IR3897 Datasheet, PDF (7/45 Pages) International Rectifier – 4A HIGHLY INTEGRATED SUPLRBUCK

4A Highly Integrated SupIRBuck^TM
Single‐Input Vo_- l₇ta_-ge, Synchronous Buck Regulator
PD‐97663
IR3897
PARAMETER
Zero‐crossing Comparator Offset
Oscillator
Rt Voltage
Frequency Range
Ramp Amplitude
Ramp Offset
Min Pulse Width
Max Duty Cycle
Fixed Off Time
Sync Frequency Range
Sync Pulse Duration
Sync Level Threshold
Error Amplifier
Input Offset Voltage
Input Bias Current
Input Bias Current
Sink Current
Source Current
Slew Rate
Gain‐Bandwidth Product
DC Gain
Maximum output Voltage
Minimum output Voltage
Common Mode input Voltage
Reference Voltage
Feedback Voltage
Accuracy
SYMBOL
Vos_zc
CONDITIONS
Note 4
MIN TYP MAX UNIT
‐4
0
4
mV
Vrt
F_s
Vramp
Ramp(os)
Tmin(ctrl)
Dmax
Toff
Fsync
Tsync
High
Low
Rt = 80.6K
Rt = 39.2K
Rt = 15.0K
Vin = 7.0V, Vin slew rate max =
1V/µs, Note 4
Vin = 12V, Vin slew rate max =
1V/µs, Note 4
Vin = 21V, Vin slew rate max =
1V/µs, Note 4
Vin=Vcc=5V, For external Vcc
operation, Note 4
Note 4
Note 4
Fs = 300kHz, PVin = Vin = 12V
Note 4
1.0
V
270 300 330
540 600 660
kHz
1350 1500 1650
1.05
1.80
Vp‐p
3.15
0.75
0.16
V
60
ns
86
%
200 250
ns
270
1650 kHz
100 200
ns
3
V
0.6
Vos_Vref
Vos_Vp
IFb(E/A)
IVp(E/A)
Isink(E/A)
Isource(E/A)
SR
GBWP
Gain
Vmax(E/A)
Vmin(E/A)
VFb – Vref, Vref = 0.5V
VFb – Vp, Vp = 0.5V
Note 4
Note 4
Note 4
‐1.5
+1.5
%
‐1.5
+1.5
‐1
+1
µA
0
+4
0.4
0.85
1.2
mA
4
7.5
11
mA
7
12
20
V/µs
20
30
40
MHz
100
110
120
dB
1.7
2.0
2.3
V
100
mV
0
1.2
V
Vfb
Vref and Vp pin floating
0°C < Tj < +70°C
‐40°C < Tj < +125°C, Note 3
0.5
V
‐0.5
+0.5
%
‐1.0
+1.0
7 AUGUST 08, 2012 |DATA SHEET | Rev 3.3