ST1PS02
Datasheet
400 mA nano-quiescent synchronous step-down converter with digital voltage
selection, Power Good and AUX switch
Features
•
500 nA input quiescent current at VIN = 3.6 V (not switching)
•
92% typical efficiency at 10 mA load (VIN = 3.6 V, VOUT = 2.5 V)
•
•
•
100% duty cycle
1.8 V to 5.5 V input operating range
Undervoltage lockout: 1.57 V (VIN 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.
Settable inductor current limitation
Selectable output voltages: 1.0 V to 3.3 V
Output voltage Power Good
±1.5% output voltage accuracy (VOUT, TA = 25 °C)
•
•
•
Dynamic output voltage selection (D0, D1 and D2)
Auxiliary load switch Vout2 (AUX control input)
Available in TQFN12 package
Applications
Product status link
ST1PS02
•
•
•
•
•
•
•
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
Description
The ST1PS02 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 three digital control inputs, a VOUT from 1.0 V to 3.3 V can be dynamically
selected. Thanks to the enhanced PCC (peak current control) the ST1PS02 reaches
very high efficiency conversion using just a 2.2 µH inductor and two small capacitors.
The device embeds a controlled load switch to supply a subsystem with same
voltage rail. Advanced design circuitry is implemented to minimize the quiescent
current. The device is available in thin plastic package.
DS13206 - Rev 4 - July 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
ST1PS02
Application schematic
1
Application schematic
Figure 1. ST1PS02 application schematic
Table 1. Typical external components
DS13206 - Rev 4
Component
Description
Value
Size - imperial (metric)
C1
Ceramic capacitor with low ESR values
C2, C3
Ceramic capacitor with low ESR values
10 µF
0603 (1608)
L1
Inductor
2.2 µH
0806 (2016)
R1
Pull-up resistor
1 MΩ
R2
Current limit resistor
0Ω
0402 (1005)
page 2/26
ST1PS02
Pin configuration
2
Pin configuration
Figure 2. TQFN12 package (top through view)
Table 2. Pin description
DS13206 - Rev 4
Name
Bump name
Description
AUX
1
Enable for the auxiliary output voltage
VIN
2
Input supply voltage. Bypass this pin to ground with a 10 μF capacitor
SW
3
Switching output. Inductor connection
GND
4
Ground
VOUT
5
Sense pin used to monitor output voltage
Vout2
6
Auxiliary output pin with OCP (100 mA max. load)
PGOOD
7
Open drain output. It is in high impedance when the output voltage reaches 97.5% of the target VOUT
CL
8
Current limit set. Connect to GND sets the default value (750 mA min.). An external resistor
connected to GND can be used to adjust this parameter with a lower value (resistor values are
reported on Table 6. Electrical characteristics
D0
9
D1
10
D2
11
EN
12
Output voltage selection inputs ( refer to Table 7. Output voltage settings)
Enable pin. High logic level turns on the IC
page 3/26
ST1PS02
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
VUVLO. Bypass this pin to GND with a 10 μF ceramic capacitor. Input capacitor C1 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 C2 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.
D0, D1, D2
Output voltage selection pins. See Table 7. Output voltage settings for VOUT 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 VOUT is above proper good threshold.
AUX
Load switch selection pins. Vout2 output is activated when this pin is at high level. Held to ground if auxiliary
output (Vout2) is not used or if it should be disabled.
Vout2
Auxiliary output. It provides the same regulated voltage level as main output (VOUT) less drop on the load switch
circuitry. 10 µF output capacitor C3 must be connected close to the pin or through a short trace and should have
low ESR to reduce the output voltage ripple. This output is controlled from a soft-start circuit, if unused can be left
open.
CL
Current limit threshold input. Held to ground if not used and default current limitation is the proper value. For
smaller current values a pull-down resistor must be used.
