LTC3727A-1 Datasheet, PDF (2/32 Pages) Linear Technology – High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

LTC3727A-1
UW U
ABSOLUTE AXI U RATI GS (Note 1) PACKAGE/ORDER I FOR ATIO
Input Supply Voltage (V_IN).........................36V to – 0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) ...................................42V to – 0.3V
Switch Voltage (SW1, SW2) .........................36V to – 5V
INTV_CC, EXTV_CC, (BOOST1-SW1),
(BOOST2-SW2) ........................................8.5V to – 0.3V
RUN/SS1, RUN/SS2, PGOOD ..................... 7V to – 0.3V
SENSE1⁺, SENSE2 ⁺, SENSE1^–,
SENSE2 ^– Voltages .....................................14V to – 0.3V
PLLIN, PLLFLTR, FCB Voltages ........... INTV_CC to – 0.3V
I_TH1, I_TH2, V_OSENSE1, V_OSENSE2 Voltages ... 2.7V to – 0.3V
Peak Output Current <10µs (TG1, TG2, BG1, BG2) ... 3A
INTV_CC Peak Output Current ................................ 50mA
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
RUN/SS1 1
SENSE1⁺ 2
SENSE1^– 3
V_OSENSE1 4
PLLFLTR 5
PLLIN 6
FCB 7
I_TH1 8
SGND 9
3.3V_OUT 10
I_TH2 11
V_OSENSE2 12
SENSE2^– 13
SENSE2⁺ 14
TOP VIEW
28 PGOOD
27 TG1
26 SW1
25 BOOST1
24 V_IN
23 BG1
22 EXTV_CC
21 INTV_CC
20 PGND
19 BG2
18 BOOST2
17 SW2
16 TG2
15 RUN/SS2
G PACKAGE
28-LEAD PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 95°C/W
ORDER PART NUMBER
LTC3727AEG-1
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 15V, V_{RUN/SS1, 2} = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loops
V_{OSENSE1, 2}
I_{VOSENSE1, 2}
V_REFLNREG
V_LOADREG
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
g_{m1, 2}
g_{mGBW1, 2}
I_Q
Transconductance Amplifier g_m
Transconductance Amplifier GBW
Input DC Supply Current
Normal Mode
Shutdown
(Note 4); I_{TH1, 2} Voltage = 1.2V
(Note 4)
V_IN = 3.6V to 30V (Note 4)
(Note 4)
Measured in Servo Loop; ∆I_TH Voltage = 1.2V to 0.7V
Measured in Servo Loop; ∆I_TH Voltage = 1.2V to 2.0V
I_{TH1, 2} = 1.2V; Sink/Source 5µA (Note 4)
I_{TH1, 2} = 1.2V (Note 4)
(Note 5)
V_IN = 15V, EXTV_CC Tied to V_OUT1, V_OUT1 = 8.5V
V_{RUN/SS1, 2} = 0V
● 0.792 0.800 0.808
V
–5
– 50
nA
0.002 0.02
%/V
●
0.1
0.5
%
●
– 0.1 – 0.5
%
1.3
mmho
3
MHz
670
µA
20
35
µA
3727a1f
2