s-8425 Seiko Instruments Inc., s-8425 Datasheet - Page 20

• Manufacturer Part Number: s-8425
• Description: Battery Backup Switching Ic
• Manufacturer: Seiko Instruments Inc.

2. Load Transient Response Based on Output Current Fluctuation
VOUT pin
20
Output
current
BATTERY BACKUP SWITCHING IC
S-8425 Series
Output
current
The overshoot and undershoot are caused in the output voltage if the output current fluctuates between 10
μ A and 50 mA (V
is constant. Figure 20 shows the output voltage variation due to the output current. Figure 21 shows the
test circuit for reference.
dependency.
Figures 22 to 24 show the ringing waveforms at the VOUT, VRO, and VCH pins due to the load variation.
Output voltage
Output current
Figure 20 Output Voltage Variation
(50 mV/div)
50 mA
due to Output Current
RO
Figure 22 Ringing Waveform due to Load Variation (VOUT Pin)
50 mA
is between 10 μ A and 30 mA, V
10 μ A
10 μ A
t (500 ms/div)
Overshoot
The latter half of this section describes ringing waveform and parameter
Undershoot
Seiko Instruments Inc.
CH
is between 10 μ A and 10 mA) while the input voltage
VIN
S-8425 Series
V
IN
VSS
= 6.0 V, C
10 μ A
Figure 21 Test Circuit
50 mA
VOUT
OUT
t (50 μ s/div)
= 22 μ F, Ta = 25 ° C
C
OUT
Rev.2.3
Oscillo-
scope
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