MICROCHIP MCP1603 Technical data

MCP1603

1

2

3

4

5

L

X

VFB/V

OUT

SHDN

GND

V

IN

5-Lead TSOT

MCP1603

1

2

34

5

L

X

VFB/V

OUT

SHDN

GND

V

IN

MCP1603L

1

2

3

4

8

7

6

5

L

X

VFB/V

OUT

SHDN

GND V

IN

NC

8-Lead 2x3 DFN

2.0 MHz, 500 mA Synchronous Buck Regulator

Features

• Over 90% Typical Efficiency

• Output Current Up To 500 mA

• Low Quiescent Current = 45 µA, typical

• Low Shutdown Current = 0.1 µA, typical

• Adjustable Output Voltage:

- 0.8V to 4.5V

• Fixed Output Voltage:

- 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V

• 2.0 MHz Fixed-Frequency PWM (Heavy Load)

• Automatic PWM to PFM Mode Transition

• 100% Duty Cycle Operation

• Internally Compensated

• Undervoltage Lockout (UVLO)

• Overtemperature Protection

• Space Saving Packages:

- 5-Lead TSOT

- 8-Lead 2X3 DFN

Applications

• Cellular Telephones

• Portable Computers

• Organizers / PDAs

• USB Powered Devices

• Digital Cameras

• Portable Equipment

• +5V or +3.3V Distributed Systems

General Description

The MCP1603 is a high efficient, fully integrated 500 mA synchronous buck regulator whose 2.7V to

5.5V input voltage range makes it ideally suited for applications powered from 1-cell Li-Ion or 2-cell/3-cell NiMH/NiCd batteries.

At heavy loads, the MCP1603 operates in the 2.0 MHz fixed frequency PWM mode which provides a low noise, low output ripple, small-size solution. When the load is reduced to light levels, the MCP1603 automatically changes operation to a PFM mode to minimize quiescent current draw from the battery. No intervention is necessary for a smooth transition from one mode to another. These two modes of operation allow the MCP1603 to achieve the highest efficiency over the entire operating current range.

The MCP1603 is available with either an adjustable or fixed output voltage. The available fixed output voltage options are 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. When a fixed option is used, only three additional small external components are needed to form a complete solution. Couple this with the low profile, small-foot print packages and the entire system solution is achieved with minimal size.

Additional protection features include: UVLO, overtemperature, and overcurrent protection.

Package Types

MCP1603

V

IN

SHDN

GND

V

FB

L

X

VIN

2.7V To 4.5V

V

OUT

1.8V @ 500 mA

C

OUT

4.7 µF

C

IN

4.7 µF

L

1

4.7 µH

50

55

60

65

70

75

80

85

90

95

100

0.1 1 10 100 1000 Output Current (mA)

Efficiency (%)

V

OUT

= 1.8V

VIN = 2.7V

VIN = 3.6V

VIN = 4.5V

Typical Application Circuit

MCP1603

ILIM

PWM

ILIM

PFM

IPEAK

PWM

IPEAK

PFM

V

IN

SHDN

VFB/V

OUT

GND

L

X

Band

Gap

UVLO

Switch Drive

UVLO

V

REF

Logic and timing

S

RQ

Q

Soft Start

V

REF

PWM/PFM

Logic

V

REF

Slope Comp

OSC

-IPK Limit

UVLO

Thermal

Shutdown

TSD

EA

POFF NOFF

PWM/PFM

TSD

PFM Error Amp

PWM Error Amp

OV Threshold

UV Threshold

IPK Limit

-ILPK

IPEAK

PWM

IPEAK

PFM

Disable Switcher

-ILPK

Functional Block Diagram

MCP1603

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings †

VIN - GND.......................................................................+6.0V

All Other I/O ...............................(GND - 0.3V) to (V

to GND .............................................. -0.3V to (VIN + 0.3V)

L

X

Output Short Circuit Current..................................Continuous

Power Dissipation (Note 5)..........................Internally Limited

Storage Temperature.....................................-65°C to +150°C

Ambient Temp. with Power Applied.................-40°C to +85°C

Operating Junction Temperature...................-40°C to +125°C

ESD Protection On All Pins:

HBM..............................................................................4 kV

MM...............................................................................300V

+ 0.3V)

IN

† 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 sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability.

DC CHARACTERISTICS

Electrical Characteristics: Unless otherwise indicated, VIN = SHDN = 3.6V, C

I

= 100 mA, TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C.

