LTC3200ES6-5 [Linear]
Low Noise, Regulated Charge Pump DC/DC Converters; 低噪音，调节电荷泵DC / DC转换器
| 型号： | LTC3200ES6-5 |
| 厂家： | 
Linear |
| 描述： | Low Noise, Regulated Charge Pump DC/DC Converters |
| 文件： | 总12页 (文件大小：193K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC3200/LTC3200-5
Low Noise, Regulated
Charge Pump DC/DC Converters
U
FEATURES
DESCRIPTIO
The LTC®3200/LTC3200-5 are low noise, constant fre-
quency switched capacitor voltage doublers. They pro-
duce a regulated output voltage from a 2.7V to 4.5V input
with up to 100mA of output current. Low external parts
count (one flying capacitor and two small bypass capaci-
tors at VIN and VOUT) make the LTC3200/LTC3200-5
ideally suited for small, battery-powered applications.
■
Low Noise Constant Frequency Operation
■
Output Current: 100mA
■
Available in 8-Pin MSOP (LTC3200) and Low
Profile (1mm) 6-Pin ThinSOTTM (LTC3200-5)
Packages
2MHz Switching Frequency
Fixed 5V ± 4% Output (LTC3200-5) or ADJ
VIN Range: 2.7V to 4.5V
Automatic Soft-Start Reduces Inrush Current
No Inductors
ICC <1µA in Shutdown
■
■
■
■
■
■
A new charge-pump architecture maintains constant
switching frequency to zero load and reduces both output
and input ripple. The LTC3200/LTC3200-5 have thermal
shutdown capability and can survive a continuous short-
circuit from VOUT to GND. Built-in soft-start circuitry
prevents excessive inrush current during start-up.
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APPLICATIO S
■
White LED Backlighting
Highswitchingfrequencyenablestheuseofsmallceramic
capacitors. A low current shutdown feature disconnects
the load from VIN and reduces quiescent current to <1µA.
■
Li-Ion Battery Backup Supplies
■
Local 3V to 5V Conversion
■
Smart Card Readers
■
PCMCIA Local 5V Supplies
The LTC3200 is available in an 8-pin MSOP package and
the LTC3200-5 is available in a 6-pin ThinSOT.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Output Ripple Voltage vs Load Current
40
Regulated 5V Output from a 2.7V to 4.5V Input
V
C
A
= 3V
FLY
= 25°C
IN
= 1µF
1µF
T
30
20
10
0
4
6
+
–
C
C
C
= 1µF
OUT
LTC3200-5
V
IN
2.7V TO 4.5V
1µF
5
2
3
1
V
V
= 5V ±4%
OUT
V
IN
OUT
I
UP TO 40mA, V ≥ 2.7V
OUT
OUT
IN
1µF
C
= 2.2µF
I
UP TO 100mA, V ≥ 3.1V
OUT
IN
GND
SHDN
OFF ON
ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ
OR TAIYO YUDEN JMK107BJ105MA
50
75
0
100
25
3200-5 TA01
OUTPUT CURRENT (mA)
3200 TA02
1
LTC3200/LTC3200-5
W W U W
ABSOLUTE AXI U RATI GS
(Note 1)
VOUT Short-Circuit Duration ............................. Indefinite
Operating Temperature Range (Note 3) .. –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
VIN to GND...................................................–0.3V to 6V
VOUT to GND .............................................–0.3V to 5.5V
VFB, SHDN to GND........................ –0.3V to (VIN + 0.3V)
IOUT (Note 2) ....................................................... 150mA
U
W
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PACKAGE/ORDER I FOR ATIO
ORDER PART
ORDER PART
TOP VIEW
NUMBER
NUMBER
TOP VIEW
+
+
C
V
C
1
2
3
4
8 V
OUT
V
1
6 C
5 V
4 C
OUT
7 FB
LTC3200EMS8
LTC3200ES6-5
IN
GND 2
–
IN
–
6 SHDN
5 SGND
PGND
SHDN 3
MS8 PACKAGE
8-LEAD PLASTIC MSOP
S6 PACKAGE
6-LEAD PLASTIC SOT-23
MS8 PART MARKING
LTNV
S6 PART MARKING
LTSH
TJMAX = 150°C, θJA = 200°C/W
TJMAX = 150°C, θJA = 230°C/W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range. Specifications are at TA = 25°C, VIN = 3.6V, CFLY = 1µF, CIN = 1µF, COUT = 1µF unless otherwise noted.
