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MAX16946GTE/V+
Remote Antenna, Current-Sense and LDO/Switches
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
EVALUATION KIT AVAILABLE General Description
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.
Features
S Switch Phantom Power-On/Off Under µC ControlPrecision Adjustable Current Limit 300mA (max), TA = +105NC 500mA (max), TA = +85NC (MAX16946 in SW Mode Only)Regulated Output Voltage (MAX16946)—8.5V
Fixed or Adjustable Between 3.3V and 15V
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
Applications
Remote LNA Phantom Power
Automotive Safety and Infotainment
Automotive Remote Module Power
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.
Ordering Information
Functional Diagram
HIGH
VOLTAGE
SC COMP
SC REF
SHORT-TO
BATTERY
COMP
OL COMP
REVERSE-
CURRENT
COMP
CHARGE PUMP AND GATE DRIVER
SENS
AOUT
SHDN
REF
REG
GND
OUT
(GND)
COMP
CURRENT
LIMIT COMPAV =
26V/V
BUFFER
BUFFER
LIM
LOGIC
TIMER
OSCILLATOR
OLT
REF5V
REGULATOR
ULVO +
REFUVOVLO
BANDGAP
AND
THERMAL
SHUTDOWN
MAX16946
MAX16947REVERSE
CURRENT REF
PARTPIN-PACKAGEOUTPUT
MAX16946GEE/V+16 QSOP-EP*Switch or LDO
MAX16946GTE/V+16 TQFN-EP*Switch or LDO
MAX16947GEE/V+**16 QSOPSwitch
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
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.
SC, OL, REG to GND ...........................................-0.3V to +6.0V
OLT, LIM, FB, AOUT, REF,
COMP to GND .....................................-0.3V to (VREG + 0.3V)
IN, SENS, SHDN to GND ......................................-0.3V to +28V
IN, SENS, SHDN to GND (< 1s) ............................-0.3V to +45V
OUT to GND ..........................................................-0.3V to +20V
IN to SENS ............................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70NC)
QSOP (derate 9.5mW/NC above +70NC) .....................761mW
QSOP-EP (derate 22.7mW/NC above +70NC) ............1818mW
TQFN-EP (derate 25mW/NC above +70NC) .....................2000mW
Junction-to-Ambient Thermal Resistance (BJA) (Note 1)
QSOP .........................................................................105NC/W
QSOP-EP ......................................................................44NC/W
TQFN-EP ......................................................................40NC/W
Junction-to-Case Thermal Resistance (BJC) (Note 1)
QSOP ..........................................................................37NC/W
QSOP-EP ........................................................................6NC/W
TQFN-EP ........................................................................6NC/W
Operating Temperature Range ........................-40NC to +105NC
Junction Temperature ......................................-40NC to +150NC
Storage Temperature Range ............................-65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(VIN = 12V, VGND = 0V, TA = -40NC to +105NC, unless otherwise noted. Typical values are at TA = TJ = +25NC.)
