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Step Down Voltage-Regulator with Reset
Datasheet 1 Overview
TLE 6365
1.1 Features * * * * * * * * * * Step down converter Supply Over- and Under-Voltage-Lockout Low Output voltage tolerance Output Overvoltage Lockout Output Under-Voltage-Reset with delay Overtemperature Shutdown Wide Ambient operation range -40C to 125C Wide Supply voltage operation range Very low current consumption Very small P-DSO-8 SMD package Ordering Code Q67006-A9515
P-DSO-8-3
Type TLE 6365 G Functional description General
Package P-DSO-8-3
The TLE 6365 G is a power supply circuit especially designed for automotive applications. The device is based on Infineon's power technology SPT(R) which allows bipolar and CMOS control circuitry to be integrated with DMOS power devices on the same monolithic circuitry. The TLE 6365 G contains a buck converter and a power on reset feature to start up the system. The very small P-DSO-8-3 SMD package meets the application requierements. It delivers a precise 5V fully short circuit protected output voltage. Furthermore, the build-in features like under- and overvoltage lockout for supply- and output-voltage and the overtemperature shutdown feature increase the reliability of the TLE 6365 G supply system.
Data Sheet Rev. 1.7
1
2003-06-02
TLE 6365
1.2 Pin No 1
Pin Definitions and Functions Symbol Function R Reference Input; an external resistor from this pin to GND determines the reference current and so the oscillator / switching frequency Reset Output; open drain output from reset comparator with an internal pull up resistor Buck-Converter Compensation Input; output of internal error amplifier; for loop-compensation and therefore stability connect an external R-C-series combination to GND. Ground; analog signal ground Output Voltage Input; feedback input (with integrated resistor devider) and logic supply input; external blocking capacitor necessary Buck Converter Output; source of the integrated power-DMOS Buck Driver Supply Input; voltage to drive the buck converter powerstage Supply Voltage Input; buck converter input voltage; external blocking capacitor necessary.
2 3
RO BUC
4 5
GND VCC
7 6 8
BUO BDS VS
Pin Configuration
R RO BUC GND
1 2 3 4
8 7 6 5
VS BUO BDS VCC
P-DSO-8-3
Figure 1
Pin Configuration (top view)
Data Sheet Rev. 1.7
2
2003-06-02
TLE 6365
1.3
Block Diagram
VS
8
Biasing and VREF
BUC
6
BDS
3
Buck Converter
7
BUO
TLE 6365 G
R
1 Reference Current Generator and Oscillator
Vinternal
5
VCC
Undervoltage Reset Generator
2
RO
4
GND
Figure 2
Block Diagram
Data Sheet Rev. 1.7
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2003-06-02
TLE 6365
1.4 Parameter
Absolute Maximum Ratings Symbol Limit Values min. max. Unit Remarks
Voltages Supply voltage Buck output voltage Buck driver supply voltage Buck compensation input voltage Logic supply voltage Reset output voltage Current reference voltage VS VBUO VBDS VBUC VCC VRO VR - 0.3 -1 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 46 46 55 6.8 6.8 6.8 6.8 V V V V V V V
ESD-Protection (Human Body Model; R=1,5k; C=100pF) all pins to GND Temperatures Junction temperature Storage temperature
VHBM
-2
2
kV
Tj Tstg
- 40 - 50
150 150
C C
- -
Note: Stresses above those listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Data Sheet Rev. 1.7
4
2003-06-02
TLE 6365
1.5
Operating Range
Parameter Supply voltage Supply voltage Supply voltage Supply voltage Buck output voltage Buck driver supply voltage Buck compensation input voltage Logic supply voltage Reset output voltage Current reference voltage Junction temperature Thermal Resistance Junction ambient
Symbol VS VS VS VS VBUO VBDS VBUC VCC VRO VCREF
Limit Values min. - 0.3 5 4.5 - 0.3 - 0.6 - 0.3 0 4.0 - 0.3 0 - 40 max. 40 35 36 4.5 40 50 3.0 6.2 VCC +0.3 1.23 150
Unit V V V V V V V V V V C
Remarks
VS increasing VS decreasing Buck-Converter OFF
Tj
Rthj-a
180
K/W
-
Data Sheet Rev. 1.7
5
2003-06-02
TLE 6365
1.6
Electrical Characteristics
8V< VS < 35V; 4.75V< VCC <5.25V; - 40C< Tj <150C; RR=47k;
all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified
No.
Parameter
Symbol
Limit Values min. typ.
Unit Test Condition max .
1.6.1 Current Consumption 1.6.1.1 Current consumption; see applicatiopn circuit 1.6.1.2 Current consumption; see applicatiopn circuit IS IS 1.5 5 4 10 mA mA ICC=0mA ICC=400mA
1.6.2 Under- and Over-Voltage Lockout at VS 1.6.2.1 UV ON voltage; buck conv. ON 1.6.2.2 UV OFF voltage; buck conv. OFF 1.6.2.3 UV Hysteresis voltage 1.6.2.4 OV OFF voltage; buck conv. OFF 1.6.2.5 OV ON voltage; buck conv. ON 1.6.2.6 OV Hysteresis voltage VSUVON VSUVOFF VSUVHY VSOVOFF VSOVON VSUVHY 4.0 3.5 0.2 34 30 1.5 4.5 4.0 0.5 37 33 4 5.0 4.5 1.0 40 36 10 V V V V V V VS increasing; VS decreasing HY = ON OFF VS increasing VS decreasing HY = OFF ON
1.6.3 Over-Voltage Lockout at VCC 1.6.3.1 OV OFF voltage; buck conv. OFF 1.6.3.2 OV ON voltage; buck conv. ON 1.6.3.3 OV Hysteresis voltage VCCOVOFF 5.5 6.0 6.5 V VCC increasing VCC decreasing HY = OFF ON
VCCOVON 5.25 5.75 VCCOVHY 0.10 0.25
6.25 V 0.50 V
Data Sheet Rev. 1.7
6
2003-06-02
TLE 6365
1.6
Electrical Characteristics (cont'd)
8V< VS < 35V; 4.75V< VCC <5.25V; - 40C< Tj <150C; RR=47k;
all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified
No.
Parameter
Symbol
Limit Values min. typ.
Unit Test Condition max .
1.6.4 Buck-Converter; BUO, BDS, BUC and VCC 1.6.4.1 Logic supply voltage VCC 4.9 5.1 V
1mA < ICC< 400mA; see. appl. circuit
1.6.4.2 Efficiency; see. appl. circuit
85
%
ICC = 400mA; VS = 14V Tj=25C; IBUO= 0.6A IBUO= 0.6A
1.6.4.3 Power-Stage ON resistance 1.6.4.4 Power-Stage ON resistance 1.6.4.6 Input current on pin VCC 1.6.4.7 Buck Gate supply voltage; VBGS=VS - VBDS 1.6.5
RBUON RBUON 0.7 5
0.38
0.5 1.0
A A V
1.6.4.5 Buck overcurrent threshold IBUOC ICC VBGS
0.9 7.2
1.2 500 10
VCC=5V
Reference Input ; R (Oscillator; Timebase for Buck-Converter and Reset)
1.6.5.1 Voltage on pin R 1.6.5.2 Oscillator frequency 1.6.5.3 Oscillator frequency 1.6.5.4 Cycle time for reset timing
VR fOSC fOSC tCYL
1.4 85 75 1 95 105 115
RR = 100k kHz Tj = 25C
V kHz ms
tCYL = 100 / fOSC
Data Sheet Rev. 1.7
7
2003-06-02
TLE 6365
1.6
Electrical Characteristics (cont'd)
8V< VS < 35V; 4.75V< VCC <5.25V; - 40C< Tj <150C; RR=47k;
all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified
No.
Parameter
Symbol
Limit Values min. typ.
Unit Test Condition max .
