1-1-2 Switching Mode Regulator ICs
SI-8405NL
Surface-Mount, Synchronous Rectifier Step-down Switching Mode Regulator Control ICs
■Features
• Input voltage (Vin): 3.0 to 5.5 V
• Synchronous rectification
• Output voltage precision
±1.2%
• Oscillation Frequency: 250 kHz
• Overcurrent protection (Overcurrent value can
be set by the external resistor.)
• Output can be disabled
• Undervoltage Lock Out
• Soft start function
• High-speed load response
■Absolute
Maximum Ratings
Parameter
Input Voltage (V
IN
pin)
EN/SS Pin Input Voltage
Junction Temperature
Storage Temperature
Symbol
V
IN
V
EN
T
j
T
stg
Ratings
6
–0.3 to V
IN
+125
–40 to +150
Unit
V
V
°C
°C
■Recommended
Operating Conditions
Parameter
Input Voltage Range
Output Voltage Range
Operating Temperature Range
Symbol
V
IN
V
O
T
op
Ratings
3 to 5.5
0.5 to 4
–40 to +85
Unit
V
V
°C
■Applications
• Power supply for LCD modules
• Power supply for notebook PC
• Onboard local power supplies
• Power supply for LBP/PPC
■Electrical
Characteristics
Parameter
Reference Voltage
Circuit Current (V
IN
Pin)
Standby Current (V
IN
Pin)
On Time
High Side Drive Block ON Resistance (Pulled Up)
High Side Drive Block ON Resistance (Pulled Down)
Low Side Drive Block ON Resistance (Pulled Up)
Low Side Drive Block ON Resistance (Pulled Down)
Overcurrent Detection Voltage
EN/SS Pin Current
EN/SS Low Level Voltage
Symbol
V
ref
Conditions
I
op
Conditions
I
std
Conditions
T
on
Conditions
R
on
HH
Conditions
R
on
HL
Conditions
R
on
LH
Conditions
R
on
LL
Conditions
V
lim
Conditions
I
ss
Conditions
V
celo
Conditions
V
th(SS Start)
0.8
Conditions
V
th(ON)
Conditions
V
IN
=5V
2.9
2.4
V
uvloh
V
uvlol
0
V
IN
=5V
0.9
V
IN
=5V
2.4
1.0
7
40
Ratings
min.
0.494
typ.
0.500
V
IN
=5V, V
EN
=5V
5
V
IN
=5V, V
EN
=H
400
V
IN
=5V, V
EN
=L
2
V
IN
=5V, Vo=2.5V
3.5
V
IN
=5V, I
D
=0.1A
3.5
V
IN
=5V, I
D
=0.1A
3.5
V
IN
=5V, I
D
=0.1A
3.5
V
IN
=5V, I
D
=0.1A
50
V
IN
=5V
10
V
IN
=5V
0.8
13
60
600
max.
0.506
(T
a
=25°C)
Unit
V
mA
µA
µS
Ω
Ω
Ω
Ω
mV
µA
V
V
V
V
V
EN/SS Threshold Voltage
Undervoltage Lock Out (V
IN
)
80
ICs
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