LTC1874 datasheet(2/12 Pages) LINER

Part #	LTC1874

Description	Dual Constant Frequency Current Mode Step-Down DC/DC Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC1874

ABSOLUTE MAXIMUM RATINGS

(Note 1)

Input Supply Voltage (VIN, PVIN) ...............– 0.3V to 10V

SENSE –, PGATE Voltages ............. – 0.3V to (VIN + 0.3V)

VFB, ITH/RUN Voltages ..............................–0.3V to 2.4V

PGATE Peak Output Current (< 10

µs) ....................... 1A

Storage Ambient Temperature Range ... – 65

°C to 150°C

Operating Temperature Range (Note 2) .. – 40

°C to 85°C

Junction Temperature (Note 3) ............................. 150

°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

PACKAGE/ORDER INFORMATION

TJMAX = 150°C, θJA = 135°C/ W

GN PART MARKING

ORDER PART

NUMBER

LTC1874EGN

1874

Consult factory for parts specified with wider operating temperature ranges.

All specifications apply to each controller. The q denotes specifications that

apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise specified.

(Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input DC Supply Current (Per Controller)

Typicals at VIN = 4.2V (Note 4)

Normal Operation

2.4V

≤ VIN ≤ 9.8V

270

420

µA

Sleep Mode

2.4V

≤ VIN ≤ 9.8V

230

370

µA

Shutdown

2.4V

≤ VIN ≤ 9.8V, VITH/RUN = 0V

8

22

µA

UVLO

VIN < UVLO Threshold

6

10

µA

Undervoltage Lockout Threshold

VIN Falling

q

1.55

2.0

2.35

V

VIN Rising

1.85

2.3

2.40

V

Shutdown Threshold (at ITH/RUN)

q

0.15

0.35

0.55

V

Start-Up Current Source

VITH/RUN = 0V

0.25

0.5

0.85

µA

Regulated Feedback Voltage

TA = 0°C to 70°C (Note 5)

q

0.780

0.800

0.820

V

TA = – 40°C to 85°C (Note 5)

q

0.770

0.800

0.830

V

Output Voltage Line Regulation

2.4V

≤ VIN ≤ 9.8V (Note 5)

0.05

mV/V

Output Voltage Load Regulation

ITH/RUN Sinking 5µA (Note 5)

2.5

mV/

µA

ITH/RUN Sourcing 5µA (Note 5)

2.5

mV/

µA

VFB Input Current

(Note 5)

10

50

nA

Overvoltage Protect Threshold

Measured at VFB

0.820

0.860

0.895

V

Overvoltage Protect Hysteresis

20

mV

Oscillator Frequency

VFB = 0.8V

500

550

650

kHz

VFB = 0V

120

kHz

Gate Drive Rise Time

CLOAD = 3000pF

40

ns

Gate Drive Fall Time

CLOAD = 3000pF

40

ns

Peak Current Sense Voltage

(Note 6)

120

mV

1

2

3

4

5

6

7

8

TOP VIEW

GN PACKAGE

16-LEAD NARROW PLASTIC SSOP

16

15

14

13

12

11

10

9

VIN1

SENSE1–

GND1

VFB1

ITH/RUN2

PGND2

PGATE2

PVIN2

PVIN1

PGATE1

PGND1

ITH/RUN1

VFB2

GND2

SENSE2–

VIN2

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

Note 2: The LTC1874E is guaranteed to meet performance specifications

from 0

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

temperature 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 the gate charge being

delivered at the switching frequency.

Note 5: Each controller in the LTC1874 is individually tested in a feedback

loop that servos VFB to the output of the error amplifier.

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

to a percentage of value as given in Figure 2.

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