FEATURES
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LTM8029
36V
IN
, 600mA Step-Down
µModule Converter with
5µA Quiescent Current
DESCRIPTION
The
LTM
®
8029
is a 36V
IN
, 600mA step-down µModule
®
converter with 5µA quiescent current. It is an adjustable
frequency buck switching regulator that consumes only
5μA of quiescent current. The LTM8029 can accept an
input as high as 36V
IN
and operates at low input voltages
due to its off-time skipping capability. Burst Mode opera-
tion maintains high efficiency at low output currents while
keeping the output ripple low. The RUN pin features an
accurate threshold and the shutdown current is 0.9μA.
A power good flag signals when V
OUT
reaches 90% of the
programmed output voltage.
The LTM8029 is packaged in a thermally enhanced, com-
pact (11.25mm
×
6.25mm) and low profile (3.42mm)
overmolded ball grid array (BGA) package. The LTM8029
is available with SnPb (BGA) or RoHS compliant terminal
finish.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and µModule are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
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Complete Switch Mode Power Supply
Low Quiescent Current Burst Mode
®
Operation
5μA I
Q
at 12V
IN
to 3.3V
OUT
600mA Output Current
Wide Input Voltage Range: 4.5V to 36V (40V
MAX
)
Output Voltage: 1.2V to 18V
Excellent Dropout Performance
Can Be Used as an Inverter
Adjustable Switching Frequency: 200kHz to 2.2MHz
Current Mode Control
SnPb or RoHS Compliant Finish
Tiny, Low Profile (11.25mm
×
6.25mm
×
3.42mm)
Surface Mount BGA Package
APPLICATIONS
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Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
TYPICAL APPLICATION
Low Quiescent Current, 5V
OUT
, 600mA µModule Regulator
LTM8029
V
IN
5.6V TO 36V
1µF
V
IN
RUN
V
OUT
BIAS
PGOOD
RT
GND
158k
f = 800kHz
FB
309k
22µF
V
OUT
5V
600mA
5.7
Minimum Input Voltage vs Output Current
5.8
INPUT VOLTAGE (V)
5.6
5.5
8029 TA01a
5.4
0
100
400
300
500
200
OUTPUT CURRENT (mA)
600
8029 TA01b
8029fd
For more information
www.linear.com/LTM8029
1
LTM8029
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
5
4
BANK 3
3
2
RUN
1
A
B
C
D
E
F
G
H
RT
BANK 2
FB PGOOD
BIAS
GND
V
IN
BANK 1
V
OUT
V
IN
, RUN ..................................................................40V
V
OUT
, BIAS ................................................................20V
V
IN
+ BIAS .................................................................55V
PGOOD , FB, RT ..........................................................6V
Maximum Internal Temperature ........................... 125°C
Solder Temperature............................................... 260°C
BGA PACKAGE
35-LEAD (11.25mm × 6.25mm × 3.42mm)
T
JMAX
= 125°C,
θ
JA
= 13.8°C/W,
θ
JCtop
= 17.2°C/W,
θ
JCbottom
= 3.9°C/W,
θ
JB
= 9.0°C/W
WEIGHT = 0.6g
ORDER INFORMATION
PART NUMBER
LTM8029EY#PBF
LTM8029IY#PBF
LTM8029IY
LTM8029MPY#PBF
LTM8029MPY
PAD OR BALL
FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
SAC305 (RoHS)
SnPb (63/37)
http://www.linear.com/product/LTM8029#orderinfo
PART MARKING*
DEVICE
LTM8029Y
LTM8029Y
LTM8029Y
LTM8029Y
LTM8029Y
CODE
e1
e1
e0
e1
e0
PACKAGE TYPE
BGA
BGA
BGA
BGA
BGA
MSL RATING
3
3
3
3
3
TEMPERATURE RANGE (Note 2)
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
• Consult Marketing for parts specified with wider operating temperature
ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Terminal Finish Part Marking:
www.linear.com/leadfree
• Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures:
www.linear.com/umodule/pcbassembly
• LGA and BGA Package and Tray Drawings:
www.linear.com/packaging
2
8029fd
For more information
www.linear.com/LTM8029
LTM8029
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
Output DC Voltage
Output DC Current
Quiescent Current Into V
IN
BIAS Current
Line Regulation
Load Regulation
Output RMS Voltage Ripple
Switching Frequency
I
OUT
≤ 0.6A, R
FB
Open
I
OUT
≤ 0.6A, R
FB
= 576k
3.3V
OUT
RUN = 0V
No Load
No Load
600mA Load
V
IN
= 32V, V
OUT
= 20V at 100mA Load
5.5V < V
IN
< 36V, I
OUT
= 600mA
10mA < I
OUT
< 600mA
I
OUT
= 600mA
R
T
= 41.2k
R
T
= 124k
R
T
= 768k
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, RUN = 2V unless otherwise noted (Note 2).
