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LTC1266CS-3.3#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC1266
LTC1266-3.3/LTC1266-5
Synchronous Regulator
Controller for
N- or P-Channel MOSFETs
■
Ultrahigh Efficiency: Over 95% Possible
■
Drives N-Channel MOSFET for High Current or
P-Channel MOSFET for Low Dropout
■
Pin Selectable Burst Mode Operation
■
1% Output Accuracy (LTC1266A)
■
Pin Selectable Phase of Topside Driver for Boost
or Step-Down Operation
■
Wide V
IN
Range: 3.5V to 20V
■
On-Chip Low-Battery Detector
■
High Efficiency Maintained Over Large Current Range
■
Low 170µA Standby Current at Light Loads
■
Current Mode Operation for Excellent Line and Load
Transient Response
■
Logic Controlled Micropower Shutdown: I
Q
< 40µA
■
Short-Circuit Protection
■
Synchronous Switching with Nonoverlaping Gate Drives
■
Available in 16-Pin Narrow SO Package
The LTC
®
1266 series is a family of synchronous switching
regulator controllers featuring automatic Burst Mode
TM
operation to maintain high efficiencies at low output
currents. These devices drive external power MOSFETs at
switching frequencies up to 400kHz using a constant off-
time current mode architecture providing constant ripple
current in the inductor. They can drive either an N-channel
or a P-channel topside MOSFET.
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 only by the R
DS(ON)
of the topside MOSFET
(when using the P-channel) and the resistance of the
inductor and current sense resistor.
The LTC1266 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 re-
duced to only 1mW at V
IN
= 5V (at I
OUT
= 0). Load currents
in Burst Mode
operation are typically 0mA to 500mA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
Figure 1. High Efficiency Step-Down Converter
LTC1266-3.3 Efficiency
LOAD CURRENT (A)
0.01
80
EFFICIENCY (%)
85
90
95
100
0.1 51
1266 TA02
V
IN
= 5V
0V = NORMAL
>1.5V = SHUTDOWN
N-CHANNEL
Si9410
+
C
IN
100µF
×2
L*
5µH
D2
MBR0530T1
R
SENSE
0.02Ω
100k
V
OUT
3.3V
5A
LOW BAT OUT
V
IN
4V TO 9V
I
TH
C
T
SGND
C
T
180pF
C
C
3300pF
R
C
470Ω
+
C
OUT
330µF
× 2
D1
MBRS130LT3
1266 TA01
BDRIVEBINH
PGND
N-CHANNEL
Si9410
V
IN
PWR V
IN
LB
OUT
LB
IN
PINV
LTC1266-3.3
SHDN
SENSE
+
TDRIVE
SENSE
–
1000pF
C
B
0.1µF
*TOKO 919AS-4R7M
LOW BAT IN
■
Notebook and Palmtop Computers
■
Portable Instruments
■
Cellular Telephones
■
DC Power Distribution Systems
■
GPS Systems
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1266
LTC1266 -3.3/LTC1266 -5
(Note 1)
Input Supply Voltage (Pins 2, 5)............... 20V to –0.3V
Continuous Output Current (Pins 1, 16) .............. 50mA
Sense Voltages (Pins 8, 9) ....................... 13V to –0.3V
SHDN Voltage (Pin 11) ............................. 12V to –0.3V
PINV, BINH, LB
IN
(Pins 3, 4, 13)................20V to –0.3V
LB
OUT
Output Current ........................................... 12mA
Operating Ambient Temperature Range...... 0°C to 70°C
Industrial Temperature Range ................ –40°C to 85°C
Extended Commercial
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
ORDER PART
NUMBER
LTC1266CS
LTC1266CS-3.3
LTC1266CS-5
LTC1266ACS
LTC1266IS
LTC1266IS-3.3
LTC1266IS-5
LTC1266AIS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
FB
Feedback Voltage V
IN
= 9V, I
LOAD
= 700mA, V
PINV
= V
PWR
= 14V,
Topside Switch = N-Ch
LTC1266ACS
● 1.252 1.265 1.278 V
LTC1266CS ● 1.210 1.265 1.290 V
I
FB
Feedback Current (LTC1266 Only) ● 0.2 1 µA
V
OUT
Regulated Output Voltage V
IN
= 9V, I
LOAD
= 700mA, V
PINV
= V
PWR
= 14V,
Topside Switch = N-Ch
LTC1266CS-3.3
● 3.23 3.33 3.43 V
LTC1266CS-5 ● 4.90 5.05 5.20 V
Output Ripple (Burst Mode Operation) I
LOAD
= 150mA 50 mV
P-P
∆V
OUT
Output Voltage Line Regulation I
LOAD
= 50mA
V
PINV
= 0V, Topside Switch = P-Ch, V
IN
= 7V to 12V – 40 0 40 mV
V
PINV
= V
PWR
, Topside Switch = N-Ch, V
IN
= 7V to 12V – 40 0 40 mV
Output Voltage Load Regulation 5mA < I
LOAD
< 2A, R
SENSE
= 0.05Ω
LTC1266-3.3 Burst Mode Operation Enabled, V
BINH
= 0V ● 40 65 mV
LTC1266-3.3 Burst Mode Operation Inhibited, V
BINH
= 2V ● 15 25 mV
LTC1266-5 Burst Mode Operation Enabled, V
BINH
= 0V ● 60 100 mV
LTC1266-5 Burst Mode Operation Inhibited, V
BINH
= 2V ● 25 40 mV
I
Q1
V
IN
Pin DC Supply Current (Note 3)
Normal Mode 3.5V < V
IN
< 18V 2.1 3.0 mA
Sleep Mode 3.5V < V
IN
< 18V 170 250 µA
Shutdown V
SHDN
= 2.1V, 3.5V < V
IN
< 18V 25 50 µA
I
Q2
PWR V
IN
DC Supply Current (Note 3)
Normal Mode 3.5V < PWR V
IN
< 18V 20 40 µA
Sleep Mode 3.5V < PWR V
IN
< 18V 1 5 µA
Shutdown V
SHDN
= 2.1V, 3.5V < PWR V
IN
< 18V 1 5 µA
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= V
BINH
= 0V unless otherwise noted.
