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PDF MAX16914 Data sheet ( Hoja de datos )
| Número de pieza | MAX16914 | |
| Descripción | (MAX16914 / MAX16915) Overvoltage Protection Switch/Limiter Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX16914 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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19-4964; Rev 0; 9/09
Ideal Diode, Reverse-Battery, and Overvoltage Protection
Switch/Limiter Controllers with External MOSFETs
General Description
The MAX16914/MAX16915 low-quiescent-current over-
voltage and reverse-battery protection controllers are
designed for automotive and industrial systems that
must tolerate high-voltage transient and fault conditions.
These conditions include load dumps, voltage dips, and
reversed input voltages. The controllers monitor the input
voltage on the supply line and control two external pFETs
to isolate the load from the fault condition. The external
pFETs are turned on when the input supply exceeds
4.5V and stay on up to the programmed overvoltage
threshold. During high-voltage fault conditions, the con-
trollers regulate the output voltage to the set upper
threshold voltage (MAX16915), or switch to high resis-
tance (MAX16914) for the duration of the overvoltage
transient to prevent damage to the downstream circuitry.
The overvoltage event is indicated through an active-low,
open-drain output, OV.
The reverse-battery pFET behaves as an ideal diode,
minimizing the voltage drop when forward biased. Under
reverse bias conditions, the pFET is turned off, prevent-
ing a downstream tank capacitor from being discharged
into the source.
Shutdown control turns off the IC completely, discon-
necting the input from the output and disconnecting
TERM from its external resistor-divider to reduce the
quiescent current to a minimum.
Both devices are
www.DaatanSdhoeepte4Ura.cteomover
available in a 10-pin FMAXM package
the automotive -40NC to +125NC tem-
perature range.
Automotive
Industrial
Applications
Pin Configuration
TOP VIEW
+
VCC 1
GATE1 2
SENSE IN 3
SHDN 4
MAX16914
MAX16915
OV 5
10 GATE2
9 SENSE OUT
8 TERM
7 SET
6 GND
Features
S 4.5V to 19V Input Voltage Operation
S Transient Voltage Protection Up to +44V and -75V
S Adjustable Overvoltage Limit with Resistor-
Divider Shut Off in Shutdown
S Ideal Diode Reverse-Battery Protection
S Low Voltage Drop When Used with Properly Sized
External pFETs
S Back-Charge Prevention
S Overvoltage Indicator
S Shutdown Input
S 29µA Low Operating Current
S 6µA Low Shutdown Current
S Thermal-Overload Protection
S -40NC to +125NC Operating Temperature Range
S Small 10-Pin µMAX Package
S AEC-Q100 Qualified
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX16914AUB/V+ -40NC to +125NC
10 FMAX
MAX16915AUB/V+ -40NC to +125NC
10 FMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified device.
Typical Operating Circuit
VBATT
P1
P2 VOUT
ON
OFF
VCC MAX16914 GATE2
MAX16915
GATE1
SENSE OUT
SENSE IN
SHDN
OV
TERM
SET
GND
OV
R1
R2
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Ideal Diode, Reverse-Battery, and Overvoltage Protection
Switch/Limiter Controllers with External MOSFETs
Typical Operating Characteristics (continued)
(VCC = 14V, VSHDN = 14V, MAX16914/MAX16915 Evaluation Kit, TA = +25NC, unless otherwise noted.)
BACK-CHARGE RESPONSE
MAX16914 toc10
5V
5V
0V
1.0µs/div
2.2µF INPUT CAPACITOR, 400I
INPUT RESISTOR, 22µF OUTPUT CAPACITOR
VCC
5V/div
VOUT
5V/div
VGATE1
5V/div
VCC - VGATE_
vs. INPUT VOLTAGE
15.0
13.5
12.0
10.5 GATE1
9.0
7.5
6.0
4.5 GATE2
3.0
1.5
SET = GND
SHDN = HIGH
0
4.5 9.0 13.5 18.0 22.5 27.0 31.5 36.0 40.5 44.0
SUPPLY VOLTAGE (V)
GATE-DRIVE VOLTAGE
vs. TEMPERATURE
6.6
6.5 GATE1
6.4
GATE2
6.3
VCC = 14V
SET = GND
SHDN = HIGH
6.2
-40 -15 10 35 60 85
TEMPERATURE (NC)
110 125
PIN NAME
1 VCC
2 GATE1
3 SENSE IN
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4 SHDN
5 OV
6 GND
7 SET
8 TERM
9 SENSE OUT
10 GATE2
Pin Description
FUNCTION
Positive Supply Input Voltage. Bypass VCC to GND with a 0.1FF or greater ceramic capacitor.
Gate-Driver Output. Connect GATE1 to the gate of an external p-channel FET pass switch to pro-
vide low drain-to-source voltage drop, reverse voltage protection, and back-charge prevention.
Differential Voltage Sense Input (Input Side of IC). Used with SENSE OUT to provide back-charge
prevention when the SENSE IN voltage falls below the SENSE OUT voltage by 25mV.
Active-Low Shutdown/Wake Input. Drive SHDN high to turn on the voltage detectors. GATE2 is
shorted to VCC when SHDN is low. SHDN is internally pulled to GND through a 0.5FA current sink.
Connect SHDN to VCC for always-on operation.
Open-Drain Overvoltage Indicator Output. Connect a pullup resistor from OV to a positive supply
such as VCC. OV is pulled low when the voltage at SET exceeds the internal threshold.
Ground
Controller Overvoltage Threshold Programming Input. Connect SET to the center of an external
resistive divider network between TERM and GND to adjust the desired overvoltage switch-off or
limiter threshold.
Voltage-Divider Termination Output. TERM is internally connected to SENSE OUT in the MAX16915
and to VCC in the MAX16914. TERM is high impedance when SHDN is low, forcing the current to
zero in the resistor-divider connected to TERM.
Differential Voltage Sense Input (Output Side Of IC). Used with SENSE IN to provide back-charge
prevention when the SENSE IN voltage falls below the SENSE OUT voltage by 25mV.
Gate-Driver Output. Connect GATE2 to the gate of an external p-channel FET pass switch. GATE2
is driven low during normal operation and quickly regulated or shorted to VCC during an overvolt-
age condition. GATE2 is shorted to VCC when SHDN is low.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX16914.PDF ] | |
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