CONDITIONS
l
MIN
TYP
1.2
3.3
MAX
4.5
UNITS
V
V
V
10
0.9
5
l
600
mA
µA
µA
µA
mA
mA
%
%
mV
MHz
MHz
kHz
9
3.6
4.7
0.3
0.4
10
2.2
1
200
1.185
1.175
1.20
1.20
1
l
Voltage at FB Pin
Internal Feedback Resistor
Minimum BIAS Voltage for Proper Operation
RUN Pin Current
RUN Threshold Voltage
RUN Voltage Hysteresis
PGOOD Threshold (at FB)
PGOOD Leakage Current
PGOOD Sink Current
V
OUT
Rising
PGOOD = 6V
PGOOD = 0.4V
RUN = 2.5V
l
1.215
1.225
2.25
30
1.3
V
V
MΩ
V
nA
V
mV
V
1.7
1
0.95
30
1.1
0.1
100
1
µA
µA
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 LTM8029E is guaranteed to meet performance specifications
from 0°C to 125°C internal. Specifications over the full –40°C to
125°C internal operating temperature range are assured by design,
characterization and correlation with statistical process controls.
The LTM8029I is guaranteed to meet specifications over the full –40°C
to 125°C internal operating temperature range. The LTM8029MP is
guaranteed to meet specifications over the full –55°C to 125°C internal
operating temperature range. Note that the maximum internal temperature
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
8029fd
For more information
www.linear.com/LTM8029
3
LTM8029
T
A
= 25°C, unless otherwise noted. Configured per Table 1, where applicable.
2.5V
OUT
Efficiency vs Output
Current, BIAS = 5V
90
85
80
EFFICIENCY (%)
EFFICIENCY (%)
75
70
65
60
55
50
0
10
100
5V
IN
12V
IN
24V
IN
36V
IN
600
8029 G01
TYPICAL PERFORMANCE CHARACTERISTICS
3.3V
OUT
Efficiency vs Output
Current, BIAS = 5V
90
85
80
75
70
65
60
55
50
0
10
100
5V
IN
12V
IN
24V
IN
36V
IN
1000
8029 G02
5V
OUT
Efficiency vs Output
Current, BIAS = 5V
90
85
80
EFFICIENCY (%)
75
70
65
60
55
50
0
10
100
12V
IN
24V
IN
36V
IN
1000
8029 G03
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
8V
OUT
Efficiency vs Output
Current, BIAS = 5V
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
60
1
10
100
1000
8029 G04
12V
OUT
Efficiency vs Output
Current, BIAS = 5V
95
90
85
80
75
70
65
60
0
10
100
1000
8029 G05
18V
OUT
Efficiency vs Output
Current, BIAS = 5V
100
95
EFFICIENCY (%)
90
85
80
75
70
24V
IN
36V
IN
12V
IN
24V
IN
36V
IN
24V
IN
36V
IN
0
10
100
1000
8029 G06
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
1000
Input Current vs Output Current,
2.5V
OUT
, BIAS = 5V
5V
IN
12V
IN
24V
IN
36V
IN
1000
Input Current vs Output Current,
3.3V
OUT
, BIAS = 5V
5V
IN
12V
IN
24V
IN
36V
IN
100
Input Current vs Output Current,
5V
OUT
, BIAS = 5V
12V
IN
24V
IN
36V
IN
INPUT CURRENT (mA)
10
INPUT CURRENT (mA)
INPUT CURRENT (mA)
100
100
100
10
10
1
1
1
0.1
0
10
100
1000
8029 G07
0
0
10
100
1000
8029 G08
0.1
0
10
100
1000
8029 G09
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
4
8029fd
For more information
www.linear.com/LTM8029
LTM8029
T
A
= 25°C, unless otherwise noted. Configured per Table 1, where applicable.
Input Current vs Output Current,
8V
OUT
, BIAS = 5V
12V
IN
24V
IN
36V
IN
TYPICAL PERFORMANCE CHARACTERISTICS
1000
1000
Input Current vs Output Current,
12V
OUT
, BIAS = 5V
24V
IN
36V
IN
1000
Input Current vs Output Current,
18V
OUT
, BIAS = 5V
24V
IN
36V
IN
INPUT CURRENT (mA)
INPUT CURRENT (mA)
10
10
INPUT CURRENT (mA)
1
10
100
1000
8029 G11
100
100
100
10
1
1
1
0.1
1
10
100
1000
8029 G10
0.1
0.1
1
10
100
1000
8029 G12
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
25
Minimum V
IN
vs V
OUT
,
I
OUT
= 600mA, BIAS = 5V
Input Current vs V
IN
,
Output Short, BIAS = 5V
450
400
1700
1600
OUTPUT CURRENT (mA)
1500
1400
1300
1200
1100
0
10
20
V
IN
(V)
8029 G13
8029 G14
Output Short-Circuit Current,
BIAS = 5V
20
INPUT CURRENT (mA)
350
300
250
200
150
100
50
f = 800kHz
f = 800kHz
V
IN
(V)
15
10
f = 400kHz
f = 400kHz
5
0
0
5
10
V
OUT
(V)
15
20
0
30
40
1000
0
10
20
V
IN
(V)
30
40
8029 G15
10
I
BIAS
vs Output Current,
2.5V
OUT
, BIAS = 5V
5V
IN
12V
IN
24V
IN
36V
IN
I
BIAS
(mA)
10
I
BIAS
vs Output Current,
3.3V
OUT
, BIAS = 5V
5V
IN
12V
IN
24V
IN
36V
IN
I
BIAS
(mA)
10
I
BIAS
vs Output Current,
5V
OUT
, BIAS = 5V
12V
IN
24V
IN
36V
IN
1
I
BIAS
(mA)
1
1
0.1
0.1
0.1
0.01
1
10
100
1000
8029 G16
0.01
1
10
100
1000
8029 G17
0.01
1
10
100
1000
8029 G18
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
8029fd
For more information
www.linear.com/LTM8029
5
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