1.8A DC/DC Step-Down Voltage Regulator
TLE8366
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Overview
1.8A step down voltage regulator
Output voltage versions: 5.0 V, 3.3 V and adjustable
± 2% output voltage tolerance (+-4% for full load current range)
Integrated power transistor
PWM regulation with feedforward
Input voltage range from 4.75V to 45V
370 kHz switching frequency
Synchronization input
Very low shutdown current consumption (<2uA)
Soft-start function
Input undervoltage lockout
Suited for automotive applications:
T
j
= -40
°C
to +150
°C
Green Product (RoHS compliant)
AEC Qualified
PG-DSO-8
Description
The TLE8366 is a PWM step-down DC/DC converter with an integrated 1.8 A power switch, packaged in a small
PG-DSO-8 with exposed pad. There are three versions available, two fixed voltage with 5.0 V (TLE8366EV50) or
3.3 V (TLE8366EV33) and a variable voltage variant named TLE8366EV with a reference feedback voltage of only
600 mV. The wide input voltage range from 4.75 to 45 V makes the TLE8366 suitable for a wide variety of
applications. The device is designed to be used under harsh automotive environment.
The switching frequency of nominal 370 kHz allows the use of small and cost-effective inductors and capacitors,
resulting in a low, predictable output ripple and in minimized consumption of board space. (If desired the device
could be synchronized to an external frequency source between 200 and 530 kHz.)
The TLE8366 includes safety features such as a cycle-by-cycle current limitation, over-temperature shutdown and
input under voltage lockout. The enable function, in shutdown mode with less than 2 µA current consumption,
enables easy power management in battery-powered systems.
The voltage regulation loop provides an excellent line and load regulation. The stability of the loop could be
adjusted by using an external compensation network. This compensation network combined with voltage mode
regulation and a feed-forward control path guarantees a highly effective line transient rejection. During start-up the
integrated soft-start limits the inrush current peak and prevents from a voltage overshoot.
Type
TLE8366EV50
TLE8366EV33
TLE8366EV
Data sheet
Package
PG-DSO-8
PG-DSO-8
PG-DSO-8
2
Marking
8366EV50
8366EV33
8366EV
Rev. 1.0, 2009-05-18
TLE8366
Pin Configuration
3
3.1
Pin Configuration
Pin Assignment
SYNC
GND
COMP
FB
1
2
3
4
TLE8366
8
7
6
5
S08_PIN.vsd
VS
EN
BUO
BDS
Figure 2
Pin Configuration
3.2
Pin
1
Pin Definitions and Functions
Symbol Function
SYNC
Synchronization Input.
Connect to an external clock signal in order to synchronize/adjust the switching frequency.
If not used connect to GND.
Ground.
Compensation Input.
Frequency compensation for regulation loop stability.
Connect to compensation RC-network.
Feedback Input.
For the adjustable output voltage versions (TLE8366EV) connect via voltage divider to output
capacitor.
For the fixed voltage version (TLE8366EV50, TLE8366EV33) connect this pin directly to the
output capacitor.
Buck Driver Supply Input.
Connect the bootstrap capacitor between this pin and pin BUO.
Buck Switch Output.
Source of the integrated power-DMOS transistor. Connect directly to the cathode of the catch
diode and the buck circuit inductance.
Enable Input.
Active-high enable input with integrated pull down resistor.
Supply Voltage Input.
Connect to supply voltage source.
Connect to heatsink area and GND by low inductance wiring.
2
3
GND
COMP
4
FB
5
6
BDS
BUO
7
8
EN
VS
Exposed Pad
Data sheet
4
Rev. 1.0, 2009-05-18
TLE8366
General Product Characteristics
4
4.1
General Product Characteristics
Absolute Maximum Ratings
Absolute Maximum Ratings
1)
T
j
= -40
°C
to +150
°C;
all voltages with respect to ground (unless otherwise specified)
Pos.
Voltages
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
4.1.9
4.1.10
4.1.11
4.1.12
4.1.13
4.1.14
1)
2)
3)
4)
Parameter
Symbol
Limit Values
Min.
Max.
5.5
6.2
5.5
6.2
10
5.5
Unit
Conditions
Synchronization Input
Compensation Input
Feedback Input
V
SYNC
V
COMP
V
FB
-0.3
-0.3
-0.3
-0.3
V
V
V
V
V
V
V
V
V
V
°C
°C
kV
V
V
–
t
< 10s
2)
–
t
< 10s
2)
TLE8366EV50;
TLE8366EV33
TLE8366EV
Buck Driver Supply Input
Buck Switch Output
Enable Input
Supply Voltage Input
Junction Temperature
Storage Temperature
ESD Resistivity
ESD Resistivity to GND
ESD Resistivity corner pins to GND
V
BDS
V
BUO
V
EN
V
VS
T
j
T
stg
V
ESD
V
ESD
V
ESD
V
BUO
- 0.3
-2.0
-40
-0.3
-40
-55
-2
-500
-750
V
BUO
+ 5.5
V
VS
+ 0.3
45
45
150
150
2
500
750
Temperatures
–
–
HBM
3)
CDM
4)
CDM
4)
ESD Susceptibility
Not subject to production test, specified by design
Exposure to those absolute maximum ratings for extended periods of time (
t
> 10s) may affect device reliability
ESD susceptibility HBM according to EIA/JESD 22-A 114B (1.5kΩ,100pF).
ESD susceptibility, Charged Device Model “CDM” EIA/JESD22-C101 or ESDA STM5.3.1
Note: Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
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.
Data sheet
5
Rev. 1.0, 2009-05-18
Embedded System
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