TPS62745_16 Datasheet, PDF (1/34 Pages) Texas Instruments – Dual-cell Ultra Low IQ Step Down Converter for Low Power Wireless Applications

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TPS62745, TPS627451
SLVSC68A – JUNE 2015 – REVISED JUNE 2015
TPS62745 Dual-cell Ultra Low I_Q Step Down Converter for Low Power Wireless
Applications
1 Features
•1 Input Voltage Range V_IN from 3.3 V to 10 V
• Typical 400 nA Quiescent Current
• Up to 90% efficiency with load currents >15 µA
• Up to 300 mA Output Current
• RF Friendly DCS-Control™
• Low Output Ripple Voltage
• 16 Selectable Output Voltages from
– 1.8 V to 3.3 V (TPS62745)
– 1.3 V to 2.8 V (TPS627451)
• Integrated input voltage switch
• Integrated Discharge Function at VOUT
• Open Drain Power Good Output
• Operates with a Tiny 3.3 µH or 4.7 µH Inductor
• Small 3 mm x 2 mm WSON Package
2 Applications
• Bluetooth® Low Energy, RF4CE, Zigbee
• Industrial Metering
• Energy Harvesting
3 Description
The TPS62745 is a high efficiency ultra low power
synchronous step down converter optimized for low
power wireless applications. It provides a regulated
output voltage consuming only 400-nA quiescent
current. The device operates from two rechargeable
Li-Ion batteries, Li-primary battery chemistries such
as Li-SOCl2, Li-SO2, Li-MnO2 or four to six cell
alkaline batteries. The input voltage range up to 10 V
allows also operation from a USB port and thin-film
solar modules. The output voltage is set with four
VSEL pins between 1.8 V and 3.3 V for TPS62745 or
1.3 V and 2.8 V for TPS627451. TPS62745 features
low output ripple voltage and low noise with a small
output capacitor. An internal input voltage switch
controlled by pin EN_VIN_SW connects the supply
voltage to pin VIN_SW. The switch is intended to be
used for an external voltage divider, scaling down the
input voltage for an external ADC. The switch is
automatically opened when the supply voltage is
below the undervoltage lockout threshold. The
TPS62745 is available in a small 12 pin 3 mm × 2
mm WSON package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS62745
TPS627451
WSON
3 mm x 2 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Typical Application Schematic
spacer
spacer
VIN = 3.3 V to 10 V
CIN
10 µF
TPS62745
VIN
SW
EN
VOUT
EN_VIN_SW
PG
VSEL1
VSEL2
VSEL3
VSEL4
VIN_SW
GND
4.7 µH
L
VOUT = 1.8 V
COUT
10 µF
1
Efficiency vs Output Current; Vo = 3.3 V
100
90
80
70
60
50
40
30
20
10
0
12
V_IN = 4.0V
V_IN = 5.0V
V_IN = 6.0V
V_IN = 7.2V
V_IN = 8.4V
V_IN = 10.0V
102
1002
1m
10m
100m
Output Current (A)
D001
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.