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LTC1436ACGN-PLL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
1
LTC1436A
LTC1436A-PLL/LTC1437A
14367afb
High Efficiency Low Noise
Synchronous Step-Down
Switching Regulators
Figure 1. High Efficiency Step-Down Converter
■
Maintains Constant Frequency at Low Output Currents
■
Programmable Fixed Frequency (PLL Lockable)
■
Wide V
IN
Range: 3.5V to 36V Operation
■
Low Minimum On-Time (
≤
300ns) for High
Frequency, Low Duty Cycle Applications
■
Dual N-Channel MOSFET Synchronous Drive
■
Very Low Dropout Operation: 99% Duty Cycle
■
Low Dropout, 0.5A Linear Regulator for CPU I/O
or Low Noise Audio Supplies
■
Built-In Power-On Reset Timer
■
Programmable Soft Start
■
Low-Battery Detector
■
Remote Output Voltage Sense
■
Foldback Current Limiting (Optional)
■
Pin Selectable Output Voltage
■
Logic Controlled Micropower Shutdown: I
Q
< 25µA
■
Output Voltages from 1.19V to 9V
■
Available in 24-Lead Narrow SSOP and 28-Lead
SSOP Packages
The LTC
®
1436A/LTC1437A are synchronous step-down
switching regulator controllers that drive external
N-channel power MOSFETs in a phase lockable, fixed
frequency architecture. The Adaptive Power
TM
output stage
selectively drives two N-channel MOSFETs at frequencies
up to 400kHz while reducing switching losses to maintain
high efficiencies at low output currents.
An auxiliary 0.5A linear regulator using an external PNP
pass device provides a low noise, low dropout voltage
source. A secondary winding feedback control pin (SFB)
guarantees regulation regardless of the load on the main
output by forcing continuous operation.
An additional comparator is available for use as a low-
battery detector. A power-on reset timer (POR) is included
which generates a signal delayed by 65536/f
CLK
(300ms
typically) after the output is within 5% of the regulated
output voltage. Internal resistive dividers provide pin
selectable output voltages with remote sense capability.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V to 30V (36V maximum).
■
Notebook and Palmtop Computers, PDAs
■
Cellular Telephones and Wireless Modems
■
Portable Instruments
■
Battery-Operated Devices
■
DC Power Distribution Systems
C
OSC
RUN/SS
V
IN
V
PROG
+
+
+
V
IN
4.5V TO 22V
C
B
0.1µF
4.7µF
1000pF
LTC1436A
M1
Si4412DY
L1
4.7µH
R
SENSE
0.02Ω
C
OUT
100µF
6.3V
× 2
R1
35.7k
R2
102k
C
IN
22µF
35V
× 2
C
OSC
43pF
C
SS
0.1µF
C
C
510pF
100pF
R
C
10k
V
OUT
1.6V
5A
M2
Si4412DY
D1
MBRS140T3
SENSE
+
SENSE
–
SGND
M3
IRLML2803
D
B
CMDSH-3
TGL
TGS
SW
BOOST
BG
PGND
1436 F01
INTV
CC
I
TH
V
OSENSE
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adaptive Power is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6304066, 5929620, 6580258,
5705919, 5731731
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1436A
LTC1436-PLL-A/LTC1437A
14367afb
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Input Supply Voltage (V
IN
).........................36V to –0.3V
Topside Driver Supply Voltage (Boost) ......42V to – 0.3V
Switch Voltage (SW) ....................................36V to – 5V
EXTV
CC
Voltage .........................................10V to – 0.3V
POR, LBO Voltages .................................... 12V to – 0.3V
AUXFB Voltage ..........................................20V to –0.3V
AUXDR Voltage..........................................28V to – 0.3V
SENSE
+
, SENSE
–
,
V
OSENSE
Voltages ................. INTV
CC
+ 0.3V to –0.3V
V
PROG
Voltage .................................... INTV
CC
to –0.3V
PLL LPF, I
TH
Voltages ...............................2.7V to –0.3V
AUXON, PLLIN, SFB,
RUN/SS, LBI Voltages ..........................10V to –0.3V
Peak Driver Output Current < 10µs (TGL, BG).......... 2A
Peak Driver Output Current < 10µs (TGS) ......... 250mA
INTV
CC
Output Current ......................................... 50mA
Operating Temperature Range
LTC143XAC ............................................. 0°C to 70°C
LTC143XAI/LTC143XAE (Note 8) ...... – 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
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
I
IN
V
OSENSE
Feedback Current V
PROG
Pin Open (Note 3) 10 50 nA
V
OUT
Regulated Output Voltage (Note 3)
1.19V (Adjustable) Selected V
PROG
Pin Open ● 1.178 1.19 1.202 V
3.3V Selected V
PROG
= 0V ● 3.220 3.30 3.380 V
5V Selected V
PROG
= INTV
CC
● 4.900 5.00 5.100 V
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
RUN/SS
= 5V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
GN PACKAGE
24-LEAD PLASTIC SSOP
(150 MIL SSOP)
24
23
22
21
20
19
18
17
16
15
14
13
PLL LPF
C
OSC
RUN/SS
I
TH
SFB
SGND
V
PROG
V
OSENSE
SENSE
–
SENSE
+
AUXON
AUXFB
PLLIN
POR
BOOST
TGL
SW
TGS
V
IN
INTV
CC
BG
PGND
EXTV
CC
AUXDR
ORDER PART NUMBER
T
JMAX
= 125°C, θ
JA
= 95°C/W
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
PLL LPF
C
OSC
RUN/SS
LBO
LBI
I
TH
SFB
SGND
V
PROG
V
OSENSE
NC
SENSE
–
SENSE
+
AUXON
PLLIN
POR
BOOST
TGL
SW
TGS
V
IN
INTV
CC
DRV
CC
BG
PGND
EXTV
CC
AUXDR
AUXFB
ORDER PART NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
GN PACKAGE
24-LEAD PLASTIC SSOP
(150 MIL SSOP)
24
23
22
21
20
19
18
17
16
15
14
13
C
OSC
RUN/SS
LBO
LBI
I
TH
SFB
SGND
V
PROG
V
OSENSE
SENSE
–
SENSE
+
AUXON
POR
BOOST
TGL
SW
TGS
V
IN
INTV
CC
BG
PGND
EXTV
CC
AUXDR
AUXFB
T
JMAX
= 125°C, θ
JA
= 110°C/W
T
JMAX
= 125°C, θ
JA
= 110°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC1436ACGN
LTC1436AIGN
LTC1436AEGN
LTC1436ACGN-PLL
LTC1436AIGN-PLL
LTC1437ACG
LTC1437AIG
(Note 1)
3
LTC1436A
LTC1436A-PLL/LTC1437A
14367afb
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
LINEREG
Reference Voltage Line Regulation V
IN
= 3.6V to 20V (Note 3), V
PROG
Pin Open 0.002 0.01 %/V
V
LOADREG
Output Voltage Load Regulation I
TH
Sinking 5µA (Note 3) ● 0.5 0.8 %
I
TH
Sourcing 5µA (Note 3) ● –0.5 –0.8 %
V
SFB
Secondary Feedback Threshold V
SFB
Ramping Negative ● 1.16 1.19 1.22 V
I
SFB
Secondary Feedback Current V
SFB
= 1.5V –1 –2 µA
V
OVL
Output Overvoltage Lockout V
PROG
Pin Open 1.24 1.28 1.32 V
I
PROG
V
PROG
Input Current
0.5V > V
PROG
–3 –6 µA
INTV
CC
– 0.5V < V
PROG
< INTV
CC
3 6 µA
I
Q
Input DC Supply Current EXTV
CC
= 5V (Note 4)
Normal Mode 3.6V < V
IN
< 30V, V
AUXON
= 0V 280 µA
Shutdown V
RUN/SS
= 0V, 3.6V < V
IN
< 15V 16 25 µA
V
RUN/SS
RUN Pin Threshold ● 0.8 1.3 2 V
I
RUN/SS
Soft Start Current Source V
RUN/SS
= 0V 1.5 3 4.5 µA
∆V
SENSE(MAX)
Maximum Current Sense Threshold V
CM
= 0V, 5V, V
PROG
Pin Open 130 150 180 mV
t
ON(MIN)
Minimum On-Time Tested with Square Wave, SENSE
–
= 1.6V, 250 300 ns
∆V
SENSE
= 20mV (Note 7)
TGL Transition Time
TGL t
r
Rise Time C
LOAD
= 3000pF 50 150 ns
TGL t
f
Fall Time C
LOAD
= 3000pF 50 150 ns
TGS Transition Time
TGS t
r
Rise Time C
LOAD
= 500pF 90 200 ns
TGS t
f
Fall Time C
LOAD
= 500pF 50 150 ns
BG Transition Time
BG t
r
Rise Time C
LOAD
= 3000pF 50 150 ns
BG t
f
Fall Time C
LOAD
= 3000pF 40 150 ns
Internal V
CC
Regulator
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
< 30V, V
EXTVCC
= 4V ● 4.8 5.0 5.2 V
V
LDO
INT INTV
CC
Load Regulation I
INTVCC
= 15mA, V
EXTVCC
= 4V –0.2 – 1 %
V
LDO
EXT EXTV
CC
Voltage Drop I
INTVCC
= 15mA, V
EXTVCC
= 5V 130 230 mV
V
EXTVCC
EXTV
CC
Switchover Voltage I
INTVCC
= 15mA, V
EXTVCC
Ramping Positive ● 4.5 4.7 V
Oscillator and Phase-Locked Loop
f
OSC
Oscillator Frequency C
OSC
= 100pF, LTC1436 (Note 5), 112 125 138 kHz
LTC1436A-PLL/LTC1437A, V
PLLLPF
= 0V
VCO High LTC1436A-PLL/LTC1437A, V
PLLLPF
= 2.4V 200 240 kHz
R
PLLIN
PLL IN
Input Resistance 50 kΩ
I
PLLLPF
Phase Detector Output Current
Sinking Capability f
PLLIN
< f
OSC
10 15 20 µA
Sourcing Capability f
PLLIN
> f
OSC
10 15 20 µA
Power-On Reset
V
SATPOR
POR Saturation Voltage I
POR
= 1.6mA, V
OSENSE
= 1V, V
PROG
Pin Open 0.6 1 V
I
LPOR
POR Leakage V
POR
= 12V, V
OSENSE
= 1.2V, V
PROG
Pin Open 0.2 1 µA
V
THPOR
POR Trip Voltage V
PROG
Pin Open, V
OSENSE
Ramping Negative –11 – 7.5 – 4 %
t
DPOR
POR Delay V
PROG
Pin Open 65536 Cycles
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
RUN/SS
= 5V unless otherwise noted.
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LTC1436ACGN-PLL

Mfr. #:
Buy LTC1436ACGN-PLL
Manufacturer:
Analog Devices Inc.
Description:
IC REG CTRLR BUCK 24SSOP
Lifecycle:
New from this manufacturer.
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