|
|
PDF MCP1640C Data sheet ( Hoja de datos )
| Número de pieza | MCP1640C | |
| Descripción | 0.65V Start-up Synchronous Boost Regulator | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MCP1640C (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
MCP1640/B/C/D
0.65V Start-Up Synchronous Boost Regulator
with True Output Disconnect or Input/Output Bypass Option
Features
• Up to 96% Typical Efficiency
• 800 mA Typical Peak Input Current Limit:
- IOUT > 100 mA @ 1.2V VIN, 3.3V VOUT
- IOUT > 350 mA @ 2.4V VIN, 3.3V VOUT
- IOUT > 350 mA @ 3.3V VIN, 5.0V VOUT
• Low Start-Up Voltage: 0.65V, typical 3.3V VOUT
@ 1 mA
• Low Operating Input Voltage: 0.35V, typical
3.3VOUT @ 1 mA
• Adjustable Output Voltage Range: 2.0V to 5.5V
• Maximum Input Voltage VOUT < 5.5V
• Automatic PFM/PWM Operation (MCP1640/C):
- PFM Operation Disabled (MCP1640B/D)
- PWM Operation: 500 kHz
• Low Device Quiescent Current: 19 µA, typical
PFM Mode (not switching)
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft Start
• Selectable, Logic Controlled Shutdown States:
- True Load Disconnect Option (MCP1640/B)
- Input to Output Bypass Option (MCP1640C/D)
• Shutdown Current (All States): < 1 µA
• Low Noise, Anti-Ringing Control
• Overtemperature Protection
• Available Packages:
- 6-Lead SOT-23
- 8-Lead 2 x 3 mm DFN
Applications
• One, Two and Three Cell Alkaline and NiMH/NiCd
Portable Products
• Single-Cell Li-Ion to 5V Converters
• Li Coin Cell Powered Devices
• Personal Medical Products
• Wireless Sensors
• Handheld Instruments
• GPS Receivers
• Bluetooth Headsets
• +3.3V to +5.0V Distributed Power Supply
General Description
The MCP1640/B/C/D is a compact, high-efficiency,
fixed frequency, synchronous step-up DC-DC con-
verter. It provides an easy-to-use power supply solution
for applications powered by either single-cell, two-cell,
or three-cell alkaline, NiCd, NiMH, and single-cell Li-Ion
or Li-Polymer batteries.
Low-voltage technology allows the regulator to start-up
without high inrush current or output voltage overshoot
from a low 0.65V input. High efficiency is accomplished
by integrating the low resistance N-Channel Boost
switch and synchronous P-Channel switch. All
compensation and protection circuitry is integrated to
minimize the number of external components. For
standby applications, the MCP1640 consumes only
19 µA while operating at no load, and provides a true
disconnect from input to output while in Shutdown
(EN = GND). Additional device options are available by
operating in PWM-Only mode and connecting input to
output while the device is in Shutdown.
The “true” load disconnect mode provides input-to-out-
put isolation while the device is disabled by removing
the normal boost regulator diode path from input-to-
output. The Input-to-Output Bypass mode option con-
nects the input to the output using the integrated low
resistance P-Channel MOSFET, which provides a low
bias voltage for circuits operating in Deep Sleep mode.
Both options consume less than 1 µA of input current.
Output voltage is set by a small external resistor
divider. Two package options are available, 6-Lead
SOT-23 and 8-Lead 2 x 3 mm DFN.
Package Types
MCP1640
6-Lead SOT-23
MCP1640
8-Lead 2 x 3 DFN*
SW 1
GND 2
EN 3
6 VIN
VFB 1
8 VIN
5 VOUT SGND 2 EP 7 VOUTS
4 VFB
PGND 3
EN 4
9
6 VOUTP
5 SW
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2010-2015 Microchip Technology Inc.
DS20002234D-page 1
1 page  
MCP1640/B/C/D
2.0 TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise indicated, VIN = EN = 1.2V, COUT = CIN = 10 µF, L = 4.7 µH, VOUT = 3.3V, ILOAD = 15 mA, TA = +25°C.
27.5
25.0
VIN = 1.2V
VOUT = 5.0V
22.5
20.0
17.5
VOUT = 3.3V
15.0
12.5
VOUT = 2.0V
10.0
-40 -25 -10 5 20 35 50 65 80
Ambient Temperature (°C)
FIGURE 2-1:
VOUT IQ vs. Ambient
Temperature in PFM Mode.
100
90 VOUT = 2.0V
80
70
60
50
40
30
20
10
0
0.01
0.1
VIN = 1.6V
VIN = 0.8V
VIN = 1.2V
1 10
IOUT (mA)
PWM / PFM
PWM Only
100 1000
FIGURE 2-4:
2.0V VOUT PFM/PWM Mode
Efficiency vs. IOUT.
300
VIN = 1.2V
275
VOUT = 5.0V
250
225
200
VOUT = 3.3V
175
150
-40 -25 -10 5 20 35 50 65
Ambient Temperature (°C)
80
FIGURE 2-2:
VOUT IQ vs. Ambient
Temperature in PWM Mode.
100
90 VOUT = 3.3V
80
70
60
50
40
30
20
10
0
0.01
0.1
VIN = 2.5V
VIN = 0.8V
VIN = 1.2V
1 10
IOUT (mA)
PWM / PFM
PWM Only
100 1000
FIGURE 2-5:
3.3V VOUT PFM/PWM Mode
Efficiency vs. IOUT.
