INFINEON TLF4277

Data Sheet, Rev. 1.0, May 2009
TLF4277
Low Drop Out Linear Voltage Regulator
Integrated Current Monitor
Automotive Power
TLF4277
Table of Contents
Table of Contents
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
3.1
3.2
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
4.1
4.2
4.3
General Product Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5.1
5.2
5.3
5.4
Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Description Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Characteristics Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application Information for the setting the variable output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical Performance Characteristics Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
6.1
6.2
Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electrical Characteristics Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Typical Performance Graphs Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7
7.1
7.1.1
7.1.2
7.1.3
7.1.4
7.2
Current and Protection Monitor Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description Current and Protection Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Linear Current Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustable Output Current Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overvoltage Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Shutdown Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics Current and Protection Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
8.1
8.2
Enable Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Description Enable Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical Characteristics Enable Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9
9.1
Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Measurement Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10
Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Data Sheet
2
6
6
7
7
14
14
15
16
16
16
17
Rev. 1.0, 2009-05-07
Low Drop Out Linear Voltage Regulator
Integrated Current Monitor
1
TLF4277
Overview
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Integrated Current Monitor
Adjustable Current Limitation
Adjustable Output Voltage
Overvoltage Detection
Output Current up to 200 mA
Very Low Current Consumption
Very Low Dropout Voltage
Wide Input Voltage Range up to 40 V
Reverse Polarity Protection
Short Circuit Protected
Overtemperature Shutdown
Automotive Temperature Range -40 °C ≤ Tj ≤ 150 °C
Green Product (RoHS and WEEE compliant)
AEC Qualified
PG-SSOP14 EP
Description
The TLF4277 is the ideal companion IC to supply active antennas for car infotainment applications. The adjustable
output voltage makes the TLF4277 capable of supplying the majority of standard active antennas such as:
•
•
•
•
FM/AM
DAB
XM
SIRIUS
The TLF4277 is a monolithic integrated low drop out voltage regulator capable of supplying loads up to 200 mA.
For an input voltage up to 40 V the TLF4277 provides an adjustable output voltage in a range from 5 V up to 12 V.
The integrated current monitor function is a unique feature that provides diagnosis and system protection
functionality. Fault conditions such as overtemperature and output overvoltage are monitored and indicated at the
current sense output. The maximum output current limit of the device is adjustable to provide additional protection
to the connected load.
Via the enable function the IC can be disabled to lower the power consumption. The PG-SSOP14 EP package
provides an enhanced thermal performance within a SO8 body size.
Type
Package
Marking
TLF4277EL
PG-SSOP14 EP
TLF4277
Data Sheet
3
Rev. 1.0, 2009-05-07
TLF4277
Block Diagram
2
Block Diagram
R SHUNT
VBAT
RCS 1
CS1
I
CS2
TLF4277
Internal
Supply
CI
Bandgap
Reference
ADJ
Current
Monitor
EN
Regulated
Output Voltage
Q
Load
E.g.
Antenna
Amplifier
CQ
Protection circuits
B lockDiagram .vsd
CSO
Figure 1
Data Sheet
GND
CSO
R SO
Block and simplified application diagram TLF4277 (Package PG-SSOP14 EP)
4
Rev. 1.0, 2009-05-07
TLF4277
Pin Configuration
3
Pin Configuration
3.1
Pin Assignment
&6
1&
4
1&
&6
$'-
1&
1&
,
*1'
1&
1&
&62
(1
7/)B3,1&21),*B662369*
Figure 2
Pin Configuration (top view)
3.2
Pin Definitions and Functions
Pin
Symbol
Function
1
CS2
Current Sense In 2
current monitor and power stage input
3
CS1
Current Sense In 1
current monitor input
5
I
IC Supply
Place a capacitor from I (Pin 5) to GND close to the IC for compensating line
influences.
