SI-8405NH Datasheet, PDF (1/2 Pages) Allegro MicroSystems – Surface-Mount, Synchronous Rectifier Step-down Switching Mode Regulator Control ICs

1-1-2 Switching Mode Regulator ICs
SI-8405NH 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: 750 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
■Applications
• Power supply for LCD modules
• Power supply for notebook PC
• Onboard local power supplies
• Power supply for LBP/PPC
■Absolute Maximum Ratings
Parameter
Input Voltage (VIN pin)
EN/SS Pin Input Voltage
Junction Temperature
Storage Temperature
Symbol
VIN
VEN
Tj
Tstg
Ratings
6
–0.3 to VIN
+125
–40 to +150
■Recommended Operating Conditions
Parameter
Input Voltage Range
Output Voltage Range
Operating Temperature Range
Symbol
VIN
Vo
Top
Ratings
3 to 5.5
0.5 to 4
–30 to +85
■Electrical Characteristics
Parameter
Reference Voltage
Circuit Current (VIN Pin)
Standby Current (VIN 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
EN/SS Threshold Voltage
Undervoltage Lock Out (VIN)
Symbol
Vref
Conditions
Iop
Conditions
Istd
Conditions
Ton
Conditions
RonHH
Conditions
RonHL
Conditions
RonLH
Conditions
RonLL
Conditions
Vlim
Conditions
Iss
Conditions
Vcelo
Conditions
Vth (SS Start)
Conditions
Vth (ON)
Conditions
Vuvloh
Vuvlol
min.
0.494
40
7
0
0.8
2.4
Ratings
typ.
0.500
VIN=5V, VEN=5V
5
VIN=5V, VEN=H
400
VIN=5V, VEN=L
0.65
VIN=5V, Vo=2.5V
3.5
VIN=5V, ID=0.1A
3.5
VIN=5V, ID=0.1A
3.5
VIN=5V, ID=0.1A
3.5
VIN=5V, ID=0.1A
50
VIN=5V
10
VIN=5V
VIN=5V
0.9
VIN=5V
VIN=5V
max.
0.506
600
60
13
0.8
1.0
2.4
2.9
Unit
V
V
°C
°C
Unit
V
V
°C
(Ta=25°C)
Unit
V
mA
µA
µS
Ω
Ω
Ω
Ω
mV
µA
V
V
V
V
V
84 ICs