LTC3722-2_15 Datasheet, PDF (3/28 Pages) Linear Technology – Synchronous Dual Mode Phase Modulated Full Bridge Controllers

LTC3722-1/LTC3722-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C. V_CC = 9.5V, C_T = 270pF, R_DPRG = 60.4k, R_SPRG = 100k, unless
otherwise noted (Note 6).
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Supply
V_CCUV
V_CCHY
I_CCST
V_CC Under Voltage Lockout
V_CC UVLO Hysteresis
Start-Up Current
Measured on V_CC
10.25 10.5
V
Measured on V_CC
3.8
4.2
V
V_CC = V_UVLO – 0.3V
LTC3722E-1/LTC3722I-1/LTC3722E-2/LTC3722I-2 l
LTC3722H-1
l
145
230
µA
145
250
µA
I_CCRN
V_SHUNT
R_SHUNT
SUVLO
SHYST
Delay Blocks
Operating Current
Shunt Regulator Voltage
Shunt Resistance
System UVLO Threshold
System UVLO Hysteresis Current
No Load on Outputs
Current into V_CC = 10mA
Current into V_CC = 10mA to 17mA
Measured on UVLO Pin, 10mA into V_CC
Current Flows Out of UVLO Pin
5
8
mA
10.3 10.8
V
1.1
3.5
Ω
4.8
5.0
5.2
V
8.5
10
11.5
µA
DTHR
Delay Pin Threshold
ADLY and PDLY
SBUS = 1.5V
SBUS = 2.25V
l 1.4
1.5
1.6
V
l 2.1
2.25
2.4
V
DHYS
Delay Hysteresis Current
ADLY and PDLY
SBUS = 1.5V, ADLY/PDLY = 1.7V
1.3
mA
DTMO
DFXT
Delay Timeout
Fixed Delay Threshold
R_DPRG = 60.4K
Measured on SBUS
100
ns
4
V
DFTM
Fixed Delay Time
Phase Modulator
SBUS = V_REF , ADLY, PDLY = 1V
70
ns
I_CS
CS Discharge Current
CS = 1V, COMP = 0V, C_T = 4V,
LTC3722-1 Only
50
mA
I_SLP
DC_MAX
DC_MIN
Oscillator
Slope Compensation Current
Maximum Phase Shift
Minimum Phase Shift
Measured on CS, C_T = 1V
C_T = 2.25V
COMP = 4.5V
COMP = 0V
30
µA
68
µA
l 95
98.5
%
l
0
0.5
%
OSCI
OSCT
OSCV
OSYT
Initial Accuracy
Total Variation
C_T Ramp Amplitude
SYNC Threshold
T_A = 25°C, C_T = 270pF
V_CC = 6.5V to 9.5V
Measured on C_T
Measured on SYNC
225
250
275
kHz
l 215
250
285
kHz
2.2
V
1.6
1.9
2.2
V
OSYW
Minimum SYNC Pulse Width
Measured at Outputs (Note 2)
100
ns
OSYR
SYNC Frequency Range
Measured at Outputs (Note 2)
1000
kHz
Error Amplifier
V_FB
FB Input Voltage
FBI
FB Input Range
COMP = 2.5V (Note 4)
Measured on FB (Note 5)
1.172 1.204 1.236
V
–0.3
2.5
V
A_VOL
Open-Loop Gain
IIB
Input Bias Current
COMP = 1V to 3V (Note 4)
COMP = 2.5V (Note 4)
70
90
dB
5
20
nA
V_OH
V_OL
I_SOURCE
I_SINK
Output High
Output Low
Output Source Current
Output Sink Current
Load on COMP = –100µA
Load on COMP = 100µA
COMP = 2.5V
COMP = 2.5V
4.7
4.92
V
0.18
0.4
V
400
800
µA
2
5
mA
For more information www.linear.com/LTC3722
372212fb
3