DS13206 - Rev 4
page 4/26
ST1PS02
Maximum ratings
4
Maximum ratings
Table 3. Absolute maximum ratings
Symbol
Parameter
Value
Unit
Power and signal supply voltage
- 0.3 to + 6.5
V
Logic input pins
- 0.3 to + 6.5
V
Current limitation input pin
- 0.3 to + 6.5
V
-0.3 to VIN + 0.3
V
Load switch output pin
- 0.3 to + 6.5
V
Power Good open drain output pin
- 0.3 to + 6.5
V
Operating ambient temperature
-40 to 85
°C
TJ
Junction temperature
-40 to 125
°C
TSTG
Storage temperature
-55 to 150
°C
VIN
EN, D0, D1, D2, AUX
CL
VOUT, SW
Vout2
PGOOD
TAMB
Note:
Output signal monitoring and switching pins
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
RthJA
Parameter
Thermal resistance junction-ambient
TQFN12
Unit
75
°C/W
Table 5. Recommended operating conditions
Symbol
VIN
DS13206 - Rev 4
Parameter
Input supply voltage
Min.
1.8
Typ.
Max.
Unit
5.5
V
page 5/26
ST1PS02
Electrical characteristics
5
Electrical characteristics
C1= 10 µF, C2= 10 µF, C3= 10 µF, L1=2.2 µH, R1 = 1 MOhm, R2 = 0 Ohm, VIN=3.6 V, VEN= VIN, VOUT=1.8 V,
TA=25 °C unless otherwise specified.
Table 6. Electrical characteristics
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
General section
EN=VIN, AUX=GND,
IQ
Quiescent current
device does not switch (VOUT pin voltage > VOUT setting
value),
-
500 1000
nA
EN=GND, shutdown current into VIN
-
10
200
nA
VIN rising
-
1.63 1.72
V
VIN= VOUT_min.+0.3 V (1.8 V min.) to 5.5 V
ISD
VUVLO
Shutdown current
Undervoltage lockout
threshold
VIN falling
1.51 1.57
-
V
mV
Hysteresis
-
65
-
Vth100%+ 100% mode leave threshold
VIN rising, 100% mode is disabled with VIN = VOUTnom +
Vth100%+
-
300
-
Vth100%- 100% mode enter threshold
VIN falling, 100% mode is entered with VIN = VOUTnom +
Vth100%-
-
200
-
mV
Output voltage
Output voltage range
Output voltages are selected with pins D0, D1, D2
1.0
-
3.3
V
Output voltage accuracy
VIN = 3.6 V, whole VOUT range, IOUT=100 mA
-1.5
-
1.5
%
tONmin
Minimum on-time
VIN = 3.6 V, VOUT= 2 V, IOUT= 0 A
-
225
-
ns
tOFFmin
Minimum off-time
VIN=2.3V
-
50
-
ns
tstartupd
Start-up delay time
VEN from low to high, VIN = 3.6 V, VOUT = 1.8 V
-
1.7
-
ms
ROUTDIS
Output discharge MOSFET
on-resistance
VEN= GND
-
30
-
Ω
-
-
0.3
1.1
-
-
VOUT
Logic inputs (EN, D0, D1, D2) AUX
VIL
VIH
Low level input voltage
threshold
High level input voltage
threshold
VIN=1.8 V to 5.5 V
V
Power switch
RDS(on)
High-side MOSFET onresistance
Low-side MOSFET onresistance
For ST1PS02AQTR and ST1PS02DQTR:
1.8 V≤VIN≤5.5 V,CL=GND
ILIM1
High-side MOSFET switch
current limit
For ST1PS02BQTR: 2.1 V≤VIN≤5.5 V,
CL=GND
For ST1PS02CQTR: 2.9 V≤VIN≤5.5 V,
CL=GND
