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PDF SiP1759 Data sheet ( Hoja de datos )
| Número de pieza | SiP1759 | |
| Descripción | Buck-Boost Regulator | |
| Fabricantes | Vishay Intertechnology | |
| Logotipo |  |
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New Product
Buck-Boost Regulator
SiP1759
Vishay Siliconix
www.DataSheet4U.com
FEATURES
D Output Voltage—Fixed 3.3 V or Adjustable from 2.5 V to
5.5 V
D 1.6-V to 5.5-V Input Voltage Range
D 100-mA Output Current
D 60-mA Quiescent Current
D Shutdown Current <1 mA
D Short Circuit Protection
D Thermal Shutdown
D MSOP-10 Package
APPLICATIONS
D 1-Cell Li Ion Battery Powered Equipment
D 2- to 3-Cell NiMH Battery Powered Equipment
D 2- to 3-Cell Alkaline Battery Powered Equipment
D Backup Battery Boost Converters
DESCRIPTION
The SiP1759 is a buck-boost regulating charge pump. It is
designed to provide a regulated output from 1-cell Li Ion or
2/3-cell NiMH voltages found in handheld portable equipment,
1.6 V to 5.5 V. SiP1759 allows the option of a fixed 3.3-V output
voltage, or an adjustable output which can be set from 2.5 V to
5.5 V. The output current is up to 100 mA.
For flexibility in application, SiP1759 has a shutdown pin (SD)
and an ERROR output to indicate when the output voltage is
in regulation.
SiP1759 is available in a 10-pin MSOP package and is rated
over the industrial temperature range of −40 to 85 _C.
TYPICAL APPLICATION CIRCUIT
CX
CX−
VIN
CX+
VOUT
CiN SiP1759
R COUT
SD
GND
PGND
ERROR
FB
Fixed Output
CX
CX−
CX+
VIN VOUT
PGND
CiN SiP1759
R R1 COUT
SD
GND
PGND
ERROR
FB
R2
Adjustable Output
Document Number: 72949
S-40643—Rev. A, 12-Apr-04
www.vishay.com
1
1 page  
New Product
SiP1759
Vishay Siliconix
www.DataSheet4U.com
DESIGN CONSIDERATIONS
Setting the Adjustable Output Voltage
The SiP1759 regulated output can be adjusted from 2.5 V to
5.5 V via resistor divider network from VOUT to GND (See
Typical Application Circuits). R1 and R2 should be kept in the
50-kW to 100-kW range for low power consumption, while
maintaining adequate noise immunity. The value R1 is
calculated using the following formula:
R1=R2{(VOUT/VFB)-1}
VFB is nominally 1.235V.
Capacitor Selection
Capacitor selection for CIN, COUT and CX will have an impact
on the voltage output ripple, output current and overall physical
size of the circuit.
Ceramic capacitors are recommenced for their low ESR which
will help keep the output voltage ripple at a minimum. The
initial values for the CIN and COUT capacitors should be 10 mF,
the CX capacitor should be 0.33 mF.
Output Ripple
The SiP1759 automatically decides whether to be in step up
mode or step down mode depending on the VIN, VOUT and
current load conditions, therefore the voltage output ripple will
vary. In step-up mode the voltage output ripple is higher than
step-down mode. But unless VIN is significant larger than VOUT
(VIN w VOUT + 1 V) , in heavy load the IC will slip from buck
mode to boost mode as necessary to charge the transfer
capacitor and the ripple will increase. Reducing the CX
capacitor value will cause an increase in the switching
frequency and a reduction of the output ripple.
TYPICAL CHARACTERISTICS
Efficiency vs. Input Voltage
120
100 IOUT @ 10 mA
IOUT @ 50 mA
80 IOUT @ 100 mA
60
40
20
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Start-Up Input Voltage
4.0
3.5 (VOUT < VIN) RLOAD = 33 W
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Document Number: 72949
S-40643—Rev. A, 12-Apr-04
Quiescent Current vs. Input Voltage (No Load)
1.00E-01
1.00E-02
1.00E-03
1.00E-04
1.00E-05
1.00E-06
1.00E-07
0.5
1.5
2.5 3.5
Input Voltage (V)
4.5
5.5
Output voltage Ripple vs. Input Voltage
0.20
0.16
0.12
100 mA
0.08
50 mA
0.04
10 mA
0.00
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
www.vishay.com
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5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet SiP1759.PDF ] | |
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