ABSOLUTE MAXIMUM RATINGS
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-lay-
er board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SWITCH/LDO
IN Operating Supply RangeVIN
Full performance 4.518V
Output switched off (Note 2)28V
Output switched off for < 1s (Note 2)45V
IN Supply Current ICCV SHDN > 2.4V, TA = +25NC2.12.6mA
IN Shutdown Supply CurrentISDV SHDN = VGND, TA = +25NC, VIN = 12V7FA
Undervoltage Lockout
(Rising)VUVLO
Falling VIN3.5Rising VIN3.9
Hysteresis0.4
Internal Switch Voltage DropVSW
Measured between SENS and OUT while
sourcing 100mA, FB grounded, SW
operation, TA = +25NC, 4.5V < VIN < 18V
0.20V
Measured between SENS and OUT while
sourcing 100mA, FB grounded, SW
operation, TA = +105NC, 4.5V < VIN < 18V
(Note 2)
0.20.25V
Internal Voltage RegulatorVREGIREG = 0mA, TA = +25NC5V
Feedback Voltage VFB
MAX16946 only,
LDO mode with
FB connected to
external resistive
divider
IOUT = 5mA to
150mA, 4.5V P VIN P
18V
0.9711.03V
IOUT = 2mA to
200mA, 4.5V < VIN
0.9511.05V
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 12V, VGND = 0V, TA = -40NC to +105NC, unless otherwise noted. Typical values are at TA = TJ = +25NC.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Feedback Input Bias CurrentIFBVFB = 1.0V, LDO mode, TA = +25NC-0.5+0.5FAVFB = 1.0V, LDO mode, TA = +105NC0
Fixed 8.5V to LDO Mode
Feedback ThresholdVFB_THSwitching to LDO mode from fixed 8.5V3.34.2V
Adjustable Output Voltage
RangeVOUTLDO mode with external resistive divider,
VIN > VOUT + VDROPOUT (Note 3)3.315V
FB Load RegulationVIN - VOUT R 2V, IOUT = 5mA to 100mA,
LDO mode-2%
FB Line RegulationVIN - VOUT R 2V, IOUT = 6mA, LDO mode20mV/V
Fixed 8.5V Output VoltageVOUT_8.5VIOUT = 5mA, LDO mode with internal
resistive divider, 9V P VIN P 18V8.338.58.67V
Power-Supply Rejection
RatioPSRRVIN - VOUT R 2V, f = 100Hz, LDO mode50dB
Startup Response TimetSTSHDN rising to switch/LDO on, time
needed to charge CCOMP = 0.1FF10ms
OUT Pulldown Resistor ValueROUT_OFFV SHDN = VGND, TA = +25NC250kI
COMP Power-Down Resistor
ValueRCOMP_OFFV SHDN = VGND, TA = +25NC120kI
CURRENT-SENSE AMPLIFIER
AOUT GainAV
VAOUT/(VIN - VSENS), measured with
VIN - VSENS = 20mV and 100mV,
4.5V < VIN < 18V
25.352626.65V/V
Current-Sense Amplifier
Input Voltage RangeVINRDrop across the shunt resistor, normal
operation0125mV
AOUT Zero-Current Output
VoltageVAOUT_ZS(VIN - VSENS) = 0V, 4.5V < VIN < 18V0.3680.40.432V
Maximum AOUT VoltageVAOUT_FS(VIN - VSENS) = 125mV, if VLIM = VREF
then VAOUT(MAX) = 3V3.65V
AOUT Drive CapabilityIAOUT(VIN - VSENS) = 30mV1.0mA
AOUT Leakage CurrentIAOUT_LEAKV SHDN = VGND, TA = +25NC2FA
SENS Leakage CurrentISENS _LEAKV SHDN = VGND, TA = +25NC2FA
REFERENCE
REF Output VoltageVREF4.5V < VIN < 18V2.9433.06V
REF UndervoltageVREF_UVVREF falling2.182.72V
REF Output CurrentIREF100FA
REF Leakage CurrentIREF_LEAKV SHDN = VGND, TA = +25NC2FA
FAILURE DETECTION COMPARATORS
Open-Load Comparator
Input Common-Mode RangeVOLT_CMR(Note 2)0.41.7V
Open-Load Comparator
Offset VoltageVOLT_OSVOLT = 1.05V-400+40mV
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 12V, VGND = 0V, TA = -40NC to +105NC, unless otherwise noted. Typical values are at TA = TJ = +25NC.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
OLT Input Bias CurrentIOLTVOLT = 1.05V, TA = +25NC-0.5+0.5FAVOLT = 1.05V, TA = +105NC0
