LTC3252_15 Datasheet, PDF (2/12 Pages) Linear Technology – Dual, Low Noise, Inductorless Step-Down DC/DC Converter

LTC3252
ABSOLUTE AXI U RATI GS
(Notes 1, 6)
V_IN to GND ................................................– 0.3V to 6.0V
EN1, EN2, FB1, FB2 to GND .......... – 0.3V to (V_IN + 0.3V)
I_OUT1, I_OUT2 (Note 3) ........................................... 400mA
Operating Ambient Temperature Range
(Note 2) .................................................. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
FB1 1
EN1 2
V_IN 3
C1⁺ 4
OUT1 5
C1^– 6
12 FB2
11 EN2
10 C2⁺
9 OUT2
8 C2^–
7 GND
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
EXPOSED PAD IS GROUND
(MUST BE SOLDERED TO PCB)
T_JMAX = 125°C, θ_JA = 40°C/W, θ_JC = 4.3°C/W
ORDER PART
NUMBER
LTC3252EDE
DE PART
MARKING
3252
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V, V_OUT1 = V_OUT2 = 1.5V, C1 = C2 = 1µF, Cin = C_OUT1 = C_OUT2 =
4.7µF (all capacitors ceramic) unless otherwise noted.
SYMBOL
V_IN
I_VIN
V_FB1, V_FB2
I_OUT1
I_OUT2
I_FB
V_RIPPLE
PARAMETER
Min Operating Voltage
Max Operating Voltage
Operating Current,
Both Outputs Enabled
Operating Current,
One Output Enabled
Shutdown Current
Feedback Voltage
Output Current
Output Current
FB1, FB2 Input Current
Output Ripple (OUT1 or OUT2)
Spread Spectrum Frequency Range
V_IH
EN1, EN2 Input High Voltage
V_IL
EN1, EN2 Input Low Voltage
I_IH
EN1, EN2 Input High Current
I_IL
EN1, EN2 Input Low Current
t_ON
Turn On Time
OUT1, OUT2 Load Regulation (Referred to FB pin)
Line Regulation
R_OL
Open Loop Output Impedance,
(OUT1 or OUT2)
CONDITIONS
(Note 4)
I_OUT = 0mA, V_EN1 = V_IN, V_EN2 = V_IN,
2.7V ≤ V_IN ≤ 5.5V
I_OUT = 0mA, V_EN1 = 0, V_EN2 = V_IN or V_EN1 = V_IN,
V_EN2 = 0, 2.7V ≤ V_IN ≤ 5.5V
V_M0 = 0V, V_M1 = 0V, 2.7V ≤ V_IN ≤ 5.5V
I_OUT = 0mA, 2.7V ≤ V_IN ≤ 5.5V
V_EN1 = V_IN
V_EN2 = V_IN
V_FB1 = V_FB2 = 0.85V
I_OUT = 250mA
f_MIN Switching Frequency
f_MAX Switching Frequency
2.7V ≤ V_IN ≤ 5.5V
2.7V ≤ V_IN ≤ 5.5V
EN1 = V_IN, EN2 = V_IN
EN1 = 0V, EN2 = 0V
R_OUT = 3Ω
0 ≤ I_OUT1 ≤ 250mA or 0 ≤ I_OUT2 ≤ 250mA
V_IN = 3.0V, I_OUT = 200mA, V_FB = 0.74V (Note 5)
MIN TYP MAX UNITS
q 2.7
V
q
5.5
V
q
60
100
µA
q
35
60
µA
q
0.01
1
µA
q 0.78
0.8
0.82
V
q 250
mA
q 250
mA
q – 50
50
nA
10
mV_P-P
q 0.8
1.0
MHz
q
1.6
2.0
MHz
q 1.2
0.8
V
q
0.8
0.4
V
q –1
1
µA
q –1
1
µA
0.8
ms
0.08
mV/mA
0.2
%/V
q
1
1.4
Ω
3252f
2