SYMBOL
PARAMETER
Input Voltage
Output Voltage
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
●
2.7
4.5
V
IN
2.7V ≤ V ≤ 4.5V, I
≤ 40mA
≤ 100mA
●
●
4.8
4.8
5
5
5.2
5.2
V
V
OUT
IN
OUT
OUT
3.1V ≤ V ≤ 4.5V, I
IN
I
I
Operating Supply Current
Shutdown Current
I
= 0mA, SHDN = V
IN
●
●
●
●
3.5
8
1
mA
µA
V
CC
SHDN
OUT
SHDN = 0V, V
= 0V
OUT
V
FB Voltage (LTC3200)
FB Input Current (LTC3200)
Output Ripple (LTC3200-5)
Efficiency (LTC3200-5)
Switching Frequency
1.217
–50
1.268
1.319
50
FB
I
V
V
V
= 1.4V
= 3V, I
= 3V, I
nA
FB
FB
IN
IN
V
= 100mA
= 50mA
30
80
2
mV
P-P
R
OUT
OUT
η
%
F
1
MHz
V
OSC
V
V
SHDN Input Threshold
SHDN Input Threshold
SHDN Input Current
●
●
●
●
1.3
IH
IL
0.4
1
V
I
I
t
SHDN = V
–1
–1
µA
µA
ms
Ω
IH
IL
IN
SHDN Input Current
SHDN = 0V
1
VOUT Turn-On Time
V
V
= 3V, I
= 3V, I
= 0mA, 10% to 90%
0.8
9.2
ON
IN
IN
OUT
OUT
R
Open-Loop Output Resistance
= 100mA, V = 0V (Note 4)
FB
OL
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Based on long term current density limitations.
Note 3: The LTC3200E/LTC3200E-5 are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 4: R ≡ (2 V – V )/I
OUT OUT
OL
IN
2
LTC3200/LTC3200-5
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LTC3200-5)
No Load Supply Current vs Supply
Voltage
Output Voltage vs Supply Voltage
Output Voltage vs Load Current
6
5
4
3
5.15
5.10
5.05
5.00
4.95
4.90
4.85
5.2
5.1
5.0
4.9
4.8
C
V
= C
= C
IN
= 1µF
C
I
= C
OUT
= C
= 1µF
FLY
IN
SHDN
OUT
= V
FLY
IN
OUT
C
A
= C
= C
= 1µF
FLY
IN
OUT
= 20mA
T
= 25°C
T
= 85°C
A
T
= 25°C
A
T
= 25°C
A
T
A
= –40°C
V
= 3.2V
IN
T
A
= 85°C
V
= 2.7V
IN
V
= 3V
100
IN
T
A
= –40°C
2.7
3.3
3.6
3.9
4.2
4.5
2.7
3.0
3.3
3.6
3.9
4.2
4.5
3.0
0
150
200
50
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
3200 F01
3200 G03
3200 G02
Oscillator Frequency vs Supply
Voltage
VSHDN Threshold Voltage vs
Supply Voltage
Efficiency vs Load Current
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
1.1
1.0
0.9
0.8
0.7
0.6
0.5
100
C
A
= C
= C = 1µF
FLY
IN
OUT
T
= 25°C
90
80
70
60
50
40
30
V
= 2.7V
IN
V
T
= 25°C
= 85°C
A
T
= –40°C
A
= 3.2V
IN
T
A
= 25°C
T
= –40°C
A
V
= 3.7V
IN
T
A
T
= 85°C
A
V
= 4.5V
IN
2.7
3.0
3.3
3.6
3.9
4.2
4.5
1
10
100
2.7
3.0
3.3
3.6
3.9
4.2
4.5
SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
3200 G06
3200 G04
3200 G05
Short Circuit Current vs Supply
Voltage
250
C
= 1µF
FLY
= 25°C
T
A
V
OUT
= 0V
200
150
100
2.7
3.0
3.3
3.6
3.9
4.2
4.5
SUPPLY VOLTAGE (V)
3200 G07
3
LTC3200/LTC3200-5
U W
(LTC3200-5) T = 25°C
TYPICAL PERFOR A CE CHARACTERISTICS
A
Load Transient Response
VOUT Soft-Start Ramp
Output Ripple
V
(AC
OUT
I
COUPLED)
20mV/DIV
OUT
V
L
SHDN
10mA TO
90mA
50mA/DIV
2V/DIV
C
= 1µF
V
OUT
C
= 3.3µF
= 10µF
OUT
1V/DIV
V
OUT
(AC
COUPLED)
50mV/DIV
C
OUT
V
IN
= 3V
200µs/DIV
V
I
= 3.3V
= 100mA
200ns/DIV
V
C
= 3.3V
10µs/DIV
IN
L
IN
32005 G08
32005 G09
= 1µF
32005 G10
OUT
U
U
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PIN FUNCTIONS
LTC3200/LTC3200-5
C+ (Pins 1/6): Flying Capacitor Positive Terminal.
