LTC3622_15 Datasheet, PDF (4/24 Pages) Linear Technology – 17V, Dual 1A Synchronous Step-Down Regulator with Ultralow Quiescent Current

LTC3622/
LTC3622-2/LTC3622-23/5
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_IN1 = V_IN2 = 12V, unless otherwise noted. (Notes 3, 6)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
f_OSC
Oscillator Frequency
External CLK Amplitude
SYNC Capture Range
LTC3622-2/LTC3622-23/5 –40°C ≤ T_A ≤ 150°C l 1.8 2.25 2.6
MHz
LTC3622
–40°C ≤ T_A ≤ 125°C l 0.82 1.00 1.16
MHz
LTC3622
–40°C ≤ T_A ≤ 150°C l 0.75 1.00 1.16
MHz
0.4
V_INTVCC–0.3
V
% of Programmed Frequency
50
150
%
V_INTVCC
R_PGOOD
t_PGOOD
INTV_CC Voltage
Power Good Range
Power Good Resistance
PGOOD Delay
V_IN > 4V
PGOOD R_DS(ON) at 2mA
PGOOD Low to High
PGOOD High to Low
3.3
3.6
3.9
V
–7.5 –11
%
275 350
Ω
0
Cycles
32
Cycles
Phase Shift Between Channel 1 and Channel V_PHASE = 0V
2
V_PHASE = INTV_CC, V_MODE/SYNC = 0V
0
Deg
180
Deg
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. Transient Absolute Maximum Voltages should not be applied for
more than 4% of the switching duty cycle.
Note 3. The LTC3622 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3622E is guaranteed to meet specified performance from
0°C to 85°C. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3622I is guaranteed over the
–40°C to 125°C operating junction temperature range and the LTC3622H
is guaranteed over the -40°C to 150°C operating junction temperature
range. High junction temperatures degrade operating lifetimes; operating
lifetime is derated for junction temperatures greater than 125°C. Note that
the maximum ambient temperature consistent with these specifications
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environment
factors.
Note 4. The quiescent current in active mode does not include switching
loss of the power FETs.
Note 5. The LTC3622 is tested in a proprietary test mode that connects
V_FB to the output of error amplifier.
Note 6. T_J is calculated from the ambient T_A and power dissipation P_D
according to the following formula: T_J = T_A + (P_D • θ_JA)
3622fa
4
For more information www.linear.com/LTC3622