1.6.6 Reset Generator; RO 1.6.6.1 Reset threshold; VCC decreasing
VRT
4.50 4.65
4.75 V
VRO H to L or L to H transition; VRO remains low down to VCC>1V IROL=1mA; 2.5V < VCC < VRT IROL=0.2mA ; 1V < VCC < VRT IROH = 0mA 0V < VRO< 4V VCC < VRT
1.6.6.2 Reset low voltage
VROL
-
0.2
0.4
V
1.6.6.3 Reset low voltage
VROL
-
0.2
0.4
V
1.6.6.4 Reset high voltage 1.6.6.5 Reset pull up curent 1.6.6.6 Reset Reaction time
VROH IRO
VCC -0.1 240 10 40 128
VCC V +0.1 90 s
tRR 1.6.6.7 Power-up reset delay time tRD
tCYL VCC 4.8 V
1.6.7 Thermal Shutdown (Boost and Buck-Converter OFF) 1.6.7.1 Thermal shutdown junction TjSD temperature 1.6.7.2 Thermal switch-on junction TjSO temperature 1.6.7.3 Temperature hysteresis T 150 120 30 175 200 170 C C K
Data Sheet Rev. 1.7
8
2003-06-02
TLE 6365
2
Circuit Description
Below some important sections of the TLE 6365 are described in more detail. Power On Reset In order to avoid any system failure, a sequence of several conditions has to be passed. In case of VCC power down (VCC < VRT for t > tRR) a logic LOW signal is generated at the pin RO to reset an external microcontroller. When the level of VCC reaches the reset threshold VRT, the signal at RO remains LOW for the Power-up reset delay time tRD before switching to HIGH. If VCC drops below the reset threshold VRT for a time extending the reset reaction time tRR, the reset circuit is activated and a power down sequence of period tRD is initiated. The reset reaction time tRR avoids wrong triggering caused by short "glitches" on the VCC-line.
VCC
VPG VRT typ.4,70V typ.4,65V
< tRR
< tRD
1V
Start Up
ON Delay ON Delay started stopped
ON Delay
t
RO
Power
H L
invalid
tRD tRR
invalid Normal Failed N
invalid
tRD
t
Sart-Up
Failed
Normal
Figure 3
Reset Function
Data Sheet Rev. 1.7
9
2003-06-02
TLE 6365
Buck Converter A stabilized logic supply voltage (typ. 5 V) for general purpose is realized in the system by a buck converter. An external buck-inductance LBU is PWM switched by a high side DMOS power transistor with the programmed frequency (pin R). The buck converter uses the temperature compensated bandgap reference voltage (typ. 2.8 V) for its regulation loop. This reference voltage is connected to the non-inverting input of the error amplifier and an internal voltage divider supplies the inverting input. Therefore the output voltage VCC is fixed due to the internal resistor ratio to typ. 5.0 V. The output of the error amplifier goes to the inverting input of the PWM comparator as well as to the buck compensation output BUC. When the error amplifier output voltage exceeds the sawtooth voltage the output power MOS-transistor is switched on. So the duration of the output transistor conduction phase depends on the VCC level. A logic signal PWM with variable pulse width is generated.
VCC RVCC3 39R7 RVCC4 10R3 BUC Pin 3 RProt1 200 GND
+ -
VthOV 1,2V GND
H when UV at VBOOST
+
L when Overcurrent VthUV 4V GND
OC COMP
L when Overcurrent NOR1
Gate Driver Supply
PWM-FF
VCC Pin 5
VCC RVCC1 22R RVCC2 28R GND
VREF 2,8V GND
+
Error AMP
Error-Signal
-
Error-Ramp
PWM COMP
H when Error-Signal < Error-Ramp
NOR 1 Output Stage OFF when H ERROR-FF
>1
R
+
& &
Q
H= OFF
INV
H= ON
1
Gate Driver
R
L when Tj >175C
& &
Q
OFF when H NAND 2
&
Oscillator Schmitt-trigger 1 Ramp
S
Q
S
Clock
Q
R Pin 1
Vmax Vmin tr tf tr t
Vhigh Vlow tr tf tr
t
Figure 4
Buck Converter Block Diagram
External loop compensation is required for converter stability, and is formed by connecting a compensation resistor-capacitor series-network (RBUC, CBUC) between pin BUC and GND.
Data Sheet Rev. 1.7
10
+
VthOC 18mV RSense 18m
OV COMP
H when OV at VCC
UV COMP
VS Pin 8
BDS Pin 6
Power D-MOS
BUO Pin 7
2003-06-02
TLE 6365
In the case of overload or short-circuit at VCC (the output current exceeds the buck overcurrent threshold IBUOC) the DMOS output transistor is switched off by the overcurrent comparator immediately. In order to protect the VCC input as well as the external load against catastrophic failures, an overvoltage protection is provided which switches off the output transistor as soon as the voltage at pin VCC exceeds the internal fixed overvoltage threshold VCCOVOFF = typ. 6.0 V. Also a battery undervoltage protection is implemented in the TLE 6365 to avoid wrong operation of the following supplied devices, the typical threshold when decreasing the battery voltage is at VSUVOFF = typ. 4.0 V.