FB(Pin 7): (LTC3200 Only) Feedback Input Pin. An output
divider should be connected from VOUT to FB to program
the output voltage.
VIN (Pins 2/5): Input Supply Voltage. VIN should be
bypassed with a 1µF to 4.7µF low ESR ceramic capacitor.
VOUT (Pins 8/1): Regulated Output Voltage. VOUT should
be bypassed with a 1µF to 4.7µF low ESR ceramic capaci-
tor as close as possible to the pin for best performance.
C– (Pins 3/4): Flying Capacitor Negative Terminal.
GND (Pins 4,5/2): Ground. Should be tied to a ground
plane for best performance.
SHDN (Pins 6/3): Active Low Shutdown Input. A low on
SHDN disables the LTC3200/LTC3200-5. SHDN must not
be allowed to float.
4
LTC3200/LTC3200-5
W
W
SI PLIFIED BLOCK DIAGRA S
LTC3200
SOFT-START
AND
SWITCH CONTROL
6
SHDN
V
8
7
OUT
FB
2MHz
OSCILLATOR
–
+
CHARGE
PUMP
+
1
3
C
V
2
IN
–
C
3200 BD
5
4
SGND
PGND
LTC3200-5
SOFT-START
AND
SWITCH CONTROL
3
SHDN
V
OUT
1
2MHz
OSCILLATOR
–
+
CHARGE
PUMP
+
6
4
C
V
IN
5
–
C
3200-5 BD
2
GND
5
LTC3200/LTC3200-5
U
OPERATIO
Operation (Refer to Simplified Block Diagrams)
ensure that VOUT is at 0V in shutdown on the adjustable
LTC3200ableedresistormaybeneededfromVOUTtoGND.
Typically 10k to 100k is acceptable.
TheLTC3200/LTC3200-5useaswitchedcapacitorcharge
pump to boost VIN to a regulated output voltage. Regula-
tion is achieved by sensing the output voltage through an
internal resistor divider (LTC3200-5) and modulating the
charge pump output current based on the error signal. A
2-phase nonoverlapping clock activates the charge pump
switches. The flying capacitor is charged from VIN on the
first phase of the clock. On the second phase of the clock
it is stacked in series with VIN and connected to VOUT. This
sequence of charging and discharging the flying capacitor
continues at a free running frequency of 2MHz (typ).
Soft-Start
The LTC3200/LTC3200-5 have built-in soft-start circuitry
to prevent excessive current flow at VIN during start-up.
The soft-start time is preprogrammed to approximately
1ms, so the start-up current will be primarily dependent
upon the output capacitor. The start-up input current can
be calculated with the expression:
VOUT
1ms
I
STARTUP = 2COUT
In shutdown mode all circuitry is turned off and the
LTC3200/LTC3200-5 draw only leakage current from the
VIN supply. Furthermore, VOUT is disconnected from VIN.
The SHDN pin is a CMOS input with a threshold voltage of
approximately 0.8V. The LTC3200/LTC3200-5 is in shut-
down when a logic low is applied to the SHDN pin. Since
the SHDN pin is a high impedance CMOS input it should
never be allowed to float. To ensure that its state is defined
it must always be driven with a valid logic level.
For example, with a 2.2µF output capacitor the start-up
input current of an LTC3200-5 will be approximately
22mA. If the output capacitor is 10µF then the start-up
input current will be about 100mA.
Programming the LTC3200 Output Voltage (FB Pin)
While the LTC3200-5 version has an internal resistive
divider to program the output voltage, the programmable
LTC3200 may be set to an arbitrary voltage via an external
resistive divider. Since it employs a voltage doubling
charge pump, it is not possible to achieve output voltages
greater than twice the available input voltage. Figure 1
shows the required voltage divider connection.
Short-Circuit/Thermal Protection
TheLTC3200/LTC3200-5havebuilt-inshort-circuitcurrent
limiting as well as overtemperature protection. During
short-circuit conditions, they will automatically limit their
outputcurrenttoapproximately225mA.Athighertempera-
tures, oriftheinputvoltageishighenoughtocauseexces-
sive self heating on chip, thermal shutdown circuitry will
shutdownthechargepumponcethejunctiontemperature
exceeds approximately 160°C. It will reenable the charge
pumponcethejunctiontemperaturedropsbacktoapproxi-
mately 155°C. The LTC3200/LTC3200-5 will cycle in and
out of thermal shutdown indefinitely without latch-up or
damage until the short-circuit on VOUT is removed.
