LTC3828 Datasheet, PDF (2/32 Pages) Linear Technology – Dual 2-Phase Step-Down Controller with Tracking

LTC3828
ABSOLUTE AXI U RATI GS (Note 1)
Input Supply Voltage (V_IN)........................ 30V to – 0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) .................................. 36V to – 0.3V
Switch Voltage (SW1, SW2) ........................ 30V to – 5V
INTV_CC, DRV_CC, RUN1, RUN2, (BOOST1-SW1),
(BOOST2-SW2) .......................................... 7V to – 0.3V
SENSE1⁺, SENSE2 ⁺, SENSE1^–,
SENSE2 ^– Voltages ....................... (1.1)INTV_CC to – 0.3V
FCB/PLLIN, PLLFLTR, CLKOUT,
PHSMD Voltage .............................. INTV_CC to – 0.3V
TRCKSS1, TRCKSS2 ........................... INTV_CC to – 0.3V
PGOOD ..................................................... 5.5V 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 7)
LTC3828E .......................................... – 40°C to 85°C
Junction Temperature (Note 2) ............................ 125°C
Storage Temperature Range ................ – 65°C to 125°C
Reflow Peak Body Temperature (UH Package) .... 260°C
Lead Temperature (Soldering, 10 sec)
(GN Package) ................................................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TRCKSS1 ¹
I_TH1 ²
SENSE1+ ³
SENSE1– ⁴
V_OSENSE1 ⁵
PLLFLTR ⁶
RUN1 ⁷
FCB/PLLIN ⁸
SGND ⁹
TRCKSS2 ¹⁰
SENSE2^{– 11}
SENSE2^{+ 12}
I_TH2 ¹³
V_OSENSE2 ¹⁴
TOP VIEW
28 CLKOUT
27 PGOOD
26 BOOST1
25 TG1
24 SW1
23 V_IN
22 INTV_CC
21 PGND
20 BG1
19 BG2
18 SW2
17 TG2
16 BOOST2
15 RUN2
G PACKAGE
28-LEAD PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 95°C/W
ORDER PART
NUMBER
LTC3828EG
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
32 31 30 29 28 27 26 25
V_OSENSE1 1
PLLFLTR 2
RUN1 3
PHSMD 4
FCB/PLLIN 5
24 SW1
23 V_IN
22 INTV_CC
21 DRV_CC
33
20 PGND
SGND 6
19 BG1
TRCKSS2 7
18 BG2
NC 8
17 SW2
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 34°C/W
EXPOSED PAD IS SGND (PIN 33),
MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
LTC3828EUH
UH PART
MARKING
3828
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_{RUN1, 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
g_{m1, 2}
Regulated Feedback Voltage
Feedback Current
(Note 3); I_{TH1, 2} Voltage = 1.2V
(Note 3)
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifier g_m
V_IN = 4.6V to 28V (Note 3)
(Note 3)
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 5uA; (Note 3)
● 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
3828f
2