7
CSO
Current Sense Out
current monitor and status output
8
EN
Enable
high signal enables the regulator;
low signal disables the regulator;
connect to I, if the Enable function is not needed
10
GND
Ground
connect pin to PCB and heat sink area
12
ADJ
Voltage Adjust
connect an external voltage divider to configure the output voltage
14
Q
Regulator Output
connect a capacitor between Q (Pin 8) and GND close to the IC pins, respecting the
values given for its capacitance CQ and ESR in the table Chapter 4.2
PAD
Heat sink
connect to PCB heat sink area and GND
2,4,6
NC
Not Connected
Internally not connected; Connect to PCB GND
9,11,13
NC
Not Connected
Internally not connected; Connect to PCB GND
Data Sheet
5
Rev. 1.0, 2009-05-07
TLF4277
General Product Characteristics
4
General Product Characteristics
4.1
Absolute Maximum Ratings
Absolute Maximum Ratings 1)
Tj = -40 °C to +150 °C; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Unit
Conditions
Min.
Max.
VI
VEN
VADJ
VQ
VCS1
VCS2
VCSO
-42
45
V
–
-42
45
V
–
-0.3
10
V
–
-1
40
V
–
-42
45
V
–
-42
45
V
–
-0.3
5
V
–
Tj
Tstg
-40
150
°C
–
-55
150
°C
–
VESD
VESD
-2
2
kV
HBM2)
-1
1
kV
CDM3)
Voltage Ratings
4.1.1
IC Supply I
4.1.2
Enable Input EN
4.1.3
Voltage Adjust Input ADJ
4.1.4
Regulator Output Q
4.1.5
Current Monitor Input CS1
4.1.6
Current Monitor Input CS2
4.1.7
Current Monitor Out CSO
Temperatures
4.1.8
Junction Temperature
4.1.9
Storage Temperature
ESD Susceptibility
4.1.10
ESD Resistivity to GND
4.1.11
ESD Resistivity
1) Not subject to production test, specified by design.
2) ESD susceptibility, HBM according to AEC-Q-100-002-JESD22-A114
3) ESD susceptibility, Charged Device Model “CDM” ESDA STM5.3.1
Note: Integrated protection functions are designed to prevent IC destruction under fault conditions described in the
data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are
not designed for continuous repetitive operation.
Note: Stresses above the ones listed her may cause permanent damage to the device. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Data Sheet
6
Rev. 1.0, 2009-05-07
TLF4277
General Product Characteristics
4.2
Pos.
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.2.10
Functional Range
Parameter
Symbol
VI
Input Voltage Power Stage
VCS2
Differential Input Voltage
VSHUNT
Output Voltage Range
VQ
Reference Resistor
RCS1
Current Sense Output Resistor RCSO
Current Sense Output Capacitor CCSO
Junction Temperature
Tj
Output Capacitor Requirements CQ
ESRCQ
Input Voltage
Limit Values
Unit Conditions
Min.
Max.
5
40
V
–
VQ + 0.5 40
V
0
0.5
V
VQ = VCS2 - Vdr
VSHUNT = VCS1 - VCS2
5
12
V
–
100
1000
Ω
–
1k
5k
Ω
–
1
4.7
µF
–
-40
150
°C
–
10
–
µF
–1)
–
3
Ω
–2)
1) The minimum output capacitance requirement is applicable for a worst case capacitance tolerance of 30%
2) Relevant ESR value at f = 10 kHz
Note: Within the functional range the IC operates as described in the circuit description. The electrical
characteristics are specified within the conditions given in the related electrical characteristics table.
4.3
Pos.
Thermal Resistance
Parameter
Symbol
Limit Values
Unit
Conditions
Min.
Typ.
Max.
RthJC
–
–
10
K/W
measured to the
exposed pad
RthJA
–
150
–
K/W
Footprint only2)
4.3.3
–
64
–
K/W
300 mm2 PCB
heat sink area2)
4.3.4
–
55
–
K/W
600 mm2 PCB
heat sink area2)
4.3.5
–
50
–
K/W
2s2p PCB3)
1)
4.3.1
Junction to Case...
4.3.2
Junction to Ambient 1)
1) Not subject to production test, specified by design
2) Specified RthJA value is according to Jedec JESD 51-3 at natural convection on FR4 1s0p board; The Product
(Chip+Package) was simulated on a 76.2 × 114.3 × 1.5 mm3 board with 1 copper layer (1 x 70µm Cu).