OUT

Parameters Sym Min Typ Max Units Conditions

Input Characteristics

Input Voltage V Maximum Output Current I Shutdown Current I

IN_SHDN

Quiescent Current I

IN

OUT

Q

2.7 — 5.5 V Note 1

500 ——mANote 1

— 0.1 1 µA SHDN = GND —4560 µA SHDN = VIN, I

Shutdown/UVLO/Thermal Shutdown Characteristics

SHDN

, Logic Input Voltage Low V

SHDN

, Logic Input Voltage High V

SHDN, Input Leakage Current I

IL

IH

L_SHDN

——15 %VINVIN = 2.7V to 5.5V

45 ——%VINVIN = 2.7V to 5.5V

-1.0 ±0.1 1.0 µA VIN = 2.7V to 5.5V

Undervoltage Lockout UVLO 2.12 2.28 2.43 VV Undervoltage Lockout Hysteresis UVLO Thermal Shutdown T Thermal Shutdown Hysteresis T Note 1: The minimum V

has to meet two conditions: VIN ≥ 2.7V and VIN ≥ V

IN

SHD

SHD-HYS

HYS

— 140 — mV — 150 — °C Note 4, Note 5 —10—°CNote 4, Note 5

2: Reference Feedback Voltage Tolerance applies to adjustable output voltage setting.

is the output voltage setting.

3: V

R

4: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable

temperature and the thermal resistance from junction to air (i.e. T allowable power dissipation causes the device to initiate thermal shutdown.

5: The internal MOSFET switches have an integral diode from the L

to the GND pin. In cases where these diodes are forward-biased, the package power dissipation limits must be adhered to. Thermal protection is not able to limit the junction temperature for these cases.

6: The current limit threshold is a cycle-by-cycle peak current limit.

= CIN = 4.7 µF, L = 4.7 µH, V

OUT

Falling

IN

+ 0.5V.

OUT

, TJ, θJA). Exceeding the maximum

A

pin to the VIN pin, and from the LX pin

X

(ADJ) = 1.8V,

OUT

= 0 mA

OUT

MCP1603

DC CHARACTERISTICS (CONTINUED)

Electrical Characteristics: Unless otherwise indicated, VIN = SHDN = 3.6V, C

I

= 100 mA, TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C.

OUT

Parameters Sym Min Typ Max Units Conditions

Output Characteristics

Adjustable Output Voltage Range V Reference Feedback Voltage V

Reference Feedback Voltage To le r an c e

Feedback Input Bias Current I Output Voltage Tolerance Fixed V

V

Line Regulation V

Load Regulation V

Internal Oscillator Frequency F Start Up Time T R

P-Channel R

DSon

R

N-Channel R

DSon

L

Pin Leakage Current I

X

Positive Current Limit Threshold +I Note 1: The minimum V

has to meet two conditions: VIN ≥ 2.7V and VIN ≥ V

IN

LX(MAX)

OUT

FB

VFB

OUT

LINE-

REG

LOADREG

OSC

SS

DSon-P

DSon-N

LX

0.8 — 4.5 V Note 2

—0.8—V

-3.0 — +3.0 % TA = -40°C to +25°C

-2.5 — +2.5 % T —0.1—nA

-3.0% V

-2.5 V

R

—0.3—%/VV

—0.35—%VIN=VR+1.5V,

1.5 2.0 2.8 MHz

—0.6—msT — 500 — mΩ IP=100mA — 500 — mΩ IN= 100 mA

-1.0 ±0.1 1.0 µA SHDN =0V, VIN=5.5V,

— 860 — mA Note 6

2: Reference Feedback Voltage Tolerance applies to adjustable output voltage setting. 3: V

is the output voltage setting.

R

4: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable

temperature and the thermal resistance from junction to air (i.e. T allowable power dissipation causes the device to initiate thermal shutdown.

5: The internal MOSFET switches have an integral diode from the L

to the GND pin. In cases where these diodes are forward-biased, the package power dissipation limits must be adhered to. Thermal protection is not able to limit the junction temperature for these cases.

6: The current limit threshold is a cycle-by-cycle peak current limit.

= CIN = 4.7 µF, L = 4.7 µH, V

OUT

= +25°C to +85°C

A

+3.0% % TA = -40°C to +25°C, Note 3

+2.5 % TA = +25°C to +85°C, Note 3

= VR + 1V to 5.5V,

IN

=100mA

I

OUT

I

= 100 mA to 500 mA

LOAD

= 10% to 90%

R

LX=0V, LX=5.5V

+ 0.5V.

OUT

, TJ, θJA). Exceeding the maximum

A

pin to the VIN pin, and from the LX pin

X

(ADJ) = 1.8V,

OUT

MCP1603

TEMPERATURE SPECIFICATIONS

Electrical Specifications: Unless otherwise indicated, all limits are specified for: VIN+2.7Vto5.5V

Parameters Sym Min Typ Max Units Conditions

Temperature Ranges

Operating Junction Temperature Range

Storage Temperature Range T Maximum Junction Temperature T

Package Thermal Resistances

Thermal Resistance, 5L-TSOT θ

Thermal Resistance, 8L-2x3 DFN θ

T

J

A

J

JA

-40 — +125 °C Steady State

-65 — +150 °C — — +150 °C Transient

— 256 — °C/W Typical 4-layer Board with

Internal Ground Plane

— 84.5 — °C/W Typical 4-layer Board with

Internal Ground Plane and 2-Vias in Thermal Pad

MCP1603

40

41

42

43

44

45

46

47

48

49

50

-40 -25 -10 5 20 35 50 65 80 95 110 125

Ambient Temperature (

o

C)

