S-1701A2521-M5T1G Seiko Instruments, S-1701A2521-M5T1G Datasheet - Page 42

• Manufacturer Part Number: S-1701A2521-M5T1G
• Description: IC DETECT/REG 400MA 2.5V SOT23-5
• Manufacturer: Seiko Instruments

Specifications of S-1701A2521-M5T1G

• Applications: Converter, Battery Powered Devices
• Voltage - Input: 2 ~ 6.5 V
• Number Of Outputs: 1
• Voltage - Output: 2.5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

42
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
S-1701 Series
Detector block
1. Basic operation
Figure 36 shows a block diagram of the detector block.
(1) When the SENSE voltage (V
(2) When V
(3) When V
(4) V
(5) In the S-1701 Series, the detection voltage can be set within the range of 1.5 V to 5.5 V (operating voltage range:
(high) is output.
When the V
transistor N1 in Figure 36 becomes ON, and the comparator input voltage is changed to
becomes V
surpasses −V
Nch transistor becomes OFF and V
0.8 V to 6.5 V).
(R
SS
b
+R
R
is output when V
a
+R
c
) • V
SENSE
IN
b
+R
falls below the minimum operating voltage, the output becomes undefined. In this case the output
IN
Current
supply
SENSE
SENSE
c
*1. Parasitic diode
because it is pulled up.
DET
goes below +V
, as long as it does not exceed the release voltage +V
.
falls below −V
Since the Nch transistor N1 in Figure 36 is OFF, the comparator input voltage is
IN
rises above the minimum operating voltage. The V
V
V
SENSE
DET
V
IN
ref
SS
, V
DET
) is higher than the release voltage (+V
IN
R
R
R
IN
Figure 36 Block Diagram (Detector Block)
V
, the Nch transistor becomes ON and V
a
b
is output. V
c
SENSE
+
−
is output, as long as V
Seiko Instruments Inc.
N1
IN
at the VDOUT pin is delayed for t
Delay circuit
SENSE
remains above the detection voltage (−V
DET
Nch
DET
SS
. When V
), the Nch transistor is OFF and V
level still appears even when V
SS
is output. At this time, the Nch
D
SENSE
due to the delay circuit.
*1
R
b
R
rises above +V
• V
a
+R
SENSE
b
VDOUT
Rev.3.0
.
DET
SENSE
_00
, the
DET
IN
).