LTC3878_15 Datasheet, PDF (26/26 Pages) Linear Technology – Fast, Wide Operating Range No RSENSE Step-Down DC/DC Controller

LTC3878
Typical Application
4.5V to 14V Input, 0.9V/25A Output at 300kHz
C_SS
0.1µF
R1 R2
10.0k 93.1k
1 _{RUN/SS BOOST} 16
R_PG
100k
2
LTC3878
PGOOD
TG ¹⁵
D_B
CMDSH-3
C_B
0.22µF
C_C1
680pF ^RC
7.5k
3 _VRNG
4 _FCB
5 _ITH
C_C2
100pF
6 _SGND
SW ¹⁴
PGND ¹³
BG ¹²
INTV_CC ¹¹
C_VCC
4.7µF
R_FB1
20.0k
R_FB2 R_ON
2.49k 432k
7 _ION
8 _VFB
V_IN ¹⁰
NC ⁹
C_{F RF}
0.1µF _2.2Ω
C_IN1
10µF
16V
s4
M1
SiR408DP
L1
0.26µH
+ C_IN2
180µF
16V
M2
SiR892DP
C_OUT1
330µF
+
s2
2.5V
s3
C_OUT2
100µF
6.3V
s2
V_IN
4.5V TO 14V
V_OUT
0.9V
25A
C_IN1: TDK C3225X5R1E106MT s4
C_OUT1: SANYO 2R5TPE330M9 s3
C_OUT2: MURATA GRM31CR60J107ME39 s2
L1: PULSE PA0513.261NLT
3878 TA08
Related Parts
PART NUMBER
LTC3879
LTC3854
LTC3851A
LTC3851A-1
DESCRIPTION
No R_SENSE Constant On-Time Synchronous Step-Down
DC/DC Controller
Small Footprint Wide V_IN Range Synchronous Step-Down
DC/DC Controller
No R_SENSE Wide V_IN Range Synchronous Step-Down
DC/DC Controller
LTC3775
High Frequency Synchronous Step-Down DC/DC Controller
LTC3850/LTC3850-1 Dual 2-Phase, High Efficiency Synchronous Step-Down
LTC3850-2
DC/DC Controllers, R_SENSE or DCR Current Sensing and
Tracking
LTC3853
Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R_SENSE or DCR Current Sensing and Tracking
LTC3857/LTC3857-1 Low I_Q, Dual Output 2-Phase Synchronous Step-Down
DC/DC Controller with 99% Duty Cycle
LTC3868/LTC3868-1 Low I_Q, Dual Output 2-Phase Synchronous Step-Down
DC/DC Controller with 99% Duty Cycle
COMMENTS
Very Fast Transient Response, t_ON(MIN) = 43ns, 4V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 0.9V_IN, MSOP-16E, 3mm × 3mm QFN-16
Fixed 400kHz Operating Frequency 4.5V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5.25V, 2mm × 3mm QFN-12
Phase-Lockable Fixed Operating Frequency 250kHz to 750kHz,
4V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5.25V, MSOP-16E, 3mm × 3mm
QFN-16, SSOP-16
Fixed Operating Frequency 250kHz to 1MHz, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 0.8V_IN, 3mm × 3mm QFN-16
Phase-Lockable Fixed Operating Frequency 250kHz to 780kHz,
4V ≤ V_IN ≤ 30V, 0.8V ≤ V_OUT ≤ 5.25V
Phase-Lockable Fixed Operating Frequency 250kHz to 750kHz,
4V ≤ V_IN ≤ 24V, V_OUT Up to 13.5V
Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz,
4V≤ V_IN ≤ 38V,0.8V ≤ V_OUT ≤ 24V, I_Q = 50µA,
Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz,
4V≤ V_IN ≤ 24V,0.8V ≤ V_OUT ≤ 14V, I_Q = 170µA,
26 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3878fa
LT 0710 REV A • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2009