LTC3548 Datasheet, PDF (2/16 Pages) Linear Technology – Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN Voltages.................................................– 0.3V to 6V
V_FB1, V_FB2, RUN1, RUN2
Voltages ..................................... – 0.3V to V_IN + 0.3V
MODE/SYNC Voltage ...................... – 0.3V to V_IN + 0.3V
SW1, SW2 Voltage ......................... – 0.3V to V_IN + 0.3V
POR Voltage ................................................– 0.3V to 6V
Ambient Operating Temperature
Range (Note 2) ................................... – 40°C to 85°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
LTC3548EMSE only .......................................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V_FB1 1
RUN1 2
V_IN 3
SW1 4
GND 5
10 V_FB2
9 RUN2
11
8 POR
7 SW2
6 MODE/
SYNC
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
DD PIN 11, EXPOSED PAD: PGND
MUST BE CONNECTED TO GND
T_JMAX = 125°C, θ_JA = 45°C/W, θ_JC = 3°C/W
(Soldered to a 4-layer board)
ORDER PART
NUMBER
LTC3548EDD
DD PART MARKING
LBNJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
V_FB1 1
RUN1 2
10 V_FB2
9 RUN2
V_IN 3
11
8 POR
SW1 4
7 SW2
GND 5
6 ^MODE/
SYNC
MSE PACKAGE
10-LEAD PLASTIC MSOP
MSE PIN 11, EXPOSED PAD: PGND
MUST BE CONNECTED TO GND
T_JMAX = 125°C, θ_JA = 45°C/W, θ_JC = 10°C/W
(Soldered to a 4-layer board)
ORDER PART
NUMBER
LTC3548EMSE
MSE PART MARKING
LTBNH
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V, unless otherwise specified. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_IN
I_FB
V_FB
∆V_{LINE REG}
∆V_{LOAD REG}
I_S
f_OSC
f_SYNC
I_LIM
R_DS(ON)
Operating Voltage Range
● 2.5
5.5
V
Feedback Pin Input Current
●
30
nA
Feedback Voltage (Note 3)
Reference Voltage Line Regulation
Output Voltage Load Regulation
0°C ≤ T_A ≤ 85°C
–40°C ≤ T_A ≤ 85°C
V_IN = 2.5V to 5.5V (Note 3)
(Note 3)
0.588 0.6 0.612
V
● 0.585 0.6 0.612
V
0.3
0.5
%/V
0.5
%
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
Synchronization Frequency
V_FB1 = V_FB2 = 0.5V
V_FB1 = V_FB2 = 0.63V, MODE/SYNC = 3.6V
RUN = 0V, V_IN = 5.5V, MODE/SYNC = 0V
700 950
µA
40
60
µA
0.1
1
µA
V_FB = 0.6V
● 1.8
2.25
2.7
MHz
2.25
MHz
Peak Switch Current Limit Channel 1
Peak Switch Current Limit Channel 2
Top Switch On-Resistance
Bottom Switch On-Resistance
V_IN = 3V, V_FB = 0.5V, Duty Cycle <35%
V_IN = 3V, V_FB = 0.5V, Duty Cycle <35%
(Note 6)
(Note 6)
0.95
1.2
1.6
A
0.6
0.7
0.9
A
0.35 0.45
Ω
0.30 0.45
Ω
I_SW(LKG)
Switch Leakage Current
V_IN = 5V, V_RUN = 0V, V_FB = 0V
0.01
1
µA
3548f
2