S-8340A25AFT-T2-X Datasheet, PDF (29/55 Pages) Seiko Instruments Inc – SWITCHABLE SWITCHING REGULATOR CONTROLLER

STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.4.0_01
S-8340/8341 Series
S-8340A50A (fOSC : 600 kHz) / S-8340C50A (fOSC : 300 kHz)
5.04
5.02
25°C
85°C
5.00
4.98
4.96
4.94
4.92
Ta = −40°C
4.90
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VDD (V)
(11) Oscillation Start Voltage (VST) vs. Temperature (Ta) (12) Maximum Duty Ratio (MaxDuty) vs. Supply Voltage
(VDD)
S-8340A33A (fOSC : 600 kHz) / S-8340C33A (fOSC : 300 kHz)
1.0
0.9
0.8
S-8340A33A (fOSC : 600 kHz) / S-8340C33A (fOSC : 300 kH z)
85
84
83
25°C
85°C
0.7
82
0.6
0.5
0.4
−40 −20 0 20 40 60 80
Ta (°C)
81
80
Ta = −40°C
79
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VDD (V)
(13) PWM/PFM Switching Duty Ratio (PFMDuty) vs. Supply Voltage (VDD)
S-8341A33A (f_OSC : 600 kHz)
30
29
25°C
85°C
28
27
26
25
Ta = −40°C
24
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VDD (V)
S-8341C33A (f_OSC : 300 kHz )
24
23
25°C
22
85°C
21
20
19
Ta = −40°C
18
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VDD (V)
(14) Current Limit Detection Ratio (VSENSE) vs. Supply Voltage (VDD)
S-8340A33A (fOSC : 600 kHz ) / S-8340C33A (fOSC : 300 kHz)
135
130
25°C 85°C
125
120
115
110
Ta = −40°C
105
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VDD (V)
29