Linear Technology LTC1736 Datasheet page 3

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL PARAMETER
BG Transition Time:
BG t Rise Time
r
BG t Fall Time
f
TG/BG T1D Top Gate Off to Synchronous
Gate-On Delay Time
TG/BG T2D Synchronous Gate Off to Top
Gate-On Delay Time
Internal V Regulator
CC
V Internal V Voltage
INTVCC CC
V Internal V Load Regulation
LDO(INT) CC
V EXTV Drop Voltage
LDO(EXT) CC
V EXTV Switchover Voltage
EXTVCC CC
V EXTV Hysteresis
EXTVCC(HYS) CC
Oscillator
f Oscillator Frequency
OSC
f /f Maximum Sync Frequency Ratio
H OSC
f FCB Pin Threshold For Sync
FCB(SYNC)
PGOOD Output
V PGOOD Voltage Low
PGL
I PGOOD Leakage Current
PGOOD
V PGOOD Trip Level
PG
VID Control
VIDV VID Operating Supply Voltage
CC
I VID Supply Current
VIDVCC
R Resistance Between V
VFB/VOSENSE
R Resistor Ratio Accuracy
RATIO
R VID0 to VID4 Pull-Up Resistance
PULL-UP
V VID Input Voltage Threshold
IDT
I VID Input Leakage Current
VIDLEAK
V VID Pull-Up Voltage
PULL-UP
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T is calculated from the ambient temperature T
J
dissipation P according to the following formulas:
D
LTC1736CG, LTC1736IG: T = T
J
Note 3: The LTC1736 is tested in a feedback loop that servos V
balance point for the error amplifier (V
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: Oscillator frequency is tested by measuring the C
current (I ) and applying the formula:
OSC
 

11
8 477 10 . ( ) 1
=
 
f

OSC
+

 C ( ) pF 11  I
OSC CHG
= 25°C. V
A
CONDITIONS
(Note 9)
C
LOAD
C
LOAD
C
LOAD
C
LOAD
6V < V
I = 0mA to 20mA, V
CC
I = 20mA, V
CC
I = 20mA, EXTV
CC
(Note 5), C
Ramping Negative
I
PGOOD
V
PGOOD
V
OSENSE
V
OSENSE
V
OSENSE
(Note 6) VIDV
and V
OSENSE FB
Programmed from 0.925V to 2.00V
(Note 7) V
(Note 7) VIDV
VIDV
CC
VIDV
CC
and power
A
+ (P • 110°C/W)
A D
to the
FB
= 1.2V).
ITH
charge
OSC
– 1

1
+


I
DIS
The denotes specifications which apply over the full operating
= 15V, V = 5V unless otherwise noted.
IN RUN/SS
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
< 30V, V = 4V
IN EXTVCC
= 4V
EXTVCC
= 5V
EXTVCC
Ramping Positive
CC
= 43pF
OSC
= 2mA
= 5V
with Respect to Set Output Voltage
Ramping Negative
Ramping Positive
= 3.3V
CC
= 0.6V
DIODE
< VID < 7V
CC
= 3.3V
= 5V
Note 6: With all five VID inputs floating (or tied to VIDV
current is typically < 1µA. However, the VIDV
approximately equal to the number of grounded VID input pins times
(VIDV – 0.6V)/40k. (See the Applications Information section for more
CC
detail.)
Note 7: Each built-in pull-up resistor attached to the VID inputs also has a
series diode to allow input voltages higher than the VIDV
damage or clamping. (See the Applications Information section for more
detail.)
Note 8: The minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current ≥ 40% of I
considerations in the Applications Information section).
Note 9: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
LTC1736
MIN TYP MAX UNITS
50 90
40 80
100
70
5.0 5.2 5.4
0.2 1
130 200
4.5 4.7
0.2
265 300 335
1.3
0.9 1.2
110 200
±1
– 6.0 – 7.5 – 9.5
6.0 7.5 9.5
2.7 5.5
0.01 5
10
±0.05
40
0.4 1.0 1.6
±1
0.01
2.8
4.5
) the VIDV
CC CC
current will rise and be
CC
supply without
CC
(see minimum on-time
MAX
ns
ns
ns
ns
V
%
mV
V
V
kHz
V
mV
µA
%
%
V
µA
kΩ
%
kΩ
V
µA
V
V
3