MCP1661 datasheet(4/34 Pages) MICROCHIP

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MCP1661

DS20005315B-page 4

 2014-2015 Microchip Technology Inc.

Line Regulation

VFB/VFB)/

VIN|

—

0.05

0.5

%/V

VIN = 3V to 5V,

IOUT =20mA, VOUT =12.0V

Load Regulation

VFB/VFB|—

0.5

1.5

IOUT = 20 mA to 100 mA,

VIN = 3.3V, VOUT =12.0V

Overvoltage Reference

OVP_REF

—

FB to GND transition

(Note 4)

Maximum Duty Cycle

DCMAX

—

Note 4

Switching Frequency

fSW

425

500

575

kHz

±15%

EN Input Logic High

VIH

——

% of VIN IOUT =1 mA

EN Input Logic Low

VIL

——

7.5

% of VIN IOUT =1 mA

EN Input Leakage Current

IENLK

—0.025

—

µA

VEN =5V

Soft-Start Time

tSS

—3

—

TA, EN Low-to-High,

90% of VOUT

Thermal Shutdown

Die Temperature

TSD

—150

—

°C

Die Temperature Hysteresis

TSDHYS

—15

—

°C

TEMPERATURE SPECIFICATIONS

Electrical Specifications: Unless otherwise specified, all limits apply for typical values at ambient temperature

TA =+25°C, VIN = 3.3V, IOUT =20mA, VOUT =12V, CIN =COUT = 10 µF, X7R ceramic, L = 4.7 µH and 5-lead

SOT-23 package.

Boldface specifications apply over the controlled TA range of -40°C to +125°C.

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Temperature Ranges

Operating Junction Temperature

Range

-40

—

+125

°C

Steady State

Storage Temperature Range

-65

—

+150

°C

Maximum Junction Temperature

—

+150

°C

Transient

Package Thermal Resistances

Thermal Resistance, 5LD-SOT-23

JA

—

201.0

—

°C/W

Thermal Resistance, 8LD-2x3 TDFN

JA

—52.5

—

°C/W

DC AND AC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise specified, all limits apply for typical values at ambient temperature

TA =+25°C, VIN = 3.3V, IOUT =20mA, VOUT =12V, CIN =COUT = 10 µF, X7R ceramic, L = 4.7 µH.

Boldface specifications apply over the controlled TA range of -40°C to +125°C.

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Note 1:

Minimum input voltage in the range of VIN (VIN <5.5V < VOUT) depends on the maximum duty cycle

(DCMAX) and on the output voltage (VOUT), according to the boost converter equation:

VINmin =VOUT x(1– DCMAX).

IIN0 varies with input and output voltage (Figure 2-8). IIN0 is measured on the VIN pin when the device is

switching (EN = VIN), at no load, with RTOP = 120 k and RBOT =1.05 M.

IQSHDN is measured on the VIN pin when the device is not switching (EN = GND), at no load, with the

feedback resistors (RTOP +RBOT) disconnected from VOUT.

Determined by characterization, not production tested.

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