Ata6264 [preliminary – Atmel ATA6264 User Manual
Page 27
27
4929B–AUTO–01/07
ATA6264 [Preliminary]
Necessary for operation:
V
K15
= 3V to 40V, V
K30
= 5V to 40V, C
GEVZ
= 200 pF to 2 nF, V
INT
= 3.7V to 5.47V
Operating conditions of all other supply pins:
V
SAT
, V
PERI
and V
CORE
are within functional range limits, T
j
= –40°C to 150°C
Other pins:
As defined in
Section 4. ”Functional Range” on page 8
Table 9-1.
Electrical Characteristics – EVZ Step-up Regulator
No. Parameters
Test Conditions
Pin
Symbol
Min
Typ.
Max.
Unit
Type*
8.1
Switching frequency
V
K30
≥
8V or V
EVZ
≥
8V
(after startup)
GEVZ
f
GEVZ
–5%
100
+5%
kHz
A
8.2
Switching frequency
4V < V
K30
< 8V or
4V < V
EVZ
< 8V
(after startup)
GEVZ
f
GEVZ
–10%
100
+10%
kHz
A
8.3
Voltage level at K15 to start the
EVZ regulator
See number 7.1 of
A
8.4
Hysteresis at K15 to stop the
EVZ regulator
See number 7.2 of
A
8.5
Voltage level at K30 to start the
EVZ regulator
See number 7.3 of
A
8.6
Hysteresis at K30 to stop the
EVZ regulator
See number 7.4 of
A
8.7
Voltage at pin GEVZ to switch
through the external driver
V
K30
≥
3.85V to 5V
(ON threshold)
GEVZ
V
GEVZ
V
K30
–
0.5V
V
K30
V
A
8.8
Voltage at pin GEVZ to switch
through the external driver
V
K30
≥
7V
GEVZ
V
GEVZ
6
10
V
A
8.9
Driving current at pin GEVZ to
switch through the external
driver
V
GEVZ
≤
5V
GEVZ
I
GEVZ
–600
–80
mA
A
8.10
Gate charge delivered to the
external FET
V
GEVZ
= 5V
GEVZ
Q
GEVZ
10
nC
D
8.11
Gate charge delivered to the
external FET
V
GEVZ
= 10V
GEVZ
Q
GEVZ
20
nC
D
8.12 Pull-down resistor at pin GEVZ
GEVZ
R
GEVZ
20
50
k
Ω
A
8.13
R
Dson
of dynamic sinking
transistor at GEVZ
GEVZ
R
GEVZ
28
Ω
A
8.15
Voltage between pins OCEVZ
and GND to detect overcurrent
OCEVZ
V
OCEVZ
0.475
0.525
V
A
8.16 Maximum switch duty cycle
V
K30
≥
8V or V
EVZ
≥
8V
(after startup)
V
EVZ
≥
8V
GEVZ
D
GEVZ
87.5
90
92.5
%
A
8.17 Maximum switch duty cycle
4V < V
K30
< 8V or
4V < V
EVZ
< 8V
(after startup)
GEVZ
D
GEVZ
75
90
92.5
%
A
8.18 Minimum switch duty cycle
GEVZ
D
GEVZ
0
%
A
8.19
Overvoltage at pin EVZ to switch
off the regulator
V
EVZExt
programmed
(via external divider)
VEVZ
V
EVZ
40.5
46.2
V
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter