MCP1727T-5002ESN_技术文档

MCP1727

1.5A, Low Voltage, Low Quiescent Current LDO Regulator

Features

Description

• 1.5A Output Current Capability

The MCP1727 is a 1.5A Low Dropout (LDO) linear

regulator that provides high current and low output

voltages in a very small package. The MCP1727

comes in a fixed (or adjustable) output voltage version,

with an output voltage range of 0.8V to 5.0V. The 1.5A

output current capability, combined with the low output

voltage capability, make the MCP1727 a good choice

for new sub-1.8V output voltage LDO applications that

have high current demands.

• 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: 330 mV Typical at 1.5A

• Typical Output Voltage Tolerance: 0.5%

• Stable with 1.0 µF Ceramic Output Capacitor

• Fast response to Load Transients

The MCP1727 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.

• Low Supply Current: 120 µA (typ)

• Low Shutdown Supply Current: 0.1 µA (typ)

• Adjustable Delay on Power Good Output

Using CMOS construction, the quiescent current

consumed by the MCP1727 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.

• Short Circuit Current Limiting and

Overtemperature Protection

• 3x3 DFN-8 and SOIC-8 Package Options

Applications

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_DELAYpin to

adjust the delay from 200 µs to 300 ms.

• High-Speed Driver Chipset Power

• Networking Backplane Cards

• Notebook Computers

• Network Interface Cards

• Palmtop Computers

The overtemperature and short circuit current-limiting

provide additional protection for the LDO during system

fault conditions.

• 2.5V to 1.XV Regulators

Package Types

Adjustable (SOIC-8)

Fixed (SOIC-8)

Adjustable (3x3 DFN)

Fixed (3x3 DFN)

V

8

7

6

5

V

OUT

V

IN

1

2

V

1

2

3

4

8

7

6

5

V

IN

V

1

2

3

4

V

OUT

1

2

3

4

8

7

6

5

IN

8

7

6

5

IN

OUT

ADJ

C

Sense

V

Sense

ADJ

IN

3

4

SHDN

GND

C

DELAY

SHDN

GND

DELAY

C

SHDN

GND

SHDN

GND

C

DELAY

PWRGD

DS21999B-page 1

MCP1727

Typical Application

MCP1727 Fixed Output Voltage

V_OUT= 1.8V @ 1A

V_IN= 2.3V to 2.8V

1

2

3

4

V_OUT

8

V_IN

Sense 7

C₁

4.7 µF

C₂

1 µF

SHDN C_DELAY

6

R₁

100 kΩ

GND PWRGD 5

C₃

On

1000 pF

Off

PWRGD

MCP1727 Adjustable Output Voltage

V_OUT= 1.2V @ 1A

V_IN= 2.3V to 2.8V

1

2

3

4

V_OUT

ADJ

8

7

6

V_IN

R₁

40 kΩ

C₁

4.7 µF

C₂

1 µF

SHDN C_DELAY

R₃

100 kΩ

GND PWRGD 5

On

R₂

20 kΩ

C₃

1000 pF

Off

PWRGD

DS21999B-page 2

MCP1727

Functional Block Diagram - Adjustable Output

PMOS

V_IN

V_OUT

Undervoltage

Lock Out

(UVLO)

I_SNS

C_f

R_f

SHDN

ADJ

+

–

Driver w/limit

and SHDN

EA

Overtemperature

Sensing

SHDN

V_REF

V

IN

Reference

SHDN

Soft-Start

PWRGD

T_DELAY

Comp

GND

92% of V_REF

C_DELAY

DS21999B-page 3

MCP1727

Functional Block Diagram - Fixed Output

PMOS

V_IN

V_OUT

Undervoltage

Lock Out

(UVLO)

I_SNS

C_f

R_f

SHDN

Sense

+

–

Driver w/limit

and SHDN

EA

Overtemperature

Sensing

SHDN

V_REF

V

IN

Reference

SHDN

Soft-Start

PWRGD

C_DELAY

Comp

T_DELAY

GND

92% of V_REF

DS21999B-page 4

MCP1727

† Notice: Stresses above those listed under “Maximum Rat-

ings” 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. Expo-

sure to maximum rating conditions for extended periods may

affect device reliability.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings †

V_IN....................................................................................6.5V

Maximum Voltage on Any Pin .. (GND – 0.3V) to (V_DD+ 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, T_J...........................+150°C

ESD protection on all pins (HBM/MM) ........... ≥ 2 kV; ≥ 200V

AC/DC CHARACTERISTICS

Electrical Specifications: Unless otherwise noted, V_IN= V_OUT(MAX)+ V_DROPOUT(MAX)(Note 1), V_R=1.8V for Adjustable Output,

_OUT= 1 mA, C_IN= C_OUT= 4.7 µF (X7R Ceramic), T_A= +25°C.

