MIC2877 6A ISW, Synchronous Boost Regulator with Bi-Directional Load Disconnect

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 2017 Microchip Technology Inc.

DS20005873A-page 1

MIC2877

Features

• Typical 6.5A Input Peak Current Limit
• Up to 95% Efficiency
• Fully Integrated, High-Efficiency, 2 MHz Switching 

Frequency

• Bidirectional True Load Disconnect, Overvoltage 

Protection (OVP) and Undervoltage Lockout 
(UVLO)

• Controlled Pre-Charge Current Limit at Start-Up
• Ultra-Fast Transient Response
• Input Voltage Range from 2.5V to 5.5V
• Maximum Output Current:

- 1.5A,  V

IN

= 2.5V and V

OUT

= 5V

- 2A,V

IN

= 3V and V

OUT

= 5V

• Output Voltage Range:

- Adjustable
- Fixed Versions: 4.75V, 5V, 5.25V, 5.5V

• Integrated Anti-Ringing Switch for 

Electromagnetic Interference (EMI) Reduction

• Typically Less than 2 µA Shutdown Current
• Internal Compensation
• Bypass Mode for V

IN

≥ V

OUT

• Power Good (PG) Output
• Overcurrent Protection and Thermal Shutdown
• Fixed and Adjustable Output Versions
• Available Package: 8-pin FTQFN 2 x 2 mm

Applications

• USB OTG and HDMI Hosts
• Portable Power Reserve Supplies
• High-Current Parallel Lithium Cell Applications
• Portable Equipment

General Description

The MIC2877 is a compact and highly efficient 2 MHz
synchronous boost regulator with a typically 6.5A
switch. It features a bidirectional true load disconnect
function that prevents any leakage current between the
input and output when the device is disabled
(EN = GND), it protects the input supply and improves
the start-up performance.
The MIC2877 has the input voltage range between
2.5V and 5.5V and provides a 2A output continuous
current for V

IN

= 3.0V and V

OUT

= 5V. Fixed and

adjustable versions are available.
The MIC2877 operates in Bypass mode automatically
when the input voltage is higher or equal to the target
output voltage. At light loads, the boost converter goes
to Pulse Frequency Modulation (PFM) mode to
improve the efficiency. In Shutdown mode (EN = GND),
the regulator typically consumes less than 2 µA.
The MIC2877 also features an integrated anti-ringing
switch to minimize EMI, overvoltage and overcurrent
protection, UVLO and thermal shutdown.
The MIC2877 is available in an 8-pin FTQFN 2 x 2 mm
package.

Package Types

MIC2877 

(Fixed Output)

8-pin 2 x 2 mm FTQFN

MIC2877 

(Adjustable Output)

8-pin 2 x 2 mm FTQFN

A

GND

V

IN

P

GND

V

OUT

SW

PG

EN

V

OUTS

A

GND

V

IN

P

GND

V

OUT

SW

PG

EN

FB

2 MHz Synchronous Low Voltage Step-Up Regulator

with 6.5A Switch and Bidirectional Load Disconnect

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MIC2877

DS20005873A-page 2

 2017 Microchip Technology Inc.

Typical Application Schematics

MIC2877 (Fixed Output)

MIC2877 (Adjustable Output)

MIC2877 Efficiency vs. Load Current

0

10

20

30

40

50

60

70

80

90

100

1

10

100

1000

Efficiency

 (%

)

I

OUT

(mA)

V

OUT

= 5V

L = 1 µH
C

OUT

= 3 x 22 µF

V

IN

= 2.5V

V

IN

= 3.3V

V

IN

= 4.5V

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 2017 Microchip Technology Inc.

DS20005873A-page 3

MIC2877

Functional Block Diagrams

MIC2877 (Fixed Output)

OUT

/PG

OUTS

REFERENCE 

GENERATOR

EN

V

IN

PWM 

LOGIC

CONTROL

+

MINIMUM 

SWITCHING

2 MHz 

OSCILLATOR

CURRENT 

SENSE

+

SLOPE

COMPENSATION

PWM

VREF

SOFT

START

V

IN

BODY

DRIVER

OC

OV FB

OV REF

SW

HS 

DRIVER

LS 

DRIVER

A

GND

OVP 

P

GND

ANTI -

RINGING

V

IN

6A

MIC2877 (Adjustable Output)

