33730_10 Datasheet, PDF (21/26 Pages) Freescale Semiconductor, Inc – Switch Mode Power Supply with Multiple Linear Regulators

TYPICAL APPLICATIONS
OPERATIONAL MODES
Optional
Protection FET
Battery
3.3uH
VB AT
10nF
1. 0uF
100uF
V BAT
KA _V BAT
1.0uF
10nF
1.0 V
V KAM
10nF
4.7uF _CP
PFD
RE GON
5. 1k
V IGN
I GN_ON
5.0 V
1.5R
1. 0uF
5.0 V
1. 5R
1.0uF
4 x 5.1k
VREF1
VREF2
P1
P2
P3
RS TKAM
RS TH
RST3
RS TL
UVLO
/OV LO
Feed
Forward
Ramp
Generator
VK AM
15 mA,ILim,
TLim
Prot ectio n
FE T
Drive
CP
Charge
Pump
Osc illator
CP
Buck
Control Logic
HS Drive,
Level
Sh if ter
SW
SW
FRE Q
B OOT
22uH
SS 26
SR ^RFreq
V_DV_DDHD=_H5.=0 5V.0V
@^@ 2²0⁰00m^mA^A(t¹o³t⁾al
100uF
V _BG
Feedback Compens ation Network
1200.4k k
15.908k k
INV
1. 5n F
20-60 k₂⁽₀¹_k⁴⁾
2.2nF
56pF
VCOMP 2.2-4.7 μF⁽¹⁴⁾
430R
Enable
5.0 V,
ILim=150 mA
2 6. 5V,-1V,TLim
T-lim
Standby
Control
5.0 V,
ILim=150 mA
26.5V,-1V,TLim
Ref. Voltage
Programming
B lo ck
Ba nd -G ap
Reference
V _BG
VKAM, VDDL, VDD3,
VDD3_ _{SB Y}
Ref. Voltage
VK _AM
Reset Detect
V _DDH
Reset Detect
VDD3
Reset Detect
V _DDL
Reset Detect
V DD3
IL _im, TLim
VDD3_SBY
IL _im, TLim
V DDL
I _Lim
VDDH
10nF
100nF
VDD3_B
V DD3
3.3 V Standby
4.7uF 10nF
VDDL_B
VDDL
Q1
1.5 V
10uF 10nF
HR Timer
HRT
RHRT
GND
Recommended Q1, Q2:
BCP68T1 (SOT-223)
NJD2873T4 (DPAK)
MJB44H11 (D2PAK)
Notes
13. The V_DDH total current includes the sum of all output currents of the IC.
14. Higher resistance (60 k) and higher capacitance (4.7μF) in the compensation network will reduce the V_DDH overshoot.
Compensation network values should be optimized for specific circuit applications.
Figure 9. 33730 Typical Application, VDD3 Standby Output @ 15 mA
Table 9. Programming Output Voltage (BOLD denotes selected combinations)'
P1
High
High
High
High
Low
Low
Low
Low
P2
High
High
Low
Low
High
High
Low
Low
P3
High
Low
High
Low
High
Low
High
Low
V_DD3
3.3V
3.3V
3.3V
3.3V
3.3 V Standby
2.0 V
2.6 V Standby
2.6 V Standby
V_DDL
2.6V
3.3V
1.5V
3.3V
3.3 V
3.15 V
3.3 V
3.3 V
V_KAM
2.6V
3.3V
1.0V
1.0V
1.0 V
5.0 V
1.0 V
1.5 V
Analog Integrated Circuit Device Data
Freescale Semiconductor
33730
21