en5311 Enpirion, en5311 Datasheet - Page 5

• Manufacturer Part Number: en5311
• Description: 1a Synchronous Buck Regulator With Integrated Inductor
• Manufacturer: Enpirion

March 2008
Electrical Characteristics
NOTE: T
NOTE: V
† Parameter guaranteed by design.
©Enpirion 2008 all rights reserved, E&OE
Operating Input Voltage
Under Voltage Lockout
UVLO Hysteresis
V
V
Causes
Feedback Pin Voltage
Feedback Pin Voltage
Feedback Pin Input Current
Dynamic Voltage Slew
Rate
Output Current
Shut-Down Current
Quiescent Current
PFET OCP Threshold
VS0-VS1 Thresholds
VS0-VS2 Pin Input Current
Enable Voltage Threshold
Enable Pin Input Current
Operating Frequency
PFET On Resistance
NFET On Resistance
Typical inductor DCR
Soft-Start Operation
V
OUT
OUT
OUT
†
Initial Accuracy
Variation for all
Soft Start Slew Rate
PARAMETER
IN
A
= 25°C unless otherwise noted. Typical values are at VIN = 3.6V, C
must be greater than V
†
SYMBOL
R
R
V
OUT
V
V
V
F
I
I
DS(ON)
DS(ON)
V
V
V
I
V
UVLO
I
OUT
I
I
VSX
LIM
OSC
OUT
OUT
slew
SD
EN
FB
FB
FB
TH
IN
+ 0.6V.
VIN going low to high
2.4V ≤ V
T
2.4V ≤ V
T
2.4V ≤ V
TA = 25C; VSO=VS1=VS2=1
2.4V ≤ V
T
VSO=VS1=VS2=1
Enable = Low
No switching
2.4V ≤ V
0.6V ≤ V
Pin = Low
Pin = High
Logic Low
Logic High
V
goes high and V
V
A
A
A
IN
OUT
= 25C
= -40°C to +85°C
= -40°C to +85°C;
= 3.6V
rise begins when ENABLE
TEST CONDITIONS
IN
IN
IN
IN
IN
OUT
≤ 5.5V, I
≤ 5.5V, I
≤ 5.5V, I
≤ 5.5V, I
≤ 5.5V,
≤ V
IN
5
IN
– 0.6V
> V
LOAD
LOAD
LOAD
LOAD
UVLO
= 100mA;
= 0 - 1A,
= 100mA
= 0 - 1A,
IN
= 4.7µF, C
0.591
0.585
1000
1.24
1.24
MIN
-2.0
-3.0
2.4
1.4
0.0
1.4
0.0
1.4
OUT
0.145
0.603
0.603
=10uF.
TYP
1.65
0.75
.110
1.65
800
340
270
2.2
1
2
1
2
4
www.enpirion.com
0.615
0.621
MAX
+2.0
+3.0
5.5
2.3
2.1
0.4
V
0.2
V
2.1
IN
IN
EN5311QI
UNITS
V/mS
V/mS
MHz
mΩ
mΩ
mA
nA
µA
µA
nA
µA
%
%
Ω
V
V
V
V
V
A
V