DS13206 - Rev 4
-
0.45 0.60
-
0.23 0.35
500
850 1150
650
850 1150
650
850 1150
VIN = 3.6 V, Isw = 100 mA
Ω
mA
page 6/26
ST1PS02
Electrical characteristics
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
ILIM2
High-side MOSFET switch
current limit
1.8 V ≤ VIN ≤ 3.6 V, R2=1 MΩ
500
650
800
mA
ILIM3
High-side MOSFET switch
current limit
1.8 V ≤ VIN ≤ 3.6 V, R2=2.2 MΩ
180
250
360
mA
Rising output voltage on VOUT pin, referred to VOUT
selected (D0, D1, D2)
95
97.5
-
Hysteresis
-4
-3.5
-2.5
1.8 V ≤ VIN ≤ 5.5 V, EN = GND, current into PGOOD pin,
IPGOOD = 4 mA
-
-
0.23
Power Good output (PGOOD)
Vthpg
VthpgH
VOL
Power Good threshold
voltage
Low level output voltage
%
V
Auxiliary output (Vout2)
RAUX
Load switch on-resistance
IOUT2 = 100 mA, Aux=VIN, VOUT=2 V
Rdisc2
Auxiliary output discharge
MOSFET on-resistance
(discharger)
IOUT2=-10 mA, Aux=GND
-
30
50
Starting with AUX low-to-high transition, time to ramp
VLOAD from 0 V to 95% VOUT = 1.4 V,
-
300
650
-
400
700
0.5
0.75 0.95
Ω
for ST1PS02AQTR: VIN = 3.6 V, IOUT2 = 1 mA
Starting with AUX low-to-high transition, time to ramp
VLOAD from 0 V to 95% VOUT = 1.8 V,
tr_aux
Vaux rise time
for ST1PS02BQTR: VIN = 3.6 V, IOUT2 = 1 mA
Starting with AUX low-to-high transition, time to ramp
VLOAD from 0 V to 95% VOUT = 2.6 V,
µs
-
400
700
-
300
600
for ST1PS02CQTR: VIN =3.6 V, IOUT2 = 1 mA
Starting with AUX low-to-high transition, time to ramp
VLOAD from 0 V to 95% VOUT = 1.1 V,
for ST1PS02DQTR: VIN = 3.6 V, IOUT2 = 1 mA
DS13206 - Rev 4
page 7/26
ST1PS02
Electrical characteristics
Table 7. Output voltage settings
Device
ST1PS02AQTR
ST1PS02BQTR
ST1PS02CQTR
ST1PS02DQTR
DS13206 - Rev 4
D2
D1
D0
VOUT
0
0
0
1.40 V
0
0
1
1.45 V
0
1
0
1.50 V
0
1
1
1.55 V
1
0
0
1.60 V
1
0
1
1.65 V
1
1
0
1.70 V
1
1
1
1.75 V
0
0
0
1.8 V
0
0
1
1.9 V
0
1
0
2.0 V
0
1
1
2.1 V
1
0
0
2.2 V
1
0
1
2.3 V
1
1
0
2.4 V
1
1
1
2.5 V
0
0
0
2.6 V
0
0
1
2.7 V
0
1
0
2.8 V
0
1
1
2.9 V
1
0
0
3.0 V
1
0
1
3.1 V
1
1
0
3.2 V
1
1
1
3.3 V
0
0
0
1.10 V
0
0
1
1.15 V
0
1
0
1.20 V
0
1
1
1.25 V
1
0
0
1.30 V
1
0
1
1.35 V
1
1
0
1.00 V
1
1
1
1.05 V
page 8/26
ST1PS02
ST1PS02 block diagram
6
ST1PS02 block diagram
Figure 3. Block diagram
VIN
PGOOD
VIN
C1
Bandgap/Bias
Vref
.
- UVLO Comp
VIN
Vuvlo
EN
VFB
-
Vref
+
+
Output
Discharge
CL
VOUT
VSW
Peak and Valley
CURRENT LIMIT
Min. ON time
Vout
Selection
Logic
Pulse freq.
detection
Compensation
VSW
Soft-start
ramp
Aux
DS13206 - Rev 4
+
-
Vref
+
+
Driver/
Anti-cross
conduction
circuitry
L
SW
d
High current
mode
VFB
PWM
CTRL
Logic
Min. OFF time
D0
VOUT
VOUT
VIN
D2
D1
R1
TON
C2
VSW
+
-
V IN
Vth 100%
Zero
Crossing
Comp.
