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LTC1702IGN#PBF

Description
DC/DC Cntrlr Dual-OUT Step Down 750kHz Automotive 24-Pin SSOP N Tube
File Size398KB,36 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC1702IGN#PBF Overview

DC/DC Cntrlr Dual-OUT Step Down 750kHz Automotive 24-Pin SSOP N Tube

LTC1702IGN#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Outputs2
TopologyStep Down
Maximum Switching Frequency (kHz)750
Minimum Input Voltage (V)3
Maximum Input Voltage (V)7
Operating Supply Voltage (V)3 to 7
Maximum Supply Current (mA)8
Minimum Switching Frequency (kHz)475
Typical Switching Frequency (kHz)550
Synchronous RectifierYes
Synchronous ClockYes
Control MethodPWM
ProgrammabilityNo
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeIndustrial
PackagingTube
Pin Count24
Standard Package NameSOP
Supplier PackageSSOP N
MountingSurface Mount
Package Height1.5(Max)
Package Length8.74(Max)
Package Width3.99(Max)
PCB changed24
Lead ShapeGull-wing
LTC1702
Dual 550kHz Synchronous
2-Phase Switching Regulator Controller
FEATURES
DESCRIPTIO
Two Independent Controllers in One Package
Two Sides Run Out-of-Phase to Minimize C
IN
All N-Channel External MOSFET Architecture
No External Current Sense Resistors
Excellent Output Regulation: 1% Total Output
Accuracy
550kHz Switching Frequency Minimizes External
Component Size
1A to 25A Output Current per Channel
High Efficiency over Wide Load Current Range
Quiescent Current Drops Below 100µA in Shutdown
Small 24-Pin Narrow SSOP Package
APPLICATIO S
Microprocessor Core and I/O Supplies
Multiple Logic Supply Generator
Distributed Power Applications
High Efficiency Power Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode
is a registered trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 5481178,
5847554, 6304066, 6307356, 6580258.
The LTC
®
1702 is a dual switching regulator controller opti-
mized for high efficiency with low input voltages. It includes
two complete, on-chip, independent switching regulator
controllers each designed to drive a pair of external N-channel
MOSFET devices in a voltage mode feedback, synchronous
buck configuration. The LTC1702 uses a constant-frequency,
true PWM design switching at 550kHz, minimizing external
component size and cost and maximizing load transient
performance. The synchronous buck architecture automati-
cally shifts to discontinuous and then to Burst Mode
TM
operation as the output load decreases, ensuring maximum
efficiency over a wide range of load currents.
The LTC1702 features an onboard reference trimmed to
0.5% and can provide better than 1% regulation at the
converter outputs. Open-drain logic outputs indicate whether
either output has risen to within 5% of the final output voltage
and an optional latching FAULT mode protects the load if the
output rises 15% above the intended voltage. Each channel
can be enabled independently; with both channels disabled,
the LTC1702 shuts down and supply current drops below
100µA.
TYPICAL APPLICATIO
C
OUT1
, C
OUT2
: PANASONIC EEFUE0G181R
C
IN
: KEMET TS10X337M010AS
D1, D2: MOTOROLA MBR0520LT1
D3, D4: MOTOROLA MBRS320T3
L1, L2: SUMIDA CEP125-1R0
Q1 TO Q8: FAIRCHILD FDS6670A
1µF
Dual Output High Power 3.3V/2.5V Logic Supply
V
IN
= 5V
±10%
D1
27k
10µF
Q5
21
20
19
18
17
16
15
14
13
27pF
1µF
68k
3300pF
10k
1702 TA01
D2
1µF
1
1µF
2
3
Q1
Q2
4
5
PV
CC
BOOST1
BG1
TG1
SW1
I
MAX1
PGOOD1
FCB
RUN/SS
COMP1
SGND
FB1
LTC1702
I
MAX2
BOOST2
BG2
TG2
SW2
PGND
PGOOD2
FAULT
RUN/SS2
COMP2
FB2
V
CC
10Ω
24
23
22
10µF
+
V
OUT1
2.5V
AT 15A
1µF
L1
1µH
27k
+
C
OUT1
180µF
×4
D3
1.2k
10k
1%
Q3
Q4
6
7
8
820pF
9
1µF
10
4.75k
1%
V
IN
10k
PWRGD1
47k
680pF
27pF
11
12
U
C
IN
330µF
×3
1µF
Q6
L2
1µH
V
OUT2
3.3V/15A
Q7
Q8
D4
1.6k
15.8k
1%
U
U
+
680pF
C
OUT2
180µF
×4
1µF
4.99k
1%
V
IN
PWRGD2
FAULT
1702fa
1

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Description DC/DC Cntrlr Dual-OUT Step Down 750kHz Automotive 24-Pin SSOP N Tube DC/DC Cntrlr Dual-OUT Step Down 750kHz 24-Pin SSOP N Tube DC/DC Cntrlr Dual-OUT Step Down 750kHz 24-Pin SSOP N T/R DC/DC Cntrlr Dual-OUT Step Down 750kHz 24-Pin SSOP N DC/DC Cntrlr Dual-OUT Step Down 750kHz 24-Pin SSOP N T/R DC/DC Cntrlr Dual-OUT Step Down 750kHz Automotive 24-Pin SSOP N T/R DC/DC Cntrlr Dual-OUT Step Down 750kHz 24-Pin SSOP N
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Not Compliant Not Compliant Compliant Not Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Unconfirmed Unconfirmed Active Unconfirmed
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01
Number of Outputs 2 2 2 2 2 2 2
Topology Step Down Step Down Step Down Step Down Step Down Step Down Step Down
Maximum Switching Frequency (kHz) 750 750 750 750 750 750 750
Minimum Input Voltage (V) 3 3 3 3 3 3 3
Maximum Input Voltage (V) 7 7 7 7 7 7 7
Operating Supply Voltage (V) 3 to 7 3 to 7 3 to 7 3 to 7 3 to 7 3 to 7 3 to 7
Maximum Supply Current (mA) 8 8 8 8 8 8 8
Minimum Switching Frequency (kHz) 475 475 475 475 475 475 475
Typical Switching Frequency (kHz) 550 550 550 550 550 550 550
Synchronous Rectifier Yes Yes Yes Yes Yes Yes Yes
Synchronous Clock Yes Yes Yes Yes Yes Yes Yes
Control Method PWM PWM PWM PWM PWM PWM PWM
Programmability No No No No No No No
Minimum Operating Temperature (°C) -40 - - - -40 -40 -40
Maximum Operating Temperature (°C) 85 70 70 70 85 85 85
Supplier Temperature Grade Industrial Commercial Commercial Commercial Industrial Industrial Industrial
Pin Count 24 24 24 24 24 24 24
Standard Package Name SOP SOP SOP SOP SOP SOP SOP
Supplier Package SSOP N SSOP N SSOP N SSOP N SSOP N SSOP N SSOP N
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max)
Package Length 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max)
Package Width 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max)
PCB changed 24 24 24 24 24 24 24
Lead Shape Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing
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