Instrukcja obsługi Microchip MCP1802
Microchip
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MCP1802
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2010 Microchip Technology Inc. DS22053C-page 1
MCP1802
Features:
• 300 mA Maximum Output Current
• Low Dropout Voltage, 200 mV typical @ 100 mA
• 25 µA Typical Quiescent Current
• 0.01 µA Typical Shutdown Current
• Input Operating Voltage Range: 2.0V to10.0V
• Standard Output Voltage Options:
- (0.9V, 1.8V, 2.5V, 3.0V, 3.3V, 5.0V, 6.0V)
• Output voltage accuracy:
- ±2% (VR > 1.5V), ±30 mV (VR 1.5V)
• Stable with Ceramic output capacitors
• Current Limit Protection
• Shutdown pin
• High PSRR: 70 dB typical @ 10 kHz
Applications:
• Battery-powered Devices
• Battery-powered Alarm Circuits
• Smoke Detectors
• CO2 Detectors
• Pagers and Cellular Phones
• Wireless Communications Equipment
• Smart Battery Packs
• Low Quiescent Current Voltage Reference
• PDAs
• Digital Cameras
• Microcontroller Power
• Solar-Powered Instruments
• Consumer Products
• Battery Powered Data Loggers
Related Literature:
• AN765, “Using Microchip’s Micropower LDOs”,
DS00765, Microchip Technology Inc., 2002
• AN766, “Pin-Compatible CMOS Upgrades to
BiPolar LDOs”, DS00766,
Microchip Technology Inc., 2002
• AN792, “A Method to Determine How Much
Power a SOT23 Can Dissipate in an Application”,
DS00792, Microchip Technology Inc., 2001
Description:
The MCP1802 is a family of CMOS low dropout (LDO)
voltage regulators that can deliver up to 300 mA of
current while consuming only 25 µA of quiescent
current (typical). The input operating range is specified
from 2.0V to 10.0V, making it an ideal choice for two to
six primary cell battery-powered applications, 9V
alkaline and one or two cell Li-Ion-powered
applications.
The MCP1802 is capable of delivering 100 mA with
only 200 mV (typical) of input to output voltage
differential (VOUT = 3.0V). The output voltage tolerance
of the MCP1802 at +25°C is typically ±0.4% with a
maximum of ±2%. Line regulation is ±0.01% typical at
+25°C.
The LDO output is stable with a minimum of 1 µF of
output capacitance. Ceramic, tantalum or aluminum
electrolytic capacitors can all be used for input and
output. Overcurrent limit with current foldback provides
short-circuit protection. A shutdown (SHDN) function
allows the output to be enabled or disabled. When
disabled, the MCP1802 draws only 0.01 µA of current
(typical).
The MCP1802 is available in a SOT-23-5 package.
Package Types
SOT-23-5
1 2 3
5 4
VOUT NC
VIN SHDNVSS
300 mA, High PSRR, Low Quiescent Current LDO
MCP1802
DS22053C-page 2 2010 Microchip Technology Inc.