100%
Mode
comp.
GND
+
Current slew
Rate CTRL
VOUT2
Discharge
VOUT
Vout 2
C3
page 9/26
ST1PS02
Operation description
7
Operation description
The ST1PS02 is an ultra-low quiescent new generation buck converter. It targets a very small quiescent current
consumption (typical 500 nA) and it guarantees high efficiency operation even down to few microampere loads.
It is based on a hysteretic comparator that senses the coil ripple current that is held constant in all operation
modes. The device has seamless transition between PFM (pulse frequency modulation) and PWM (pulse width
modulation) mode with low ripple and good load transient response.
In order to maintain constant ripple current on the selected coil, the device changes switching frequency, which
also depends on input supply voltage. During PWM mode (heavy load), the device operates in continuous
conduction up to 400 mA and switching frequency can reach 2 MHz maximum.
7.1
Power save mode
At light load the device enters automatically power save mode with total current consumption from the input power
supply of 500 nA typical; during this condition most of the internal blocks are turned off in order to reach ultra-low
power consumption. During this time, the load current is supported by the output capacitor.
7.2
Output voltage
The device allows the output voltage selection without an external resistor divider. Standard digital inputs are
used to configure the device to supply a fixed output voltage according to Table 7. Output voltage settings.
The VOUT pin must be connected directly and as close as possible to the inductor terminal to obtain the best
performance and get the best output voltage regulation. The output voltage can be dynamically changed to
implement voltage scaling.
7.3
Output discharge and UVLO
The device embeds a fast output discharge circuitry active when the enable pin is held to ground (EN=gnd)
or when the input supply voltage reaches the minimum voltage level set by the UVLO protection circuit
(undervoltage lock-out protection circuit). The UVLO rising threshold at 1.63 V (typ.) guarantees a proper device
supply voltage operation. The output discharge function is available for the ST1PS02xQTR versions.
7.4
Soft-start and current limitation
The device embeds a fixed soft-start circuit active during a limited time period (few ms). This feature allows
the inrush current to be minimized from the power supply in case of weak source. During this period internal
circuit reduces to 280 mA the typical switch current limit. The ST1PS02 embeds also a current limit on high side
MOSFET to protect the device against overload or short circuit on the output, during normal operation conditions.
In order to improve the flexibility, the current limit threshold can be set by an external resistor connected between
CL pin and GND. As soon as an overload (or short-circuit) is detected, the output current provided is defined by
R2 resistor. When the device enters 100% duty cycle operation condition and an overload (or short-circuit) occurs,
the output voltage is set in shutdown in order to limit the power dissipation. To restart the device operation, a LOW
to HIGH cycle on EN pin is necessary.
7.5
100% duty cycle operation
The device enters 100% duty cycle operation if the input voltage comes close to the selected output voltage.
During this mode, the regulator is turned off and output pin is directly connected to the input pin through the
high-side MOSFET. The output voltage follows the input level minus the voltage drop across the internal MOSFET
and the inductor. Once the input voltage exceeds the 100% duty cyle leave threshold, the device restarts to switch
and regulates the select output voltage again.
DS13206 - Rev 4
page 10/26
ST1PS02
Auxiliary output (Vout2)
7.6
Auxiliary output (Vout2)
The Aux pin controls Vout2 output. It provides the same regulated voltage level as the main output (VOUT) less
drop on the load switch circuitry, when Aux pin tied high. The Vout2 pin allows connecting/disconnecting the other
system load to the output of the ST1PS02.
7.7
Power Good flag
The Power Good comparator monitors the selected VOUT voltage. The Power Good open drain output is in high
impedance when the VOUT reaches the correct voltage level while it switches to low level when VOUT falls below
the normal voltage level.
