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TPS61045DRBR Datasheet(PDF) 8 Page - Texas Instruments

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Part # TPS61045DRBR
Description  Digitally Adjustable Boost Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61045DRBR Datasheet(HTML) 8 Page - Texas Instruments

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IN
P(typ)
V
I
= 375 m A +
x 100 ns
L
IN
P(typ)
(LIM)
V
I
= I
+
x 100 ns
L
FB
PGND
SW
VIN
CTRL
+
Current Limit
S
R
CTRL
L
DO
GND
Q1
Input switch
400 ns Min
Off T ime
UVLO
Bias Supply
Gate
Driver
Gate
Driver
RS Latch
Logic
6 µs Max
On Time
Vref = 1.233 V
Digital
Interface
6-Bit DAC
Soft
Start
Q2
Main Switch
Rsense
Error Comparator
TPS61045
SLVS440C – JANUARY 2003 – REVISED DECEMBER 2014
www.ti.com
7
Detailed Description
7.1 Overview
The TPS61045 device operates with an input voltage range of 1.8 to 6 V and generates output voltages up to 28
V. The device operates in a pulse frequency modulation (PFM) scheme with constant peak current control. This
control scheme maintains high efficiency over the entire load current range, and with a switching frequency of up
to 1 MHz, the device enables the use of small external components.
The converter monitors the output voltage. When the feedback voltage falls below the reference voltage of
1.233 V (typical), the main switch turns on and the current ramps up. The main switch turns off when the inductor
current reaches the internally set peak current of 375 mA (typical). See Peak Current Control for more
information. The second criteria that turns off the main switch is the maximum on-time of 6
μs (typical). This limits
the maximum on-time of the converter in extreme conditions. As the switch is turned off, the external Schottky
diode is forward biased delivering the current to the output. The main switch remains off until the minimum off
time of 400 ns (typical) has passed and the feedback voltage is below the reference voltage again. Using this
PFM peak current control scheme, the converter operates in discontinuous conduction mode (DCM) where the
switching frequency depends on the input voltage, output voltage, and output current. This gives a high efficiency
over the entire load current range. This regulation scheme is inherently stable, which allows a wider range for the
selection of the inductor and output capacitor.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Peak Current Control
The internal switch is turned on until the inductor current reaches the typical dc current limit (ILIM) of 375 mA. Due
to the internal current limit delay of 100 ns (typical), the actual current exceeds the dc current limit threshold by a
small amount. The typical peak current limit can be calculated:
(1)
(2)
The higher the input voltage and the lower the inductor value, the greater the current limit overshoot.
8
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Copyright © 2003–2014, Texas Instruments Incorporated
Product Folder Links: TPS61045


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