LTC6900CS5 datasheet(11/12 Pages) LINER

11 / 12 page

LTC6900

6900f

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

S5 Package

5-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1635)

PACKAGE DESCRIPTIO

Table 2. Variation of VRES for Various Values of RIN || RSET

RIN || RSET (VIN = V

+)VRES, V+ = 3V

VRES, V

+ = 5V

20k

0.98V

1.03V

40k

1.03V

1.08V

80k

1.07V

1.12V

160k

1.1V

1.15V

320k

1.12V

1.17V

VRES = Voltage across RSET

Note: All of the calculations above assume VRES = 1.1V, although VRES ≈ 1.1V. For completeness,

Table 2 shows the variation of VRES against various parallel combinations of RIN and RSET

(VIN = V+). Calulate first with VRES ≈ 1.1V, then use Table 2 to get a better approximation of VRES,

then recalculate the resistor values using the new value for VRES.

Example 3:

V+ = 3V, fOSC(MAX) = 5MHz, fOSC(MIN) = 4MHz, N = 1

VIN(MAX) = 2.5V, VIN(MIN) = 0.5V

RIN/RSET = 8.5, RSET = 43.2k, RIN = 365k

Maximum modulation bandwidth is the lesser of 25kHz or

fOSC(MIN)/20 (4MHz/20 = 200kHz)

Maximum VIN modulation frequency = 25kHz

Example 4:

V+ = 3V, fOSC(MAX) = 400kHz, fOSC(MIN) = 200kHz, N = 10

VIN(MAX) = 2.5V, VIN(MIN) = 0.5V

RIN/RSET = 3.1, RSET = 59k, RIN = 182k

APPLICATIO S I FOR ATIO

1.50 – 1.75

(NOTE 4)

2.80 BSC

0.30 – 0.45 TYP

5 PLCS (NOTE 3)

DATUM ‘A’

0.09 – 0.20

(NOTE 3)

S5 TSOT-23 0302

PIN ONE

2.90 BSC

(NOTE 4)

0.95 BSC

1.90 BSC

0.80 – 0.90

1.00 MAX

0.01 – 0.10

0.20 BSC

0.30 – 0.50 REF

NOTE:

1. DIMENSIONS ARE IN MILLIMETERS

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. JEDEC PACKAGE REFERENCE IS MO-193

3.85 MAX

0.62

MAX

0.95

REF

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

1.4 MIN

2.62 REF

1.22 REF

Maximum modulation bandwidth is the lesser of 25kHz or

fOSC(MIN)/20 calculated at N =1 (2MHz/20 = 100kHz)

Maximum VIN modulation frequency = 25kHz

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