MAX16946 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – Remote Antenna, Current-Sense and LDO/Switches

EVALUATION KIT AVAILABLE
MAX16946/MAX16947
Remote Antenna, Current-Sense and
LDO/Switches
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.
Ordering Information
PART
MAX16946GEE/V+**
MAX16946GTE/V+
MAX16947GEE/V+**
PIN-PACKAGE
16 QSOP-EP*
16 TQFN-EP*
16 QSOP
OUTPUT
Switch or LDO
Switch or LDO
Switch
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.
Features
S Switch Phantom Power-On/Off Under µC Control
S Precision Adjustable Current Limit
300mA (max), TA = +105NC
500mA (max), TA = +85NC (MAX16946 in SW
Mode Only)
S 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
Functional Diagram
IN
SENS
HIGH
VOLTAGE
AV =
26V/V
CHARGE PUMP AND GATE DRIVER
CURRENT
LIMIT COMP
OUT
FB
(GND)
COMP
LIM
AOUT
BUFFER
SHORT-TO
BATTERY
COMP
SC COMP
SC
SC REF
SHDN
REVERSE-
CURRENT
COMP
LOGIC
REVERSE
TIMER
CURRENT REF ^OSCILLATOR
MAX16946
MAX16947
OL COMP
OL
OLT
BANDGAP
REG
5V
REGULATOR
ULVO +
REFUV
OVLO
AND
THERMAL
BUFFER
REF
SHUTDOWN
IN
GND
REF
() MAX16947
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5575; Rev 1 6/13