Initial Open-Load Blanking
TimetOLA switched open load is blanked for tOL100ms
Open-Load Glitch ImmunitytOL_GLITCHIOUT < IOL10100Fs
Current-Limit Comparator
Input Common-Mode RangeVLIM_CMRIf VLIM is derived from REF then maximum
voltage at LIM is 3V (Note 2)1.73.65V
Current-Limit Comparator
Input Offset VoltageVLIM_OSVLIM = 2.675V-800+80mV
LIM Input Bias Current ILIM_BIASVLIM = 2.675V, TA = +25NC-0.5+0.5FAVLIM = 2.675V, TA = +105NC0
Short-Circuit AOUT Voltage
ThresholdVSC
Rising VAOUT at which the SC output
asserts low, hysteresis of 40mV,
4.5V < VIN < 18V
1.651.71.75V
Short-Circuit Current
Blanking TimetBLANKIOUT > ISC100ms
Delay Time Before Retry
After Short-Circuit Current
Turn-Off
tRETRYIOUT > ISC1100ms
IN Overvoltage Lockout
ThresholdVOVLOVIN rising, hysteresis = 0.5V (typ)192123V
Short-to-BAT Threshold in
Off-StateVOUT_BATShort to battery detected when VOUT - VIN
> VOUT_BAT0250500mV
Reverse-Current Detection
LevelVREV
Power switch on (SW or LDO mode), VREV
= VIN - VSENS, VREV = -9.6mV produces
VAOUT = 150mV, VREV = -5.7mV
produces VAOUT = 250mV
-9.6-5.7mV
Reverse-Current Shutdown
Time tSD_REVDelay to shut down switch or LDO after
VREV exceeds -7.7mV (typ), TA = +25NC5Fs
Feedback Voltage Out of
RangeVFB_ERRLDO mode1.121.28V
Reverse-Current Blanking
Time for Short-Circuit EventstREV_BLANKSwitching on and off into a temporary load
(short-circuit events)16ms
OVERTEMPERATURE PROTECTION
Thermal Shutdown ThresholdTSHDN+170NC
Thermal Shutdown
HysteresisTHYST15NC
LOGIC
SC, OL Output-Voltage LowVOLSinking current = 1mA0.4V
SC, OL Open-Drain Leakage
Current
ISC_LEAK,
IOL_LEAK
SC, OL not asserted, VSC = VOL = 5V,
TA = +25NC1FA
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
Note 2: Guaranteed by design and not production tested.
Note 3: VDROPOUT is voltage from VIN to VOUT and includes drop across the sense resistor and internal power FET. Additionally,
VOUT + VDROPOUT < VOVLO(MIN) = 19V.
Typical Operating Characteristics
(VIN = 14V, RSENSE = 0.5ω, TA = +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 12V, VGND = 0V, TA = -40NC to +105NC, unless otherwise noted. Typical values are at TA = TJ = +25NC.)
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX16946 toc06
VIN (V)
IIN
(µA)14121086
FB = GND
SHDN = 0
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX16946 toc05
TEMPERATURE (°C)
IIN (µA)
FB = GND
SHDN = 0VIN = 18V
VIN = 14V
VIN = 12V
VIN = 4.5V
OPERATING SUPPLY CURRENT vs. SUPPLY VOLTAGE
(MAX16964/MAX16947 SWITCH CONFIGURATION)
MAX16946 toc04
VIN (V)
IIN
(mA)14681012
OPERATING SUPPLY CURRENT vs. TEMPERATURE
(MAX16946/MAX16947 SWITCH CONFIGURATION)
MAX16946 toc03
TEMPERATURE (°C)
IIN
(mA)
OPERATING SUPPLY CURRENT vs. TEMPERATURE
(MAX16946 8.5V LDO CONFIGURATION)
MAX16946 toc02
TEMPERATURE (°C)
IIN
(mA)
FB = REG
SENSE LEAKAGE CURRENT
vs. TEMPERATURE
MAX16946 toc01
TEMPERATURE (°C)
ISENS
(nA)
FB = GND
SHDN = 0
VIN = 12V
VIN = 4.5V
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SHDN Input-Voltage HighVSHDN_HI2.7V
SHDN Input-Voltage LowVSHDN_LO0.8V
SHDN Input CurrentISHDNVSHDN > 6V5FA
SHDN Off-TimetSHDN_OFF150256420Fs
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
Typical Operating Characteristics (continued)
(VIN = 14V, RSENSE = 0.5ω, TA = +25°C, unless otherwise noted.)
