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Linear Technology Electronic Components Datasheet

LTC3701 Datasheet

2-Phase/ Low Input Voltage/ Dual Step-Down DC/DC Controller

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LTC3701
2-Phase, Low Input Voltage,
Dual Step-Down DC/DC Controller
FEATURES
s Out-of-Phase Controllers Reduce Required
Input Capacitance
s True PLL for Frequency Locking or Frequency
Adjustment
s Operating Frequency Range: 300kHz to 750kHz
s Wide VIN Range: 2.5V to 10V
s Constant Frequency Current Mode Architecture
s Low Dropout: 100% Duty Cycle
s Power Good Output Voltage Monitor
s Internal Soft-Start Circuitry
s Selectable Burst Mode®/Pulse Skipping Operation
at Light Loads
s Output Overvoltage Protection
s Low Quiescent Current: 460µA
s 0.8V ±2% Voltage Reference
s Small 16-Lead Narrow SSOP Package
U
APPLICATIO S
s One or Two Lithium-Ion Powered Applications
s Notebook and Handheld Computers
s Personal Digital Assistants
s Portable Instruments
s Distributed DC Power Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
DESCRIPTIO
The LTC®3701 is a 2-phase dual constant frequency cur-
rent mode step-down DC/DC controller providing excellent
load and line regulation. Power loss and noise due to ESR
of the input capacitor are minimized by operating the two
controller output stages out-of-phase.
The LTC3701 provides a 0.8V ±2% voltage reference and
consumes only 460µA of quiescent current. To further
maximize the life of a battery source, the external
P-channel MOSFET is turned on continuously in dropout
(100% duty cycle).
Switching frequency is internally set at 550kHz, allowing
the use of small inductors and capacitors. For noise sen-
sitive applications, the LTC3701 can be externally syn-
chronized using its phase-locked loop. The frequency can
also be externally set from 300kHz to 750kHz by applying
a voltage to the PLLLPF pin. Burst Mode operation is inhib-
ited during synchronization or when the EXTCLK/MODE
pin is pulled low to reduce noise and RF interference.
The LTC3701 contains independent internal soft-start
circuitry for each controller. Other features include a
power good output voltage monitor and output overvolt-
age and short-circuit protection.
The LTC3701 is available in a small footprint 16-lead nar-
row SSOP package.
TYPICAL APPLICATIO
169k
78.7k
220pF
10k
80.6k
10k
220pF
100k
1 SENSE1
SENSE1+ 16
3
VFB1
15
VIN
2
ITH/RUN1
14
PGATE1
4 SGND LTC3701 PGND 13
6
ITH/RUN2
PGATE2 12
5
VFB2
PGOOD 11
7 10
PLLLPF EXTCLK/MODE
8 SENSE2
SENSE2+ 9
0.03
M1
M2
0.03
VIN
2.5V TO 9.8V
L1
4.7µH +
D1
47µF
VOUT1
2.5V
2A
10µF
D2
L2
4.7µH
47µF
VOUT2
1.8V
2A
D1, D2: IR10BQ015 L1, L2: LQN6C-4R7 M1, M2: FDC638P
3701 F01a
Figure 1. High Efficiency 2-Phase 550kHz Dual Step-Down Converter
Efficiency vs Load Current
100
VIN = 4.2V VIN = 3.3V
90
80
VIN = 6V
70 VIN = 8.4V
60
50
40
1
VOUT = 2.5V
10 100 1000
LOAD CURRENT (mA)
10000
3701 F01b
3701fa
1


Linear Technology Electronic Components Datasheet

LTC3701 Datasheet

2-Phase/ Low Input Voltage/ Dual Step-Down DC/DC Controller

No Preview Available !

LTC3701
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VIN)........................ – 0.3V to 10V
SENSE1, SENSE2, PGATE1, PGATE2,
PLLLPF, SENSE1+, SENSE2+,
EXTCLK/MODE Voltages .............. – 0.3V to (VIN + 0.3V)
VFB1, VFB2, ITH/RUN1,
ITH/RUN2 Voltages .................................. – 0.3V to 2.4V
PGOOD Voltage ........................................ – 0.3V to 10V
PGATE1, PGATE2 Peak Output Current (<10µs) ....... 1A
Operating Ambient Temperature Range
(Note 2) ...................................................–40°C to 85°C
Storage Ambient Temperature Range ... – 65°C to 150°C
Junction Temperature (Note 3) ............................ 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
SENSE11
ITH/RUN1
VFB1
SGND
2
3
4
VFB2
ITH/RUN2
PLLLPF
SENSE2
5
6
7
8
TOP VIEW
16 SENSE1+
15 VIN
14 PGATE1
13 PGND
12 PGATE2
11 PGOOD
10 EXTCLK/MODE
9 SENSE2+
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 150°C, θJA = 140°C/W
ORDER PART
NUMBER
LTC3701EGN
GN PART
MARKING
3701
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 4.2V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Main Control Loops
Input DC Supply Current
Normal Operation
Sleep Mode
Shutdown
UVLO
Undervoltage Lockout Threshold
Shutdown Threshold at ITH/RUN1, 2
Start-Up Current Source on ITH/RUN1, 2
Regulated Feedback Voltage
(Note 4)
2.5V < VIN < 9.8V
2.5V < VIN < 9.8V
2.5V < VIN < 9.8V, ITH/RUN1 = ITH/RUN2 = 0V
VIN < UVLO Threshold
VIN Falling
VIN Rising
VITH/RUN1, 2 = 0V
0°C to 70°C (Note 5), ITH/RUN = 1.3V
–40°C to 85°C (Note 5)
460 780
305 470
9 28
18 30
q 1.55 2.00 2.50
1.70 2.12 2.55
0.2 0.35 0.5
0.25 0.5 0.85
q 0.784 0.8 0.816
q 0.774 0.8 0.826
Output Voltage Line Regulation
Output Voltage Load Regulation
VFB1, 2 Input Current
Output Overvoltage Protect Threshold
Output Overvoltage Protect Hysteresis
2.5V < VIN < 9.8V (Note 5)
ITH/RUN = 0.9V (Note 5)
ITH/RUN = 1.6V
(Note 5)
Measured at VFB
0.05 0.20
0.2 0.8
– 0.2 – 0.8
10 50
0.835 0.88 0.930
20
Gate Drive 1, 2 Rise Time
Gate Drive 1, 2 Fall Time
Maximum Current Sense Voltage (SENSE+ – SENSE)
CL = 3000pF
CL = 3000pF
(Note 6)
40
40
95 120 145
Soft-Start
Current Sense Voltage Step
Time to Maximum Sense Voltage
30
2048
UNITS
µA
µA
µA
µA
V
V
V
µA
V
V
mV/V
%
%
nA
V
mV
ns
ns
mV
mV
Cycles
3701fa
2


Part Number LTC3701
Description 2-Phase/ Low Input Voltage/ Dual Step-Down DC/DC Controller
Maker Linear Technology
Total Page 20 Pages
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