REFERENCE 

GENERATOR

EN

V

IN

PWM 

LOGIC

CONTROL

+

MINIMUM 

SWITCHING

2 MHz 

OSCILLATOR

CURRENT 

SENSE

+

SLOPE

COMPENSATION

PWM

VREF

SOFT

START

V

IN

BODY

DRIVER

OC

PGL

PGH

OV FB

OV REF

SW

OUT

/PG

FB

HS 

DRIVER

LS 

DRIVER

A

GND

OVP 

P

GND

ANTI -

RINGING

6.5A

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MIC2877

DS20005873A-page 4

 2017 Microchip Technology Inc.

1.0

ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings †

V

IN

, EN, OUT, FB/V

OUTs

, PG, SW to P

GND

.................................................................................................. –0.3V to +6V

A

GND

 to P

GND

............................................................................................................................................ –0.3V to +0.3V

EN to A

GND

.................................................................................................................................................. –0.3V to +6V

Power Dissipation............................................................................................................................... Internally Limited

(

1

)

Lead Temperature (soldering, 10 seconds)...........................................................................................................+260°C
Junction Temperature (T

J

)......................................................................................................................–40°C to +150°C

Storage Temperature (T

S

) ......................................................................................................................–40°C to +150°C

ESD Rating Human Body Model (HBM)

(

2

)

.................................................................................................................2 kV

ESD Rating Machine Model (MM)

(

2

)

.........................................................................................................................200V

Operating Ratings ‡

Supply Voltage (V

IN

).................................................................................................................................. +2.5V to +5.5V

Output Voltage (V

OUT

)................................................................................................................................... V

IN

 to +5.5V

Enable Voltage (V

EN

) ......................................................................................................................................... 0V to V

IN

Junction Temperature (T

J

)......................................................................................................................–40°C to +125°C

Operating Ambient Temperature (T

A

).......................................................................................................–40°C to +85°C

Package Thermal Resistance FTQFN22-8LD (

JA

) ........................................................................................... +50°C/W

 Notice: Stresses above those listed under “Absolute 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 sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice:

 The device is not guaranteed to function outside its operating ratings.

Note 1:

The maximum allowable power dissipation of any T

A

 (ambient temperature) is P

D(max)

= (T

J(max)

– T

A

)/θ

JA

.

Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the
regulator will go into thermal shutdown.

2:

Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF.

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 2017 Microchip Technology Inc.

DS20005873A-page 5

MIC2877

ELECTRICAL CHARACTERISTICS

Electrical Characteristics:

 V

IN

= 3V,  V

OUT

= 5V,  C

IN

= 22 µF,  C

OUT

= 3 x 22 µF,  L = 1 µH,  T

A

= +25°C. Bold values 

are valid for –40°C ≤ T

A

< +85°C, unless otherwise noted. (

Note 1

)

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Power Supply

Supply Voltage Range

V

IN

2.5

5.5

V

Output Voltage

V

OUT

V

IN

5.5

V

UVLO Rising Threshold

UVLO

(r)

2.29

2.49

V

UVLO Hysteresis

UVLO

HYS

200

mV

Quiescent Current

I

VIN

125

180

µA

Non-Switching

V

IN

 Shutdown Current

I

VINSD

1

3

µA

V

IN

= 5.5V, V

OUT

= 0V, 

EN = 0

V

OUT

 Shutdown Current

I

VOUTSD

1

3

µA

V

IN

= 0V,  V

OUT

= 5.5V, 

EN = 0

Overtemperature Shutdown 
Threshold

T

SD

+155

°C

Overtemperature Shutdown 
Hysteresis

T

SD-HYS

+15

°C

Boost Converter

Feedback Voltage

V

FB

0.8865

0.9135

V

Adjustable version

Line Regulation

0.3

%

2.5V < V

IN

< 4.5V, 

I

OUT

= 0.5A

Load Regulation

0.2

%/A

I

OUT

= 300 mA to 1.2A

Overvoltage Protection 
Threshold

V

OVD

6.6

6.75

V

Minimum Controllable On Time

T

ONMIN

35

ns

Maximum Duty Cycle

D

MAX

93.6

%

Low-Side Switch Current Limit 
(

Note 2

)

