SI-8011NVS Datasheet, PDF (1/2 Pages) Sanken electric – Surface-Mount Synchronous Rectifier Step-down Switching Mode Regulator Control ICs

1-1-2 Switching Mode Regulator ICs
SI-8011NVS Surface-Mount, Synchronous Rectifier Step-down Switching Mode Regulator Control ICs
■Features
• Surface-mount package (TSSOP24)
• High efficiency due to synchronous rectifica-
tion: 93% (at VIN = 5V, IO = 1A, VO = 2.5V)
• Capable of downsize a choke-coil due to IC's
high switching frequency (125kHz typ, On
Time Control). (Compared with conventional
Sanken devices)
• Low reference voltage (Vref) of 1.1V. The
output voltage is variable from 1.1V to 6V.
• High-speed response to a load
• Compatible with low ESR capacitors
• Soft start and output ON/OFF available
• Built-in overcurrent protection circuit
• PWRGD function to indicate the output voltage
status
• High precision reference voltage: 1.1V ± 1.2%
■Absolute Maximum Ratings
Parameter
Control-System DC Input Voltage
DC Input Voltage
Boost Block Input Voltage
EN Terminal Input Voltage
PWRGD Terminal Applied Voltage
Junction Temperature
Storage Temperature
Symbol
VCC
VIN
VH
VEN
VPWRGD
Tj
Tstg
Ratings
7
25
30
VCC
7
+150
–40 to +150
(Ta=25°C)
Unit
V
V
V
V
V
°C
°C
■Applications
• Power supplies for notebook PCs and mobile devices
• Onboard local power supplies
• OA equipment
• For stabilization of the secondary-side output voltage of switching power supplies
■Recommended Operating Conditions
Parameter
Symbol
Ratings
Unit
Control System Input Voltage Range
VCC
4.5 to 5.5
V
Input Voltage Range
VIN
3 to 18
V
Output Voltage Range
VO
1.1 to 6
V
Operating Temperature Range
Top
–20 to +85
°C
■Electrical Characteristics
Parameter
Dynamic
Output Voltage
Characteristics Temperature Coefficient of Output Voltage
Circuit Current (VCC Terminal)
Circuit
Circuit Current (VIN Terminal)
Current
Standby Current 1 (VCC Terminal)
Standby Current 2 (VIN Terminal)
Undervoltage UVLO Operating Voltage 1 (VCC Terminal)
Lockout
UVLO Operating Voltage 2 (VIN Terminal)
On Time
On Time
Minimum Off Time
Control
REF Terminal Voltage
REF Terminal Source Current
High Side
Drive
On Resistance (high side)
On Resistance (low side)
Low Side
Drive
On Resistance (high side)
On Resistance (low side)
Bootstrap Bootstrap Voltage
Current for Current Limit Detection
Soft Start Terminal Current
EN Low Level Voltage
EN High Level Voltage
Protection EN Bias Level Current
System
PWRGD Good Voltage (high side)
PWRGD Good Voltage (low side)
PWRGD Low Output Voltage
PWRGD Terminal Current
PWRGD Leakage Current
Symbol
VO
∆VO/∆T
Iop
Iop
Istd1
Istd2
Vuvlo1
Vuvlo2
Ton
Toff
Vref
Iref
RonHH
RonHL
RonLH
RonLL
VH-VLIN
Ilim
Iss
Vcelo
Vcehi
ICE
Vsens
Vsens
Vpwrgd
Ipwrgd
Ipwrgd
min.
–1.2%
3.7
2.5
1.1
4.5
90
0
2.4
Ratings
typ.
1.1
±0.03
2
1
1.2
5.5
5.5
5.5
5.5
5
100
±20
1.32
0.88
max.
+1.2%
6
1
100
50
4.4
2.9
1.3
100
5.5
110
0.8
VCC
5
0.4
120
5
Unit
V
mV/°C
mA
mA
µA
µA
V
V
µS
µS
V
µA
Ω
Ω
Ω
Ω
V
µA
µA
V
V
µA
V
V
V
µA
µA
(Ta = 25°C unless otherwise specified)
Conditions
VIN=5V, VCC=5V, VSNS connected to VO, IO=0A
VIN=5V, VCC=5V, VSNS connected to VO, IO=0A, Ta=0 to 85°C
VCC=5V, EN=H, FADJ:open
VIN=5V, EN=H
VCC=5V, EN=L
VIN=5V, EN=L
VIN=5V
VCC=5V
VCC=5V, VIN=5V, VO=2.5V
VCC=5V
VCC=5V
VCC=5V
VH-VLIN=5V
VH-VLIN=5V
VCC=5V
VCC=5V
VCC=5V, VIN=5V
VCC=5V
VCC=5V
VCC=5V
VCC=5V, EN=5V
VCC=5V
VCC=5V
VCC=5V, Ipwrgd=120µA
VCC=5V, Vpwrgd=0.4V
Vpwrgd=5V
78 ICs