LTC1872BES6 查看數據表（PDF） - Linear Technology

零件编号

产品描述 (功能)

生产厂家

LTC1872BES6

Constant Frequency Current Mode Step-Up DC/DC Controller in ThinSOT

Linear Technology 

LTC1872B

ABSOLUTE MAXIMUM RATINGS

(Note 1)

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

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

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

NGATE Peak Output Current (< 10µs) ....................... 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

TOP VIEW

ITH/RUN 1

GND 2

VFB 3

6 NGATE

5 VIN

4 SENSE–

S6 PACKAGE

6-LEAD PLASTIC SOT-23

TJMAX = 150°C, θJA = 230°C/ W

ORDER PART

NUMBER

LTC1872BES6

S6 PART MARKING

LTXY

Consult LTC marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS 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

Normal Operation

Sleep Mode

Shutdown

UVLO

Undervoltage Lockout Threshold

Shutdown Threshold (at ITH/RUN)

Start-Up Current Source

Regulated Feedback Voltage

Typicals at VIN = 4.2V (Note 4)

2.4V ≤ VIN ≤ 9.8V

2.4V ≤ VIN ≤ 9.8V

2.4V ≤ VIN ≤ 9.8V, VITH/RUN = 0V

VIN < UVLO Threshold

VIN Falling

VIN Rising

VITH/RUN = 0V

0°C to 70°C(Note 5)

– 40°C to 85°C(Note 5)

270 420

µA

230 370

µA

8

22

µA

6

10

µA

q 1.55 2.00 2.35

V

1.85 2.10 2.40

V

q 0.15 0.35 0.55

V

0.25

0.5

0.85

µA

q 0.780 0.800 0.820

V

q 0.770 0.800 0.830

V

VFB Input Current

Oscillator Frequency

Gate Drive Rise Time

Gate Drive Fall Time

Peak Current Sense Voltage

(Note 5)

VFB = 0.8V

CLOAD = 3000pF

CLOAD = 3000pF

(Note 6)

10

50

nA

500 550 650

kHz

40

ns

40

ns

114 120

mV

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

of a device may be impaired.

Note 2: The LTC1872BE 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: The LTC1872B is tested in a feedback loop that servos VFB to the

output of the error amplifier.

Note 6: Guaranteed by design at duty cycle = 30%. Peak current sense

voltage is VREF/6.67 at duty cycle <40%, and decreases as duty cycle

increases due to slope compensation as shown in Figure 3.

2

Share Link: