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PDF STBB1-APUR18 Data sheet ( Hoja de datos )
| Número de pieza | STBB1-APUR18 | |
| Descripción | 1A high efficiency single inductor dual mode buck-boost DC-DC converter | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STBB1-AXX
1 A, high efficiency single inductor
dual mode buck-boost DC-DC converter
Features
■ 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%
■ 1 A output current capability
■ Shutdown current < 1 µA
■ Available in DFN10 (3 x 3 mm)
Applications
■ Single cell Li-Ion and 3 cells alkaline, Ni-MH
powered devices
■ SD/MMC memory card supply
■ Palmtop computers
■ Cell phones
■ Digital cameras
DFN10 (3 x 3 mm)
integrated low-RDSon N-channel and P-channel
MOSFET switches contribute to its high efficiency.
The MODE pin allows selecting between auto
mode and forced PWM mode thus taking benefit
either of lower power consumption or best
dynamic performance. The device includes also
soft-start control, thermal shutdown and current
limit. The STBB1-A is packaged in DFN10 (3 x 3
mm).
Description
The STBB1-A 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
Table 1. Device summary
Order code
Marking
STBB1-APUR
BB1-A
Output voltage
ADJ
October 2011
Doc ID 022197 Rev 2
1/22
www.st.com
22
http://www.Datasheet4U.com
1 page  
STBB1-AXX
3 Pin configuration
Figure 2. Pin connections (top through view)
Pin configuration
Table 4.
Pin n°
1
2
3
4S
5V
6E
7
8
9
10
Pin description
Symbol
VOUT
SW2
PGND
W1
IN
N
MODE
(SYNC)
VINA
GND
FB
Exposed pad
Name and function
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-A automatically switches between pulse
skipping and fixed frequency PWM according to the load level.
If MODE pin is pulled high, the STBB1-A works always 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
Doc ID 022197 Rev 2
5/22
5 Page 
STBB1-AXX
Detailed description
6.3 External
synchronization
The STBB1-A implements external synchronization pin. If and external clock signal is
applied to the MODE (SYN) pin with a frequency between 1.35 MHz and 2.0 MHz and with
proper low/high levels, the device automatically goes in PWM mode and the external clock is
used as switching oscillator.
6.4 Enab le pin
The device operates when EN pin is set high. If EN pin is set low the device stops switching,
all the internal blocks are turned off. In this condition the current drawn from VIN/VINA is
below 1 µA in the whole temperature range. In addition the internal switches are in off state
so the load is electrically disconnected from the input, this avoids unwanted current leakage
from the input to the load.
6.5 Pr
otection features
The STBB1-A implements different types of protection features.
6.5.1
Soft-start and short-circuit
After the EN pin is pulled high, or after a suitable voltage is applied to VIN, VINA and EN the
device initiates the startup phase. The average current limit is set to 400 mA at the
beginning and is gradually increased while tracking the output voltage increase. As soon the
output voltage reaches 1.0 V the average current limit is set to its nominal value.
This method allows for a current limit proportional to the output voltage. If there is a short in
the VOUT pin, the output current will not exceed 400 mA.
This process is not handled by a timer so the device is also able to start up even with large
capacitive loads.
6.5.2 Under voltage lockout
The undervoltage lockout function prevents improper operation of STBB1-A when the input
voltage is not high enough. When the input voltage is below the VUVLO threshold the device
is in shutdown mode. The hysteresis of 100 mV prevents unstable operation when the input
voltage is close to the UVLO threshold.
6.5.3 Over -temperature protection
An internal temperature sensor continuously monitors the IC junction temperature. If the IC
temperature exceeds 140 °C typically the device stops operating. As soon as the
temperature falls below 120 °C typically normal operation is restored.
Doc ID 022197 Rev 2
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet STBB1-APUR18.PDF ] | |
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