MC33998D データシートの表示（PDF） - Freescale Semiconductor
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MC33998D Datasheet PDF : 20 Pages
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Freescale Semiconductor, Inc.
APPLICATIONS
Cf1
10 uF
Lf1
10uH
Cf 2 C1
1.0uF 100uF
VPW R
4
C2
1.0uF
Dp1
Dp 2
KA _V PWR
2
VR EF1
Cs1 21
33 nF
VR EF2
16
C s2
33nF
3 399 8
D ri ve
I-lim
Soft
St art
Enb
O sc
Logic
&
Latc h
Ramp
Vbg
R etr y
VREF 1
Re g.
Ba ndgap Vb g
Vol ta g e
Snsenb Referen ce
R etr y
VREF 2
Re g.
Snsenb
Sns enb
Enable
Control En b
Enb
2. 6V
Linear
Regulat or
D r ive r
P OR
E nb
Vbg
2.6V
St and by
Reg .
Ch arge
P um p
PwrO K
VkamO K
CRES 3
C9
22n F
SNSEN 22 EN 23
5-8 G ND
17 -20
VSW
9
D1
FBKB
11
VSUM
12
VD DH
15
L1
15uH
VDDH = 5.0V
@ 1400mA total
R3
C3
2 .2 R 68uF
C8
390 pF
O pt io nal
Snubber
C4
100nF
Cc1 Rc1
2.2nF 3.6k
DR VL
Q1
13
FB L
14
C5
1 00n F
VDDL = 2. 6V
@ 40 0mA
C6
68uF
VKAM
24
VKAM = 2.6V
@ 10mA
C7
4 .7 uF
R1
1 0k
R2
10k
PW ROK
10
VKAMOK
1
Note The VDDH total output current is 1.4 A. This includes the current used by the linear regulator VDDL and buffered outputs VREF1 and VREF2.
Figure 8. 33998 Application Circuit Schematic Diagram
Table 1. Recommended Components
Designator
Cf1
Cf2, C2
C1
C3 (Note 15)
C6
C7
C4, C5
C8 (Optional)
C9
Value / Rating
10 µF/50 V
1.0 µF/50 V
100 µF/50 V
68 µF/10 V
68 µF/10 V
4.7 µF/10 V
100 nF/16 V
390 pF/50 V
22 nF/25 V
Description/Part No.
Aluminum Electrolytic/UUB1H100MNR
Ceramic X7R/C1812C105K5RACTR
Aluminum Electrolytic/UUH1V101MNR
Tantalum / T494D686M010AS
Tantalum / T494D686M010AS
Tantalum / T494A475M010AS
Ceramic X7R
Ceramic X7R
Ceramic X7R
Manufacturer (Note 16)
Nichicon
Kemet
Nichicon
Kemet
Kemet
Kemet
Any Manufacturer
Any Manufacturer
Any Manufacturer
Notes
15. It is possible to use ceramic capacitors in the switcher output, e.g. C3 = 2 x 22 µF/6.3 V X7R ceramic. In this case the compensation resistor
has to be changed to Rc1 = 200 Ω to stabilize the switching regulator operation.
16. Motorola does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or
tables. While Motorola offers component recommendations in this configuration, it is the customer’s responsibility to validate their application.
MOTOROLA ANALOG INTEGRATED CIRFCoUIrTMDEoVrICeEIDnAfoTArmation On This Product,
Go to: www.freescale.com
33998
15
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