I

SW

4.8

6.5

7.2

A

V

IN

= 3V,  V

OUT

= 5V

Switch-on Resistance

R

PMOS

45

mΩ

V

IN

= 3V,  V

OUT

= 5V, 

I

SW

= 200 mA

R

NMOS

33

Switch Leakage Current

I

SW

0.2

5

µA

V

EN

= 0V,  V

SW

= 5.5V

Oscillator Frequency

f

SW

1.6

2

2.4

MHz

Pre-Charge Current Limit

I

PRE-CHARGE

0.27

0.5

0.76

A

V

OUT

 0.5V

1.7

2.55

3.2

V

IN

= 4.5V,  V

OUT

= 3V

Soft Start Charge Time

I

SS

1.1

2

ms

V

OUT

= 5V,  V

IN

= 3V, 

C

OUT

= 22 µF x 3

EN/PG Control Pins

EN Threshold (

Note 3

)

V

EN

1.5

V

IN

V

Device enabled

0.4

Device disabled

Note 1:

Specification for packaged product only.

2:

Data from design and characterization. Not production tested.

3:

If the EN pin is externally driven High before V

IN 

is applied, a 200kΩ series resistor is required on the EN 

signal to the pin.

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MIC2877

DS20005873A-page 6

 2017 Microchip Technology Inc.

EN Input Current

1.5

µA

EN = 3V

Power Good Threshold (Rising)

V

PG-THR

0.91 x V

FB

V

Adjustable version

0.91 x V

OUT

Fixed version

Power Good Threshold (Falling)

V

PG-THF

0.82 x V

FB

V

Adjustable version

0.83 x V

OUT

Fixed version

ELECTRICAL CHARACTERISTICS (CONTINUED)

Electrical Characteristics:

 V

IN

= 3V,  V

OUT

= 5V,  C

IN

= 22 µF,  C

OUT

= 3 x 22 µF,  L = 1 µH,  T

A

= +25°C. Bold values 

are valid for –40°C ≤ T

A

< +85°C, unless otherwise noted. (

Note 1

)

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Note 1:

Specification for packaged product only.

2:

Data from design and characterization. Not production tested.

3:

If the EN pin is externally driven High before V

IN 

is applied, a 200kΩ series resistor is required on the EN 

signal to the pin.

TEMPERATURE SPECIFICATIONS

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Temperature Ranges
Power Dissipation

Internally Limited

(

1

)

Lead Temperature

+260

°C

Soldering, 10s

Junction Temperature

T

J

–40

+125

°C

Storage Temperature

T

S

–40

+150

°C

Operating Ambient Temperature

T

A

–40

+85

°C

Package Thermal Resistances
Thermal Resistance FTQFN22-8LD

JA

+50

°C/W

Note 1:

The maximum allowable power dissipation of any T

A

 (ambient temperature) is 

P

D(max)

= (T

J(max)

– T

A

)/θ

JA

. Exceeding the maximum allowable power dissipation will result in excessive 

die temperature, and the regulator will go into thermal shutdown.

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DS20005873A-page 7

MIC2877

2.0

TYPICAL PERFORMANCE CURVES 

FIGURE 2-1:

Efficiency vs. Load Current, 

Adjustable Output Version. 

FIGURE 2-2:

Output Voltage vs. Load 

Current, Adjustable Output Version.

FIGURE 2-3:

Switching Frequency vs. 

Input Voltage, Adjustable Output Version.

FIGURE 2-4:

Feedback Voltage vs. Load 

Current (T

A

=

40°C), Adjustable Output Version.

FIGURE 2-5:

Feedback Voltage vs. Load 

Current (T

A

=

+

25°C), Adjustable Output Version.

FIGURE 2-6:

Feedback Voltage vs. Load 

Current (T

A

= +85°C), Adjustable Output Version.

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.

0

10

20

30

40

50

60

70

80

90

100

1

10

100

1000

Efficiency

 (%

)

I

OUT

(mA)

V

OUT

= 5V

L = 1 µH
C

OUT

= 3 x 22 µF

V

IN

= 2.5V

V

IN

= 3.3V

V

IN

= 4.5V

4.9

4.92

4.94

4.96

4.98

5

5.02

5.04

5.06

5.08

5.1

0

0.25

0.5

0.75

1

1.25

V

OUT

(V)

I

OUT

(A)

V

IN

= 3V

L = 1 µH
C

OUT 

= 3 x 22 µF

T

A

= +25°C

T

A

= +85°C

T

A

= -40°C

1900

1920

1940

1960

1980

2000

2020

2.5

3

3.5

4

4.5

5

Sw

itching Frequency

 (kHz)

