Instrukcja obsługi Microchip MCP1603


Przeczytaj poniżej 📖 instrukcję obsługi w języku polskim dla Microchip MCP1603 (34 stron) w kategorii nieskategoryzowany. Ta instrukcja była pomocna dla 8 osób i została oceniona przez 2 użytkowników na średnio 4.5 gwiazdek

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2007-2012 Microchip Technology Inc. DS22042B-page 1
MCP1603/B/L
Features
Over 90% Typical Efficiency
Output Current Up To 500 mA
Low PFM Quiescent Current = 45 µA, typical
(MCP1603/L)
Low Shutdown Current = 0.1 µA, typical
Adjustable Output Voltage:
- 0.8V to 4.5V
Fixed Output Voltage:
- 1.2V, 1.5V, 1.8V, 2.5V, 3.3V (MCP1603/L)
- 1.8V, 3.3V (MCP1603B)
2.0 MHz Fixed-Frequency PWM (Heavy Load)
Automatic PWM-to-PFM Mode Transition
(MCP1603/L)
PWM Mode Only Option (MCP1603B)
100% Duty Cycle Operation
Internally Compensated
Undervoltage Lockout (UVLO)
Overtemperature Protection
Space Saving Packages:
- 5-Lead TSOT, Two Pinout Types (MCP1603/L)
- 8-Lead 2 x 3 DFN
Applications
Cellular Telephones
Portable Computers
Organizers / PDAs
USB Powered Devices
Digital Cameras
Portable Equipment
+5V or +3.3V Distributed Systems
• Headsets
General Description
The MCP1603/B/L is a high-efficiency, fully-integrated
500 mA synchronous buck regulator whose 2.7V to
5.5V input voltage range makes it ideally suited for
applications powered from 1-cell Li-Ion or 2-cell/3-cell
NiMH/NiCd batteries.
At heavy loads, the MCP1603/B/L operates in the
2.0 MHz fixed frequency pulse-width modulation
(PWM) mode, which provides a low noise, low-output
ripple, small-size solution. When the load is reduced to
light levels, the MCP1603/L automatically changes
operation to a Pulse Frequency Modulation (PFM)
mode to minimize quiescent current draw from the
battery. No intervention is necessary for a smooth
transition from one mode to another. These two modes
of operation allow the MCP1603/L to achieve the
highest efficiency over the entire operating current
range.
The MCP1603B device disables the PFM mode
switching, and operates only in normal PWM mode
over the entire load range (without skipping).
MCP1603B is for applications that cannot tolerate the
low-frequency output ripple associated with PFM
switching.
The MCP1603/B/L family is available with either an
adjustable or fixed-output voltage. The available fixed
output voltage options for MCP1603/L are 1.2V, 1.5V,
1.8V, 2.5V and 3.3V, and for MCP1603B are 1.8 and
3.3V. When a fixed option is used, only three additional
small external components are needed to form a
complete solution. Couple this with the low profile,
small-foot print packages and the entire system
solution is achieved with minimal size.
Additional protection features include: UVLO,
overtemperature and overcurrent protection.
2.0 MHz, 500 mA Synchronous Buck Regulator
MCP1603/B/L
DS22042B-page 2 2007-2012 Microchip Technology Inc.
Package Types
Typical Application Circuit
1
2
3 4
5LX
VFB /VOUT
SHDN
GND
VIN 1
2
3 4
5
LX
VFB/VOUT
SHDN
GND
VIN
MCP1603/MCP1603B
TSOT
MCP1603L
TSOT
MCP1603
2 x 3 DFN*
SHDN
NC
VFB/VOUT
VIN
NC
1
2
3
4
8
7
6
5NC
GNDLX
* Includes Exposed Thermal Pad (EP); see Table 3-1.
EP
9
VIN
SHDN
GND
VFB
LX
VIN
2.7V to 4.5V
VOUT
1.8V @ 500 mA
COUT
4.7 µF
CIN
4.7 µF
L1
4.7 µH
30
40
50
60
70
80
90
100
Efficiency (%)
VOUT = 1.8V VIN = 2.7V
VIN = 3.6V VIN = 4.5V
10
20
30
0.1 1 10 100 1000
Output Current (mA)
__ PFM/PWM (MCP1603/L)
--- PWM (MCP1603B)
2007-2012 Microchip Technology Inc. DS22042B-page 3
MCP1603/B/L
Functional Block Diagram
ILIMPWM
ILIMPFM
IPEAKPWM
IPEAKPFM
VIN
SHDN
VFB / VOUT
GND
LX
Band
Gap
UVLO
Switch Drive
UVLO
VREF
Logic and Timing
S
R Q
Q
Soft Start
VREF
PWM/PFM
Logic
VREF
Slope
Comp.
OSC
-IPK
Limit
UVLO
Thermal
Shutdown
TSD
EA
POFF NOFF
PWM/PFM - PWM ONLY
TSD
PFM Error Amp
PWM Error Amp
OV Threshold
UV Threshold
IPK Limit
-ILPK
IPEAKPWM
IPEAKPFM
Disable
Switcher
-ILPK
PWM-ONLY
+
+


Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: MCP1603

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