3) Specified RthJA value is according to Jedec JESD51-2,-5,-7 at natural convection on FR4 2s2p board; The Product
(Chip+Package) was simulated on a 76.2 x 114.3 x 1.5 mm³ board with 2 inner copper layers (2 x 70µm Cu, 2 x 35µm Cu).
Where applicable a thermal via array under the exposed pad contacted the first inner copper layer.
Data Sheet
7
Rev. 1.0, 2009-05-07
TLF4277
Voltage Regulator
5
Voltage Regulator
5.1
Description Voltage Regulator
The output voltage VQ is controlled by comparing the feedback voltage (VADJ) to an internal reference voltage and
driving a PNP pass transistor accordingly. The control loop stability depends on the output capacitor CQ, the output
capacitor ESR, the load current and the chip temperature. To ensure stable operation, the output capacitor’s
capacitance and its equivalent series resistor ESR requirements given in the Table 4.2 “Functional Range” on
Page 7 have to be maintained. For stability details please refer to the typical performance graph “Output Capacitor
Series Resistivity ESRCQ” on Page 11. In addition the output capacitor may need to be sized larger to buffer load
transients.
An input capacitor CI is not needed for the control loop stability, but recommended to buffer line influences.
Connect the capacitors close to the IC terminals. In general a buffered supply voltage is recommended for the
device. For details see Chapter 9.
Protection circuitry prevents the IC as well as the application from destruction in case of catastrophic events. The
integrated safeguards consist of output current limitation, reverse polarity protection as well as thermal shutdown
in case of overtemperature.
In order to avoid excessive power dissipation that could never be handled by the pass element and the package,
an integrated safe operation monitor lowers the maximum output current input voltages above VBAT = 22 V.
The thermal shutdown circuit prevents the IC from immediate destruction under fault conditions (e.g. output
continuously short-circuited) by switching off the power stage. After the chip has cooled down, the regulator
restarts. This leads to an oscillatory behavior of the output voltage until the fault is removed. However, junction
temperatures above 150 °C are outside the maximum ratings and therefore significantly reduce the IC lifetime.
The TLF4277 allows a negative supply voltage. However, several small currents are flowing into the IC increasing
its junction temperature. This reverse current has to be considered for the thermal design, respecting that the
thermal protection circuit is not operating during reverse polarity condition.
ICS2
CS2
Q
Regulated
Output Voltage
IQ
R1
Saturation Control
Current Limitation
ADJ
CQ
LOAD
Temperature
Shutdown
BlockDiagram_VoltageRegulator.vsd
Figure 3
Data Sheet
Bandgap
Reference
R2
GND
Block Diagram Voltage Regulator Circuit
8
Rev. 1.0, 2009-05-07
TLF4277
Voltage Regulator
5.2
Electrical Characteristics Voltage Regulator
Electrical Characteristics: Voltage Regulator
VBAT = 13.5 V, Tj = -40 °C to +150 °C, all voltages with respect to ground, direction of currents as shown in Figure 7
“Measuring Circuit” on Page 19 (unless otherwise specified)
Pos.
Parameter
Symbol
5.2.1
Reference Voltage
VREF,int
VQ
Limit Values
Unit
Conditions
Min.
Typ.
Max.
