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SLVS789A – NOVEMBER 2007 – REVISED FEBRUARY 2008
ELECTRICAL CHARACTERISTICS
VIN = 3.6 V, CTRL = VIN, T
A
= –40°C to 85°C, typical values are at T
A
= 25°C (unless otherwise noted)
PARAMETER
SUPPLY CURRENT
V
I
I
Q
I
SD
UVLO
V
hys
V
(CTRLh)
V
(CTRL)
R
(CTRL)
t
off
t
es_det
t
es_delay
t
es_win
V
REF
V
(REF_PWM)
I
FB
f
S
D
max
t
min_on
I
sink
I
source
G
ea
R
ea
f
ea
Input voltage range, VIN
Operating quiescent current into VIN
Shutdown current
Under-voltage lockout threshold
Under-voltage lockout Hysteresis
CTRL logic high voltage
CTRL logic low voltage
CTRL pull down resistor
CTRL pulse width to shutdown
Easy Scale detection time
(1)
Easy Scale detection delay
Easy Scale detection window time
Voltage feedback regulation voltage
Voltage feedback regulation voltage under
reprogram
Voltage feedback input bias current
Oscillator frequency
Maximum duty cycle
Minimum on pulse width
Comp pin sink current
Comp pin source current
Error amplifier transconductance
Error amplifier output resistance
Error amplifier crossover frequency
5 pF connected to COMP
5 pF connected to COMP
VIN = 3.6 V
VIN = 3.0 V
V
SW
= 35 V, T
A
= 25°C
D = D
max
D = D
max
0.96
1.2
0.7
5
180
213
240
V
FB
= 100 mV
V
FB
= 492 mV
V
FB
= 1.229 V
1.0
90%
1.2
93%
40
100
100
320
6
500
0.3
0.6
0.7
1
1.44
400
ns
µA
µA
µmho
MΩ
kHz
CTRL high to low
CTRL pin low
VIN = 3 V to 18 V
VIN = 3 V to 18 V
400
2.5
260
100
1
1.204
477
1.229
492
1.254
507
200
1.5
800
1.2
0.4
1600
Device PWM switching no load
CRTL=GND, VIN = 4.2 V
VIN falling
2.2
70
3.0
18
2.3
1
2.5
V
mA
µA
V
mV
V
V
kΩ
ms
µs
µs
ms
V
mV
nA
MHz
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ENABLE AND REFERENCE CONTROL
VOLTAGE AND CURRENT CONTROL
POWER SWITCH
R
DS(on)
I
LN_NFET
OC and SS
I
LIM
I
LIM_Start
t
Half_LIM
t
REF
t
step
(1)
N-Channel MOSFET current limit
Start up current limit
Time step for half current limit
Vref filter time constant
V
REF
ramp up time
A
A
ms
µs
µs
N-channel MOSFET on-resistance
N-channel leakage current
Ω
µA
EasyScale communication is allowed immediately after the CTRL pin has been low for more than t
es_det
. To select EasyScale™ mode,
the CTRL pin must be low for more than t
es_det
the end of t
es_win
.
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