LTC1703IG Datasheet, PDF (3/36 Pages) Linear Technology – Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID

LTC1703
ELECTRICAL CHARACTERISTICS _{The ● denotes specifications which apply over the full operating}
temperature range, otherwise specifications are TA = 25°C. V_CC = 5V unless otherwise specified. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Switching Characteristics
V_OSC
Oscillator Amplitude
f_OSC
Oscillator Frequency
Φ_OSC2
Controller 2 Oscillator Phase
DC_MIN1
Minimum Duty Cycle
DC_MIN2
Minimum Duty Cycle
DC_MAX
Maximum Duty Cycle
t_NOV
Driver Nonoverlap
t_r, t_f
Driver Rise/Fall Time
Feedback Amplifier
Test Circuit 1
Relative to Controller 1
V_FB < V_MAX
V_FB > V_MAX
Test Circuit 1 (Note 9)
Test Circuit 1 (Note 9)
1
● 475
550
750
180
●
7
10
●
0
● 87
90
93
●
40
100
●
12
80
A_VFB
FB DC Gain
GBW
FB Gain Bandwidth
● 74
85
25
I_ERR
FB Sink/Source Current
V_MIN
MIN Comparator Threshold
V_MAX
MAX Comparator Threshold
Current Limit Loop
COMP_N Output
● ±3
± 10
●
760 785
● 815
840
A_VILIM
I_IMAX
I_LIM Gain
I_MAX Source Current
Status Outputs
I_MAX = 0V, LTC1703C
I_MAX = 0V, LTC1703I
● –7
● –7
40
–10 –13
–10 –14
V_FAULT
V_OLF
I_FAULT
t_FAULT
VID Inputs
FAULT Trip Point
FAULT Output Low Voltage
FAULT Output Current
FAULT Delay Time
V_FB Relative to Regulated V_OUT
I_FAULT = 1mA
V_FAULT = 0V
V_FB > V_FAULT to FAULT (Note 9)
● + 10 + 15 + 20
●
0.03
0.1
– 10
25
R11
Resistance Between SENSE and FB1
10
V_OUT Error %
R_PULLUP
VID_T
Output Voltage Accuracy (Side 1)
VID Input Pull-Up Resistance
VID Input Voltage Threshold
I_VID-LEAK
V_PULLUP
VID Input Leakage Current
VID Pull-Up Voltage
Programmed from 0.9V to 2V
V_DIODE = 0.6V (Note 7)
V_IL (2.7V ≤ V_CC ≤ 5.5V)
V_IH (2.7V ≤ V_CC ≤ 5.5V)
V_CC < VID < 7V (Note 7)
V_CC = 3.3V
V_CC = 5V
● – 1.5
1.5
40
0.4
1.6
0.01
±1
2.8
4.5
UNITS
V_P-P
kHz
DEG
%
%
%
ns
ns
dB
MHz
mA
mV
mV
dB
µA
µA
%
V
µA
µs
kΩ
%
kΩ
V
V
µA
V
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: PV_CC and BV_CC (V_BOOST – V_SW) must be greater than V_GS(ON) of
the external MOSFETs used to ensure proper operation.
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: Supply current in normal operation is dominated by the current
needed to charge and discharge the external MOSFET gates. This current
will vary with supply voltage and the external MOSFETs used.
Note 5: Supply current in shutdown is dominated by external MOSFET
leakage and may be significantly higher than the quiescent current drawn
by the LTC1703, especially at elevated temperature.
Note 6: This parameter is guaranteed by correlation and is not tested
directly.
Note 7: Each built-in pull-up resistor attached to the VID inputs also has a
series diode connected to V_CC to allow input voltages higher than the V_CC
supply without damage or clamping. (See Block Diagram.)
Note 8: Feedback current at FB1 will be higher due to internal VID
resistors.
Note 9: Rise and fall times are measured using 10% and 90% levels. Delay
and nonoverlap times are measured using 50% levels.
1703fa
3