ST1PS01
Datasheet
400 mA nano-quiescent synchronous step-down converter with digital voltage
selection and Power Good
Features
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500 nA input quiescent current at V
IN
=3.6 V (not switching)
94% typical efficiency at 1 mA load (V
IN
=3.6 V, V
OUT
=3.3 V)
100% duty cycle
1.8 V to 5.5 V input operating range
Undervoltage lockout: 1.57 V (V
IN
falling, typ.)
Up to 400 mA output current capability
Low power control operation for the best efficiency
Embedded soft-start circuit
Tiny external components: L=2.2 µH typ.
Selectable output voltages: 1.8 V to 3.3 V
Output voltage Power Good
±1.5% output voltage accuracy (V
OUT
, T
A
=25 °C)
Dynamic output voltage selection (D0, D1)
Available in Flip-Chip package
Applications
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Wearable applications
Personal tracking monitors
Smart watches, sport bands
Energy harvesting, wireless sensors
Wearable and fitness accessories
Industrial sensors, portable low power devices
Single cell Li-Ion battery applications
Bluetooth
®
low energy
Zigbee
Product status link
ST1PS01
Product summary
ST1PS01AJR
Order code
ST1PS01DJR
ST1PS01EJR
1.9 V, 2.0 V, 2.1 V,
2.8 V (A vers.)
Output voltages
1.8 V, 2.3 V, 2.5 V,
2.8 V (D vers.)
1.8 V, 2.7 V, 3.0 V,
3.3 V (E vers.)
Flip-Chip
Package
(1.11x1.41mm)
400 µm pitch
Description
The
ST1PS01
is a nano-quiescent miniaturized synchronous step-down converter,
which is able to provide up to 400 mA output current with an input voltage ranging
from 1.8 V to 5.5 V. This converter is specifically designed for applications where high
efficiency, PCB size and thickness are the key factors. The output voltage can be set
using two digital control inputs, a V
OUT
from 1.8 V to 3.3 V can be dynamically
selected. Thanks to the enhanced PCC (peak current control) the
ST1PS01
reaches
very high efficiency conversion using just a 2.2 µH inductor and two small capacitors.
Advanced design circuitry is implemented to minimize the quiescent current. The
device is available in Flip-Chip package.
DS12799
-
Rev 2
-
December 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
ST1PS01
Application schematic
1
Application schematic
Figure 1.
ST1PS01 application schematic
EN
V
IN
C
IN
VIN
H/L
H/L
D0
D1
PGOOD
L
SW
VOUT
GND
R
PU
V
OUT
C
OUT
Vcc
GPIO
ST1PS01
Low voltage system
GND
Table 1.
Typical external components
Component
C
IN
C
OUT
L
R
PU
Description
Ceramic capacitor with low ESR values
Ceramic capacitor with low ESR values
Inductor
Pull-up resistor
Value
10 µF
10 µF
2.2 µH
1 MΩ
Size - imperial (metric)
0603 (1608)
0603 (1608)
0806 (2016)
0402 (1005)
DS12799
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Rev 2
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ST1PS01
Pin configuration (top through view)
2
Pin configuration (top through view)
Figure 2.
Flip-Chip8 package
1
A
B
C
D
E
PGOOD
2
3
V
IN
D1
EN
D0
GND
SW
V
OUT
Table 2.
Pin description
Name
V
IN
SW
V
OUT
EN
GND
D1
D0
PGOOD
Bump name
A3
C3
E3
B2
D2
A1
C1
E1
Description
Input supply voltage. Bypass this pin to ground with a 10 µF capacitor
Switching node. Inductor connection
Sense pin used to monitor output voltage
Enable pin. High logic level turns on the IC. V
IN
referred
Ground
Output voltage selection inputs (Refer to the
Table 7. Output voltage settings
for order codes and
configuration matrix)
Open drain output. It is in high impedance when the output voltage reaches 97.5% of the target V
OUT
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Rev 2
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ST1PS01
Functional pin description
3
Functional pin description
GND
Device ground pin.
VIN
Supply voltage. This pin supplies power to the internal analog and digital circuitries when voltage is higher than
V
UVLO
. Bypass this pin to GND with a 10 μF ceramic capacitor. Input capacitor C
IN
must be chosen with low ESR
to reduce the input voltage ripple.
SW
Inductor connection to internal PMOS and NMOS switches.
VOUT
Output voltage sense input. It provides the feedback voltage level to the regulation circuitry. 10 µF output
capacitor C
OUT
must be connected close to the pin or through a short trace and should have low ESR to reduce
the output voltage ripple.
EN
Enable pin. A logic low level on this pin disables the device. High level enables the device. Do not leave this pin
floating.
D1, D2
Output voltage selection pins. See the
Table 7. Output voltage settings
for V
OUT
selection. Do not leave these
pins floating. These pins can be dynamically changed during operation.
PGOOD
Power Good open drain output. If used it requires a pull-up resistor to hold a high level signal. High impedance
indicates that V
OUT
is above proper good threshold.
DS12799
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Rev 2
page 4/20
ST1PS01
Maximum ratings
4
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
V
IN
EN, D0, D1
V
OUT
, SW
PGOOD
T
AMB
T
J
T
STG
Parameter
Power and signal supply voltage
Logic input pins
Output signal monitoring and switching pins
Power Good open drain output pin
Operating ambient temperature
Junction temperature
Storage temperature
Value
- 0.3 to + 6.5
- 0.3 to + 6.5
-0.3 to V
IN
+ 0.3
- 0.3 to + 6.5
-40 to 85
-40 to 125
-55 to 150
Unit
V
V
V
V
°C
°C
°C
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional
operation under these conditions is not implied
Table 4.
Thermal data
Symbol
R
thJA
Parameter
Thermal resistance junction-ambient
Flip-Chip8
60
Unit
°C/W
Table 5.
Recommended operating conditions
Symbol
V
IN
Parameter
Input supply voltage
Min.
1.8
Typ.
Max.
5.5
Unit
V
DS12799
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Rev 2
page 5/20