The voltage divider ratio is given by the expression:
R1
VOUT
=
– 1
R2 1.268V
Typical values for total voltage divider resistance can
range from several kΩs up to 1MΩ.
V
8
7
OUT
V
OUT
FB
R1
R2
Shutdown Current
1.268V 1 +
(
)
R1
R2
C
OUT
Since the output voltage can go above the input voltage,
special circuitry is required to control internal logic.
Detection logic will draw an input current of 5µA when the
LTC3200 is in shutdown. However, this current will be
eliminated when the output voltage (VOUT) is at 0V. To
4
5
PGND
SGND
32005 F01
Figure 1. Programming the Adjustable LTC3200
6
LTC3200/LTC3200-5
U
OPERATIO
Maximum Available Output Current
Tantalumandaluminumcapacitorsarenotrecommended
because of their high ESR.
For the adjustable LTC3200, the maximum available out-
put current and voltage can be calculated from the effec-
tiveopen-loopoutputresistance,ROL,andeffectiveoutput
The value of COUT directly controls the amount of output
ripple for a given load current. Increasing the size of COUT
will reduce the output ripple at the expense of higher
minimum turn on time and higher start-up current. The
peak-to-peak output ripple is approximately given by the
expression:
voltage, 2VIN(MIN)
.
R
OL
+
–
+
2V
IN
I
V
OUT
OUT
–
IOUT
VRIPPLEP−P
2fOSC•COUT
32005 F02
Figure 2. Equivalent Open-Loop Circuit
Where fOSC is the LTC3200/LTC3200-5’s oscillator fre-
quency (typically 2MHz) and COUT is the output charge
storage capacitor.
From Figure 2 the available current is given by:
Boththestyleandvalueoftheoutputcapacitorcansignifi-
cantly affect the stability of the LTC3200/LTC3200-5. As
shown in the Block Diagrams, the LTC3200/LTC3200-5
usealinearcontrollooptoadjustthestrengthofthecharge
pump to match the current required at the output. The
error signal of this loop is stored directly on the output
charge storage capacitor. The charge storage capacitor
also serves to form the dominant pole for the control loop.
To prevent ringing or instability on the LTC3200-5 it is
importantfortheoutputcapacitortomaintainatleast0.47µF
of capacitance over all conditions. On the adjustable
LTC3200 the output capacitor should be at least 0.47µF ×
5V/VOUT to account for the alternate gain factor.
2VIN – VOUT
IOUT
=
ROL
Typical ROL values as a function of temperature are shown
in Figure 3.
11
I
C
V
= 100mA
OUT
FLY
FB
= 1µF
= 0V
10
9
V
IN
= 2.7V
V
= 3.3V
IN
Likewise excessive ESR on the output capacitor will tend
to degrade the loop stability of the LTC3200/LTC3200-5.
The closed loop output resistance of the LTC3200-5 is
designed to be 0.5Ω. For a 100mA load current change,
theoutputvoltagewillchangebyabout50mV.Iftheoutput
capacitor has 0.3Ω or more of ESR, the closed loop
frequency response will cease to roll off in a simple one
pole fashion and poor load transient response or instabil-
ity could result. Ceramic capacitors typically have excep-
tional ESR performance and combined with a tight board
layout should yield very good stability and load transient
performance.
8
–50
0
25
50
75
100
–25
AMBIENT TEMPERATURE (°C)
32005 • F03
Figure 3. Typical ROL vs Temperature
VIN, VOUT Capacitor Selection
The style and value of capacitors used with the LTC3200/
LTC3200-5determineseveralimportantparameterssuch
as regulator control loop stability, output ripple, charge
pump strength and minimum start-up time.
As the value of COUT controls the amount of output
ripple, the value of CIN controls the amount of ripple
present at the input pin (VIN). The input current to the
To reduce noise and ripple, it is recommended that low
ESR (<0.1Ω) ceramic capacitors be used for both CIN
and COUT. These capacitors should be 0.47µF or greater.
7
LTC3200/LTC3200-5
U
OPERATIO
LTC3200/LTC3200-5 will be relatively constant while the
charge pump is on either the input charging phase or the
output charging phase but will drop to zero during the
clock nonoverlap times. Since the nonoverlap time is
small (~25ns), these missing “notches” will result in only
a small perturbation on the input power supply line. Note
that a higher ESR capacitor such as tantalum will have
higher input noise due to the input current change times
the ESR. Therefore ceramic capacitors are again recom-
mended for their exceptional ESR performance.
