L6997STR datasheet(15/30 Pages) STMICROELECTRONICS

Part #	L6997STR

Description	STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS

PDF	30 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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15 / 30 page

15/30

L6997S

Notes: 1. N.M.=Not Mounted

2. The demoboard with this component list is set to give: VOUT = 1.25V, FSW = 270kHz with an input voltage around VIN = VCC =

3.3V-5V and with the integrator feature.

3. The diode efficiency impact is very low; it is not a necessary component.

4. All capacitors are intended ceramic type otherwise specified.

5.4 EFFICIENCY CURVES

Source mode

VIN = 3.3V VOUT = 1.25V FSW = 270kHz

Figure 15. Efficiency vs output current

Part name

Value

Dimension

Notes

OUTPUT CAPACITORS

C14, C15

220µF

2R5TPE220M

POSCAP

INDUCTOR

2.7 µH

DO3316P-272HC

COILCRAFT

POWER MOS

Q1,Q2

STS5DNF20V

STMicroelectronics

Double mosfet in sigle package

DIODE

STPS340U

STMicroelectronics

Table 9. Component list (continued)

The component list is shared in two sections: the first for the general-purpose component, the second for

power section:

0,0

10,0

20,0

30,0

40,0

50,0

60,0

70,0

80,0

90,0

100,0

0,0

1,0

2,0

3,0

4,0

5,0

6,0

Current [A]

Eff [%]

PFM mode

PWM mode

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