LTC3736-1 Datasheet, PDF (28/28 Pages) Linear Technology – Dual 2-Phase, No RSENSE Synchronous Controller with Spread Spectrum

LTC3736-1
TYPICAL APPLICATIO
2-Phase, Spread Spectrum Dual Output, Synchronous DC/DC Converter
V_IN
5V
C_IN
10µF
×2
R_FB1A R_FB1B
59k 187k
C_ITH1A
100pF
22
SW1
SENSE1^{+ 21}
MP1
C_ITH1
220pF
R_ITH1
15k
2200pF
23
24
1
2
3
IPRG1
V_FB1
I_TH1
IPRG2
FREQ
PGND
BG1
20
19
SSDIS
TG1
PGND
18
17
16
4 _SGND
TG2 ¹⁵
R_VIN 10Ω
5 _VIN
RUN/SS ¹⁴
C_ITH2
C_VIN 220pF
1µF
R_ITH2
15k
9
7
8
6
LTC3736EUF-1
BG2
PGOOD PGND
V_FB2 SENSE2⁺
I_TH2
TRACK
SW2
13
12
11
10
PGND
MP2
C_SS
10nF
C_ITH2B
25
100pF
L1
1.5µH
V_OUT1
2.5V
2A
MN1
+
C_OUT1
150µF
MN2
C_OUT2
150µF _VOUT2
1.8V
L2
2A
1.5µH
R_FB2A
59k
R_TRACKA ^RFB2B R_TRACKB
590Ω ^118k 1.18k
MP1, MP2: FDC638P
MN1, MN2: FDC637N
L1, L2: VISHAY IHLP-2525CZ-01
C_OUT1, C_OUT2: SANYO 4TPB150MC
37361 TA02
RELATED PARTS
PART NUMBER
LTC1628/
LTC1628-PG
LTC1735
DESCRIPTION
Dual High Efficiency, 2-Phase Synchronous
Step-Down Controllers
High Efficiency Synchronous Step-Down Controller
LTC1772
LTC1773
LTC1778
Constant Frequency Current Mode Step-Down
DC/DC Controller
Synchronous Step-Down Controller
No R_SENSE^TM Synchronous Step-Down Controller
LTC2923
LTC3251 Series
LTC3252
LTC3416
LTC3701
LTC3708
LTC3728/LTC3728L
LTC3736
LTC3737
LTC6902
Power Supply Tracking Controller
500mA High Efficiency, Low Noise, Inductorless
Step-Down DC/DC Converters
Dual, Low Noise, Inductorless Step-Down DC/DC Converter
4A, 4MHz, Synchronous Step-Down DC/DC Converter
with Output Tracking
2-Phase, Low Input Voltage Dual Step-Down DC/DC Controller
Fast 2-Phase, No R_SENSE Buck Controller with
Output Tracking
Dual, 550kHz, 2-Phase, Synchronous Step-Down
Switching Regulator
Dual, 2-Phase, No R_SENSE, Synchronous Controller with Output
Tracking
Dual, 2-Phase, No R_SENSE Controller with Output Tracking
Multiphase Oscillator with Spread Spectrum Frequency
Modulation
No R_SENSE is a trademark of Linear Technology Corporation.
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
Constant Frequency, Standby, 5V and 3.3V LDOs, V_IN to 36V,
28-Lead SSOP
Burst Mode Operation, 16-Pin Narrow SSOP, Fault Protection,
3.5V ≤ V_IN ≤ 36V
2.5V ≤ V_IN ≤ 9.8V, I_OUT Up to 4A, SOT-23 Package, 550kHz
2.65V ≤ V_IN ≤ 8.5V, I_OUT Up to 4A, 10-Lead MSOP
Current Mode Operation Without Sense Resistor,
Fast Transient Response, 4V ≤ V_IN ≤ 36V
Controls Up to Three Supplies, 10-Lead MSOP
2-Phase, Spread Spectrum Operation, 10-Pin MSOP Package
Spread Spectrum Operation, 4mm × 3mm 12-Pin DFN Package
95% Efficiency, V_IN: 2.25V to 5.5V, I_SD = <1µA,
TSSOP-20E Package
2.5V ≤ V_IN ≤ 9.8V, 550kHz, PGOOD, PLL, 16-Lead SSOP
Constant On-Time Dual Controller, V_IN Up to 36V, Very Low
Duty Cycle Operation, 5mm × 5mm QFN Package
Constant Frequency, V_IN to 36V, 5V and 3.3V LDOs,
5mm × 5mm QFN or 28-Lead SSOP
V_IN: 2.75V to 9.8V, I_OUT Up to 5A, 4mm × 4mm QFN Package
V_IN: 2.75V to 9.8V, I_OUT Up to 5A, 4mm × 4mm QFN Package
Resistor Programs Nominal Frequency and Spreading;
2-, 3-, or 4-Phase Outputs; 10-Pin MSOP Package
37361f
LT/TP 0804 1K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2004