Quiescent Current (µA)

V

OUT

= 1.8V

VIN = 4.2V

VIN = 3.0V

VIN = 3.6V

60

65

70

75

80

85

90

95

100

2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5

Input Voltage (V)

Efficiency (%)

V

OUT

= 1.2V

I

OUT

= 100 mA

I

OUT

= 500 mA

I

OUT

= 300 mA

70

75

80

85

90

95

100

2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5

Input Voltage (V)

Efficiency (%)

V

OUT

= 1.8V

I

OUT

= 100 mA

I

OUT

= 500 mA

I

OUT

= 300 mA

40

42

44

46

48

50

52

2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5

Input Voltage (V)

Quiescent Current (µA)

TA = - 40oC

TA = +25oC

TA = +90oC

20

30

40

50

60

70

80

90

100

0.1 1 10 100 1000

Output Current (mA)

Efficiency (%)

V

OUT

= 1.2V

VIN = 4.2V

VIN = 2.7V

VIN = 3.6V

20

30

40

50

60

70

80

90

100

0.1 1 10 100 1000

Output Current (mA)

Efficiency (%)

V

OUT

= 1.8V

VIN = 4.2V

VIN = 2.7V

VIN = 3.6V

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.

Note: Unless otherwise indicated, VIN= SHDN =3.6V, C T

= +25°C. Adjustable or fixed output voltage options can be used to generate the Typical Performance Characteristics.

A

OUT=CIN

FIGURE 2-1: IQ vs. Ambient Temperature.

= 4.7 µF, L = 4.7 µH, V

FIGURE 2-4: I

(ADJ) = 1.8V, I

OUT

vs. Input Voltage.

Q

LOAD

= 100 mA,

FIGURE 2-2: Efficiency vs. Input Voltage

= 1.2V).

(V

OUT

FIGURE 2-3: Efficiency vs. Input Voltage (V

OUT

= 1.8V).

FIGURE 2-5: Efficiency vs. Output Load

= 1.2V).

(V

OUT

FIGURE 2-6: Efficiency vs. Output Load

= 1.8V).

(V

OUT

MCP1603

75

80

85

90

95

100

33.544.555.5

Input Voltage (V)

Efficiency (%)

V

OUT

= 2.4V

I

OUT

= 100 mA

I

OUT

= 500 mA

I

OUT

= 300 mA

85.0

87.5

90.0

92.5

95.0

97.5

100.0

3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5

Input Voltage (V)

Efficiency (%)

V

OUT

= 3.3V

I

OUT

= 100 mA

I

OUT

= 500 mA

I

OUT

= 300 mA

0.1

0.2

0.3

0.4

0.5

0.6

-40 -25 -10 5 20 35 50 65 80 95 110 125

Ambient Temperature (

o

C)

Line Regualtion (%/V)

I

OUT

= 100 mA

I

OUT

= 300 mA

V

OUT

= 1.8V

30

40

50

60

70

80

90

100

0.1 1 10 100 1000

Output Current (mA)

Efficiency (%)

V

OUT

= 2.4V

VIN = 4.2V

VIN = 2.7V

VIN = 3.6V

30

40

50

60

70

80

90

100

0.1 1 10 100 1000 Output Current (mA)

Efficiency (%)

V

OUT

= 3.3V

VIN = 4.2V

VIN = 3.6V

1.74

1.75

1.76

1.77

1.78

1.79

1.80

1.81

1.82

100 150 200 250 300 350 400 450 500

Output Current (mA)

Output Voltage (V)

TA = +125 oC

TA = - 40 oC

TA = +25 oC

TA = +90 oC

Typical Performance Curves (Continued)

Note: Unless otherwise indicated, VIN= SHDN =3.6V, C

T

= +25°C. Adjustable or fixed output voltage options can be used to generate the Typical Performance Characteristics.

A

OUT=CIN

= 4.7 µF, L = 4.7 µH, V

(ADJ) = 1.8V, I

OUT

LOAD

= 100 mA,

FIGURE 2-7: Efficiency vs. Input Voltage (V

= 2.4V).

OUT

FIGURE 2-8: Efficiency vs. Input Voltage

= 3.3V).

(V

OUT

FIGURE 2-10: Efficiency vs. Output Load (V

= 2.4V).

OUT

FIGURE 2-11: Efficiency vs. Output Load

= 3.3V).

(V

OUT

FIGURE 2-9: Line Regulation vs. Ambient Temperature (V

OUT

= 1.8V).

FIGURE 2-12: Output Voltage vs. Load Current (V

OUT

= 1.8V).