Input Voltage (V)

V

OUT

= 5V, I

OUT

= 0.5A

L = 1 µH, C

OUT

= 3 x 22 µF

T

A

= +25°C

T

A

= +85°C

T

A

= -40°C

0.87

0.88

0.89

0.9

0.91

0.92

0.93

1

10

100

1000

Feedback V

oltage (V)

I

OUT

(mA)

V

OUT

= 5V

L = 1 µH, T

A

= -40

o

C

C

OUT

= 3 x 22 µF

V

IN

= 2.5V

V

IN

= 3.3V

V

IN

= 4.5V

0.87

0.88

0.89

0.9

0.91

0.92

0.93

1

10

100

1000

Feedback V

oltage (V)

I

OUT

(mA)

V

OUT

= 5V

L = 1 µH, T

A

= +25

o

C

C

OUT

= 3 x 22 µF

V

IN

= 2.5V

V

IN

= 3.3V

V

IN

= 4.5V

0.87

0.88

0.89

0.9

0.91

0.92

0.93

1

10

100

1000

Feedback V

oltage (V)

I

OUT

(mA)

V

OUT

= 5V

L = 1 µH, T

A

= +85

o

C

C

OUT

= 3 x 22 µF

V

IN

= 2.5V

V

IN

= 3.3V

V

IN

= 4.5V

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MIC2877

DS20005873A-page 8

 2017 Microchip Technology Inc.

FIGURE 2-7:

Shutdown Current vs. Input 

Voltage, Adjustable Output Version.

FIGURE 2-8:

Power Good Threshold vs. 

Input Voltage, Adjustable Output Version.

FIGURE 2-9:

UVLO Threshold vs. Load 

Current, Adjustable Output Version.

FIGURE 2-10:

Enable to Start-Up Delay vs. 

Input Voltage, Adjustable Output Version.

FIGURE 2-11:

Maximum Output Current 

vs. Input Voltage, Adjustable Output Version.

FIGURE 2-12:

Load Transient (V

IN

= 3.3V), 

Adjustable Output Version

.

0

0.25

0.5

0.75

1

1.25

1.5

1.75

2

2.5

3

3.5

4

4.5

5

Shutdow

n

 Current 

(µA)

Input Voltage (V)

V

OUT

= 5V, EN = GND

Shutdown Mode, No Load

T

A

= -40

o

C

T

A

= +25

o

C

T

A

= +85

o

C

0.8

0.82

0.84

0.86

0.88

0.9

0.92

2.5

3

3.5

4

4.5

5

PG Threshold/V

FB

Input Voltage (V)

V

OUT

= 5V, I

OUT

= 0A

L = 1 µH, C

OUT

= 3 x 22 µF

RISING

FALLING

2.1

2.15

2.2

2.25

2.3

2.35

2.4

2.5

0

0.05

0.1

0.15

0.2

0.25

0.3

UVLO

Threshold

(V

Load Current (A)

V

OUT

= 5V, T

A

= +25

o

C

L = 1 µH, C

OUT

= 3 x 22 µF

RISING

FALLING

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

2.5

3

3.5

4

4.5

5

EN to Start-

Up Delay

 (ms) 

Input Voltage (V)

V

OUT

= 5V, I

OUT

= 1A

L = 1 µH, C

OUT

= 3 x 22 µF

T

A

= +25°C

T

A

= +85°C

T

A

= -40°C

0

1000

3000

4000

5000

6000

2.5

2.9

3.3

3.7

4.1

4.5

I

OU

7

Max

(mA)

V

IN

(V)

V

OUT

= 5V

L = 1 µH
C

OUT 

= 3 x 22 µF

T

A

= +25°C

T

A

= +85°C

T

A

= -40°C

V

IN

= 3.3V

V

OUT

= 5V

Load Step: 0.01A to 1.5A
T

A

= 25°C

V

SW

5V/div

PG
2V/div

V

OUT

200 mV/div
AC Coupled

I

OUT

1A/div

400 µs/div

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DS20005873A-page 9

MIC2877

FIGURE 2-13:

Load Transient

 (

V

IN

= 4V), 

Adjustable Output Version

.

FIGURE 2-14:

Load Transient 

(

V

IN

= 4.75V), Adjustable Output Version.

FIGURE 2-15:

Line Transient (V

IN

=

2.5V to 

3.5V), 

Adjustable Output Version

.

