STBB1-AXX
Datasheet
High efficiency single inductor dual mode buck-boost DC-DC converter with 2.3 A
switches peak current
Features
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Buck-boost DC-DC converter
Operating input voltage range from 2.0 V to 5.5 V
2% DC feedback voltage tolerance
Synchronous rectification
Shutdown function
1.5 MHz switching frequency
Power save mode at light load
Typical efficiency: > 94%
2.3 A switches peak current limit at 3.3 V
Shutdown current < 1 µA
Available in DFN10 (3 x 3 mm)
DFN10 3 x 3
Applications
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Maturity status link
STBB1-AXX
Device summary
Order code
Package
Packing
STBB1-APUR
DFN10 (3 x 3 mm)
Tape and reel
Single cell Li-Ion and 3 cells alkaline, Ni-MH powered devices
SD/MMC memory card supply
Smart metering system
Point of load regulation
Portable equipment, IoT module
Description
The
STBB1-AXX
is a fixed frequency, high efficiency, buck-boost DC-DC converter
able to provide output voltages ranging from 1.2 V to 5.5 V and input voltages from
2.0 V to 5.5 V. The device can operate with input voltages higher than, equal to, or
lower than the output voltage making the product suitable for single lithium-Ion,
multicell alkaline or NiMH applications where the output voltage is within the battery
voltage range. The integrated low-R
DS(on)
N-channel and P-channel MOSFET
switches contribute to its high efficiency. The mode pin allows the selection between
auto mode and forced PWM mode thus taking benefit either of lower power
consumption or better dynamic performance. The device also includes soft-start
control, thermal shutdown and current limit. The
STBB1-AXX
is packaged in DFN10
(3 x 3 mm).
DS8642
-
Rev 5
-
March 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
STBB1-AXX
Absolute maximum ratings
2
Absolute maximum ratings
Table 1.
Absolute maximum ratings
Symbol
VINA, VIN
VOUT
SW1, SW2
FB
MODE/SYNC, EN
T
J
T
STG
T
JOP
ESD
Input voltage
Output voltage
DC voltage
DC voltage
DC voltage
Maximum junction temperature
Storage temperature range
Operating junction temperature range
Human body model
Parameter
Value
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 1.5
-0.3 to 7
150
-65 to +150
-40 to +85
2
Unit
V
V
V
V
V
°C
°C
°C
kV
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional
operation under these conditions is not implied.
Table 2.
Thermal data
Symbol
R
THJC
R
THJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
Value
2.96
30.9
Unit
°C/W
°C/W
DS8642
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Rev 5
page 3/23
STBB1-AXX
Pin configuration
3
Pin configuration
Figure 2.
Pin connection (top view)
Table 3.
Pin description
Pin
1
2
3
4
5
6
7
Symbol
VOUT
SW2
PGND
SW1
VIN
EN
MODE /SYNC
Output voltage
Switch pin. Internal switches are connected to this pin. Connect inductor between SW1
to SW2
Power ground
Switch pin. Internal switches are connected to this pin. Connect inductor between SW1
and SW2
Power input voltage. Connect a ceramic bypass capacitor (10 µF minimum) between
this pin and PGND
Enable pin. Connect this pin to GND or a voltage lower than 0.4 V to shut down the IC.
A voltage higher than 1.2 V is required to enable the IC
Operation mode selection. If MODE pin is low, the STBB1-AXX automatically switches
between pulse skipping and fixed frequency PWM according to the load level. If MODE
pin is pulled high, the STBB1-AXX works in PWM mode. When a square waveform is
applied, this pin provides the clock signal for oscillator synchronization
Supply voltage for control stage
Signal ground
Feedback voltage
Power ground
Name and function
8
9
10
VINA
GND
FB
Exposed pad
DS8642
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Rev 5
page 4/23
STBB1-AXX
Typical application
4
Typical application
Figure 3.
Application circuit (adjustable output version)
L
S W1
V IN
V IN
C IN
V INA
S W2
V OUT
V OUT
C OUT
R1
EN
S T BB 1-AXX
-
FB
MODE /S Y NC
G ND
P G ND
R2
Table 4.
List of external components
Component
CIN
COUT
L
R1
(1)
R2
(1)
Manufacturer
Murata
Murata
TDK
Coilcraft
Part number
GRM21BR71A106KE51L
GRM21BR60J226ME39L
VLCF4020T-2R2N1R7
XFL4020-222ME
560 kΩ (V
O
= 3.3 V)
100 kΩ
Value
10 µF
22 µF
2.2 µH
Size
0805
0805
4x4x2
4x4x2
0402
0402
See below note
1. R1 and R2 are calculated according to the following formula: R1 = R2 x (VOUT/VFB - 1). Suggested value for R2 is 100 kΩ.
In order to reduce the quiescent current a maximum value of 500 kΩ is possible.
Note:
The above listed components refer to a typical application. The STBB1-AXX operation is not limited to the
choice of these components.
DS8642
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Rev 5
page 5/23
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