LTC3737EUF(RevA) 데이터 시트보기 (PDF) - Linear Technology

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LTC3737EUF
(Rev.:RevA)

Dual 2-Phase, No RSENSE™, DC/DC Controller with Output Tracking

Linear Technology 

LTC3737

ELECTRICAL CHARACTERISTICS The ● denotes specifications that apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise specified.

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Output Voltage Load Regulation

VFB1,2 Input Current

TRACK Input Current

ITH = 0.9V (Note 5)

ITH = 1.7V

(Note 5)

TRACK = 0.6V

0.12

0.5

%

–0.12 –0.5

%

10

50

nA

10

50

nA

Overvoltage Protect Threshold

Overvoltage Protect Hysteresis

Measured at VFB

0.66 0.68

0.7

V

20

mV

Gate Drive 1, 2 Rise Time

Gate Drive 1, 2 Fall Time

Maximum Current Sense Voltage (∆VSENSE(MAX))

(SENSE+ – SW)

Soft-Start Time

Oscillator and Phase-Locked Loop

CL = 3000pF

CL = 3000pF

IPRG = Floating (Note 6)

IPRG = 0V (Note 6)

IPRG = VIN (Note 6)

Time for VFB1 to Ramp from 0.05V to 0.55V

40

ns

40

ns

● 110

125

140

mV

● 70

85

100

mV

● 185

204

223

mV

0.667 0.833

1

ms

Oscilator Frequency

Phase-Locked Loop Lock Range

Unsynchronized (SYNC/MODE Not Clocked)

PLLLPF = Floating

PLLLPF = 0V

PLLLPF = VIN

SYNC/MODE Clocked

Minimum Synchronizable Frequency

Maximum Synchronizable Frequency

● 480

550

600

kHz

● 260

300

340

kHz

● 650

750

825

kHz

●

200 250

kHz

● 850 1150

kHz

Phase Detector Output Current

Sinking

Sourcing

PGOOD Output

fOSC > fSYNC/MODE

fOSC < fSYNC/MODE

–4

µA

4

µA

PGOOD Voltage Low

PGOOD Trip Level

IPGOOD Sinking 1mA

VFB with Respect to Set Output Voltage

VFB < 0.6V, Ramping Positive

VFB < 0.6V, Ramping Negative

VFB > 0.6V, Ramping Negative

VFB > 0.6V, Ramping Positive

125

mV

–13 –10.0 –7

%

–16 –13.3 –10

%

7

10.0

13

%

10

13.3

16

%

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LTC3737E is guaranteed to meet specified performance from

0°C to 70°C. Specifications over the –40°C to 85°C operating range are

assured by design, characterization and correlation with statistical process

controls.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • θJA°C/W)

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

delivered at the switching frequency.

Note 5: The LTC3737 is tested in a feedback loop that servos ITH to a

specified voltage and measures the resultant VFB voltage.

Note 6: Peak current sense voltage is reduced dependent on duty cycle to

a percentage of value as shown in Figure 2.

3737fa

3

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