–
1.22
–
V
1)
-2
–
2
%
1 mA ≤ IQ ≤ 200 mA;
9 V ≤ VBAT ≤ 16 V
5.2.3
-2
–
2
%
1 mA ≤ IQ ≤ 150 mA;
6 V ≤ VBAT ≤ 16 V
5.2.4
-2
–
2
%
1 mA ≤ IQ ≤ 100 mA;
16 V ≤ VBAT ≤ 32 V3)
5.2.5
-2
–
2
%
1 mA ≤ IQ ≤ 10 mA;
32 V ≤ VBAT ≤ 45 V3)
IQ = 1 mA to 150 mA;
VBAT = 6 V
VQ = 5 V
VBAT = 6 V to 32 V;
IQ = 5 mA
VQ = 5 V
fripple = 100 Hz;
Vripple = 1 Vpp
IQ = 50 mA4)
IQ = 150 mA4)
0 V ≤ VQ ≤ 0.95 * VQ,nom;
5.2.2
Output Voltage Tolerance
2)
5.2.6
Load Regulation
steady-state
dVQ,load
-30
-5
–
mV
5.2.7
Line Regulation
steady-state
dVQ,line
–
5
20
mV
5.2.8
Power Supply Ripple
Rejection1)
PSRR
60
65
–
dB
5.2.9
Dropout Voltage
Vdr
–
120
250
mV
5.2.10
Vdr = VCS2 - VQ
–
250
500
mV
5.2.11
Output Current Limitation
IQ,max
300
–
600
mA
–
CSO pin connected to
GND
5.2.12
Reverse Current
IQ
-2
-1
–
mA
5.2.13
Reverse Current
at Negative Input Voltage
IBAT
-10
-6
–
mA
5.2.14
Overtemperature Shutdown
Threshold
Tj,sd
151
–
200
°C
VBAT = VCS2 = 0 V;
VQ = 5 V
VBAT = -16 V;
VQ = 0 V
Tj increasing1)
5.2.15
Overtemperature Shutdown
Threshold Hysteresis
Tj,hy
–
25
–
K
Tj decreasing1)
1)
2)
3)
4)
Parameter not subject to production test; specified by design.
Referring to the device tolerance only, the tolerance of the resistor divider can cause additional deviation.
See typical performance graph for details.
Measured when the output voltage VQ has dropped 100 mV from its nominal value.
Data Sheet
9
Rev. 1.0, 2009-05-07
TLF4277
Voltage Regulator
5.3
Application Information for the setting the variable output voltage
The output voltage of the TLF4277 can be adjusted between 5 V and 12 V by an external output voltage divider,
closing the control loop to the voltage adjust pin ADJ.
The voltage at pin ADJ is compared to the internal reference of typical 1.22 V in an error amplifier. It controls the
output voltage.
Q
IQ
R1
Saturation Control
Current Limitation
ADJ
CQ
Bandgap
Reference
GND
BD_VoltageRegulator _Adjust.vsd
Figure 4
R2
Application Detail External Components at Output for Variable Voltage Regulator
The output voltage is calculated according to Equation (1):
VQ = (R1 + R2)/R2 x VREF,int, neglecting IADJ
(1)
VREF,int is typically 1.22 V.
To avoid errors caused by leakage current IADJ, we recommend to choose the resistor value for R2 < 27 kΩ.
The accuracy of the resistors for the external voltage divider can lead to a higher tolerance of the output voltage.To
achieve a reasonable accuracy resistors with a tolerance of 1% or lower are recommended for the feedback
divider.
Data Sheet
10
Rev. 1.0, 2009-05-07
TLF4277
Voltage Regulator
5.4
Typical Performance Characteristics Voltage Regulator
Reference Voltage VREF,int vs.
Junction Temperature Tj
Output Capacitor Series Resistivity ESRCQ
vs. Output Current IQ
V ref_Tj. v s d
1.23
E S R-IQ .v s d
100
ESR(C Q)[Ω]
Vref,int [V]
Unstable
Region
10
1.22
Stable
Region
1
1.21
C Q = 10 µF
0,1
T j = -40 ..150 °C
V I = 6..28 V
1.20
-40
0 ,01
0
40
80
120
150
TJ [°C]
50
100
150
200
IQ [mA]
Dropout Voltage Vdr vs.