DS13206 - Rev 4
page 11/26
ST1PS02
Typical performance characteristics
8
Typical performance characteristics
Figure 4. Efficiency vs load, VOUT = 1.8 V
Figure 5. Efficiency vs VIN, VOUT = 1.8 V
95%
100%
90%
90%
85%
80%
80%
Vin 2.8V
60%
Efficiency [%]
Efficiency [%]
70%
Vin 3.2V
Vin 3.6V
50%
Vin 4.2V
40%
Vin 5V
75%
Iout 100µA
Iout 1mA
70%
Iout 50mA
65%
Iout 100mA
30%
L= 2.2 µH
Cout = 10 µF
20%
10%
0%
0.001
60%
Iout 200mA
55%
L = 2.2 µH
Cout = 10 µF
50%
0.01
0.1
1
10
100
2.8
1000
3.3
3.8
4.3
4.8
Input voltage [V]
Load current [mA]
Figure 6. Efficiency vs load, VOUT = 2.5 V
Figure 7. Efficiency vs VIN, VOUT = 2.5 V
100%
100%
90%
95%
80%
90%
85%
Vin 3.2V
60%
Vin 3.6V
50%
Vin 4.2V
Efficiency [%]
Efficiency [%]
70%
Vin 5V
40%
Iout 1mA
65%
Iout 100mA
Iout 200mA
60%
10%
L=2.2 µH
Cout=10 µF
55%
50%
0.01
0.1
1
Load current [mA]
DS13206 - Rev 4
Iout 100µA
70%
Cout=10 µF
20%
0%
0.001
75%
Iout 50mA
L=2.2 µH
30%
80%
10
100
1000
3.2
3.4
3.6
3.8
4
4.2
4.4
4.6
4.8
5
Input voltage [V]
page 12/26
ST1PS02
Typical performance characteristics
DS13206 - Rev 4
Figure 8. 100% mode, VOUT = 1.8 V, 50 mA load
Figure 9. 100% mode, VOUT = 2.5 V, 50 mA load
Figure 10. VOUT change, 1.8 V to 2.5 V to 1.8 V,
IOUT = 5 mA, VIN = 3.6 V
Figure 11. Output ripple, VIN=3.6 V, VOUT = 1.8 V,
IOUT = 10 µA
Figure 12. Output ripple, VIN=3.6 V, VOUT =1.8 V,
IOUT = 1 mA
Figure 13. Output ripple, VIN=3.6 V, VOUT =1.8 V,
IOUT = 50 mA
page 13/26
ST1PS02
Typical performance characteristics
DS13206 - Rev 4
Figure 14. Output ripple, VIN=3.6 V, VOUT =1.8 V,
IOUT = 150 mA
Figure 15. Output ripple, VIN=3.6 V, VOUT =1.8 V,
IOUT = 250 mA
Figure 16. Start-up, VIN=3.6 V, VOUT=1.8 V, no load
Figure 17. Disable, VIN=3.6 V, VOUT =1.8 V, no load
Figure 18. Start-up, VIN=3.6 V, VOUT=1.8 V,
IOUT = 100 mA
Figure 19. Disable, VIN=3.6 V, VOUT = 1.8 V,
IOUT = 100 mA
page 14/26
ST1PS02
Typical performance characteristics
DS13206 - Rev 4
Figure 20. Load transient, VIN=3.6 V, VOUT=1.8 V,
IOUT =50 µA to 10 mA
Figure 21. Load transient, VIN=3.6 V, VOUT=1.8 V,
IOUT = 0 to 100 mA
Figure 22. Load transient, VIN=3.6 V, VOUT=1.8 V,
IOUT = 10 to 100 mA
Figure 23. Start-up, VIN = 3.6 V, Vout2 = 1.8 V,
no load
Figure 24. Disable, VIN = 3.6 V, Vout2 = 1.8 V,
no load
Figure 25. Start-up, VIN = 3.6, Vout2 = 1.8 V,
IOUT = 100 mA
page 15/26
ST1PS02
Typical performance characteristics
Figure 26. Disable, VIN = 3.6 V, Vout2 = 1.8 V, IOUT = 100 mA
DS13206 - Rev 4
page 16/26
ST1PS02
Package information
9
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages,
depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product
status are available at: www.st.com. ECOPACK is an ST trademark.