Boldface type applies for junction temperatures, T_J(Note 7) of -40°C to +125°C

I

Parameters

Sym

Min

Typ

Max

Units

Conditions

Input Operating Voltage

Input Quiescent Current

V_IN

I_q

2.3

6.0

V

Note 1

I_L= 0 mA, V_IN= Note 1,

_OUT= 0.8V to 5.0V

—

120

0.1

220

µA

V

Input Quiescent Current for

SHDN Mode

I_SHDN

I_OUT

—

1.5

—

3

—

µA

A

SHDN = GND

Maximum Output Current

—

V_IN= 2.3V to 6.0V

V

_R= 0.8V to 5.0V, Note 1

Line Regulation

ΔV_OUT

(V_OUTx ΔV_IN

/

0.05

±0.5

2.2

0.16

1.0

—

%/V

%

(Note 1) ≤ V_IN≤ 6V

)

Load Regulation

ΔV_OUT/V_OUT

-1.0

—

I_OUT= 1 mA to 1.5A,

V

_IN= Note 1, (Note 4)

Output Short Circuit Current

I_{OUT_SC}

A

V_IN= Note 1, R_LOAD< 0.1Ω,

Peak Current

Adjust Pin Characteristics (Adjustable Output Only)

Adjust Pin Reference Voltage

V_ADJ

0.402

0.410

0.418

V

V_IN= 2.3V to V_IN= 6.0V,

I

_OUT= 1 mA

Adjust Pin Leakage Current

I_ADJ

-10

—

±0.01

40

+10

—

nA

V_IN= 6.0V, V_ADJ= 0V to 6V

Adjust Temperature Coefficient

TCV_OUT

ppm/°C Note 3

Fixed-Output Characteristics (Fixed Output Only)

Voltage Regulation V_OUT

V_R- 2.5%

V_R

V_R+ 2.5%

V

Note 2

±0.5%

Note 1: The minimum V_INmust meet two conditions: V_IN≥ 2.3V and V_IN≥ V_OUT(MAX)+ V_{DROPOUT(MAX).}

2: V_Ris the nominal regulator output voltage for the fixed cases. V_R= 1.2V, 1.8V, etc. V_Ris the desired set point output

voltage for the adjustable cases. V_R= V_{ADJ *}((R₁/R₂)+1). Figure 4-1.

3: TCV_OUT= (V_OUT-HIGH– V_OUT-LOW) *10⁶/ (V_R* ΔTemperature). V_OUT-HIGHis the highest voltage measured over the

temperature range. V_OUT-LOWis the lowest voltage measured over the temperature range.

4: 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 V_OUT= V_R+ V_DROPOUT(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., T_A, T_J, θ_JA). 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.

DS21999B-page 5

MCP1727

AC/DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise noted, V_IN= V_OUT(MAX)+ V_DROPOUT(MAX)(Note 1), V_R=1.8V for Adjustable Output,

I

_OUT= 1 mA, C_IN= C_OUT= 4.7 µF (X7R Ceramic), T_A= +25°C.

Boldface type applies for junction temperatures, T_J(Note 7) of -40°C to +125°C

Parameters

Sym

Min

Typ

Max

550

Units

Conditions

Dropout Characteristics

Dropout Voltage

V

_IN-V_OUT

—

330

mV

Note 5, I_OUT= 1.5A,

V

_IN(MIN)= 2.3V

Power Good Characteristics

PWRGD Input Voltage Operat-

ing Range

V_{PWRGD_VIN}

1.0

—

6.0

V

T_A= +25°C

1.2

6.0

T_A= -40°C to +125°C

For V_IN< 2.3V, I_SINK= 100 µA

PWRGD Threshold Voltage

V_{PWRGD_TH}

—

89

90

1.0

—

92

—

95

%V_OUTFalling Edge

V_OUT< 2.5V Fixed, V_OUT= Adj.

(Referenced to V_OUT

)

92

94

V_OUT>= 2.5V Fixed

PWRGD Threshold Hysteresis

PWRGD Output Voltage Low

V_{PWRGD_HYS}

V_{PWRGD_L}

2.0

0.2

3.0

0.4

%V_OUT

V

I_{PWRGD SINK}= 1.2 mA,

ADJ = 0V, SENSE = 0V

PWRGD Leakage

P_WRGD

_

—

1

—

nA

V_PWRGD= V_IN= 6.0V

Rising Edge

LK

PWRGD Time Delay

T_PG

R_PULLUP= 10 kΩ

I_CDELAY

= 140 nA (Typ)

C_DELAY= OPEN

—

10

—

200

30

—

55

—

µs

ms

µs

C_DELAY= 0.01 µF

C_DELAY= 0.1 µF

300

200

Detect Threshold to PWRGD

Active Time Delay

T_VDET-PWRGD

V_ADJor V_SENSE= V_{PWRGD_TH}

20 mV to V_{PWRGD_TH}- 20 mV

+

Shutdown Input

Logic High Input

V_SHDN-HIGH

V_SHDN-LOW

SHDN_ILK

45

%V_IN

µA

V_IN= 2.3V to 6.0V

Logic Low Input

15

SHDN Input Leakage Current

-0.1

±0.001

100

+0.1

V_IN= 6V, SHDN =V_IN

SHDN = GND

,

AC Performance

Output Delay From SHDN

T_OR

µs

SHDN = GND to V_IN

V

_OUT= GND to 95% V_R