DROPOUT VOLTAGE vs. LOAD CURRENT
(SWITCHED OUTPUT)
MAX16946 toc07
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
TA = -40°C
TA = +125°C
TA = +25°C
DROPOUT VOLTAGE vs. LOAD CURRENT
(OUTPUT = 5V)
MAX16946 toc08
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
TA = -40°C
TA = +105°C
TA = +25°C
DROPOUT VOLTAGE vs. LOAD CURRENT
(OUTPUT = 8.5V)
MAX16946 toc09
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
TA = -40°C
TA = +105°C
TA = +25°C
DROPOUT VOLTAGE vs. SUPPLY VOLTAGE
(SWITCHED OUTPUT)
MAX16946 toc10
SUPPLY VOLTAGE (V)
DROPOUT VOLTAGE (mV)14121086
IOUT = 90mA
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX16946 toc11
TEMPERATURE (°C)
OUT
(V)
VIN = 10V
VOUT = 5V
IOUT = 90mA
IOUT = 50mA
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX16946 8.5V LDO CONFIGURATION)
MAX16946 toc12
TEMPERATURE (°C)
OUT
(V)
VIN = 12V
FB = REG
IOUT = 50mA
IOUT = 90mA
REF OUTPUT VOLTAGE
vs. TEMPERATURE
MAX16946 toc13
REF
(V)
IREF = 100µA
FB = REG
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX16946 toc14
PSRR (dB)
10k1k100
-100100k
IOUT = 5mA
IOUT = 50mA
VOUT = 3.3V
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX16946 toc15
PSRR (dB)
10k1k100
-100100k
IOUT = 5mA
IOUT = 50mA
VOUT = 8.5V
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
Typical Operating Characteristics (continued)
(VIN = 14V, RSENSE = 0.5ω, TA = +25°C, unless otherwise noted.)
LOAD TRANSIENT RESPONSE
(5V LDO MODE)
MAX16946 toc16
IOUT
50mA/div
VOUT
(AC-COUPLED)
500mV/div
100µs/div
LINE TRANSIENT RESPONSE
(5V LDO MODE)
MAX16946 toc17
VIN
5V/div
VOUT
(AC-COUPLED)
200mV/div
4ms/div
POWER-UP WAVEFORMS
(VOUT = 8.5V, IOUT = 90mA)
MAX16946 toc18
IOUT
100mA/div
VOUT
5V/div
VIN
5V/div
2ms/div
POWER-UP WAVEFORMS
(SW MODE, IOUT = 90mA)
MAX16946 toc19
IOUT
100mA/div
VOUT
5V/div
VIN
5V/div
2ms/div
STARTUP WAVEFORMS
(VOUT = 8.5V, IOUT = 90mA)
MAX16946 toc20
IOUT
100mA/div
VOUT
5V/div
VSHDN
5V/div
STARTUP WAVEFORMS
(SW MODE, IOUT = 90mA)
MAX16946 toc21
IOUT
100mA/div
VOUT
5V/div
VSHDN
5V/div
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
Typical Operating Characteristics (continued)
(VIN = 14V, RSENSE = 0.5ω, TA = +25°C, unless otherwise noted.)
