TS33000
High Efficiency Synchronous
DC/DC Buck Converter
TRIUNE PRODUCTS
Features
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Fixed Output option has automatic low power PFM mode
for reduced quiescent current at light loads
2.25MHz +/- 10% fixed switching frequency
Fixed output voltages: 0.8V, 0.9V, 1.2V, 1.5V, 1.8V,
2.5V, and 3.3V with +/- 2% output tolerance
Input voltage range: 2.0V to 5.5V
Voltage mode PWM control with input voltage feed-
forward compensation
Voltage supervisor for VOUT reported at the PG pin
Input supply under voltage lockout
Soft start for controlled startup with no overshoot
Full protection for over-current, over-temperature,
and VOUT overvoltage
Less than 100nA in shutdown mode
Multiple enable pins for flexible system sequencing
Low external component count
Junction operating temperature -40C to 125C
Packaged in a 16 pin QFN (3x3)
Description
The TS33000 is a DC/DC synchronous switching regulator
with fully integrated power switches, internal compensation,
and full fault protection. The switching frequency of 2.25MHz
enables the use of extremely small filter components, resulting
in smaller board space and reduced BOM costs.
When the input current is greater than approximately 50mA,
the TS33000 utilizes PWM voltage mode feedback with input
voltage feed-forward to provide a wide input voltage range
without the need for external compensation.
For the Fixed Output option, when the input current is less
than 50mA, the device uses a PFM mode to provide increased
efficiency at light loads. The cross over between PFM mode
and PWM is automatic and has hysteresis to prevent oscillation
between the modes. Additionally, the nLP mode pin can be
used to force the device into PWM mode to reduce the output
ripple, if needed (Fixed Output only).
The TS33000 integrates a wide range of protection circuitry;
including input supply under-voltage lockout, output under-
voltage, output over-voltage, soft start, high side FET and low
side FET current limits, and thermal shutdown.
Applications
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Point of load
Systems with deep submicron ASICs/FPGAs
Set-top box
Communications equipment
Portable and handheld equipment
Typical Applications
Fixed Output
VCC
2x4.7uF
VCC
VSW
VOUT
Sense
1.5uH
VOUT
4.7uF
TS33000
FB
VCC or VOUT
10 kohm
(optional)
nLP
EN
nLP
EN
TS33000
Final Datasheet
May 1, 2015
Rev 1.9
www.semtech.com
PGND
PG
PG
GND
1 of 17
Semtech
Pinout
PGND
PGND
VSW
VCC
VCC
GND
VOUT
Sense
TS33000
VSW
VSW
nLP
VSW
VCC
TEST
OUT
EN
PG
FB
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
VSW
VCC
VCC
GND
FB
V
OUT
Sense
nLP
PG
EN
TEST OUT
VCC
VSW
PGND
VSW
VSW
PGND
Pin Function
Switching Voltage Node
Input Voltage
Input Voltage
GND
Feedback Input
Output Voltage Sense
nLP Input
PG Output
Enable Input
Test Mode Output
Input Voltage
Switching Voltage Node
Power GND
Switching Voltage Node
Switching Voltage Node
Power GND
Description
Connect to 1.5uH inductor. Short to Pins 12, 14, & 15
Input voltage supply. Short to Pins 3 & 11
Input voltage supply. Short to Pins 2 & 11
Ground for the internal circuitry of the device
Feedback voltage for the regulator when used in adjustable mode.
Connect to the output voltage resistor divider for adjustable mode
and No Connection for fixed output modes
Output Voltage Sense. Requires kelvin connection to 4.7uF
output capacitor
Forcing this pin high prevents the device from going into Low Power
PFM mode operation
Power Good indicator Open-drain output.
Input high voltage enables the device. Input low disables the device.
Connect to GND. For internal testing use only.
Input voltage supply. Short to Pins 2 & 3
Connect to 1.5uH inductor. Short to Pins 1, 14, & 15
GND supply for internal low-side FET/integrated diode. Short to Pin 16
Connect to 1.5uH inductor. Short to Pins 1, 12, & 15
Connect to 1.5uH inductor. Short to Pins 1, 12, & 14
GND supply for internal low-side FET/integrated diode.
