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1-1-2 Switching Mode Regulator ICs
SI-8205NHD Full-Mold, Separate Excitation Step-down Switching Mode Regulator ICs ICs Surface-Mount, Current Mode Control, Synchronous Rectifier Step-down Switching Mode Regulator
Features
* * * * * * * * *
Compact surface-mount (HSOP8) package Wide input voltage range (VIN): Vo + 3 to 43 V Synchronous rectifier mode Output current: 3 A Reference voltage and accuracy of 0.5 V 1% Oscillation frequency: 200 kHz to 1 MHz Output can be disabled Undervoltage Lock Out Soft start function
Absolute Maximum Ratings
Parameter Symbol Ratings Unit Conditions
Input Voltage (VIN Pin) Power Dissipation*1 Junction Temperature Storage Temperature Thermal Resistance (Junction to Lead <1 pin>) Thermal Resistance (Junction to Ambient Air)
VIN PD Tj Tstg j-c j-a
46 1.35 -40 to +150 -40 to +150 40 74
V W C C C/W C/W
When mounted on a 30 x 30 mm glass-epoxy board (with a 25 x 25 mm copper area)
When mounted on a 30 x 30 mm glass-epoxy board (with a 25 x 25 mm copper area)
Recommended Operating Conditions
Parameter
Applications
* * * *
Power supply for LCD module Power supply for notebook PC Onboard local power supplies Power supply for LBP/PPC
Input Voltage Range Output Current Range Output Voltage Range Operating Junction Temperature Range Operating Temperature Range
Ratings Vo+3 to 43 0 3.0 0.5 24 -40 to +125 -40 to +85
Unit V A V C C
Electrical Characteristics
Symbol Reference Voltage Temperature Coefficient of Reference Voltage Efficiency Oscillation Frequency 1 Oscillation Frequency 2 Line Regulation Load Regulation Overcurrent Protection Starting Current Quiescent Circuit Current Outflow Current at Low Voltage EN/SS Pin Open Voltage On Threshold Voltage OVP Start Voltage Thermal Protection Start Temperature Error Amplifier Voltage Gain Error Amplifier Transformer Conductance Current Sense Amplifier Impedance Maximum ON Duty Minimum ON Time Vref VREF/T
(Ta = 25C and fo = 500kHz unless otherwise specified)
min. 0.495
fo1 fo2 VoLINE VoLOAD Is IIN IIN(OFF) IEN/SS VSSH VC/EH Vovp Tj AEA GEA GCS DMAX DMIN
Ratings typ. 0.500 0.05 90 200 1 50 50 8
max. 0.505
Unit V mV/C % kHz MHz mV mV A mA
A A
Conditions VIN=12V, Io=1.0A VIN=12V, Io=1.0A, Ta=-40 to +85C VIN=12V, Vo=5V, Io=1.0A VIN=12V, Vo=5V, Io=1A, Rfset=375k VIN=12V, Vo=5V, Io=1A, Rfset=75k VIN=8 to 43V, Vo to 5V, Io=1A VIN=12V, Vo=5V, Io=0.1 to 3.0A VIN=12V, Vo=5V VIN=12V, Vcomp=0V VIN=12V, VEN/ss=0V VEN/SS=0V, VIN=12V VIN=12V VIN=12V
3.1
6.0 40
3.0 0.6 0.57 151
5 4.5 1.3 0.60 160 800 800 3.33 90 150
6.0 2.0 0.63
V V V
C
V/V /V A/V % nsec
VIN=12V VIN=12V
80
ICs
SI-8205NHD
External Dimensions (HSOP8)
(Unit : mm)
4.40
6.20
Pin 1 Mark
0.695 TYP 5.20 A
1.50
Enlarged View of A
1.27 0.40
(0.52)
0.4
Pin Assignment q w e r t y u i Plastic Mold Package Type Flammability : UL 94V-0 Product Mass : Approx. 0.1 g
0.050.05 0.15
2.90
0.30
(0.55)
Block Diagram
+ REG
2.20 2.70
(0.27)
0.30
0.080.08
CUR_SUS DRV_REG
REG_DRV REG REG OVC REG_DEV REG_DEV
-
REG
REG_BIAS STANDBY RegOK
STANDBY
OCP_CMP
VinOK
BC
H/S Drv
Level Shift
REG_UVLO
M1
VIN_UVLO
PWR_stage
REG VinOK REG REG VinOK Set PH Fere Off Phase
M2 GATE_logic
Level Shift LSoft STANDBY REG VinOK PH Open REG OVT
OSC_RAMP
Ramp FB
REG
Phase_ logic
INIT PH INIT CC
L/S Drv
Res PH
CUR_COMP
REG
LSoft
BS_CHG
Fere_Off Set PH RegOK VinOK REG_BIAS
Control_logic
OVT
TSD
BG REG
INIT OVP OVP
OVP_CMP
REG
SS_Ref
REG
BG
Ref
EN_SS
STANDBY
Err_AMP REF
Rnf SS_Rnf
Typical Connection Diagram
C1:10F/50Vx2
VIN 3 VIN EN/SS R5 C4 7 8 BS SW 6 R1
C2:22F/16Vx2
L1 VO
C3:270pF C4:10F
2 C1 4
SI-8205NHD
FSET GND 1 R4 FB COMP 5 C3 C6 Open R3
C2 GND
C5:1F L1:10H R1:9k R2:1k R3:51k R4:150k R5:20 to 47
C5 GND
R2 D1
ICs
81

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