HIGH-VOLTAGE LINE TRANSIENT RESPONSE
(MAX16947)
MAX16946 toc22
VIN
20V/div
VOUT
10V/div
IOUT
50mA/div
VAOUT
1V/div
45V
14V
100ms/div
AOUT GAIN
vs. TEMPERATURE
MAX16946 toc23
TEMPERATURE (°C)
(V/V)
VIN - VSENS = 20mV AND 100mV
CURRENT-SENSE AMPLIFIER GAIN
vs. TEMPERATURE
MAX16946 toc24
TEMPERATURE (°C)
GAIN (V/V)80-25-10535502065
OVERCURRENT BLANKING TIME
vs. TEMPERATURE
MAX16946 toc25
TEMPERATURE (°C)
tBLANK
(ms)
FB = GND
OVERCURRENT BLANKING TIME
vs. SUPPLY VOLTAGE
MAX16946 toc26
tBLANK
(ms)14121086
FB = GND
DROPOUT VOLTAGE (VSENS - VOUT) vs. TEMPERATURE
(MAX16946 SWITCH CONFIGURATION)
MAX16946 toc27
SENS
- V
OUT
(mV)
IOUT = 100mA
FB = GND
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
Typical Operating Characteristics (continued)
(VIN = 14V, RSENSE = 0.5ω, TA = +25°C, unless otherwise noted.)
DROPOUT VOLTAGE (VSENS - VOUT) vs. TEMPERATURE
(MAX16946 8.5V LDO CONFIGURATION)
MAX16946 toc28
TEMPERATURE (°C)
SENS
- V
OUT
(mV)
IOUT = 100mA
FB = REG
OPEN-LOAD FAULT
(VOUT = 8.5V, IOUT = 50mA)
MAX16946 toc29
IOUT
50mA/div
VOUT
5V/div
100µs/div
VDL
5V/div
CLEARING OPEN-LOAD FAULT
(VOUT = 8.5V, IOUT = 50mA)
MAX16946 toc30
IOUT
50mA/div
VOUT
5V/div
100µs/div
VSHDN
5V/div
VDL
5V/div
Remote Antenna, Current-Sense and
LDO/Switches
MAX16946/MAX16947
Pin Configurations
Pin Description
SHDN
GND
OLTGNDREF109
GND
OUT
AOUT
COMP
SENS
LIM
REG
TQFNTOP VIEW
REGGND
OUT
GNDSENS
SHDN
QSOP
TOP VIEW
LIM
OLTOL
512REFCOMP6
GNDAOUT89OUT
GND
GND
REG
REF
LIM
OLT
GND
TOP VIEW
QSOP
SENS
SHDN
GND
COMP
AOUT
MAX16947
MAX16946
MAX16946
PINNAMEFUNCTIONMAX16946MAX169471INInput Voltage. Bypass IN to GND with a low-ESR ceramic capacitor with a minimum
value of 0.1FF.2SENSCurrent-Sense Amplifier Input. Connect the sense resistor between SENS and IN.3SHDN
Active-Low Shutdown Input. Drive SHDN low for more than 360Fs to turn off the device.
Pulsing SHDN low for less than tSHDN_OFF clears the OL output. SHDN is high-voltage
compatible and is connected to IN for normal operation.
4, 9, 154, 9, 14, 15GNDGround5COMPLDO Compensation. Connect a 0.1FF ceramic capacitor between COMP and GND to
compensate the LDO. 6SC
Open-Drain Short-Circuit Indicator Output. SC goes low when the load current is greater
than the set short-circuit current threshold or when there is a short-to-battery fault.
Connect SC to a 10kI pullup resistor. See Table 1.7OL
Open-Drain Open-Load Indicator Output. OL goes low when the load current is lower
than the set open-load current threshold or when there is a short-to-battery fault. Connect
OL to a 10kI pullup resistor. See Table 1.8AOUT
Current Monitor Voltage Output. AOUT can be used to measure the load current by
means of an external ADC. AOUT has a current drive capability of 1mA. Bypass AOUT to
GND with a 15nF ceramic capacitor. See Table 1.10OLTOpen-Load Current Threshold Setting Input. A resistive divider between REF, OLT, and
GND sets the open-load current threshold.11LIM
Current-Limit Setting input. Connect a resistive divider from REF, LIM, and GND to set
the current limit of the switch or LDO. Alternatively, externally drive LIM (not to exceed
