FAN1577A Datasheet, PDF (5/15 Pages) Fairchild Semiconductor – Dual Synchronous DC/DC Controller

Electrical Characteristics
VCC=12V and TA= -40°C to +85°C unless otherwise noted.
Symbol
Parameter
Conditions
VCC UVLO
VCC_ON Turn-On Threshold
VCC Ramp-Up
VCC_HYS UVLO Hysteresis
VCC Ramp-Down
Oscillator
FOSC
FOSC,RT
Oscillator Frequency
Total Accuracy
RRT=OPEN
RRT=GND
20kΩ＜RRT
DON_MAX Maximum Duty Cycle
Error Amplifier
VREF
△VREF
Internal Reference Voltage
VCC=8V, VCC=15V, TA=25°C
VREF Temperature Coefficient⁽¹⁾ TA=-40~85^oC
AVOL
Open-Loop Voltage Gain
BW
Unity Gain Bandwidth
ISOURCE
ISINK
Output Source Current
Output Sink Current
IN1=IN2=0.6V
IN1=IN2=0.8V
VH RAMP_PEAK Peak of VRAMP
Gate Output=DON_MAX
V RAMP_VALLEY Valley of VRAMP
No Gate Output
Two-Stage Soft-Start
ISRC_1
ISRC_2
1^st Soft-Start Charge Current
2^nd Soft-Start Charge Current
VSS_TRANSITION Soft-Start Transition Point
VCLP＜VCLN, VSS_Transition＞VSS
VCLP＜VCLN, VSS_Transition＜VSS
ISOURCE_1st Transit to
ISOURCE_2nd
See Figure 6
ISINK
Soft-Start Discharge Current VCLP＞VCLN
Protections
IOCSET
TOT
OC Sink Current
Over-Temperature
VCC=12V
TOT_HYS Over-Temperature Hysteresis
VOVP
Over-Voltage Protection of IN VOVP/VIN
Output
IDH
High-Side Current Source
RDH
High-Side Sink Resistor
VBST - VCLN=12V, VDH -
VCLN=6V
VBST - VCLN=12V
IDL
Low-Side Current Source
VCC=12V, VDL =6V
RDL
Low-Side Sink Resistor
TDT
Dead Time⁽²⁾
VCC=12V
VCC=12V, DH & DL=1000pF
Total Operating Current
ICC_OP Operating Supply Current
VCC=12V, No Load
ICC_SBY Standby Current (Disabled)
SS1/ENB=SS2/ENB=0V
Notes:
1. Not tested in production; 30 pieces sampled.
2. When VDL falls less than 2V relative to VDH rising to 2V.
© 2010 Fairchild Semiconductor Corporation
FAN1577A • Rev. 1.0.0
5
Min. Typ. Max. Unit
9.5
10.0 10.5
V
1.5
2.0
2.5
V
55
61
67
KHZ
308
340 372
-10
10
%
85
90
95
%
0.693
60
250
2.45
1.05
0.700
0.03
77
3.5
80
400
2.80
1.20
0.707
100
600
3.15
1.35
V
MV/^OC
DB
MHZ
µA
µA
V
V
28
35
42
µA
13
16
19
µA
1.40 1.42 1.44
V
50
µA
90
120 150 µA
150
°C
20
°C
118
122 126
%
1.0
1.8
A
2.8
3.8
Ω
1.0
1.8
A
2.8
3.8
Ω
50
70
90
NS
3.3
4.3
5.3 MA
0.7
1.0 MA
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