L6997D datasheet(15/23 Pages) STMICROELECTRONICS

部件名	L6997D

功能描述	STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS

PDF	23 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

15 / 23 page

15/23

L6997

POWER SECTION

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.

2.4 EFFICIENCY CURVES

Source mode

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

Figure 12. Efficiency vs output current

INPUT CAPACITORS

C7, C13

µF

ECJ4XF0J476Z

PANASONIC

OUTPUT CAPACITORS

C14, C15

220

µF

2R5TPE220M

POSCAP

INDUCTOR

2.7

µH

DO3316P-272HC

COILCRAFT

POWER MOS

Q1,Q2

STS5DNF20V

STMicroelectronics

Double mosfet in sigle package

DIODE

STPS340U

STMicroelectronics

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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