S8340 datasheet(12/55 Pages) SII

12 / 55 page

STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

S-8340/8341 Series

Rev.4.0_01

External parts

Coil :

Sumida Corporation CD54 (10

μH)

Diode :

Matsushita Electronic Industrial Co., Ltd. MA735 (Schottky type)

Capacitor :

Nichicon Corporation F93 (16 V, 47

μF, tantalum type)

Transistor :

Sanyo Electric Co., Ltd. 2SD1628G

Base resistor (Rb) :

1.0 k

Base capacitor (Cb) : 2200 pF (ceramic type)

CVREF :

0.01

μF

CSS :

4700 pF

The VDD pin is connected to the VOUT pin.

The ON/OFF pin is connected to the VOUT pin unless otherwise specified.

Connect the SENSE pin to the VSS pin.

*1. VOUT(S) : Set output voltage value

VOUT(E) : Actual output voltage value : Output voltage value when IOUT

= VOUT(S)/50 Ω and VIN = VOUT(S) × 0.6.

*2. The change of output voltage with temperature [mV/

°C] is calculated from the following formula.

ΔVOUT

ΔTa • VOUT

[mV/

°C]

ΔVOUT

ΔTa

VOUT(S) [V]

[ppm/

°C] ÷ 1000

(Change of output voltage

(Set output voltage (Output voltage temperature

with temperature)

value)

coefficient)

Caution The S-8340/8341 Series steps up from VDD = 0.9 V. However, 2.5 V or more for VDD is recommended to

stabilize the output voltage and oscillation frequency. If VDD is taken from VIN or other power sources,

instead of VOUT, VDD should be 2.5 V or more. However, if VDD is not taken from VOUT, note that the output

voltage accuracy of

±2.0% is not guaranteed due to dependency of output voltage on VDD. In particular,

accuracy of output voltage is degraded significantly when the VDD voltage is 6.0 V or more. Therefore,

do not use this IC when the VDD voltage is 6.0 V or more. If VDD of 2.5 V or more is applied, increase

power supply so that VDD becomes 2.5 V or more within the soft-start time (6.0 ms).

S8340 Datasheet(PDF) 12 Page - Seiko Instruments Inc

S8340 Datasheet(HTML) 12 Page - Seiko Instruments Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

Datasheet Download

Link URL