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PDF MCP1725 Data sheet ( Hoja de datos )
| Número de pieza | MCP1725 | |
| Descripción | Low Quiescent Current LDO Regulator | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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MCP1725
500 mA, Low Voltage, Low Quiescent Current LDO Regulator
Features
• 500 mA Output Current Capability
• Input Operating Voltage Range: 2.3V to 6.0V
• Adjustable Output Voltage Range: 0.8V to 5.0V
• Standard Fixed Output Voltages:
- 0.8V, 1.2V, 1.8V, 2.5V, 3.0V, 3.3V, 5.0V
www.DataShe•etOU4pUtho.ecnroRmFiexqeudeOstutput Voltage Options Available
• Low Dropout Voltage: 210 mV Typical at 500 mA
• Typical Output Voltage Tolerance: 0.5%
• Stable with 1.0 µF Ceramic Output Capacitor
• Fast response to Load Transients
• Low Supply Current: 120 µA (typ)
• Low Shutdown Supply Current: 0.1 µA (typ)
• Adjustable Delay on Power Good Output
• Short Circuit Current Limiting and
Overtemperature Protection
• 2x3 DFN-8 and SOIC-8 Package Options
Applications
• High-Speed Driver Chipset Power
• Networking Backplane Cards
• Notebook Computers
• Network Interface Cards
• Palmtop Computers
• Video Graphics Adapters
• 2.5V to 1.XV Regulators
Description
The MCP1725 is a 500 mA Low Dropout (LDO) linear
regulator that provides high current and low output
voltages in a very small package. The MCP1725
comes in a fixed (or adjustable) output voltage version,
with an output voltage range of 0.8V to 5.0V. The
500 mA output current capability, combined with the
low output voltage capability, make the MCP1725 a
good choice for new sub-1.8V output voltage LDO
applications that have high current demands.
The MCP1725 is stable using ceramic output
capacitors that inherently provide lower output noise
and reduce the size and cost of the entire regulator
solution. Only 1 µF of output capacitance is needed to
stabilize the LDO.
Using CMOS construction, the quiescent current
consumed by the MCP1725 is typically less than
120 µA over the entire input voltage range, making it
attractive for portable computing applications that
demand high output current. When shut down, the
quiescent current is reduced to less than 0.1 µA.
The scaled-down output voltage is internally monitored
and a power good (PWRGD) output is provided when
the output is within 92% of regulation (typical). An
external capacitor can be used on the CDELAY pin to
adjust the delay from 200 µs to 300 ms.
The overtemperature and short circuit current-limiting
provide additional protection for the LDO during system
fault conditions.
Package Types
Adjustable (SOIC-8)
Fixed (SOIC-8)
Adjustable (2x3 DFN)
Fixed (2x3 DFN)
VIN 1
VIN 2
SHDN 3
GND 4
8 VOUT
7 ADJ
6 CDELAY
5 PWRGD
VIN 1
VIN 2
SHDN 3
GND 4
8 VOUT
7 Sense
6 CDELAY
5 PWRGD
VIN
VIN
SHDN
GND
1
2
3
4
8 VOUT
VIN 1
7 ADJ
VIN 2
6 CDELAY SHDN 3
5 PWRGD GND 4
8 VOUT
7 Sense
6 CDELAY
5 PWRGD
Note: DFN tab is at ground potential.
© 2006 Microchip Technology Inc.
DS22026A-page 1
1 page  
MCP1725
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VIN .................................................................................... 6.5V
Maximum Voltage on Any Pin ... (GND – 0.3V) to (VIN + 0.3)V
Maximum Power Dissipation......... Internally-Limited (Note 6)
Output Short Circuit Duration ................................ Continuous
Storage temperature .....................................-65°C to +150°C
Maximum Junction Temperature, TJ ........................... +150°C
ESD protection on all pins (HBM/MM).............. ≥ 2 kV; ≥ 200V
† 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.
AC/DC CHARACTERISTICS
www.DataSheEelte4cUt.rcicoaml Specifications: Unless otherwise noted, VIN = VOUT(MAX) + VDROPOUT(MAX) (Note 1), VR = 1.8V for Adjustable Output,
IOUT = 1 mA, CIN = COUT = 4.7 µF (X7R Ceramic), TA = +25°C.
Boldface type applies for junction temperatures, TJ (Note 7) of -40°C to +125°C
Parameters
Sym
Min Typ Max Units
Conditions
Input Operating Voltage
Input Quiescent Current
Input Quiescent Current for
SHDN Mode
VIN
Iq
ISHDN
2.3 6.0 V Note 1
— 120 220 µA IL = 0 mA, VIN = Note 1,
VOUT = 0.8V to 5.0V
— 0.1
3 µA SHDN = GND
Maximum Output Current
Line Regulation
Load Regulation
IOUT
ΔVOUT/
(VOUT x ΔVIN)
ΔVOUT/VOUT
500
—
-1.0
—
±0.05
±0.5
—
±0.16
1.0
mA VIN = 2.3V to 6.0V
VR = 0.8V to 5.0V, Note 1
%/V (Note 1) ≤ VIN ≤ 6V
% IOUT = 1 mA to 500 mA,
(Note 4)
Output Short Circuit Current
IOUT_SC
— 1.2 — A RLOAD < 0.1Ω, Peak Current
Adjust Pin Characteristics (Adjustable Output Only)
Adjust Pin Reference Voltage
VADJ
0.402
Adjust Pin Leakage Current
IADJ
Adjust Temperature Coefficient
TCVOUT
Fixed-Output Characteristics (Fixed Output Only)
-10
—
0.410
±0.01
40
0.418
+10
—
V
nA
ppm/°C
VIN = 2.3V to VIN = 6.0V,
IOUT = 1 mA
VIN = 6.0V, VADJ = 0V to 6V
Note 3
Voltage Regulation
VOUT
VR - 2.5% VR ±0.5% VR + 2.5% V Note 2
Note 1:
2:
3:
4:
The minimum VIN must meet two conditions: VIN ≥ 2.3V and VIN ≥ VOUT(MAX) + VDROPOUT(MAX).
VR is the nominal regulator output voltage for the fixed cases. VR = 1.2V, 1.8V, etc. VR is the desired set point output
voltage for the adjustable cases. VR = VADJ * ((R1/R2)+1). Figure 4-1.
TCVOUT = (VOUT-HIGH – VOUT-LOW) *106 / (VR * ΔTemperature). VOUT-HIGH is the highest voltage measured over the
temperature range. VOUT-LOW is the lowest voltage measured over the temperature range.
Load regulation is measured at a constant junction temperature using low duty-cycle pulse testing. Load regulation is
tested over a load range from 1 mA to the maximum specified output current.
5: Dropout voltage is defined as the input-to-output voltage differential at which the output voltage drops 2% below its
nominal value that was measured with an input voltage of VOUT = VR + VDROPOUT(MAX).
6: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction
temperature and the thermal resistance from junction to air. (i.e., TA, TJ, θJA). Exceeding the maximum allowable power
dissipation will cause the device operating junction temperature to exceed the maximum +150°C rating. Sustained
junction temperatures above +150°C can impact device reliability.
7: The junction temperature is approximated by soaking the device under test at an ambient temperature equal to the
desired junction temperature. The test time is small enough such that the rise in the junction temperature over the
ambient temperature is not significant.
© 2006 Microchip Technology Inc.
DS22026A-page 5
5 Page 
MCP1725
Note: Unless otherwise indicated, VIN = VOUT + 0.5V or VIN = 2.3V (whichever is greater), IOUT = 1 mA,
CIN = COUT = 4.7 µF Ceramic (X7R), SHDN = VIN, CDELAY = Open, Fixed Output Version, and TA = +25°C.
0.25
0.20
VOUT = 5.0V
0.15
0.10
VOUT = 2.5V
0.05
0.00
0
100 200 300 400
Load Current (mA)
500
www.DataSheFeItG4UU.cRoEm2-19:
Current.
Dropout Voltage vs. Load
10
VIN = 3.3V
VOUT = 2.5V
1
VIN = 2.3V
0.1 VOUT = 0.8V
ILOAD = 200 mA
COUT = 1 μF
CIN = 10 μF
0.01
0.001
0.01
0.1 1 10 100
Frequency (kHz)
1000
FIGURE 2-22:
Output Noise Voltage
Density vs. Frequency.
0.28
0.26
ILOAD = 500 mA
0.24
0.22
VOUT = 5.0V
0.20
0.18
VOUT = 2.5V
0.16
0.14
0.12
0.10
-45 -20 5
30 55 80
Temperature (°C)
105 130
FIGURE 2-20:
Temperature.
Dropout Voltage vs.
0
-10
-20
-30
-40
-50
-60
-70
-80
0.01
VR=1.2V Adj
COUT=4.7 μF ceramic X7R
VIN=2.5V
CIN=0 μF
IOUT=10 mA
0.1 1 10 100
Frequency (kHz)
1000
FIGURE 2-23:
Power Supply Ripple
Rejection (PSRR) vs. Frequency (VOUT = 1.2V
Adj.).
1.20
1.10
1.00
0.90
0.80
0.70
0.60
0.50
3.0
IPEAK
VOUT = 2.5V Fixed
CIN = 3000 µF
ISTEADY STATE
3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
FIGURE 2-21:
Input Voltage.
Short Circuit Current vs.
0
-10
-20
-30
-40
-50
-60
-70
-80
0.01
VR=1.2V Adj
COUT=22 μF ceramic X7R
VIN=2.5V
CIN=0 μF
IOUT=10 mA
0.1 1 10 100
Frequency (kHz)
1000
FIGURE 2-24:
Power Supply Ripple
Rejection (PSRR) vs. Frequency (VOUT = 1.2V
Adj.).
© 2006 Microchip Technology Inc.
DS22026A-page 11
11 Page | ||
| Páginas | Total 32 Páginas | |
| PDF Descargar | [ Datasheet MCP1725.PDF ] | |
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