MC33998 データシートの表示（PDF） - Freescale Semiconductor
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MC33998 Datasheet PDF : 20 Pages
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TYPICAL APPLICATIONS
FUNCTIONAL PIN DESCRIPTION
TYPICAL APPLICATIONS
Cf1
10uF
Lf1
10uH
Cf2 C1
1.0uF 100uF
VPWR
4
C2
1.0uF
Dp1
Dp2
KA_VPWR
2
VREF1
Cs1 21
33nF
VREF2
Cs216
33nF
3 39 98
Drive
I-lim
Sof t
St art
E nb
Osc
Logic
&
Latch
Ramp
V bg
Retry
VRE F1
Reg.
B and ga p
Voltage
Vb g
Snsenb Reference
Retry
VRE F2
Reg.
S nse nb
Snsenb
E nab le
Control Enb
Enb
2 .6 V
Linear
Regulator
Driver
P OR
En b
V bg
2.6V
St and by
Reg.
Charge
Pump
PwrOK
Vka mO K
CRES 3
C9
22nF
SNSEN 22 EN 23
5-8 GND
17-20
V SW
9
D1
FBK B
11
V SUM
12
V DDH
15
L1
15uH
VDDH = 5.0V
@ 1400mA total
R3 C3
2.2R 68uF
C8
390pF
O ptio na l
S nu bb er
C4
100nF
Cc 1 Rc1
2.2nF 3.6k
DRV L
Q1
13
FBL
14
C5
10 0n F
V KAM
24
C7
4.7uF
P W ROK
10
VKA MO K
1
VDDL = 2.6V
@ 400mA
C6
68uF
VKAM = 2.6V
@ 10mA
R1 R2
10k 10k
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 10. 33998 Application Circuit Schematic Diagram
33998
16
Analog Integrated Circuit Device Data
Freescale Semiconductor
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