STBB3J
2 A, high efficiency single inductor
buck-boost DC-DC converter
Datasheet
-
production data
Applications
•
Single cell Li-Ion, two-cell and three-cell
alkaline, Ni-MH powered devices
•
Memory card supply
•
Tablet, smartphones
Flip Chip 20, pitch = 0.4 mm
•
Digital cameras
Features
•
Input voltage range from 1.8 V to 5.5 V
•
2 A output current at 3.3 V in buck mode (V
IN
=
3.6 V to 5.5 V)
•
800 mA output current at 3.3 V in boost mode
(V
IN
2.0 V)
•
Typical efficiency higher than 94%
•
± 2% DC feedback voltage tolerance
•
Automatic transition between step-down and
boost mode
•
Adjustable output voltage from 1.2 V to 5.5 V
•
Power save mode (PS) at light load
•
2.0 MHz fixed switching frequency
•
Adjustable switching frequency up to 2.4 MHz
(by external synchronous square signal)
•
Device quiescent current less than 50
μA
•
Load disconnect during shutdown
•
Shutdown function and soft-start
•
Shutdown current < 1
μA
•
Available in Flip Chip 20, pitch = 0.4 mm
Description
The STBB3J is a fixed frequency, high efficiency,
buck-boost DC-DC converter which provides
output voltages from 1.2 V to 5.5 V starting from
input voltage from 1.8 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 cell lithium-Ion applications
where the output voltage is within the battery
voltage range. The low-R
DS(on)
N-channel and P-
channel MOSFET switches are integrated and
contribute to achieve high efficiency. The MODE
pin allows the selection between auto mode and
forced PWM mode, taking advantage from either
lower power consumption or best dynamic
performance.The device also includes soft-start
control, thermal shutdown, and current limit. The
STBB3J is packaged in Flip Chip 20 bumps with
2.5 x 1.75 mm.
Table 1. Device summary
Order code
STBB3JR
Part number
STBB3J
Marking
BB3
Packing
Flip Chip 20
Output voltage
Adjustable
December 2015
This is information on a product in full production.
DocID025263 Rev 5
1/25
www.st.com
25
Contents
STBB3J
Contents
1
2
3
4
5
6
7
Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.1
7.2
7.3
7.4
Dual mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
External synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Protection features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.4.1
7.4.2
7.4.3
Soft-start and short-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1
8.2
8.3
8.4
Programming the output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9
10
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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STBB3J
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.
Application schematic for adjustable output version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Block diagram adjustable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connection top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connection bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Efficiency vs. output current (power save mode enabled V
OUT
= 3.3 V) . . . . . . . . . . . . . . 11
Efficiency vs. output current (power save mode disabled V
OUT
= 3.3 V) . . . . . . . . . . . . . . 11
Efficiency vs. output current (PWM/auto mode V
IN
= 1.8 V). . . . . . . . . . . . . . . . . . . . . . . . 11
Efficiency vs. output current (PWM/auto mode V
IN
= 3.6 V). . . . . . . . . . . . . . . . . . . . . . . . 11
Efficiency vs. output current (PWM/auto mode V
IN
= 5.0 V). . . . . . . . . . . . . . . . . . . . . . . . 11
Maximum output current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Line transient response @ V
IN
= 3 V to 3.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Line transient response @ V
IN
= 3.6 V to 3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Line transient response @ V
IN
= 3.6 V to 4 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Line transient response @ V
IN
= 4 V to 3.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Load transient response @ V
IN
= 1.8 V, I
OUT
= 100 to 300 mA . . . . . . . . . . . . . . . . . . . . . 12
Load transient response @ V
IN
= 1.8 V, I
OUT
= 300 mA to 100 mA . . . . . . . . . . . . . . . . . . 12
Load transient response @ V
IN
= 3.6 V, I
OUT
= 100 to 300 mA . . . . . . . . . . . . . . . . . . . . . 13
Load transient response @ V
IN
= 3.6 V, I
OUT
= 300 mA to 100 mA . . . . . . . . . . . . . . . . . . 13
Load transient response @ V
IN
= 5.5 V, I
OUT
= 100 to 300 mA . . . . . . . . . . . . . . . . . . . . . 13
Load transient response @ V
IN
= 5.5 V, I
OUT
= 300 to 100 mA . . . . . . . . . . . . . . . . . . . . . 13
Startup after enable @ V
IN
= 1.8 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Startup after enable @ V
IN
= 3.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Startup after enable @ V
IN
= 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Output voltage vs. output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Auto mode vs. output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Assembly layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Top layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Bottom layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Flip Chip 20 (2.5 x 1.75 mm) outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Flip Chip 20 (2.5 x 1.75 mm) recommended footprint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DocID025263 Rev 5
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Application schematic
STBB3J
1
Application schematic
Figure 1. Application schematic for adjustable output version
Table 2. Typical external components
Component
C1,C2,C3, C4
C6, C7, C8,
C9
C5
TDK-EPC
L
(1)
R1
R2
Coilcraft
TDK-EPC
C1608X7R1H104K
XFL4020-152MEB
1.5 µH
VLF403215MT-1R5N
Depending on the output voltage
Depending on the output voltage
4 x 4 x 2 mm
0603
0603
4 x 3.2 x 1.5 mm
Manufacturer
Murata
TDK-EPC
Murata
Part number
GRM188R60J106ME84
10 µF
C1608X5R1A106M
TBD
100 nF
0603
0603
Value
Size
1. Inductor used for the maximum power capability. Optimized choice can be made according to the
application conditions (see
Section 8).
Note:
All the above components refer to a typical application. Operation of the device is not limited
to the choice of these external components.
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STBB3J
Block diagram
2
Block diagram
Figure 2. Block diagram adjustable
SW1
SW2
V IN
V OUT
+
Σ
-
+
-
OS C
G ate
Driver
DMD
FB
V S UM
C OMP 1
UV LO
LOG IC
C ONT R OL
V INA
-
+
-
S HUT
DOW N
OT P
OS C
EN
EA
+
B urs t
C ontrol
OS C
C OMP 2
V R E F and
S oft-start
-
+
DMD
G ND
DE V IC E
C ONT R OL
MODE
VS UM
AM16822v1
DocID025263 Rev 5
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