Datasheet

Analog Integrated Circuit Device Data
59 Freescale Semiconductor
MC34708
Functional Block Description
t
ON-SW4
Turn-on Time
• Enable to 90% of end value IL = 0
- - 500
µs
f
SW4
Switching Frequency
• PLLX = 0
• PLLX = 1
-
-
2.0
4.0
-
-
MHz
I
SW4Q
Quiescent Current Consumption
• APS MODE, IL = 0 mA; High output voltage range (V
SW4x
= 3.15 V
or 2.5
V) device not switching
• APS MODE, IL = 0 mA; Low output voltage range (V
SW4x
= 1.3 V).
device not switching
• PFM MODE, IL = 0 mA; device not switching
-
-
-
500
260
15
-
-
-
µA

SW4
Efficiency
•PFM, 3.15 V, 10 mA (A)
• PWM, 3.15 V, 50 mA (A)
• PWM, 3.15 V, 250 mA (A)
• PWM, 3.15 V, 500 mA (A)
•PFM, 1.2 V, 10 mA (B)
•PWM, 1.2 V, 50 mA (B)
•PWM, 1.2 V, 250 mA (B)
•PWM 1.2 V, 500 mA (B)
-
-
-
-
-
-
-
-
79
93
92
82
72
71
81
78
-
-
-
-
-
-
-
-
%
(54)
Notes:
52. Transient loading for load steps of IL
MAX
/ 2.
53. When SW4A/B is set to 3.0 V and above the regulator may drop out of regulation when BP nears the output voltage.
54. Efficiency numbers at V
IN
= 3.6 V, excludes the quiescent current.
Table 46. SW4A/B Electrical Specifications
Characteristics noted under conditions BP = 3.6 V, V
BUS
= 5.0 V, - 40 C  T
A
 85 C, unless otherwise noted. Typical values
at BP = 3.6 V and T
A
= 25 °C under nominal conditions, unless otherwise noted.
Symbol Characteristic Min Typ Max Unit Notes