Data Sheet Rev. 1.7
11
2003-06-02
TLE 6365
VO
and
Error Voltage
VError Vmax Vmin
OCLK H L PWM H L
t t t
I BUO I BUOC
I DBU
t
VBUO VS
t
VCC
t
Overcurrent Threshold Exceeded Load-Current Increasing with Time; Controlled by the Error Amp Controlled by the Overcurrent Comp
AED02673
Figure 5
Most Important Waveforms of the Buck Converter Circuit
Data Sheet Rev. 1.7
12
2003-06-02
TLE 6365
3 t
Application circui
D1
VBatt
CL 10uF
ZD1 36V
8
CS 220nF VS
Biasing and VREF
BUC
6
BDS
RCO 47k CCO 470nF
3
Buck Converter
CBOT
BUO
10nF LBU 220uH CBU1 100uF CBU2 220nF
7
TLE 6365 G
R
1 Reference Current Generator and Oscillator
Vinternal
5
VCC
DBU
VCC
RR 100k
Undervoltage Reset Generator
2
RO
Reset output
4
GND
Device
D1 DBU LBU LBU
Type
BAW78C SS14 B82476-A1224-M DO3316P-224
Supplier
Infineon Epcos Coilcraft
Remarks
200V; 1A; SOT89 Schottky; 100V; 1A 220H; 0.8A; 0.53 220H; 0.8A; 0.61
Figure 6
Application Circuit
Data Sheet Rev. 1.7
13
2003-06-02
TLE 6365
4
Diagrams: Oscillator and Boost/Buck-Converter Performance Oscillator Frequency Deviation vs. Junction Temperature
AED03017
In the following the behaviour of the Boost/Buck-converter and the oscillator is shown. Efficiency Buck vs. Boost Voltage
95
%
90
f OSC VCC = 5 V
10 kHz 5 Referred to f OSC at Tj = 25 C
AED03016
85 0 80
I Load = 120 mA
80 mA -5
75
70
-10 40 mA -15 -50 -25 0
65
5
15
25
V 30
25 50 75 100 C 150
VS
Tj
Feedback Voltage vs. Junction Temperature
5.15 VCC V 5.10
Buck Overcurrent Threshold vs. Junction Temperature
I OC
1.4 A 1.3
AED03018
5.05 IBUO = 400 mA 5.00
1.2
1.1
4.95
4.90
1
I BUOC (Buck-Converter)
4.85
0.9 0.8 -50 -25 0
4.80 -50
-25
0
25
50
75
100 Tj
C
150
25 50 75 100
C 150
Tj
14 2003-06-02
Data Sheet Rev. 1.7
TLE 6365
Current Consumption vs. Junction Temperature
I Boost
3 mA 2.5 Boost ON Buck ON I BO boost = 0 mA I CC = 0 mA
AED02940
Oscillator Frequency vs. Resistor between R and GNDr
fOSC
1000 kHz 500
AED02982
200 @ Tj = 25 C 100
2
1.5
50
1
20
0.5 -50 -25 0
25 50 75 100 C 150
10
5
10
20
50 100 200
Tj
k 1000 RR
Efficiency Buck vs. Load
90 % 85 RT, HT
AED02942
Buck ON Resistance vs. Junction Temperature
1000 RON m 800 700
80
CT
600 500
75
400 300 RBUON @ IBUO = 600 mA
70
200 100
65
0
50
150
mA
250
-50
-25
0
25
50
75
100 Tj
C
150
I LOAD
Data Sheet Rev. 1.7
15
2003-06-02
TLE 6365
5
Package Outlines
Edition 6.99
Data Sheet Rev. 1.7
16
2003-06-02
TLE 6365
Published by Infineon Technologies AG i. Gr., Bereichs Kommunikation, St.-Martin-Strasse 53 D-81541 Munchen
(c) Infineon Technologies AG1999
All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as warranted characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Infineon Technologiesis an approved CECC manufacturer. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address list). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
Data Sheet Rev. 1.7
17
2003-06-02

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