|
|
PDF MCP1258 Data sheet ( Hoja de datos )
| Número de pieza | MCP1258 | |
| Descripción | Low-Ripple Charge Pump | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MCP1258 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
MCP1256/7/8/9
Regulated 3.3V, Low-Ripple Charge Pump with Low-
Operating Current SLEEP Mode or BYPASS Mode
Features
• Inductorless 1.5x, 2x Boost DC/DC Converter
• Output Voltage: 3.3V
• High Output Voltage Accuracy:
- ±3.0% (VOUT Fixed)
www.DataShe•etO4Uut.cpuotmCurrent Up To 100 mA
• 20 mVPP Output Voltage Ripple
• Thermal Shutdown and Short Circuit Protection
• Uses Small Ceramic Capacitors
• Switching Frequency: 650 kHz
• Low-Power SLEEP Mode: MCP1256/7
• BYPASS Mode: MCP1258/9
• Low-Power Shutdown Mode: 0.1 μA (Typical)
• Shutdown Input Compatible with 1.8V Logic
• VIN Range: 1.8V to 3.6V
• Soft-Start Circuitry to Minimize Inrush Current
• Temperature Range: -40°C to +125°C
• Packaging:
- 10-Pin, 3 mm x 3 mm DFN
- 10-Pin, MSOP
Applications
• Pagers
• Portable Measurement Instruments
• Home Automation Products
• PICmicro® MCU Bias
Typical Application
INPUT
1.8V to 3.6V
CIN
10 μF
C1
1 μF
ON / OFF
MCP1256
7 VIN VOUT 5
10 SHDN
PGOOD
1
4 C1+
8 C1-
C2+ 6
C2- 3
2 SLEEP
GND
9
R1
C2
1 μF
OUTPUT
3.3V
COUT
10 μF
Power-Good
Indication
Typical Application with Power-Good Indication
Description
The MCP1256, MCP1257, MCP1258 and MCP1259
are inductorless, positive regulated charge pump
DC/DC converters. The devices generate a regulated
3.3V output voltage from a 1.8V to 3.6V input. The
devices are specifically designed for applications
operating from 2-cell alkaline, Ni-Cd, or Ni-MH
batteries or by one primary lithium MnO2 (or similar)
coin cell battery.
The MCP1256, MCP1257, MCP1258 and MCP1259
provide high efficiency by automatically switching
between 1.5x and 2x boost operation. In addition, at
light output loads, the MCP1256 and MCP1257 can be
placed in a SLEEP mode, lowering the quiescent
current while maintaining the regulated output voltage.
Alternatively, the MCP1258 and MCP1259 provide a
BYPASS feature connecting the input voltage to the
output. This allows for real-time clocks,
microcontrollers or other system devices to remain
biased with virtually no current being consumed by the
MCP1258 or MPC1259.
In normal operation, the output voltage ripple is below
20 mVPP at load currents up to 100 mA. Normal opera-
tion occurs at a fixed switching frequency of 650 kHz,
avoiding interference with sensitive IF bands.
The MCP1256 and MCP1258 feature a power-good
output that can be used to detect out-of-regulation
conditions. The MCP1257 and MCP1259 feature a low-
battery indication that issues a warning if the input
voltage drops below a preset voltage threshold.
Extremely low supply current and few external parts (4
capacitors) make these devices ideal for small, battery-
powered applications. A Shutdown mode is also
provided for further power reduction.
The devices incorporate thermal and short-circuit pro-
tection. Two package offerings are provided: 10-pin
MSOP and 10-lead 3 mm x 3 mm DFN. The devices
are completely characterized over the junction temper-
ature range of -40°C to +125°C.
© 2006 Microchip Technology Inc.
DS21989A-page 1
1 page  
MCP1256/7/8/9
AC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all limits apply for VIN = 1.8V to 3.6V, SHDN = VIN, CIN = COUT = 10 μF,
C1 = C2 = 1 μF, IOUT = 10 mA, TJ = -40°C to +125°C. Typical values are at TJ = +25°C.
Parameters
Sym
Min Typ Max Units
Conditions
ALL DEVICES
Internal Oscillator Frequency
Output Voltage Ripple,
Normal Operation
VOUT Wake-up Time From
Shutdown
www.DataSheMetC4PU1.c2o5m6 and MCP1257
Output Voltage Ripple,
SLEEP Mode
MCP1258 and MCP1259
VOUT Wake-up Time From
BYPASS
FOSC
VRIP
TWKUP
VRIP
TWKUP
— 650 —
kHz
— 5 — mVp-p COUT = 10 μF, IOUT = 10 mA
— 20 — mVp-p COUT = 10 μF, IOUT = 100 mA
— 12 — mVp-p COUT = 2.2 μF, IOUT = 10 mA
— 55 — mVp-p COUT = 2.2 μF, IOUT = 100 mA
— 175 —
μs VIN = 3.0V, IOUT = 10 mA,
SHDN = VIH(MIN),
VOUT from 0 to 90% Nominal Regulated
Output Voltage
— 40 — mVp-p COUT = 10 μF, IOUT = 0.1 mA
— 60 — mVp-p COUT = 10 μF, IOUT = 4 mA
— 40 — mVp-p COUT = 2.2 μF, IOUT = 0.1 mA
— 60 — mVp-p COUT = 2.2 μF, IOUT = 4 mA
— 150 —
μs VIN = 3.0V, IOUT = 10 mA,
SHDN = VIH(MIN),
VOUT from 0 to 90% Nominal Regulated
Output Voltage
TEMPERATURE SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, all limits apply for VIN = 1.8V to 3.6V, SHDN = VIN, CIN = COUT = 10 μF,
C1 = C2 = 1 μF, IOUT = 10 mA, TJ = -40°C to +125°C. Typical values are at TJ = +25°C.
