33702 Datasheet, PDF (10/24 Pages) Motorola, Inc – 3.0 A Switch-Mode Power Supply with Linear Regulator

Freescale Semiconductor, Inc.
DYNAMIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions -40°C ≤ T_J ≤ 125°C unless otherwise noted. Input voltages V_IN1 = V_IN2 = 3.3 V using the typical
application circuit (see Figure 20) unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
BUCK CONVERTER
Duty Cycle Range (Normal Operation)
D
0
–
90
%
Switching Node SW Rise Time (Note 9)
I_LOAD = 3.0 A
t_RISE
ns
–
TBD
–
Switching Node SW Fall Time (Note 9)
I_LOAD = 3.0 A
t_FALL
ns
–
TBD
–
Maximum Deadtime (Note 9)
t_D
–
TBD
–
ns
Buck Control Loop Propagation Delay (Note 9)
t_PD
V_INV < 0.8 V to V_SW > 90% of High Level or V_INV > 0.8 V to V_SW < 10% of
Low Level
ns
–
50
–
Soft Start Duration (Power Sequencing Disabled, EN1 = 1, EN2 = 1)
t_SS
200
350
800
µs
Fault Condition Timeout
t_FAULT
–
10
–
ms
Retry Timer Cycle
t_Ret
–
100
–
ms
OSCILLATOR
Oscillator Default Frequency (Switching Frequency), FREQ Pin Open
f_OSC
270
300
330
kHz
Oscillator Frequency Range
f_OSC
200
400
kHz
Oscillator Frequency Accuracy
R_F = 100 kΩ
f_OSC
kHz
360
400
440
Oscillator Frequency Accuracy
R_F = 200 kΩ
f_OSC
kHz
180
200
220
Oscillator Output Signal Duty Cycle (Square Wave, 180° Out-of-Phase with the
D_OSC
%
Internal Suitable Oscillator)
–
50
–
Synchronization Pulse Minimum Duration
t_SYNC
300
–
–
ns
BOOST REGULATOR
Boost Regulator FET Maximum ON Time
t_ON
–
24
–
µs
Boost Regulator Control Loop Propagation Delay (Note 9)
t_{BST_PD}
–
50
–
ns
Boost Switching Node V_BD Rise Time (Note 9)
I_BST = 20 mA
t_{B_RISE}
–
ns
15
40
Boost Switching Node V_BD Fall Time (Note 9)
I_BST = 20 mA
t_{B_FALL}
–
ns
15
40
Notes
9. Design Information only. Not production tested.
33702
10
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