9.1
TQFN12 (2.0x1.7x0.55 mm) package information
Figure 27. TQFN12 (2.0x1.7x0.55 mm) package outline
DS13206 - Rev 4
page 17/26
ST1PS02
TQFN12 (2.0x1.7x0.55 mm) package information
Table 8. TQFN12 (2.0x1.7x0.55 mm) mechanical data
Symbol
Milimeters
Min.
Typ.
Max.
A
0.40
0.50
0.55
A1
0.00
0.03
0.05
A2
0.28
0.38
0.48
A3
0.125
b
0.15
0.20
0.25
D
1.60
1.70
1.80
E
1.90
2.00
2.10
e
L
0.40
0.35
0.45
aaa
0.15
bbb
0.10
ccc
0.08
ddd
0.05
eee
0.10
0.55
Figure 28. TQFN12 (2.0x1.7x0.55 mm) recommended footprint
DS13206 - Rev 4
page 18/26
ST1PS02
TQFN12 (2.0x1.70x0.55 mm) packing information
9.2
TQFN12 (2.0x1.70x0.55 mm) packing information
Figure 29. TQFN12 (2.0x1.70x0.55 mm) carrier tape outline
Figure 30. TQFN12 (2.0x1.70x0.55 mm) tape orientation
DS13206 - Rev 4
page 19/26
ST1PS02
TQFN12 (2.0x1.70x0.55 mm) packing information
Figure 31. TQFN12 (2.0x1.70x0.55 mm) reel outline
DS13206 - Rev 4
page 20/26
ST1PS02
Ordering information
10
Ordering information
Table 9. Ordering information
Order codes
ST1PS02AQTR
ST1PS02A1QTR
ST1PS02BQTR
ST1PS02B1QTR
ST1PS02CQTR
ST1PS02C1QTR
ST1PS02DQTR
ST1PS02D1QTR
DS13206 - Rev 4
Output voltages
1.40 V to 1.75 V, 50 mV steps
1.8 V to 2.5 V, 100 mV steps
2.6 V to 3.3 V, 100 mV steps
1.0 V to 1.35 V, 50 mV steps
Output discharge
Package
Packing
Yes
No
Yes
No
Yes
TQFN12
(2.0x1.7 mm)
400 μm pitch
Tape and reel
No
Yes
No
page 21/26
ST1PS02
Revision history
Table 10. Document revision history
Date
Version
17-Feb-2020
1
17-Mar-2020
2
20-Mar-2020
3
Changes
Initial release.
Updated Section 5 Electrical characteristics.
Minor text changes throughout the document.
Updated PGOOD an EN description in Table 2, IQ test condition in Table 6
and Block diagram.
Updated Figure 1. ST1PS02 application schematic.
05-Jul-2021
4
Updated Section 7.4 Soft-start and current limitation.
Updated Table 6. Electrical characteristics.
DS13206 - Rev 4
page 22/26
ST1PS02
Contents
Contents
1
Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
3
Functional pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5
Electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6
ST1PS02 block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7
Operation description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
7.1
Power save mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.2
Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.3
Output discharge and UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.4
Soft-start and current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.5
100% duty cycle operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.6
Auxiliary output (Vout2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.7
Power Good flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
9
Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
10
9.1
TQFN12 (2x1.7x0.55) package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9.2
TQFN12 (2.0x1.70x0.55 mm) packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
DS13206 - Rev 4
page 23/26
ST1PS02
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Typical external components . . . . . . . . . . . .
