LTC3569_15 Datasheet, PDF (3/26 Pages) Linear Technology – Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References

LTC3569
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V unless otherwise noted (Notes 2, 7).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
SV_IN
Input Supply Voltage
l 2.5
5.5
I_VIN
Input Current Pulse-Skipping Mode
EN1 = SV_IN, EN2, EN3 = MODE = 0V,
I_OUT1, = 0A, FB1 = 0.9V (Note 3)
230
365
Input Current Burst Mode Operation
EN1 = MODE = SV_IN, EN2, EN3 = 0V,
I_OUT1, = 0A, FB1 = 0.9V (Note 3)
47
82
I_QX
Additional Input Current per Buck,
MODE = 0V, I_OUTX, = 0A, FBx = 0.9V
Pulse Skipping
(Note 3)
140
225
Additional Input Current per Buck,
Burst Mode Operation
MODE = SV_IN, I_OUTX, = 0A,
FBx = 0.9V (Note 3)
22
36
I_QSHDN
I_PK1
I_PK2, I_PK3
V_FBX(MAX)
V_FBX(STEP)
V_FBX(MIN)
V_PROGFBX
I_FBX
I_LKSWX
D_X
R_P1
R_N1
R_P2, R_P3
R_N2, R_N3
RSWx_PD
∆V_LINEREG
∆V_LOADREG
t_SS
t_EN
Quiescent Current in Shutdown Mode
Peak Inductor Current SW1
Peak Inductor Current SW2, SW3
Maximum Feedback Voltage
Feedback Reference Step Size
Minimum Feedback Voltage
Feedback Programming Range
Feedback Pin Input Current
Switch Pin Leakage Current
Maximum Duty Cycle
R_DSON of PSW for SW1
R_DSON of NSW for SW1
R_DSON of PSW for SW2, SW3
R_DSON of NSW for SW2, SW3
SWx Pull-Down in Shutdown
Reference Voltage Line Regulation
Output Voltage Load Regulation
Soft-Start Reference Ramp Rate
Enable Turn-On Delay
EN1, EN2, EN3 = 0V
V_SW1 = V_SW2 = V_SW3 = 0V
Each Toggle on ENx
ENx Toggle 15 Times
V_FB = 0.8V
V_SWX = 1.8V, V_ENX = SV_IN,
V_FBX = 0.9V
FBx = 0V
I_SW1 = 100mA (Note 5)
I_SW1 = –100mA (Note 5)
I_SW2, I_SW3 = 100mA (Note 5)
I_SW2, I_SW3 = –100mA (Note 5)
ENx = 0V, V_SWX = 1.2V,
(FBx < SV_IN )
SV_IN = 2.5V to 5.5V
Pulse-Skipping Mode (Note 4)
From Last ENx Rise to Begin of
Soft-Start Ramp
1.8
0.780
l 0.784
l 0.405
0.425
l
100
0.1
2.0
1.0
0.8
25
0.425
195
180
265
250
2.3
0.04
0.5
0.75
125
1
2.5
1.3
0.816
0.44
0.8
±0.2
±1
0.2
240
t_OFF
t_PW
I_ENX
I_MODE
V_IL
V_IH
T_MODEPW
Enable Turn-Off Delay
Enable Pulse Width
Enable Leakage Current
Mode Leakage Current
Input Low Voltage
Input High Voltage
Pulse Width Applied to MODE Pin for
Synchronizing
From ENx Fall to Shutdown
V_ENX = 3.6V
V_MODE = 3.6V
MODE, ENx
MODE, ENx
170
330
0.06
55
0.02
0.02
0.4
1.2
100
PGOOD
Power Good Threshold
V_FBX Ramping Up
–8
V_FBX Ramping Down
–12
T_PGOOD
PGOOD Delay
Turn-On
8
Turn-Off
2
UNITS
V
µA
µA
µA
µA
µA
A
A
V
mV
V
V
µA
µA
%
mΩ
mΩ
mΩ
mΩ
kΩ
%/V
%
V/ms
µs
µs
µs
µA
µA
V
V
ns
%
%
µs
µs
For more information www.linear.com/LTC3569
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