AN8049SH
Voltage Regulators
I Terminal Equivalent Circuits (continued)
Pin No.
Equivalent circuit
Description
I/O
7
CTL1:
I
Controls the on/off state of channel 1. A delay
can be provided in the power supply turn-on start
VCC
time by connecting a capacitor between this pin
20 kΩ 1.1 µA
High
Channel 1
1.26 V output operation
and ground.
(See the "Application Notes, [9]" section.)
tDLY3 = 1.26 (V) × CCTL1 (µF)/1.1 (µA) (s)
This pin can also be used to control the on/off
state with an external signal. In that case, the
7
allowable input voltage range is from 0 V to VCC.
Note that during U.V.L.O. and timer latch
operation, this pin is connected to ground through
a 20 kΩ resistor.
8
Off:
I
100 kΩ
8
Start and stop of
internal circuits.
Controls the on/off state.
When the input is high: normal operation
(VOFF > 1.2 V)
When the input is low: standby mode
(VOFF < 0.6 V)
In standby mode, the total current consumption
is held to under 1 µA.
9
VREF:
O
VCC
Outputs the internal reference voltage.
The reference voltage is 1.26 V (allowance:
±1%) when VCC is 2.4 V and IREF is − 0.1 mA.
9
Insert a capacitor of at least 0.1 µF between VREF
and ground for phase compensation.
10
16
RB2:
I
Connection for a resistor that sets the channel 2
output current.
Use a resistor in the range 750 Ω to 15 kΩ.
ISO(OUT)2
200 Ω
10
ISI(OUT)2
13
30 kΩ
11
16
RB1:
I
Connection for a resistor that sets the channel 1
output current.
Use a resistor in the range 750 Ω to 15 kΩ.
ISO(OUT)1
200 Ω
11
ISI(OUT)1
12
30 kΩ
8