FIGURE 2-16:

Line Transient (V

IN

=

2.5V to 

4.5V), 

Adjustable Output Version

.

FIGURE 2-17:

Switching Waveforms 

(V

IN

= 2.5V,  V

OUT

  = 5V,  I

OUT

=

1.5A), 

Adjustable 

Output Version

.

FIGURE 2-18:

Switching Waveforms 

(V

IN

= 3V,  V

OUT

  = 5V,  I

OUT

=

2A), 

Adjustable 

Output Version.

V

IN

= 4V

V

OUT

= 5V

Load Step: 0.01A to 1.5A
T

A

= 25°C

V

SW

5V/div

PG
2V/div

V

OUT

200 mV/div
AC Coupled

I

OUT

1A/div

400 µs/div

V

IN

=4.75V

V

OUT

= 5V

Load Step: 0.01A to 1.5A
T

A

= 25°C

V

SW

5V/div

PG
2V/div

V

OUT

200 mV/div
AC Coupled

I

OUT

1A/div

400 µs/div

V

IN

= 2.5V  to  3.5V

I

OUT

= 1A

V

OUT

= 5V

L = 1 µH
C

OUT

= 3 x 22 µF

PG
2V/div

I

OUT

1A/div

V

OUT

200 mV/div
AC Coupled

V

IN

2V/div

400 µs/div

V

IN

= 2.5V to 4.5V

I

OUT

= 1A

V

OUT

= 5V

L = 1 µH
C

OUT

= 3 x 22 µF

PG
2V/div

I

OUT

1A/div

V

OUT

200 mV/div
AC Coupled

V

IN

2V/div

400 µs/div

PG
2V/div

V

SW

2V/div

V

OUT

50 mV/div, AC Coupled

I

L

2A/div

400 ns/div

PG
2V/div

V

SW

2V/div

V

OUT

50 mV/div, AC Coupled

I

L

2A/div

400 ns/div

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MIC2877

DS20005873A-page 10

 2017 Microchip Technology Inc.

FIGURE 2-19:

Soft Start in Boost Mode, 

Adjustable Output Version.

FIGURE 2-20:

Start-Up in Short Circuit 

(V

IN

= 4.5V, T

A

= +25°C), Adjustable Output 

Version.

FIGURE 2-21:

Bypass Mode, Adjustable 

Output Version.

FIGURE 2-22:

Start-Up in Short Circuit 

(V

IN

= 2.5V, T

A

= +25°C), Adjustable Output 

Version.

FIGURE 2-23:

Bidirectional True 

Shutdown. Shorted Input, Output Step from 0V to 
5V with EN = 0V. Adjustable Output Version.

FIGURE 2-24:

Bidirectional True 

Shutdown. Shorted Output, Supply Step from 0V 
to 5.0V with EN = 0V. Adjustable Output Version.

VIN = 3.3V
VOUT = 5V
IOUT = 0.5A
Resistive Load

PG
2V/div

EN
2V/div

V

OUT

2V/div

I

L

2A/div

400 µs/div

V

SW

2v/div

EN
2V/div

PG
500 mV/div

I

OUT

500 mA/div

V

OUT

= 5V

V

IN

= 4.5V

L = 1 µH
C

OUT

= 3 x 22 µF

4 ms/div

V

SW

5V/div

V

IN

1V/div

V

OUT

1V/div

I

L

1A/div

V

IN

= 4V  to  5.5V

V

OUT

= 5V

I

OUT

= 0.5A

1s/div

V

SW

2V/div

EN
2V/div

PG
500 mV/div
I

OUT

500 mA/div

V

OUT

= 5V

V

IN

= 2.5V

L = 1 µH
C

OUT

= 3 x 22 µF

4 ms/div

PG
5V/div

I

IN

500 mA/div

V

OUT

1V/div

V

IN

1V/div

V

IN

= GND = EN

V

OUT

= 0 to 5V step

C

IN

= 22 µF,  L = 1 µH

C

OUT

= 3 x 22 µF

400 µs/div

V

OUT

1V/div

PG
5V/div

I

OUT

500 mA/div

V

IN

1V/div

V

OUT

= GND = EN

V

IN

= 0 to 5V step

C

IN

= 22 µF,  L = 1 µH

C

OUT

= 3 x 22 µF

400 µs/div

Maker
Microchip Technology Inc.
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