LTC3548EDD-2(RevA) Просмотр технического описания (PDF) - Linear Technology

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LTC3548EDD-2
(Rev.:RevA)

Dual Synchronous, Fixed/Adjustable Output, 2.25MHz Step-Down DC/DC Regulator

Linear Technology 

LTC3548-2

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, unless otherwise specified. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

POR

Power-On Reset Threshold

Power-On Reset On-Resistance

VOUT1, VFB2 Ramping Down, MODE/SYNC = 0V

–8.5

%

100 200

Ω

Power-On Reset Delay

262,144

Cycles

VRUN

IRUN

RUN Threshold

RUN Leakage Current

● 0.3

1

1.5

V

●

0.01

1

µA

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3548-2 is guaranteed to meet specified performance from

0°C to 85°C. Specifications over the – 40°C and 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: The LTC3548-2 is tested in a proprietary test mode that connects

the output of the error amplifier with an outside servo loop.

Note 4: Dynamic supply current is higher due to the internal gate charge

being delivered at the switching frequency.

Note 5: TJ is calculated from the ambient TA and power dissipation PD

according to the following formula: TJ = TA + (PD • θJA).

Note 6: The DFN switch on-resistance is guaranteed by correlation to

wafer level measurements.

TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise specified.

Burst Mode Operation

Pulse Skipping Mode

Load Step

SW

5V/DIV

IL

200mA/DIV

VOUT

20mV/DIV

SW

5V/DIV

IL

200mA/DIV

VOUT

10mV/DIV

VOUT

200mV/DIV

IL

500mA/DIV

ILOAD

500mA/DIV

VIN = 3.6V

2µs/DIV

VOUT = 1.8V

ILOAD = 60mA

CHANNEL 1; CIRCUIT OF FIGURE 3

35482 G01

VIN = 3.6V

1µs/DIV

VOUT = 1.8V

ILOAD = 30mA

CHANNEL 1; CIRCUIT OF FIGURE 3

35482 G02

VIN = 3.6V

20µs/DIV

VOUT = 1.8V

ILOAD = 80mA TO 800mA

CHANNEL 1; CIRCUIT OF FIGURE 3

35482 G03

Efficiency vs Input Voltage

100

95

90

85 1mA

100mA

10mA

80 800mA

75

70

65

VOUT = 1.8V, CHANNEL 1

Burst Mode OPERATION

CIRCUIT OF FIGURE 3

60

2

3

4

5

INPUT VOLTAGE (V)

6

35482 G04

Oscillator Frequency

vs Temperature

2.5

VIN = 3.6V

2.4

2.3

2.2

2.1

2.0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

35482 G05

Oscillator Frequency

vs Input Voltage

10

8

6

4

2

0

–2

–4

–6

–8

–10

2

3

4

VIN (V)

5

6

35482 G06

35482fa

3

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