mc33998 Freescale Semiconductor, Inc, mc33998 Datasheet - Page 16

• Manufacturer Part Number: mc33998
• Description: Switching Power Supply With Linear Regulators
• Manufacturer: Freescale Semiconductor, Inc

16
33998
TYPICAL APPLICATIONS
FUNCTIONAL PIN DESCRIPTION
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.
10uF
Dp1
Cf1
Dp2
1.0uF
Cf2
10uH
Lf1
100uF
C1
KA_VPWR
33nF
VREF1
Cs1
VREF2
VPWR
33nF
Cs2
1.0uF
C2
21
16
4
2
Figure 10. 33998 Application Circuit Schematic Diagram
CRES
Start
Charge
V REF1
V REF2
Osc
Soft
Pump
I-lim
Retry
Retry
Reg.
Reg.
TYPICAL APPLICATIONS
3
C9
22nF
Enb
Snsenb
Snsenb
SNSEN
Logic
Latch
Reference
&
Bandgap
Voltage
Enable
Control Enb
22
EN
33998
Snsenb
V bg
23
Drive
PwrOK
Ramp
POR
Enb
Enb
V bg
V bg
VkamOK
17-20
5-8
Regulator
Linear
Driver
Standby
2.6V
2.6V
Reg.
Analog Integrated Circuit Device Data
GND
VSW
VDDH
FBL
VKAM
PWROK
1
FBKB
VSUM
12
DRVL
13
14
24
10
VKAMOK
15
11
9
D1
Freescale Semiconductor
100nF
C5
Optional
Snubber
2.2nF
Cc 1
4.7uF
Q1
15uH
2.2R
C7
R3
C8
L1
390pF
3.6k
Rc1
68uF
68uF
10k
C3
C6
R1
V DDL = 2.6V
@ 1400mA total
@ 400mA
V DDH = 5.0V
10k
R2
V KAM = 2.6V
100nF
C4
@ 10mA