Output Current IQ
Power Supply Ripple Rejection PSRR
P S RR. v s d
100
V dr-Tj .v s d
300
Vdr [mV ]
0
T j = -40 °C
PSRR [dB]
I Q = 150 mA
T j = 25 °C
T j = 150 °C
70
200
I Q= 50 mA
50
150
100
30
I Q = 10 mA
C Q = 10 µF
ceramic
50
V I = 13. 5 V
10
-40
0
40
80
120
150
0,01
T J [°C]
Data Sheet
V ripple = 0.5 Vpp
0,1
1
10
100
f [kHz]
11
Rev. 1.0, 2009-05-07
TLF4277
Current Consumption
6
Current Consumption
6.1
Electrical Characteristics Current Consumption
Electrical Characteristics: Current Consumption
VBAT = 13.5 V, Tj = -40 °C to +150 °C, all voltages with respect to ground; direction of currents as shown in Figure 7
“Measuring Circuit” on Page 19 (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Unit
Conditions
IQ ≤ 200 μA; Tj ≤ 25 °C;
VEN = 5 V;
Iq = II + ICS2 - IQ
IQ ≤ 200 μA; Tj ≤ 85 °C;
VEN = 5 V;
Iq = II + ICS2 - IQ
IQ = 50 mA
VEN = 5 V;
Iq = II + ICS2 - IQ
IQ = 100 mA
VEN = 5 V;
Iq = II + ICS2 - IQ
IQ = 150 mA
VEN = 5 V;
Iq = II + ICS2 - IQ
Tj ≤ 25 °C
VEN = 0.8 V
Iq = II + ICS2 - IQ
Tj ≤ 85 °C;
VEN = 0.8 V
Iq = II + ICS2 - IQ
Min.
Typ.
Max.
–
150
200
μA
6.1.2
–
175
250
μA
6.1.3
–
1.2
2.6
mA
6.1.4
–
3.5
6
mA
6.1.5
–
5
10
mA
–
–
3
μA
–
–
5
μA
6.1.1
6.1.6
Current Consumption
Current Consumption
6.1.7
Data Sheet
Iq,on
Iq,off
12
Rev. 1.0, 2009-05-07
TLF4277
Current Consumption
6.2
Typical Performance Graphs Current Consumption
Current Consumption Iq,off vs.
Junction Temperature Tj
Current Consumption Iq,on vs.
Junction Temperature Tj
Iq,off-Tj.vsd
3,0
Iq [µA ]
2,0
250
1,5
150
1,0
100
0,5
50
-20
0
20
40
60
80
VBAT = 13 .5 V
VEN = 5 V
IQ = 200 µA
Iq [µA ]
VBAT = 13.5 V
VEN = 0 .8 V
- 40
Iq-Tj(IQ200µA ).vsd
300
100
- 40
T J [°C]
0
40
80
120
150
T J [°C]
Current Consumption Iq,on vs.
Output Current IQ
Iq-IQ.vsd
4,5
Iq [mA ]
T= 85°C
VBAT = 13.5 V
VEN = 5 V
3,0
2,5
T= 25°C
2,0
1,5
1,0
0,5
0
40
80
120
160
IQ [mA]
Data Sheet
13
Rev. 1.0, 2009-05-07
TLF4277
Current and Protection Monitor Functions
7
Current and Protection Monitor Functions
7.1
Functional Description Current and Protection Monitors
The TLF4277 provides a set of advanced monitor functionality. The current flowing into the power stage can be
monitored at the CSO output. In addition the current limitation can be adjusted via external resistors. Events of the
implemented protection functions are reported through dedicated voltage levels at the CSO output. This
information can be processed by an external µC for system analysis and failure identification. The monitored
events are over-current, overvoltage, and temperature shutdown.
RSHUNT
V BAT
R CS1
ICS 1
I CS2
C S1
C S2
to pow er stage
C urrent
M onitor
M onitor C ircuits
OC -D etection
OV- D etection
Buffer
T SD -D etection
Current _ Monitor .vsd
GN D
C SO
I CSO
C CSO
Figure 5
R CSO
Block diagram current and protection monitor
To reduce possible effects from the supply voltage VBAT additional filtering in of the supply voltage is
recommended. A combination of a 100 nF capacitor and an additional buffer capacitor of 10 µF or higher should
be placed as close a possible to the IC terminal, which are connected to VBAT.