T
JMAX
= 125°C,
θ
JA
= 110°C/W
Consult factory for Industrial and Military grade parts.
TOP VIEW
*FIXED OUTPUT VERSIONS
S PACKAGE
16-LEAD PLASTIC SO
TDRIVE
PWR V
IN
PINV
BINH
V
IN
C
T
I
TH
SENSE
–
BDRIVE
PGND
LB
OUT
LB
IN
SGND
SHDN
V
FB
(NC*)
SENSE
+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
3
LTC1266
LTC1266-3.3/LTC1266-5
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
SENSE 1
Current Sense Threshold V
BINH
= 0V
(Burst Mode Operation Enabled)
LTC1266 V
SENSE
–
= 3.3V, V
FB
= V
OUT
/2.64 + 25mV (Forced) 25 mV
V
SENSE
–
= 3.3V, V
FB
= V
OUT
/2.64 – 25mV (Forced) ● 135 155 175 mV
LTC1266-3.3 V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 135 155 175 mV
LTC1266-5 V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 135 155 175 mV
V
SENSE 2
Current Sense Threshold V
BINH
= 2.1V
(Burst Mode Operation Disabled)
LTC1266 V
SENSE
–
= 3.3V, V
FB
= V
OUT
/2.64 + 25mV (Forced) –20 mV
V
SENSE
–
= 3.3V, V
FB
= V
OUT
/2.64 – 25mV (Forced) ● 135 155 175 mV
LTC1266-3.3 V
SENSE
–
= V
OUT
+ 100mV (Forced) –20 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 135 155 175 mV
LTC1266-5 V
SENSE
–
= V
OUT
+ 100mV (Forced) –20 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 135 155 175 mV
V
SHDN
Shutdown Pin Threshold 0.6 0.8 2 V
I
SHDN
Shutdown Pin Input Current 0V < V
SHDN
< 8V, V
IN
= 16V 1.2 5 µA
I
PINV
Phase Invert Pin Input Current 0V < V
PINV
< 18V, V
IN
= 18V 0.2 1 µA
V
BINH
Burst Mode Operation V
IN
= 7V 0.8 1.2 2 V
Inhibit Pin Threshold
I
BINH
Burst Mode Operation 0V < V
BINH
< 18V, V
IN
= 18V 0.2 1 µA
Inhibit Pin Input Current
I
CT
C
T
Pin Discharge Current V
SENSE
+
= V
OUT
– 100mV, V
SENSE
–
= V
OUT
– 300mV 50 70 90 µA
V
OUT
= 0V 2 10 µA
t
OFF
Off-Time (Note 4) C
T
= 390pF, I
LOAD
= 700mA 4 5 6 µs
t
MAX
Max On-Time V
OUT
= 0V, V
IN
= 18V 60 µs
t
r
, t
f
Driver Output Transition Times (Note 7) C
L
= 3000pF (Pins 1, 16), V
IN
= 6V 100 200 ns
V
CLAMP
Output Voltage Clamp in V
BINH
= 2.1V
Burst Mode Operation Inhibit
LTC1266 Measured at V
FB
1.30 V
LTC1266-3.3 Measured at V
SENSE
–
3.43
V
LTC1266-5 Measured at V
SENSE
–
5.20 V
V
LBTRIP
Low-Battery Trip Point V
IN
= 5V 1.14 1.25 1.35 V
V
IN
= 12V 1.17 1.30 1.42 V
I
LBLEAK
Max Leakage Current Into Pin 14 V
LBOUT
= 18V, V
LBIN
= 2V 25 200 nA
I
LBSINK
Max Sink Current Into Pin 14 V
LBOUT
= 1V, V
LBIN
= 0V, 2.5V < V
IN
< 18V 1 8 mA
I
LBIN
Max Leakage Current Into Pin 13 V
LBIN
= 18V 0.2 1 µA
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= V
BINH
= 0V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
FB
Feedback Voltage V
IN
= 9V, I
LOAD
= 700mA, V
PINV
= V
PWR
= 14V,
Topside Switch = N-Ch
LTC1266AIS 1.246 1.265 1.290 V
LTC1266CS, LTC1266IS 1.210 1.265 1.290 V
V
OUT
Regulated Output Voltage V
IN
= 9V, I
LOAD
= 700mA, V
PINV
= V
PWR
= 14,
Topside Switch = N-Ch
LTC1266CS-3.3, LTC1266IS-3.3 3.23 3.33 3.43 V
LTC1266CS-5, LTC1266IS-5 4.90 5.05 5.20 V
–40°C < T
A
< 85°C (Note 5), V
IN
= 10V, unless otherwise noted.
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LTC1266CS-3.3#TRPBF

Mfr. #:
Buy LTC1266CS-3.3#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Syn Switching Reg Controller
Lifecycle:
New from this manufacturer.
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