Functional Block Diagram
Typical Application Circuit
+
-
MCP1802
VIN VOUT
GND
+VIN
Error Amplifier
Voltage
Reference Current Limiter
Shutdown
Control
SHDN
+VIN
MCP1802
VIN
CIN
1 µF
COUT
1 µF Ceramic
VIN
9V
Battery
+
VOUT
NC
GND
SHDN
Ceramic
VOUT
3.3V @ 40 mA
1
2
3
5
4
SOT-23-5 mA
2010 Microchip Technology Inc. DS22053C-page 3
MCP1802
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
Input Voltage ................................................................. +12V
Output Current (Continuous) ..................... PD/(VIN-VOUT)mA
Output Current (Peak) ............................................... 500 mA
Output Voltage ............................... (V
SS-0.3V) to (VIN+0.3V)
SHDN Voltage..................................(V
SS-0.3V) to (VIN+0.3V)
Continuous Power Dissipation:
5-Pin SOT-23-5 .................................................... 250 mW
† Notice: Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at those or any other conditions above those
indicated in the operational listings of this specification
is not implied. Exposure to maximum rating conditions
for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all limits are established for V IN = VR + 1.0V, Note 1, COUT = 1 µF (X7R),
CIN = 1 µF (X7R), VSHDN = VIN, T
A = +25°C
Parameters Sym Min Typ Max Units Conditions
Input / Output Characteristics
Input Operating Voltage VIN 2.0 — 10.0 V Note 1
Input Quiescent Current Iq— 25 50 µA IL = 0 mA
Shutdown Current ISHDN — 0.01 0.10 µA SHDN = 0V
Maximum Output Current IOUT_mA 300
300
260
260
—
—
—
—
—
—
—
—
mA V R 2V, VIN = VR +1.0V
1.5V VR 2.0V, V
IN =3.0V
1.0V VR 1.5V, V
IN = VR +1.5V
0.9V VR 1.0V, V
IN =2.5V
Current Limiter ILIMIT — 380 — mA if VR 1.75V, then VIN = VR + 2.0V
Output Short Circuit Current IOUT_SC — 50 — mA if VR 1.75V, then VIN = VR + 2.0V
Output Voltage Regulation VOUT VR-2.0% VRVR+2.0% V VR 1.45V, IOUT = 30 mA, Note 2
VR-30 mV VRVR+30 mV VR 1.45V, IOUT = 30 mA
VOUT Temperature
Coefficient
TCVOUT — 100 — ppm/°C IOUT = 30 mA, -40°C TA +85°C,
Note 3
Line Regulation VOUT/
(VOUTX VIN)
-0.2 ±0.01 +0.2 %/V (VR + 1V) VIN 10V, Note 1
VR 1.75V, IOUT = 30 mA
VR 1.75V, IOUT = 10 mA
Load Regulation VOUT/V OUT —
—
15
—
50
100
mV IL = 1.0 mA to 100 mA, Note 4
IL = 1.0 mA to 300 mA,
Dropout Voltage, Note 5 VDROPOUT — 60 90 mV IL = 30 mA, 3.1V VR 6.0V
— 200 250 IL = 100 mA, 3.1V VR 6.0V
— 80 120 IL = 30 mA, 2.0V VR 3.1V
— 240 350 IL = 100 mA, 2.0V VR < 3.1V
— 2.07 - VR2.10 - VRV IL = 30 mA,VR 2.0V
— 2.23 - VR2.33 - VRIL = 100 mA, VR < 2.0V
Power Supply Ripple
Rejection Ratio
PSRR — 70 — dB f = 10 kHz, IL = 50 mA, VINAC = 1V
pk-pk, CIN
= 0 µF,
if VR 1.5V, then VIN = 2.5V
Output Noise eN— 0.46 — μ √V/ Hz IOUT = 100 mA, f = 1 kHz, COUT =
1μF (X7R Ceramic), VOUT
= 2.5V
Note 1: The minimum VIN must meet two conditions: VIN2.0V and VIN (VR + 1.0V).
2: VR is the nominal regulator output voltage. For example: VR = 1.8V, 2.5V, 3.0V, 3.3V, or 5.0V.
The input voltage VIN = V R + 1.0V or ViIN = 2.0V (whichever is greater); IOUT = 100 µA.
3: TCVOUT = (VOUT-HIGH - VOUT-LOW
) *10 6
/ (V R * Temperature), VOUT-HIGH
= highest voltage measured over the
temperature range. VOUT-LOW = lowest voltage measured over the temperature range.
4: Load regulation is measured at a constant junction temperature using low duty cycle pulse testing. Changes in output
voltage due to heating effects are determined using thermal regulation specification TCV OUT
.
5: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its measured
value with an applied input voltage of VR + 1.0V or 2.0V, whichever is greater.
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | nieskategoryzowany |
| Model: | MCP1802 |
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