Pin description. . . . . . . . . . . . . . . . . . . . . .
Absolute maximum ratings . . . . . . . . . . . . .
Thermal data. . . . . . . . . . . . . . . . . . . . . . .
Recommended operating conditions. . . . . . .
Electrical characteristics . . . . . . . . . . . . . . .
Output voltage settings . . . . . . . . . . . . . . . .
TQFN12 (2.0x1.7x0.55 mm) mechanical data
Ordering information. . . . . . . . . . . . . . . . . .
Document revision history . . . . . . . . . . . . . .
DS13206 - Rev 4
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. 2
. 3
. 5
. 5
. 5
. 6
. 8
18
21
22
page 24/26
ST1PS02
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
DS13206 - Rev 4
ST1PS02 application schematic . . . . . . . . . . . . . . . . . . . . . .
TQFN12 package (top through view) . . . . . . . . . . . . . . . . . . .
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Efficiency vs load, VOUT = 1.8 V . . . . . . . . . . . . . . . . . . . . . .
Efficiency vs VIN, VOUT = 1.8 V . . . . . . . . . . . . . . . . . . . . . . .
Efficiency vs load, VOUT = 2.5 V . . . . . . . . . . . . . . . . . . . . . .
Efficiency vs VIN, VOUT = 2.5 V . . . . . . . . . . . . . . . . . . . . . . .
100% mode, VOUT = 1.8 V, 50 mA load . . . . . . . . . . . . . . . . .
100% mode, VOUT = 2.5 V, 50 mA load . . . . . . . . . . . . . . . . .
VOUT change, 1.8 V to 2.5 V to 1.8 V, IOUT = 5 mA, VIN = 3.6 V.
Output ripple, VIN=3.6 V, VOUT = 1.8 V, IOUT = 10 µA . . . . . . . .
Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT = 1 mA. . . . . . . . .
Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT = 50 mA . . . . . . . .
Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT = 150 mA . . . . . . .
Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT = 250 mA . . . . . . .
Start-up, VIN=3.6 V, VOUT=1.8 V, no load . . . . . . . . . . . . . . . .
Disable, VIN=3.6 V, VOUT =1.8 V, no load . . . . . . . . . . . . . . . .
Start-up, VIN=3.6 V, VOUT=1.8 V, IOUT = 100 mA . . . . . . . . . . .
Disable, VIN=3.6 V, VOUT = 1.8 V, IOUT = 100 mA . . . . . . . . . .
Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT =50 µA to 10 mA .
Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT = 0 to 100 mA . . .
Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT = 10 to 100 mA . .
Start-up, VIN = 3.6 V, Vout2 = 1.8 V, no load . . . . . . . . . . . . . .
Disable, VIN = 3.6 V, Vout2 = 1.8 V, no load . . . . . . . . . . . . . .
Start-up, VIN = 3.6, Vout2 = 1.8 V, IOUT = 100 mA . . . . . . . . . .
Disable, VIN = 3.6 V, Vout2 = 1.8 V, IOUT = 100 mA . . . . . . . . .
TQFN12 (2.0x1.7x0.55 mm) package outline . . . . . . . . . . . . .
TQFN12 (2.0x1.7x0.55 mm) recommended footprint . . . . . . . .
TQFN12 (2.0x1.70x0.55 mm) carrier tape outline . . . . . . . . . .
TQFN12 (2.0x1.70x0.55 mm) tape orientation . . . . . . . . . . . .
TQFN12 (2.0x1.70x0.55 mm) reel outline. . . . . . . . . . . . . . . .
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. 2
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. 9
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page 25/26
ST1PS02
IMPORTANT NOTICE – PLEASE READ CAREFULLY
STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST
products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST
products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of
Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. For additional information about ST trademarks, please refer to www.st.com/trademarks. All other product or service
names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2021 STMicroelectronics – All rights reserved
DS13206 - Rev 4
page 26/26
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湘ICP备2023018690号