Figure 6 shows the output level at the CSO pin versus the operation or fault condition. The graph is valid for the
following set up of external components:
RSHUNT = 1Ω
RCS1 = 100 Ω
CCSO = 2.2 µF
RCSO = 1.5 kΩ
Data Sheet
14
Rev. 1.0, 2009-05-07
TLF4277
Current and Protection Monitor Functions
VCSO
[V]
3,2
Short Circuit to V BAT
3.1 V typical
3,0
2,95
Thermal Shut Down
2.80 V typical
2,65
Current limitation and SC to GND
2.55 V typical
2,45
Linear Current Sense Band
up to 2.45 V
0
163 170
Figure 6
Output levels and functionality of the CSO output1)
7.1.1
Linear Current Monitor
ICS2
[mA]
Inside the linear current monitor area the current driven out of the CSO pin is proportional to the voltage which is
measured between pin CS1 and CS2.
The level of the current ICSO can be adjusted according to Equation (2):
R SHUNT
V CS1 – V CS2
I CSO = ------------------------------ = I CS2 × -------------------R CS1
R CS1
Adjustment ICSO
(2)
R CSO
( V CS1 – V CS2 ) × R CSO
V CSO = ------------------------------------------------------- = V SHUNT × ------------R CS1
R CS1
Adjustment of the voltage level for VCSO
(3)
1) The graph is just an example and only valid for an certain configuration of the external components
Data Sheet
15
Rev. 1.0, 2009-05-07
TLF4277
Current and Protection Monitor Functions
7.1.2
Adjustable Output Current Limitation
The TLF4277 has an adjustable current limitation for the current flowing into the power stage (pin CS2). If the level
of the voltage drop across the sense resistor RSHUNT is higher than the desired linear monitor range the output
current of the TLF4277 will be limited.
2.55V × R CS1
I CS2,lim = -------------------------------------R SHUNT × R CSO
Setting of the adjustable current limitation
(4)
A voltage level as defined in Table 7.2.6 on Page 17 will be applied at the CSO pin.
To achieve a current limitation of 170mA the following configuration can be used:
× 100Ω- = 170mA
I CS2,lim = 2.55V
---------------------------------1Ω × 1.5kΩ
RSHUNT = 1Ω
RCS1 = 100Ω
RCSO = 1.5kΩ
7.1.3
Overvoltage Detection
To detect a possible short circuit of the output to a higher supply rail the TLF4277 has an overvoltage detection
implemented. An overvoltage will be detected, if the voltage level at the ADJ pin is 20% higher than the internal
reference voltage VREF,int defined in Table 5.2.1 on Page 9.
Under this condition the CSO pin will be driven through an internal voltage buffer with a voltage level as defined
in Table 7.2.7 on Page 17.
7.1.4
Thermal Shutdown Detection
If the junction temperature will exceed the limits defined in the Table 5.2.14 on Page 9 the TLF4277 will disable
the output voltage. In this case a voltage level as defined in Table 7.2.8 on Page 17 will be applied at the CSO pin.
Data Sheet
16
Rev. 1.0, 2009-05-07
TLF4277
Current and Protection Monitor Functions
7.2
Electrical Characteristics Current and Protection Monitor
Electrical Characteristics: Current Monitor Function
VBAT = 13.5 V, Tj = -40 °C to +150 °C, all voltages with respect to ground, direction of currents as shown in Figure 7
“Measuring Circuit” on Page 19 (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Min.
Typ.
Max.
Unit Conditions
Linear Current Monitor
7.2.1
Current Sense Output Current ICSO ICSO
(VSHUNT = 10 mV)
0.08
0.1
0.12
mA
7.2.2
(VSHUNT = 50 mV)
(VSHUNT = 100 mV)
(VSHUNT = 150 mV)
0.47
0.5
0.53
mA
0.97
1
1.03
mA
1.45
1.5
1.55
mA
ICS2,lim
162
VCSO,cur_lim 2.45
170
187
mA
2.55
2.65
V
RSHUNT = 1Ω
RCS1 = 100 Ω
RCSO = 1.5 kΩ
VQ < 0,95 * VQ,nom1)
VCSO,OV
3.0
3.1
3.2
V
VADJ > 1.2 * VREF,nom1)
VCSO,TSD
2.65
2.8
2.95
V
150 °C < Tj < 180 °C
7.2.3
7.2.4
Tj =25°C
RSHUNT = 1Ω
RCS1 = 100 Ω
RCSO = 1.5 kΩ1)
Adjustable Current Limitation
7.2.5
Adjustable Current Limit
7.2.6
CSO Voltage Level
Current limitation
Output Level Overvoltage Detected
7.2.7
CSO Voltage Level
Overvoltage detected
Output Level Overtemperature Detected
7.2.8
CSO Voltage Level
Overtemperature Detected 2)
1) Referring to the device tolerance only, the tolerance of the external components can cause additional deviation
2) Specified by design; not subject to production test
Data Sheet
17
Rev. 1.0, 2009-05-07
TLF4277
Enable Function
8
Enable Function
8.1
Description Enable Function
The TLF4277 can be turned on or turned off via the EN Input. With voltage levels higher than VEN,high applied to
the EN Input the device will be completely turned on. A voltage level lower than VEN,low sets the device to low
quiescent current mode. In this condition the device is turned off and is not functional. The Enable Input has an
build in hysteresis to avoid toggling between ON/OFF state, if signals with slow slope are applied to the input.