600
500
400
300
VOUT = 3.3V
VOUT = 5.0V
VOUT = 2.0V
200
100
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
VIN (V)
FIGURE 2-3:
Maximum IOUT vs. VIN After
Start-Up, VOUT 10% Below Regulation Point.
100
90
VOUT = 5.0V
80
70
60
50
40
30
20
10
0
0.01
0.1
FIGURE 2-6:
Efficiency vs. IOUT.
VIN = 3.6V
VIN = 1.2V VIN = 1.8V
PWM / PFM
PWM Only
1 10
IOUT (mA)
100 1000
5.0V VOUT PFM/PWM Mode
2010-2015 Microchip Technology Inc.
DS20002234D-page 5
5 Page 
4.0 DETAILED DESCRIPTION
4.1 Device Option Overview
The MCP1640/B/C/D family of devices is capable of
low start-up voltage and delivers high efficiency over a
wide load range for single-cell, two-cell, or three-cell
alkaline, NiCd, NiMH and single-cell Li-Ion battery
inputs. A high level of integration lowers total system
cost, eases implementation and reduces board area.
The devices feature low start-up voltage, adjustable
output voltage, PWM/PFM mode operation, low IQ,
integrated synchronous switch, internal compensation,
low noise anti-ring control, inrush current limit, and soft
start.
There are two options for the MCP1640/B/C/D family:
• PWM/PFM mode or PWM-Only mode
• “True Output Disconnect” mode or Input-to-Output
Bypass mode
4.1.1 PWM/PFM MODE OPTION
The MCP1640/C devices use an automatic switchover
from PWM to PFM mode for light load conditions to
maximize efficiency over a wide range of output
current. During PFM mode, higher peak current is used
to pump the output up to the threshold limit. While
operating in PFM or PWM mode, the P-Channel switch
is used as a synchronous rectifier, turning off when the
inductor current reaches 0 mA to maximize efficiency.
In PFM mode, a comparator is used to terminate
switching when the output voltage reaches the upper
threshold limit. Once switching has terminated, the
output voltage will decay or coast down. During this
period, very low IQ is consumed from the device and
input source, which keeps power efficiency high at light
load.
The disadvantages of PWM/PFM mode are higher out-
put ripple voltage and variable PFM mode frequency.
The PFM mode frequency is a function of input voltage,
output voltage and load. While in PFM mode, the boost
converter pumps the output up at a switching frequency
of 500 kHz.
4.1.2 PWM-ONLY MODE OPTION
The MCP1640B/D devices disable PFM mode
switching, and operate only in PWM mode over the
entire load range. During periods of light load opera-
tion, the MCP1640B/D continues to operate at a con-
stant 500 kHz switching frequency, keeping the output
ripple voltage lower than PFM mode.
During PWM-Only mode, the MCP1640B/D P-Channel
switch acts as a synchronous rectifier by turning off (to
prevent reverse current flow from the output cap back
to the input) in order to keep efficiency high.
MCP1640/B/C/D
For noise immunity, the N-Channel MOSFET current
sense is blanked for approximately 100 ns. With a typ-
ical minimum duty cycle of 100 ns, the MCP1640B/D
continues to switch at a constant frequency under light
load conditions. Figure 2-12 represents the input volt-
age versus load current for the pulse skipping threshold
in PWM-Only mode. At lighter loads, the MCP1640B/D
devices begin to skip pulses.
4.1.3
TRUE OUTPUT DISCONNECT
MODE OPTION
The MCP1640/B devices incorporate a true output
disconnect feature. With the EN pin pulled low, the
output of the MCP1640/B is isolated or disconnected
from the input by turning off the integrated P-Channel
switch and removing the switch bulk diode connection.
This removes the DC path that is typical in boost con-
verters, which allows the output to be disconnected
from the input. During this mode, less than 1 µA of cur-
rent is consumed from the input (battery). True output
disconnect does not discharge the output; the output
voltage is held up by the external COUT capacitance.
4.1.4 INPUT BYPASS MODE OPTION
The MCP1640C/D devices incorporate the Input
Bypass shutdown option. With the EN input pulled low,
the output is connected to the input using the internal
P-Channel MOSFET. In this mode, the current draw
from the input (battery) is less than 1 µA with no load.
Input Bypass mode is used when the input voltage
range is high enough for the load to operate in Sleep or
Low IQ mode. When a higher regulated output voltage
is necessary to operate the application, the EN input is
pulled high, enabling the boost converter.
TABLE 4-1: PART NUMBER SELECTION
Part
Number
PWM/ PWM
True
PFM -Only Disconnect
Input
-to-
Output
Bypass
MCP1640
MCP1640B
MCP1640C
MCP1640D
X
X
X
X
X
X
X
X
2010-2015 Microchip Technology Inc.
DS20002234D-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MCP1640C.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MCP1640 | 0.65V Start-up Synchronous Boost Regulator | Microchip Technology |
| MCP1640B | 0.65V Start-up Synchronous Boost Regulator | Microchip Technology |
| MCP1640C | 0.65V Start-up Synchronous Boost Regulator | Microchip Technology |
| MCP1640D | 0.65V Start-up Synchronous Boost Regulator | 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 |