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TS30111-M000 Datenblatt(PDF) 7 Page - Semtech Corporation

Teilenummer TS30111-M000
Bauteilbeschribung  High Efficiency 700mA Current-Mode Synchronous Buck DC/DC Regulator, 1MHz
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Hersteller  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

TS30111-M000 Datenblatt(HTML) 7 Page - Semtech Corporation

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TS30111
Final Datasheet
Rev 1.0
June 2, 2015
www.semtech.com
7 of 21
Semtech
Functional Description
The TS30111 current-mode synchronous step-down power
supply product is ideal for use in the commercial, industrial,
and automotive market segments. It includes flexibility to be
used for a wide range of output voltages and is optimized for
high efficiency power conversion with low RDSON integrated
synchronous switches. A 1MHz internal switching frequency
facilitates low cost LC filter combinations. Additionally, the
fixed output versions enable a minimum external component
count to provide a complete regulation solution with only 4
external components: an input bypass capacitor, an inductor,
an output capacitor, and the bootstrap capacitor. The regulator
automatically transitions between PFM and PWM mode to
maximize efficiency for the load demand.
The TS30111 was designed to provide these system benefits:
Reduced board real estate
Lower system cost
Œ
Lower cost inductor
Œ
Low external parts count
Ease of design
Œ
Bill of Materials and suggested board layout provided
Œ
Power Good output
Œ
Integrated compensation network
Œ
Wide input voltage range
Robust solution
Œ
Over current, over voltage and over temperature pro-
tection
Detailed Pin Description
Unregulated input, VCC
This terminal is the unregulated input voltage source for the
IC. It is recommended that a 10uF bypass capacitor be placed
close to the device for best performance. Since this is the main
supply for the IC, good layout practices need to be followed for
this connection.
Bootstrap control, BST
This terminal will provide the bootstrap voltage required for
the upper internal NMOS switch of the buck regulator. An
external ceramic capacitor placed between the BST input
terminal and the VSW pin will provide the necessary voltage
for the upper switch. In normal operation the capacitor is
re-charged on every low side synchronous switching action.
In the case of where the switch mode approaches 100% duty
cycle for the high side FET, the device will automatically reduce
the duty cycle switch to a minimum off time on every 8th cycle
to allow this capacitor to re-charge.
Sense feedback, FB
This is the input terminal for the output voltage feedback.
For the fixed mode versions, this should be hooked directly
to V
OUT. The connection on the PCB should be kept as short
as possible, and should be made as close as possible to the
capacitor. The trace should not be shared with any other
connection. (Figure 23)
For adjustable mode versions, this should be connected to
the external resistor divider. To choose the resistors, use the
following equation:
V
OUT = 0.8 (1 + RTOP/RBOT)
The input to the FB pin is high impedance, and input current
should be less than 100nA. As a result, good layout practices
are required for the feedback resistors and feedback traces.
When using the adjustable version, the feedback trace should
be kept as short as possible and minimum width to reduce
stray capacitance and to reduce the injection of noise.
For the adjustable version, the ratio of VCC/V
OUT cannot exceed
16.
Switching output, VSW
This is the switching node of the regulator. It should be
connected directly to the 3.3uH inductor with a wide, short
trace and to one end of the Bootstrap capacitor. It is switching
between VCC and PGND at the switching frequency.
Ground, GND
This ground is used for the majority of the device including the
analog reference, control loop, and other circuits.
Power Ground, PGND
This is a separate ground connection used for the low side
synchronous switch to isolate switching noise from the rest of
the device. (Figure 23)
Enable, EN
This is the input terminal to activate the regulator. The input
threshold is TTL/CMOS compatible. It also has an internal pull-
up to ensure a stable state if the pin is disconnected.


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