|
|
PDF MB3870 Data sheet ( Hoja de datos )
| Número de pieza | MB3870 | |
| Descripción | Pentium II DC/DC Converter IC | |
| Fabricantes | Fujitsu Media Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MB3870 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
|
No Preview Available !
FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27218-4E
ASSP For Power Supply Applications
Pentium® II DC/DC Converter IC
MB3870
s DESCRIPTION
The FUJITSU MB3870 is a pulse width modulation (PWM) DC/DC converter IC chip that provides a selection of
1.3 V to 3.5 V output voltages for Pentium®* CPU’s, using a 5-bit input signal information.
The MB3870 utilizes synchronous rectification for high efficiency and features a soft-start/discharge control
function for ease in designing power supplies in multi-supply systems, making it ideal for Pentium® II power supply
systems.
* : Pentium is the registered trademark of Intel Corporation.
s FEATURES
• Highly efficient for using synchronous rectification scheme
• On-chip soft-start/discharge control circuit
• High precision output voltage: ±1.2%
• 5-bit, 32-step DAC: 3.5 V to 2.1 V in 100 mV steps
2.05 V to 1.3 V in 50 mV steps
• Frequency range: 100 kHz to 500 kHz using variable resistance (on-chip frequency setting capacitance)
• Standby current: 0 µA TYP
• On-chip PWRGOOD circuit for output voltage state detection
• Timer-latch short-circuit protection circuit, and overvoltage protection circuit for output protection
s PACKAGE
24-pin Plastic SSOP
(FPT-24P-M03)
1 page  
MB3870
s OUTPUT VOLTAGE SETTING CODE
VD4
VD3
VD2
VD1
1000
1000
1001
1001
1010
1010
1011
1011
1100
1100
1101
1101
1110
1110
1111
1111
0000
0000
0001
0001
0010
0010
0011
0011
0100
0100
0101
0101
0110
0110
0111
0111
VD0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
VD (DC/DC converter output voltage)
(V)
3.500
3.400
3.300
3.200
3.100
3.000
2.900
2.800
2.700
2.600
2.500
2.400
2.300
2.200
2.100
0 (output OFF)
2.050
2.000
1.950
1.900
1.850
1.800
1.750
1.700
1.650
1.600
1.550
1.500
1.450
1.400
1.350
1.300
5
5 Page 
MB3870
s TYPICAL CHARACTERISTICS
Power supply current vs.
Power supply voltage characteristics
5.0 Ta = +25°C
VB = 5 V
4.0
3.0
2.0
1.0
0
0 5.0 10.0 15.0 20.0 25.0
Power supply voltage VCC (V)
Reference voltage vs. Power supply voltage characteristics
5.0
4.0
3.0
2.0
1.0
0
0 4.0 8.0 12.0 16.0 20.0
Power supply voltage VCC (V)
VREF vs. Temperature characteristics
3.60
VCC = 5 V, VB = 5 V, RT = 130 kΩ
3.55
3.50
3.45
Reference voltage, CTL pin current vs. Control voltage
5.0 Ta = +25°C 500.0
VB = 5 V
VREF
4.0 400.0
3.0 300.0
ICTL
2.0 200.0
3.40
–40.0 –20.0 0.0 20.0 40.0 60.0 80.0 100.0
Temperature Ta (°C)
1.0
0
0
5.0 10.0 15.0 20.0
Control voltage VCTL (V)
100.0
0
25.0
ERR threshold (3.5 V setting) vs.
Temperature characteristics
3.60
VCC = 5 V, VB = 5 V, RT = 130 kΩ
3.55
3.50
3.45
3.40
–40.0 –20.0 0.0 20.0 40.0 60.0 80.0 100.0
Temperature Ta (°C)
ERR threshold (2.0 V setting) vs.
Temperature characteristics
2.04
2.02
VCC = 5 V, VB = 5 V, RT = 130 kΩ
2.00
1.98
196
1.94
–40.0 –20.0 0.0 20.0 40.0 60.0 80.0 100.0
Temperature Ta (°C)
(Continued)
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MB3870.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MB3870 | Pentium II DC/DC Converter IC | Fujitsu Media Devices |
| MB3871 | Mobile Pentium II DC/DC Converter IC | Fujitsu Media Devices |
| MB3873 | Multi-Resonance AC/DC Converter IC | Fujitsu Media Devices |
| MB3874 | DC/DC Converter IC for Parallel Charging | Fujitsu Media Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |