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MCP1725

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

• Other Fixed Output Voltage Options Available

Upon Request

• 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 (typical)

• Low Shutdown Supply Current: 0.1 µA (typical)

• 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 C

DELAY

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

SHDN

GND

PWRGD

DELAY

Sense

OUT

SHDN

GND

PWRGD

DELAY

ADJ

OUT

Adjustable (SOIC-8) Fixed (SOIC-8)

SHDN

GND

PWRGD

DELAY

Sense

OUT

Fixed (2x3 DFN)

SHDN

GND

PWRGD

DELAY

OUT

Adjustable (2x3 DFN)

ADJ

Note: DFN tab is at ground potential.

500 mA, Low Voltage, Low Quiescent Current LDO Regulator

Summary of content (32 pages)

PAGE 1
MCP1725 500 mA, Low Voltage, Low Quiescent Current LDO Regulator Features 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.
PAGE 2
MCP1725 Typical Application MCP1725 Fixed Output Voltage VIN = 2.3V to 2.8V C1 4.7 µF 1 VIN VOUT 8 2 VIN Sense 7 3 SHDN CDELAY 6 4 GND VOUT = 1.8V @ 500 mA C2 1 µF PWRGD 5 C3 1000 pF On R1 100 kΩ Off PWRGD MCP1725 Adjustable Output Voltage VIN = 2.3V to 2.8V C1 4.7 µF 1 VIN VOUT 8 2 VIN ADJ 7 3 SHDN CDELAY 6 4 GND VOUT = 1.2V @ 500 mA R1 40 kΩ R3 100 kΩ PWRGD 5 On Off C2 1 µF C3 1000 pF R2 20 kΩ PWRGD DS22026B-page 2 © 2007 Microchip Technology Inc.
PAGE 3
MCP1725 Functional Block Diagram - Adjustable Output PMOS VIN VOUT Undervoltage Lock Out (UVLO) ISNS Cf Rf SHDN ADJ Overtemperature Sensing + Driver w/limit and SHDN EA – SHDN VREF V IN SHDN Reference Soft-Start Comp TDELAY PWRGD GND 92% of VREF © 2007 Microchip Technology Inc.
PAGE 4
MCP1725 Functional Block Diagram - Fixed Output PMOS VIN VOUT Undervoltage Lock Out (UVLO) ISNS Cf Rf SHDN Sense Overtemperature Sensing + Driver w/limit and SHDN EA – SHDN VREF V IN SHDN Reference Soft-Start Comp TDELAY PWRGD GND 92% of VREF DS22026B-page 4 CDELAY © 2007 Microchip Technology Inc.
PAGE 5
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 ................
PAGE 6
MCP1725 AC/DC CHARACTERISTICS (CONTINUED) Electrical 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 VIN-VOUT — 210 350 mV VPWRGD_VIN 1.0 — 6.0 V 1.2 — 6.0 Conditions Dropout Characteristics Dropout Voltage IOUT = 500 mA, (Note 5) VIN(MIN) = 2.
PAGE 7
MCP1725 AC/DC CHARACTERISTICS (CONTINUED) Electrical 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 TOR — 100 — µs eN — 2.
PAGE 8
MCP1725 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.
PAGE 9
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. 150 VOUT = 5.0V 0.20 0.15 VOUT = 2.5V 0.10 0.05 Quiescent Current (µA) Dropout Voltage (V) 0.25 0.00 IOUT = 0 mA 140 +130°C 130 120 110 +90°C 100 0°C 90 -45°C 80 0 100 200 300 400 500 2 3 Load Current (mA) Quiescent Current (µA) Dropout Voltage (V) 150 0.26 0.24 VOUT = 5.
PAGE 10
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. 0.050 IOUT = 0 mA Line Regulation (%/V) Quiescent Current (µA) 140 130 120 VOUT = 2.5V 110 100 VOUT = 0.8V 90 80 0.045 0.040 0.035 IOUT = 50 mA 0.030 0.025 0.020 IOUT = 250 mA 0.015 IOUT = 100 mA -20 5 30 55 80 105 130 -45 -20 5 Junction Temperature (°C) 1.0 0.9 0.8 0.7 0.
PAGE 11
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 10 0.15 Noise (μV/¥Hz) Dropout Voltage (V) VOUT = 5.0V VIN = 3.3V VOUT = 2.5V 0.20 VOUT = 2.5V 0.10 0.05 0.00 0 100 200 300 400 500 1 0.1 VIN = 2.3V VOUT = 0.8V 0.01 0.001 0.01 0.1 Load Current (mA) FIGURE 2-19: Current. Dropout Voltage (V) 0.
PAGE 12
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 -10 PSRR (dB) -20 -30 -40 VR=2.5V Fixed COUT=4.7 μF ceramic X7R VIN=3.3V CIN=0 μF IOUT=10 mA -50 -60 -70 -80 0.01 0.1 1 10 Frequency (KHz) 100 1000 FIGURE 2-25: Power Supply Ripple Rejection (PSRR) vs. Frequency (VOUT = 2.5V Fixed). FIGURE 2-28: Shutdown. 2.5V (Adj.
PAGE 13
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. FIGURE 2-31: (5.0V Fixed). Dynamic Line Response FIGURE 2-33: Dynamic Load Response (2.5V Fixed, 1 mA to 500 mA). FIGURE 2-32: (2.5V Fixed). Dynamic Line Response FIGURE 2-34: Dynamic Load Response (2.5V Fixed, 10 mA to 500 mA). © 2007 Microchip Technology Inc.
PAGE 14
MCP1725 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE Fixed Output Adjustable Output Name 1 1 VIN Input Voltage Supply 2 2 VIN Input Voltage Supply 3 3 SHDN 4 4 GND 5 5 PWRGD Power Good Output (open-drain) 6 6 CDELAY Power Good Delay Set-Point Input — 7 ADJ 7 — Sense 8 8 VOUT Exposed Pad Exposed Pad EP 3.1 Input Voltage Supply (VIN) Connect the unregulated or regulated input voltage source to VIN.
PAGE 15
MCP1725 3.6 3.6.1 Output Voltage Sense/Adjust Input (ADJ/Sense) ADJ For adjustable applications, the output voltage is connected to the ADJ input through a resistor divider that sets the output voltage regulation value. This provides the user the capability to set the output voltage to any value they desire within the 0.8V to 5.0V range of the device. 3.6.
PAGE 16
MCP1725 4.0 DEVICE OVERVIEW EQUATION 4-2: The MCP1725 is a high output current, Low Dropout (LDO) voltage regulator with an adjustable delay power-good output and shutdown control input. The low dropout voltage of 210 mV typical at 0.5A of current makes it ideal for battery-powered applications. Unlike other high output current LDOs, the MCP1725 only draws a maximum of 220 µA of quiescent current. 4.1 The MCP1725 LDO is available with either a fixed output voltage or an adjustable output voltage.
PAGE 17
MCP1725 4.4 Input Capacitor Low input source impedance is necessary for the LDO output to operate properly. When operating from batteries, or in applications with long lead length (> 10 inches) between the input source and the LDO, some input capacitance is recommended. A minimum of 1.0 µF to 4.7 µF is recommended for most applications. For applications that have output step load requirements, the input capacitance of the LDO is very important.
PAGE 18
MCP1725 4.6 CDELAY Input 4.7 The CDELAY input is used to provide the power-up delay timing for the power good output, as discussed in the previous section. By adding a capacitor from the CDELAY pin to ground, the PWRGD power-up time delay can be adjusted from 200 µs (no capacitance on CDELAY) to 300 ms (0.1 µF of capacitance on CDELAY). See Section 1.0 “Electrical Characteristics” for CDELAY timing tolerances.
PAGE 19
MCP1725 4.8 Dropout Voltage and Undervoltage Lockout Dropout voltage is defined as the input-to-output voltage differential at which the output voltage drops 2% below the nominal value that was measured with a VR + 0.6V differential applied. The MCP1725 LDO has a very low dropout voltage specification of 210 mV (typical) at 0.5A of output current. See Section 1.0 “Electrical Characteristics” for maximum dropout voltage specifications. The MCP1725 LDO operates across an input voltage range of 2.3V to 6.
PAGE 20
MCP1725 5.0 APPLICATION CIRCUITS/ ISSUES 5.1 Typical Application In addition to the LDO pass element power dissipation, there is power dissipation within the MCP1725 as a result of quiescent or ground current. The power dissipation as a result of the ground current can be calculated using the following equation: The MCP1725 is used for applications that require high LDO output current and a power good output. EQUATION 5-2: P I ( GND ) = V IN ( MAX ) × I VIN Where: MCP1725-2.5 VIN = 3.3V VOUT = 2.
PAGE 21
MCP1725 The maximum power dissipation capability for a package can be calculated given the junction-toambient thermal resistance and the maximum ambient temperature for the application. Equation 5-4 can be used to determine the package maximum internal power dissipation. EQUATION 5-4: ( T J ( MAX ) – T A ( MAX ) ) P D ( MAX ) = --------------------------------------------------Rθ JA PD(MAX) = Maximum device power dissipation TJ(MAX) = maximum continuous junction temperature 5.
PAGE 22
MCP1725 5.3.2 JUNCTION TEMPERATURE ESTIMATE To estimate the internal junction temperature, the calculated temperature rise is added to the ambient or offset temperature. For this example, the worst-case junction temperature is estimated below: 5.4 CDELAY Calculations (typical) ΔT C = I • ------ΔV Where: C = CDELAY Capacitor I = CDELAY charging current, 140 nA typical. ΔT = time delay ΔV = CDELAY threshold voltage, 0.42V typical TJ = TJRISE + TA(MAX) TJ = 38.8°C + 60.0°C TJ = 98.
PAGE 23
MCP1725 6.0 PACKAGING INFORMATION 6.1 Package Marking Information 8-Lead DFN (2x3) Example: Standard Extended Temp XXX YWW NN Code Voltage Options * Code ABL 750 25 Voltage Options * ABL 0.8 ABR 3.0 ABM 1.2 ABS 3.3 ABP 1.8 ABT 5.0 ABQ 2.5 ABU ADJ * Custom output voltages available upon request. Contact your local Microchip sales office for more information. 8-Lead SOIC (150 mil) XXXXXXXX XXXXYYWW NNN Legend: XX...
PAGE 24
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PAGE 25
MCP1725 /HDG 3ODVWLF 6PDOO 2XWOLQH 61 ± 1DUURZ PP %RG\ >62,&@ 1RWH )RU WKH PRVW FXUUHQW SDFNDJH GUDZLQJV SOHDVH VHH WKH 0LFURFKLS 3DFNDJLQJ 6SHFLILFDWLRQ ORFDWHG DW KWWS ZZZ PLFURFKLS FRP SDFNDJLQJ D e N E E1 NOTE 1 1 2 3 α h b h A2 A c φ L A1 L1 8QLWV 'LPHQVLRQ /LPLWV 1XPEHU RI 3LQV β 0,//,0(7(56 0,1 1 120 0$; 3LWFK H 2YHUDOO +HLJKW $ ± %6& ± 0ROGHG 3DFNDJH 7KLFNQHVV $ ± ± 6WDQGRII $ ± 2YHUDOO :LGWK ( 0ROGHG 3DFNDJH :LGWK (
PAGE 27
MCP1725 APPENDIX A: REVISION HISTORY Revision B (December 2007) • Updated Temperature Specifications in Section 1.0 “Electrical Characteristics”. • Updated Section 6.0 “Packaging Information”. • Updated Templates. Revision A (December 2006) • Original Release of this Document. © 2007 Microchip Technology Inc.
PAGE 29
MCP1725 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device XX X X X/ XX Output Feature Tolerance Temp. Package Voltage Code Device: MCP1725: 500 mA Low Dropout Regulator MCP1725T: 500 mA Low Dropout Regulator Tape and Reel Output Voltage *: 08 12 18 25 30 33 50 = = = = = = = 0.8V “Standard” 1.2V “Standard” 1.8V “Standard” 2.5V “Standard” 3.0V “Standard” 3.3V “Standard” 5.
PAGE 31
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 32
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