Parameters
Sym
Min Typ Max
Units
Conditions
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 10-Lead, MSOP
Thermal Resistance, 10-Lead, DFN
3 mm x 3 mm
TJ -40 — +125 °C
TJ -40 — +125 °C
TA -65 — +150 °C
θJA — 200 — °C/W 4-Layer JC51-7 Standard Board,
Natural Convection
θJA — 57 — °C/W 4-Layer JC51-7 Standard Board,
Natural Convection
© 2006 Microchip Technology Inc.
DS21989A-page 5
5 Page 
MCP1256/7/8/9
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Pin No.
DFN MSOP
11
22
3
4
5
www.DataSheet4U6.com
7
8
9
10
3
4
5
6
7
8
9
10
Symbol
PGOOD
LBO
SLEEP
BYPASS
C2-
C1+
VOUT
C2+
VIN
C1-
GND
SHDN
Function
Power-Good Indication Open-Drain Output Pin: MCP1256 and MCP1258
Low-Battery Indication Open-Drain Output Pin: MCP1257 and MCP1259
Active Low SLEEP Mode Input Pin: MCP1256 and MCP1257
Active Low BYPASS Mode Input Pin: MCP1258 and MCP1259
Flying Capacitor Negative Pin
Flying Capacitor Positive Pin
Regulated 3.3V Output Voltage
Flying Capacitor Positive Pin
Power Supply Input Voltage
Flying Capacitor Negative Pin
0V Reference
Active Low SHUTDOWN Mode Input Pin
3.1 Status Indication (PGOOD, LBO)
3.1.1
POWER-GOOD OUTPUT PIN
(PGOOD)
MCP1256/8: PGOOD is high impedance when the out-
put voltage is in regulation. A logic low is asserted
when the output falls 7% (typical) below the nominal
value. The PGOOD output remains low until VOUT is
within 3% (typical) of its nominal value. On start-up, this
pin indicates when the output voltage reaches its final
value. PGOOD is high impedance when SHDN is low
or when BYPASS is low (MCP1258).
3.1.2 LOW-BATTERY OUTPUT PIN (LBO)
MCP1257/9: LBO is high impedance when the input
voltage is above the low-battery threshold voltage. A
logic low is asserted when the input falls below the low-
battery threshold voltage. The LBO output remains low
until VIN is above the low-battery threshold voltage plus
the low-battery hysteresis voltage. LBO is high
impedance when SHDN is low or when BYPASS is low
(MCP1259).
3.2 Mode Selection (SLEEP, BYPASS)
3.2.1
ACTIVE LOW SLEEP MODE
(SLEEP)
MCP1256/7: A logic low signal applied to this pin
places the device into a SLEEP mode of operation. In
this mode, the device maintains regulation. SLEEP
mode performs pulse skip operation reducing the
current draw of the device at the expense of increased
output voltage ripple.
3.2.2
ACTIVE LOW BYPASS MODE
(BYPASS)
MCP1258/9: A logic low signal applied to this pin
places the device into a BYPASS mode of operation. In
this mode, the input supply voltage is connected
directly to the output.
3.3 Flying Capacitor Negative (C2-)
A 1 μF ceramic flying capacitor is recommended.
3.4 Flying Capacitor Positive (C1+)
A 1 μF ceramic flying capacitor is recommended.
3.5 Regulated Output Voltage (VOUT)
Regulated 3.3V output. Bypass to GND with a
minimum of 2.2 μF.
3.6 Flying Capacitor Positive (C2+)
A 1 μF ceramic flying capacitor is recommended.
3.7 Power Supply Input Voltage (VIN)
A supply voltage of 1.8V to 3.6V is recommended.
Bypass to GND with a minimum of 1 μF.
3.8 Flying Capacitor Negative (C1-)
A 1 μF ceramic flying capacitor is recommended.
3.9 0V Reference (GND)
Connect to negative terminal of and input supply.
3.10 Device Shut Down (SHDN)
A logic low signal applied to this pin disables the
device. A logic high signal applied to this pin allows
normal operation.
© 2006 Microchip Technology Inc.
DS21989A-page 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MCP1258.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MCP1252 | (MCP1252 / MCP1253) Low Noise / Positive-Regulated Charge Pump | Microchip Technology |
| MCP1253 | (MCP1252 / MCP1253) Low Noise / Positive-Regulated Charge Pump | Microchip Technology |
| MCP1256 | Low-Ripple Charge Pump | Microchip Technology |
| MCP1257 | Low-Ripple Charge Pump | Microchip Technology |
| 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 |