Short to Pin 13
TS33000
Final Datasheet
May 1, 2015
Rev 1.9
www.semtech.com
2 of 17
Semtech
Functional Block Diagram
nLP
PG
EN
VCC
MONITOR
&
CONTROL
Under Voltage
Protection
Thermal
Protection
Over Current
Protection
VCC
Oscillator
Ramp
Generator
Vref
&
Softstart
Gate Drive
Control
Error Amp
Comparator
Gate
Drive
VSW
1.5uH
VOUT
4.7uF
Gate
Drive
Compensation
Network
PGND
R
TOP
(Adjustable)
R
BOT
GND
(Adjustable)
FB
Vout
Sense
(Adjustable)
(Adjustable)
Figure 1: TS33000 Block Diagram for fixed and adjustable mode devices
TS33000
Final Datasheet
May 1, 2015
Rev 1.9
www.semtech.com
3 of 17
Semtech
Absolute Maximum Ratings
Over operating free–air temperature range unless otherwise noted
(1, 2)
Parameter
VCC
VSW
EN, PG,FB, nLP, TEST OUT, V
OUT
Sense
Electrostatic Discharge – Human Body Model
Electrostatic Discharge – Charge Device Model
Lead Temperature (soldering, 10 seconds)
Value
-0.3 to 6.0
-1 to 6.0
-0.3 to 6
±2k
±500
260
Unit
V
V
V
V
V
°C
Notes:
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating con-
ditions” is not implied. Exposure to absolute–maximum–rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground terminal.
Thermal Characteristics
Symbol
θ
JA
Parameter
Thermal Resistance Junction to Air (Note 1)
Value
50
Unit
°C/W
Note 1: Assumes QFN16 1 in
2
area of 2 oz copper and 25°C ambient temperature.
Recommended Operating Conditions
Symbol
VCC
T
STG
T
J MAX
T
J
L
OUT
C
OUT
C
OUT-ESR
C
BYPASS
Parameter
Input Operating Voltage
Storage Temperature Range
Maximum Junction Temperature
Operating Junction Temperature Range
Output Filter Inductor Typical Value (Note 1,3)
Output Filter Capacitor Typical Value (Note 2,3)
Output Filter Capacitor ESR
Input Supply Bypass Capacitor Typical Value (Note 2)
-40
1.2
3.76
0
1.5
4.7
5
2x4.7
Min
2.0
-65
Typ
3.3
Max
5.5
150
150
125
1.8
5.64
20
Unit
V
°C
°C
°C
uH
uF
mΩ
uF
Note 1: For best performance, an inductor with a saturation current rating higher than the maximum V
OUT
load requirement plus the inductor
current ripple. See the inductor current ripple calculations in inductor calculations sections.
Note 2: For best performance, a low ESR ceramic capacitor should be used – X7R or X5R types should be used. Y5V should be avoided.
Note 3: Min and max listed are to account for +/-20% variation of the typical value. Typical values of 4.7uF and 1.5uH are recommended.
TS33000
Final Datasheet
May 1, 2015
Rev 1.9
www.semtech.com
4 of 17
Semtech
Characteristics
Electrical characteristics, T
J
= -40C to 125C, VCC = 12V (unless otherwise noted)
Symbol
VCC Supply Voltage
VCC
I
CC-NORM
I
CC-LPM
I
CC-SHUTDOWN
Input Supply Voltage
Quiescent current
Normal Mode
Quiescent current Low Power
PFM Mode
Quiescent current
Shutdown Mod
Input Supply Under Voltage
Threshold
Input Supply Under Voltage
Threshold Hysteresis
Oscillator Frequency
VCC = 3.3V, I
LOAD
= 0A, V
EN
=3.3V,
nLP=3.3V
VCC = 3.3V, I
LOAD
= 0A, V
EN
=3.3V,
nLP=0V
VCC = 3.3V, EN=0V
2.0
12
45
0.1
5.5
V
mA
mA
uA
Parameter
Condition
Min
Typ
Max
Unit
VCC Under Voltage Lockout
VCC
-UV
VCC
-UV_HYST
OSC
f
OSC
PG Open Drain Output
t
PG
I
OH-PG
V
OL-PG
PG Release Timer
High-Level Output Leakage
Low-Level Output Voltage
V
PG
=5V VCC=5V
I
PG
= -0.3mA
10
0.1
0.01
ms
uA
V
2.0
2.25
2.5
MHz
VCC Increasing
1.9
100
2.0
V
mV
EN/nLP Input Voltage Thresholds
V
IH-EN/nLP
V
IL-EN/nLP
V
HYST-EN/nLP
I
IN-EN
nLP
PD
Thermal Shutdown
TSD
TSD
HYST
Thermal Shutdown Junction
Temperature
TSD Hysteresis
150
170
10
190
C
C
High Level Input Voltage
Low Level Input Voltage
Input Hysteresis
EN Input Leakage
nLP Pulldown Resistor
VCC=2V to 5V
VCC=2V to 5V
VCC=2V to 5V
V
EN
=5V VCC=5V
V
EN
=0V VCC=5V
Pulldown to GND
100
0.1
0.1
100
1.0
0.4
V
V
mV
uA
uA
KΩ
TS33000
Final Datasheet
May 1, 2015
Rev 1.9
www.semtech.com
5 of 17
Semtech
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