal.