boost power supply. Included in the package are the
switching controller, power FETs, and support components.
Operating over an input voltage range of 4.5V to 36V, the
LTM4607 supports an output voltage range of 0.8V to
24V, set by a resistor. This high efficiency design delivers
up to 5A continuous current in boost mode (10A in buck
mode). Only the inductor, sense resistor, bulk input and
output capacitors are needed to finish the design.
The low profile package enables utilization of unused space
on the bottom of PC boards for high density point of load
regulation. The high switching frequency and current
mode architecture enable a very fast transient response
to line and load changes without sacrificing stability. The
LTM4607 can be frequency synchronized with an external
clock to reduce undesirable frequency harmonics.
Fault protection features include overvoltage and foldback
current protection. The DC/DC μModule™ is offered in a
small thermally enhanced 15mm × 15mm × 2.8mm LGA
package. The LTM4607 is Pb-free and RoHS compliant.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. μModule is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Single Inductor Architecture Allows V
IN
Above,
Below or Equal to V
OUT
Wide V
IN
Range: 4.5V to 36V
Wide V
OUT
Range: 0.8V to 24V
5A DC (10A DC in Buck Mode)
High Efficiency Up to 98%
Current Mode Control
Power Good Output Signal
Phase-Lockable Fixed Frequency: 200kHz to 400kHz
Ultra-Fast Transient Response
Current Foldback Protection
Output Overvoltage Protection
Small, Low Profile Surface Mount LGA Package
(15mm × 15mm × 2.8mm)
APPLICATIONS
■
■
■
Telecom, Servers and Networking Equipment
Industrial and Automotive Equipment
High Power Battery-Operated Devices
TYPICAL APPLICATION
20V/2.5A Buck-Boost DC/DC μModule with 4.5V to 36V Input
V
IN
4.5V TO 36V
100
CLOCK SYNC
10μF
50V
ON/OFF
V
IN
RUN
PLLIN V
OUT
FCB
LTM4607
SW1
SW2
R
SENSE
SENSE
+
0.1μF
SS
SGND
PGND
SENSE
–
V
FB
4.12k
4607 TA01
Efficiency and Power Loss vs
Input Voltage
6
5
4
3
2
1
V
OUT
= 20V, 2.5A
f = 200kHz
6
11
16
21
V
IN
(V)
26
31
0
36
POWER LOSS (W)
V
OUT
20V
2.5A
EFFICIENCY (%)
99
98
97
96
95
94
93
10μF
35V
4.7μH
+
330μF
25V
R2
7mΩ
92
91
90
4607 TA01b
4607f
1
LTM4607
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
(See Table 6 Pin Assignment)
TOP VIEW
BANK 2
M
L
V
IN
............................................................. –0.3V to 36V
V
OUT
............................................................. 0.8V to 25V
INTV
CC
, EXTV
CC
, RUN, SS, PGOOD .............. –0.3V to 7V
SW1, SW2 .................................................... –5V to 36V
V
FB
, COMP ................................................ –0.3V to 2.4V
FCB, STBYMD ....................................... –0.3V to INTV
CC
PLLIN ........................................................ –0.3V to 5.5V
PLLFLTR.................................................... –0.3V to 2.7V
Operating Temperature Range
(Note 2) ...............................................–40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range...................–55°C to 125°C
BANK 4
K
J
H
G
BANK 1
BANK 3
BANK 5
F
E
D
C
BANK 6
B
A
1
2
3
4
5
6
7
8
9
10
11
12
LGA PACKAGE
141-LEAD (15mm
×
15mm
×
2.8mm)
T
JMAX
= 125°C,
θ
JP
= 4°C/W, WEIGHT = 1.5g
ORDER INFORMATION
LEAD FREE FINISH
LTM4607EV#PBF
LTM4607IV#PBF
PART MARKING*
LTM4607V
LTM4607V
PACKAGE DESCRIPTION
141-Lead (15mm × 15mm × 2.8mm) LGA
141-Lead (15mm × 15mm × 2.8mm) LGA
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
ELECTRICAL CHARACTERISTICS
SYMBOL
Input Specifications
V
IN(DC)
V
IN(UVLO)
I
Q(VIN)
Input DC Voltage
Undervoltage Lockout Threshold
Input Supply Bias Current
Normal
Standby
Shutdown Supply Current
PARAMETER
The
●
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
CONDITIONS
●
MIN
4.5
TYP
MAX
36
UNITS
V
V
mA
mA
μA
V
IN
Falling
●
3.4
2.8
1.6
35
4
V
RUN
= 0V, V
STBYMD
> 2V
V
RUN
= 0V, V
STBYMD
= Open
60
4607f
2
LTM4607
ELECTRICAL CHARACTERISTICS
SYMBOL
I
OUTDC
PARAMETER
Output Specifications
