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LTC1148CS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC1148
LTC1148-3.3/LTC1148-5
114835fd
High Efficiency Synchronous
Step-Down Switching Regulators
LOAD CURRENT (A)
0.02
80
EFFICIENCY (%)
85
90
100
0.2 2
LTC1148 • TA01
95
V
IN
= 6V
V
IN
= 10V
LTC1148-5 Efficiency
■
Ultrahigh Efficiency: Over 95% Possible
■
Current-Mode Operation for Excellent Line and Load
Transient Response
■
High Efficiency Maintained Over Three Decades of
Output Current
■
Low 160µA Standby Current at Light Loads
■
Logic Controlled Micropower Shutdown: I
Q
< 20µA
■
Wide V
IN
Range: 3.5V* to 20V
■
Short-Circuit Protection
■
Very Low Dropout Operation: 100% Duty Cycle
■
Synchronous FET Switching for High Efficiency
■
Adaptive Nonoverlap Gate Drives
■
Output Can Be Externally Held High in Shutdown
■
Available in 14-Pin Narrow SO Package
The LTC
®
1148 series is a family of synchronous step-
down switching regulator controllers featuring automatic
Burst Mode
TM
operation to maintain high efficiencies at
low output currents. These devices drive external comple-
mentary power MOSFETs at switching frequencies up to
250kHz using a constant off-time current-mode architec-
ture providing constant ripple current in the inductor.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V* to 18V (20V maximum).
Constant off-time architecture provides low dropout regu-
lation limited by only the R
DS(ON)
of the external MOSFET
and resistance of the inductor and current sense resistor.
The LTC1148 series combines synchronous switching for
maximum efficiency at high currents with an automatic low
current operating mode, called Burst Mode
operation, which
reduces switching losses. Standby power is reduced to only
2mW at V
IN
= 10V (at I
OUT
= 0). Load currents in Burst Mode
operation are typically 0mA to 300mA.
For operation up to 48V input, see the LTC1149 and
LTC1159 data sheets and Application Note 54.
Figure 1. High Efficiency Step-Down Converter
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode
is a trademark of Linear Technology Corporation.
* LTC1148L and LTC1148L-3.3 only.
Protected by U.S. Patents, including 6580258, 5481178.
■
Notebook and Palmtop Computers
■
Portable Instruments
■
Battery-Operated Digital Devices
■
Cellular Telephones
■
DC Power Distribution Systems
■
GPS Systems
0V = NORMAL
>1.5V = SHUTDOWN
P-CHANNEL
Si4431DY
+
1µF
L*
62µH
R
SENSE
**
0.05Ω
V
OUT
5V/2A
+
C
IN
100µF
V
IN
(5.2V TO 18V)
I
TH
C
T
SGND
C
T
470pF
C
C
3300pF
R
C
1k
+
C
OUT
390µF
D1
MBRS140T3
LT1148 • TA01
N-DRIVE
PGND
N-CHANNEL
Si4412DY
V
IN
P-DRIVE
LTC1148HV-5
SHUTDOWN
SENSE
+
SENSE
–
1000pF
COILTRONICS CTX62-2-MP
KRL SL-1-C1-0R050J
*
**
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1148
LTC1148-3.3/LTC1148-5
114835fd
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
ORDER PART
NUMBER
LTC1148CN
LTC1148HVCN
LTC1148CN-3.3
LTC1148HVCN-3.3
LTC1148CN-5
LTC1148HVCN-5
LTC1148CS
LTC1148HVCS
LTC1148LCS
LTC1148CS-3.3
LTC1148HVCS-3.3
LTC1148LCS-3.3
LTC1148CS-5
LTC1148HVCS-5
LTC1148HVIS-5
WU
U
PACKAGE
/
O
RDER I FOR ATIO
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
9
Feedback Voltage (LTC1148, LTC1148L, V
IN
= 9V ● 1.21 1.25 1.29 V
LTC1148HV)
I
9
Feedback Current (LTC1148, LTC1148L, ● 0.2 1 µA
LTC1148HV)
V
OUT
Regulated Output Voltage V
IN
= 9V
LTC1148-3.3, LTC1148HV-3.3, LTC1148L-3.3 I
LOAD
= 700mA ● 3.23 3.33 3.43 V
LTC1148-5, LTC1148HV-5 I
LOAD
= 700mA ● 4.90 5.05 5.20 V
∆V
OUT
Output Voltage Line Regulation V
IN
= 7V to 12V, I
LOAD
= 50mA – 40 0 40 mV
Output Voltage Load Regulation
LTC1148-3.3, LTC1148HV-3.3, LTC1148L-3.3 5mA < I
LOAD
< 2A ● 40 65 mV
LTC1148-5, LTC1148HV-5 5mA < I
LOAD
< 2A ● 60 100 mV
Output Ripple (Burst Mode) I
LOAD
= 0A 50 mV
P-P
I
Q
Input DC Supply Current (Note 3) (Note 7)
LTC1148 Series
Normal Mode 4V < V
IN
< 12V 1.6 2.1 mA
Sleep Mode 4V < V
IN
< 12V 160 230 µA
Sleep Mode (LTC1148-5) 6V < V
IN
< 12V 160 230 µA
Shutdown V
SHUTDOWN
= 2.1V, 4V < V
IN
< 12V 10 20 µA
LTC1148HV Series
Normal Mode 4V < V
IN
< 18V 1.6 2.3 mA
Sleep Mode 4V < V
IN
