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TPS62745DSST Datasheet(PDF) 10 Page - Texas Instruments

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Part # TPS62745DSST
Description  Dual-cell Ultra Low IQ Step Down Converter for Low Power Wireless Applications
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62745DSST Datasheet(HTML) 10 Page - Texas Instruments

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background image
UVLO
EN
Gate Driver
Anti
Shoot-Through
Current
Limit Comparator
SW
Softstart
Limit
High Side
VIN
GND
PMOS
NMOS
PG
PG Comp
V
TH_UVLO
VIN
UVLO
Comp
Softstart
Control
Logic
VOUT
V
OUT_SET
Comparator
Direct Control
& Compensation
Error
amplifier
Min. On
Min. OFF
VIN
VOS
Timer
DCS
Control
Current
Limit Comparator
Limit
Low Side
Power Stage
UVLO
VOUT
Vin-switch
EN
UVLO
VIN_SW
V
Selection +
Setting
OUT
V
OUT_SET
VSEL 1
VSEL 2
VSEL 3
VSEL 4
Ultra Low Power
Reference 1.2V
V
TH_PG
V
OUT
V
Discharge
OUT
V
REF
UVLO
EN
EN
EN_VIN_SW
VIN
TPS62745, TPS627451
SLVSC68A – JUNE 2015 – REVISED JUNE 2015
www.ti.com
8 Detailed Description
8.1 Overview
The TPS62745 is the first dual-cell, ultra low power step down converter combining TI's DCS-Control™ topology
and ultra low quiescent current consumption (400 nA typical) while maintaining a regulated output voltage. The
device extends high efficiency operation to output currents down to a few micro amperes.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 DCS-Control™
TI's DCS-Control™ (Direct Control with Seamless Transition into Power Save Mode) is an advanced regulation
topology, which combines the advantages of hysteretic and voltage mode control. Characteristics of DCS -
ControlTM are excellent AC load regulation and transient response, low output ripple voltage and a seamless
transition between pulse frequency modulation (PFM) and pulse width modulation (PWM) mode operation. DCS-
ControlTM includes an AC loop which senses the output voltage (VOUT pin) and directly feeds the information to
a fast comparator stage. This comparator sets the switching frequency, which is constant for steady state
operating conditions, and provides immediate response to dynamic load changes. In order to achieve accurate
DC load regulation, a voltage feedback loop is used. The internally compensated regulation network achieves
fast and stable operation with small external components and low ESR capacitors. The DCS-ControlTM topology
supports PWM mode for medium and high load conditions and a power save mode at light loads. During PWM
mode, it operates in continuous conduction. The switching frequency is up to 2.5 MHz with a controlled frequency
variation depending on the input voltage. If the load current decreases, the converter seamlessly enters power
save mode to maintain high efficiency down to very light loads. In power save mode the switching frequency
varies linearly with the load current. Since DCS-ControlTM supports both operation modes within one single
building block, the transition from PWM to power save mode is seamless without effects on the output voltage.
The TPS62745 offers both excellent DC voltage and superior load transient regulation, combined with very low
10
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Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: TPS62745 TPS627451


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