Output Continuous Current Range
V
IN
= 32V, V
OUT
= 12V
(See Output Current Derating Curves V
IN
= 6V, V
OUT
= 12V
for Different V
IN
, V
OUT
and T
A
)
Reference Voltage Line Regulation
Accuracy
Load Regulation Accuracy
V
IN
= 4.5V to 36V, V
COMP
= 1.2V (Note 3)
V
COMP
= 1.2V to 0.7V
V
COMP
= 1.2V to 1.8V (Note 3)
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Drain to Source Voltage V
DS
= 12V, Bias
Current I
SW
= 10mA
Bias Current I
SW
= 3A
Bias Current I
SW
= 3A
Bias Current I
SW
= 3A
Bias Current I
SW
= 3A
●
●
The
●
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
CONDITIONS
MIN
TYP
10
5
0.002
0.15
–0.15
50
40
25
20
20
20
50
50
50
50
220
220
10
12
8
8
18
12
12
0.02
0.5
–0.5
MAX
UNITS
A
A
%
%
%
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
mΩ
mΩ
mΩ
mΩ
ΔV
FB
/V
FB(NOM)
ΔV
FB
/V
FB(LOAD)
Switch Section
M1 t
r
M1 t
f
M3 t
r
M3 t
f
M2, M4 t
r
M2, M4 t
f
t
1d
t
2d
t
3d
t
4d
Mode Transition 1
Mode Transition 2
M1 R
DS(ON)
M2 R
DS(ON)
M3 R
DS(ON)
M4 R
DS(ON)
Turn-On Time (Note 4)
Turn-Off Time
Turn-On Time
Turn-Off Time
Turn-On Time
Turn-Off Time
M1 Off to M2 On Delay (Note 4)
M2 Off to M1 On Delay
M3 Off to M4 On Delay
M4 Off to M3 On Delay
M2 Off to M4 On Delay
M4 Off to M2 On Delay
Static Drain-to-Source On-
Resistance
Static Drain-to-Source On-
Resistance
Static Drain-to-Source On-
Resistance
Static Drain-to-Source On-
Resistance
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Resistance
Phase Detector Output Current
Oscillator and Phase-Locked Loop
f
NOM
f
LOW
f
HIGH
R
PLLIN
I
PLLFLTR
V
PLLFLTR
= 1.2V
V
PLLFLTR
= 0V
V
PLLFLTR
= 2.4V
f
PLLIN
< f
OSC
f
PLLIN
> f
OSC
260
170
340
300
200
400
50
–15
15
330
220
440
kHz
kHz
kHz
kΩ
μA
μA
4607f
3
LTM4607
ELECTRICAL CHARACTERISTICS
SYMBOL
Control Section
V
FB
V
RUN
I
SS
V
STBYMD(START)
V
STBYMD(KA)
V
FCB
I
FCB
V
BURST
DF
(BOOST, MAX)
DF
(BUCK, MAX)
t
ON(MIN, BUCK)
RFBHI
INTV
CC
ΔV
LDO
/V
LDO
V
EXTVCC
ΔV
EXTVCC(HYS)
ΔV
EXTVCC
V
SENSE(MAX)
V
SENSE(MIN, BUCK)
I
SENSE
PGOOD
ΔV
FBH
ΔV
FBL
ΔV
FB(HYS)
V
PGL
I
PGOOD
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Leakage Current
V
FB
Rising
V
FB
Falling
V
FB
Returning
I
PGOOD
= 2mA
V
PGOOD
= 5V
5.5
–5.5
7.5
–7.5
2.5
0.2
0.3
1
10
–10
%
%
%
V
μA
Feedback Reference Voltage
RUN Pin ON/OFF Threshold
Soft-Start Charging Current
Start-Up Threshold
Keep-Active Power On Threshold
Forced Continuous Threshold
Forced Continuous Pin Current
Burst Inhibit (Constant Frequency)
Threshold
Maximum Duty Factor
Maximum Duty Factor
V
FCB
= 0.85V
Measured at FCB Pin
% Switch M4 On
% Switch M1 On
V
RUN
= 2.2V
V
STBYMD
Rising
V
STBYMD
Rising, V
RUN
= 0V
0.76
–0.3
V
COMP
= 1.2V
●
The
●
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
PARAMETER
CONDITIONS
MIN
0.792
1
1
0.4
TYP
0.8
1.6
1.7
0.7
1.25
0.8
–0.2
5.3
99
99
200
99.5
V
IN
> 7V, V
EXTVCC
= 5V
I
CC
= 0mA to 20mA, V
EXTVCC
= 5V
I
CC
= 20mA, V
EXTVCC
Rising
I
CC
= 20mA, V
EXTVCC
= 6V
Boost Mode
Buck Mode
Discontinuous Mode
V
SENSE–
= V
SENSE+
= 0V
●
●
●
●
MAX
0.808
2.2
UNITS
V
V
μA
V
V
0.84
–0.1
5.5
V
μA
V
%
%
Minimum On-Time for Synchronous Switch M1 (Note 5)
Switch in Buck Operation
Resistor Between V
OUT
and V
FB
Pins
Internal V
CC
Voltage
Internal V
CC
Load Regulation
EXTV
CC
Switchover Voltage
EXTV
CC
Switchover Hysteresis
EXTV
CC
Switch Drop Voltage
Maximum Current Sense Threshold
Minimum Current Sense Threshold
Sense Pins Total Source Current
250
100.5
6.3
2
ns
kΩ
V
%
V
mV
100
6
0.3
5.6
300
60
160
–130
–6
–380
Internal V
CC
Regulator
5.7
5.4
150
190
–150
mV
mV
mV
mV
μA
Current Sensing Section
–95
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTM4607E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTM4607I is guaranteed over the
–40°C to 85°C temperature range.
Note 3:
The LTM4607 is tested in a feedback loop that servos V
COMP
to a
specified voltage and measures the resultant V
FB
.
Note 4:
Turn-on and turn-off time are measured using 10% and 90%
levels. Transition delay time is measured using 50% levels.
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