LTC3602_15 Datasheet, PDF (3/20 Pages) Linear Technology – 2.5A, 10V, Monolithic Synchronous Step-Down Regulator

LTC3602
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 8.4V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
ΔV_PGOOD
R_PGOOD
I_FB
g_m
Power Good Range
Power Good Resistance
FB Input Bias Current
Transconductance Amplifier g_m
±10
±12
%
11
18
Ω
10
nA
1.7
ms
I_S
Supply Current
Active Mode
Sleep Mode
Shutdown
(Note 4)
500
700
μA
75
100
μA
0.2
1
μA
INTV_CC
t_{ON, MIN}
V_RUN
I_TRACK/SS
f_OSC
f_SYNC
R_DS(ON)
V_CC LDO Output Voltage
Minimum Controllable ON-Time
RUN Pin ON Threshold
TRACK/SS Pull-Up Current
Oscillator Frequency
SYNC Capture Range
Top Switch On-Resistance
Bottom Switch On-Resistance
V_RUN Rising
R_T = 105k
4.8
5
5.2
V
90
ns
l 0.4
0.7
1
V
1.25
μA
0.8
1
1.2
MHz
0.3
3
MHz
90
mΩ
67
mΩ
I_LIM
Peak Current Limit
3.8
4.5
5.2
A
I_LSW
V_UVLO
V_{UVLO, HYS}
Switch Leakage Current
INTV_CC Undervoltage Lockout
INTV_CC Undervoltage Lockout Hysteresis
INTV_CC Ramping Up
0.1
1
μA
4.1
4.2
4.3
V
700
mV
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: The LTC3602E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: The LTC3602 is tested in a feedback loop that adjusts V_FB to
achieve a specified error amplifier output voltage (I_TH).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T_J is calculated from the ambient temperature T_A and the power
dissipation as follows: T_J = T_A + (P_D)(θ_JA C/W).
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 7: This limit indicates the current density limitations of the internal
metallization and it is not tested in production.
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Operation
V_IN = 7V
V_OUT = 3.3V
LOAD = 50mA
OUTPUT
VOLTAGE
50mV/DIV
Load Step Transient Forced Continuous
V_IN = 7V
V_OUT = 3.3V
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
500mA/DIV
10μs/DIV
3602 G01
LOAD
CURRENT
1A/DIV
10μs/DIV
3602 G02
3602fb
3