IR3897 IRF [International Rectifier], IR3897 Datasheet - Page 6

• Manufacturer Part Number: IR3897
• Description: 4A HIGHLY INTEGRATED SUPLRBUCK
• Manufacturer: IRF [International Rectifier]

ELECTRICAL SPECIFICATIONS
RECOMMENDED OPERATING CONDITIONS FOR RELIABLE OPERATION WITH MARGIN
*Maximum SW voltage should not exceed 25V.
**For internally biased single rail operation.
*** Vcc/LDO_Out can be connected to an external regulated supply. If so, the Vin input should be connected to Vcc/LDO_Out pin.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over, 6.8V < Vin = PVin < 21V, Vref = 0.5V in 0°C < T
Typical values are specified at T
Input Voltage Range*
Input Voltage Range**
Supply Voltage Range***
Supply Voltage Range
Output Voltage Range
Output Current Range
Switching Frequency
Operating Junction Temperature
Power Stage
Supply Current
Vcc/ LDO_Out
Power Losses
Top Switch
Bottom Switch
Bootstrap Diode Forward Voltage
SW Leakage Current
Dead Band Time
VIN Supply Current (standby)
VIN Supply Current (dynamic)
Output Voltage
LDO Dropout Voltage
Short Circuit Current
Zero‐crossing Comparator Delay
PARAMETER
6
AUGUST 08, 2012 |DATA SHEET | Rev 3.3
a
= 25°C.
Single‐Input Voltage, Synchronous Buck Regulator
SYMBOL
R
R
I
Tdly_zc
in(Standby)
V
ds(on)_Top
ds(on)_Bot
Ishort
I
P
in(Dyn)
cc_drop
I
T
V
LOSS
SW
db
cc
- 6 -
Vin
Fs = 600kHz, L = 1.5uH,
Vcc = 6.4V, Note 4
VBoot‐Vsw=6.4V,I
Vcc = 6.4V, I
I(Boot) = 10mA
SW = 0V, Enable = 0V
SW = 0V, Enable = high,
Vp = 0V
Note 4
EN = Low, No Switching
EN = High, Fs = 600kHz,
Vin = PVin = 21V
Vin(min) = 6.8V, Icc = 0‐30mA,
Cload = 2.2uF, DCM = 0
Vin(min) = 6.8V, Icc = 0‐30mA,
Cload = 2.2uF, DCM = 1
Icc=30mA,Cload=2.2uF
Note 4
4A Highly Integrated SupIRBuck
= 12V, V
CONDITIONS
Boot to SW
O
O
SYMBOL
= 1.2V, I
= 4A, Tj = 25°C
PVin
Vin
V
V
F
I
T
CC
O
O
S
J
O
= 4A,Tj = 25°C
O
= 4A,
MIN
300
‐40
1.0
6.8
4.5
4.5
0.5
0
MIN
180
6.0
4.0
5
TM
0.86xVin
256/Fs
MAX
17.5
17.9
1500
TYP
260
0.5
9.5
6.4
4.4
125
10
70
7.5
7.5
21
21
±4
J
< 125°C.
IR3897
MAX
22.5
23.3
12.5
470
100
6.7
4.8
0.7
30
1
PD‐97663
UNITS
kHz
°C
V
A
UNIT
mΩ
mV
mA
mA
µA
µA
ns
W
V
V
s