8.2
Electrical Characteristics Enable Function
Electrical Characteristics: Enable Function
VBAT = 13.5 V, Tj = -40 °C to +150 °C, all voltages with respect to ground, direction of currents as shown in Figure 7
“Measuring Circuit” on Page 19 (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Min.
Typ.
Max.
Unit
Conditions
8.2.1
Enable
Low Signal Valid
VEN,low
–
–
0.8
V
–
8.2.2
Enable
High Signal Valid
VEN,high
2
–
–
V
VQ settled
8.2.3
Enable
Threshold Hysteresis
VEN,hyst
50
–
–
mV
–
8.2.4
Enable
Input current
IEN
–
–
2
µA
VEN = 5 V
8.2.5
Enable
internal pull-down resistor
REN
3
4.5
6
MΩ
–
Data Sheet
18
Rev. 1.0, 2009-05-07
TLF4277
Application Information
9
Application Information
9.1
Measurement Circuit
I BAT
RSHUNT
R CS1
II
VBAT
I
I CS1
I CS2
CS1
CS2
TLF4277
Q
IQ
Internal
Supply
CI
I EN
VSHUNT
R1
ADJ
Current
Monitor
EN
CQ
Monitor
Circuits
VEN
Measuring _Circuit. vsd
I ADJ
R2
VQ
RL
VAdj
GND
CSO
I CSO
CSO
Figure 7
R SO
V CSO
Measuring Circuit
Measurement Set Up:
RSHUNT = 1Ω
RCS1 = 100 Ω
CCSO = 2.2 µF
RCSO = 1.5 kΩ
R1 = 38 kΩ
R2 = 12 kΩ
CQ = 10 µF
Data Sheet
19
Rev. 1.0, 2009-05-07
TLF4277
Package Outlines
10
Package Outlines
0.15 M C A-B D 14x
0.64 ±0.25
1
8
1
7
0.2
M
D 8x
Bottom View
3 ±0.2
A
14
6 ±0.2
D
Exposed
Diepad
B
0.1 C A-B 2x
14
7
8
2.65 ±0.2
0.25 ±0.05 2)
0.08 C
8˚ MAX.
C
0.65
0.1 C D
0.19 +0.06
1.7 MAX.
Stand Off
(1.45)
0 ... 0.1
0.35 x 45˚
3.9 ±0.11)
4.9 ±0.11)
Index Marking
1) Does not include plastic or metal protrusion of 0.15 max. per side
2) Does not include dambar protrusion
PG-SSOP-14-1,-2,-3-PO V02
Figure 8
PG-SSOP14 EP
Green Product (RoHS compliant)
To meet the world-wide customer requirements for environmentally friendly products and to be compliant with
government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e
Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020).
For further information on Infineon packages, please visit our website:
http://www.infineon.com/packages.
Data Sheet
20
Dimensions in mm
Rev. 1.0, 2009-05-07
TLF4277
Revision History
11
Revision History
Revision
Date
Changes
1.0
2009-05-07
Data Sheet
Data Sheet
21
Rev. 1.0, 2009-05-07
Edition 2009-05-07
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2009 Infineon Technologies AG
All Rights Reserved.
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of any third party.
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