< 18V 160 250 µA
Sleep Mode (LTC1148HV-5) 6V < V
IN
< 18V 160 250 µA
Shutdown V
SHUTDOWN
= 2.1V, 4V < V
IN
< 18V 10 22 µA
LTC1148L Series
Normal Mode 3.5V < V
IN
< 12V 1.6 2.1 mA
Sleep Mode 3.5V < V
IN
< 12V 160 230 µA
Shutdown V
SHUTDOWN
= 2.1V, 3.5V < V
IN
< 12V 10 20 µA
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHUTDOWN
= 0V unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
1
2
3
4
5
6
7
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SO
N PACKAGE
14-LEAD PDIP
14
13
12
11
10
9
8
P-DRIVE
NC
V
IN
C
T
INTV
CC
I
TH
SENSE
–
N-DRIVE
NC
PGND
SGND
SHUTDOWN
V
FB
*
SENSE
+
*FIXED OUTPUT VERSIONS = NC
T
JMAX
= 125°C,
θ
JA
= 70°C/ W (N)
T
JMAX
= 125°C,
θ
JA
= 110°C/ W (S)
(Note 1)
Input Supply Voltage (Pin 3)
LTC1148 and LTC1148L Series ............ 16V to –0.3V
LTC1148HV Series ............................... 20V to – 0.3V
Continuous Output Current (Pins 1, 14) .............. 50mA
Sense Voltages (Pins 7, 8)
LTC1148HV (Adjustable Only)
V
IN
≥ 12.7V ...................................... 13V to – 0.3V
V
IN
< 12.7V ......................... (V
IN
+ 0.3V) to –0.3V
Operating Ambient Temperature Range ...... 0°C to 70°C
Extended Commercial and Industrial
Temperature Range ............................... – 40°C to 85°C
Junction Temperature (Note 2)............................ 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3
LTC1148
LTC1148-3.3/LTC1148-5
114835fd
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
8
– V
7
Current Sense Threshold Voltage
LTC1148, LTC1148HV, LTC1148L V
SENSE
–
= 5V, V
9
= V
OUT
/4 + 25mV (Forced) 25 mV
V
SENSE
–
= 5V, V
9
= V
OUT
/4 – 25mV (Forced) ● 130 150 170 mV
LTC1148-3.3, LTC1148HV-3.3 V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
LTC1148L-3.3 V
SENSE
–
= V
OUT
– 100mV (Forced) ● 130 150 170 mV
LTC1148-5, LTC1148HV-5 V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 130 150 170 mV
V
10
Shutdown Pin Threshold 0.5 0.8 2 V
I
10
Shutdown Pin Input Current 0V < V
SHUTDOWN
< 8V, V
IN
= 16V 1.2 5 µA
I
4
C
T
Pin Discharge Current V
OUT
in Regulation, V
SENSE
–
= V
OUT
50 70 90 µA
V
OUT
= 0V 2 10 µA
t
OFF
Off Time (Note 5) C
T
= 390pF, I
LOAD
= 700mA 4 5 6 µs
t
R
, t
F
Driver Output Transition Times C
L
= 3000pF (Pins 1, 14), V
IN
= 6V 100 200 ns
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
9
Feedback Voltage (LTC1148, LTC1148HV V
IN
= 9V 1.20 1.25 1.30 V
LTC1148L)
∆V
OUT
Regulated Output Voltage V
IN
= 9V
LTC1148-3.3, LTC1148HV-3.3, LTC1148L-3.3 I
LOAD
= 700mA 3.17 3.33 3.43 V
LTC1148-5, LTC1148HV-5 I
LOAD
= 700mA 4.85 5.05 5.20 V
I
Q
Input DC Supply Current (Note 3) (Note 7)
LTC1148 Series
Normal Mode 4V < V
IN
< 12V 1.6 2.4 mA
Sleep Mode 4V < V
IN
< 12V 160 260 µA
Sleep Mode 6V < V
IN
< 12V 160 260 µA
Shutdown V
SHUTDOWN
= 2.1V, 4V < V
IN
< 12V 10 22 µA
LTC1148HV Series
Normal Mode 4V < V
IN
< 18V 1.6 2.6 mA
Sleep Mode 4V < V
IN
< 18V 160 280 µA
Sleep Mode 6V < V
IN
< 18V 160 280 µA
Shutdown V
SHUTDOWN
= 2.1V, 4V < V
IN
< 18V 10 24 µA
LTC1148L Series
Normal Mode 3.5V < V
IN
< 12V 1.6 2.4 mA
Sleep Mode 3.5V < V
IN
< 12V 160 260 µA
Shutdown V
SHUTDOWN
= 2.1V, 3.5V < V
IN
< 12V 10 22 µA
V
8
– V
7
Current Sense Threshold Voltage
LTC1148, LTC1148HV, LTC1148L (Note 4) V
SENSE
–
= 5V, V
9
= V
OUT
/4 – 25mV (Forced) 25 mV
V
SENSE
–
= 5V, V
9
= V
OUT
/4 + 25mV (Forced) 125 150 175 mV
LTC1148-3.3, LTC1148HV-3.3, LTC1148L-3.3 V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) 125 150 175 mV
LTC1148-5, LTC1148HV-5 V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) 125 150 175 mV
V
10
Shutdown Pin Threshold 0.55 0.8 2 V
t
OFF
Off Time (Note 5) C
T
= 390pF, I
LOAD
= 700mA 3.8 5 6 µs
–40°C ≤ T
A
≤ 85°C (Note 5), V
IN
= 10V, unless otherwise noted.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHUTDOWN
= 0V unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
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LTC1148CS#TRPBF

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Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Hi Eff Sync Buck Sw Regs
Lifecycle:
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