2VIN– VOUT
IOUT
1
ROL(MIN)
≡
fOSC FLY
C
Where fOSC is the switching frequency (2MHz typ) and
CFLY is the value of the flying capacitor. The charge pump
will typically be weaker than the theoretical limit due to
additional switch resistance, however for very light load
applications the above expression can be used as a guide-
line in determining a starting capacitor value.
Ceramic Capacitors
Furtherinputnoisereductioncanbeachievedbypowering
the LTC3200/LTC3200-5 through a very small series in-
ductorasshowninFigure4.A10nHinductorwillrejectthe
fast current notches, thereby presenting a nearly constant
current load to the input power supply. For economy the
10nH inductor can be fabricated on the PC board with
about 1cm (0.4") of PC board trace.
Ceramiccapacitorsofdifferentmaterialslosetheircapaci-
tance with higher temperature and voltage at different
rates. For example, a capacitor made of X5R or X7R
material will retain most of its capacitance from – 40°C to
85°C whereas a Z5U or Y5V style capacitor will lose
considerable capacitance over that range. Z5U and Y5V
capacitors may also have a very poor voltage coefficient
causing them to lose 60% or more of their capacitance
when the rated voltage is applied. Therefore, when com-
paring different capacitors it is often more appropriate to
comparetheamountofachievablecapacitanceforagiven
casesizeratherthandiscussingthespecifiedcapacitance
value. For example, over rated voltage and temperature
conditions, a 1µF, 10V, Y5V ceramic capacitor in an 0603
case may not provide any more capacitance than a
0.22µF, 10V, X7R available in the same 0603 case. In fact
for most LTC3200/LTC3200-5 applications these capaci-
tors can be considered roughly equivalent . The capacitor
manufacturer’s data sheet should be consulted to deter-
mine what value of capacitor is needed to ensure the
desired capacitance at all temperatures and voltages.
10nH
V
IN
LTC3200/
LTC3200-5
V
IN
1µF
0.22µF
GND
32005 F02
Figure 4. 10nH Inductor Used for
Additional Input Noise Reduction
Flying Capacitor Selection
Warning: A polarized capacitor such as tantalum or
aluminum should never be used for the flying capacitor
sinceitsvoltagecanreverseuponstart-upoftheLTC3200/
LTC3200-5. Low ESR ceramic capacitors should always
be used for the flying capacitor.
Below is a list of ceramic capacitor manufacturers and
how to contact them:
The flying capacitor controls the strength of the charge
pump. In order to achieve the rated output current it is
necessary to have at least 0.68µF of capacitance for the
flying capacitor.
AVX
Kemet
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
Murata
Taiyo Yuden
Vishay
For very light load applications the flying capacitor may be
reduced to save space or cost. The theoretical minimum
output resistance of a voltage doubling charge pump is
given by:
8
LTC3200/LTC3200-5
U
OPERATIO
Power Efficiency
Layout Considerations
The power efficiency (η) of the LTC3200/LTC3200-5 is
similar to that of a linear regulator with an effective input
voltage of twice the actual input voltage. This occurs
because the input current for a voltage doubling charge
pumpisapproximatelytwicetheoutputcurrent.Inanideal
regulating voltage doubler the power efficiency would be
given by:
Due to its high switching frequency and the high transient
currents produced by the LTC3200/LTC3200-5, careful
board layout is necessary. A true ground plane and short
connectionstoallcapacitorswillimproveperformanceand
ensure proper regulation under all conditions. Figure 5
shows an example layout for the LTC3200-5.
Thermal Management
VOUT •IOUT
VIN •2IOUT
POUT
P
IN
VOUT
2VIN
η ≡
=
=
For higher input voltages and maximum output current
therecanbesubstantialpowerdissipationintheLTC3200/
LTC3200-5. If the junction temperature increases above
approximately 160°C the thermal shutdown circuitry will
automatically deactivate the output. To reduce the
maximum junction temperature, a good thermal connec-
tion to the PC board is recommended. Connecting the
GND pin (Pins 4/5 for LTC3200, Pin 2 for LTC3200-5) to
a ground plane, and maintaining a solid ground plane
underthedeviceontwolayersofthePCboardcanreduce
the thermal resistance of the package and PC board
considerably.
At moderate to high output power the switching losses
and quiescent current of the LTC3200/LTC3200-5 are
negligible and the expression above is valid. For example
with VIN = 3V, IOUT = 50mA and VOUT regulating to 5V the
measured efficiency is 80% which is in close agreement
with the theoretical 83.3% calculation.
Operation at VIN > 5V
LTC3200/LTC3200-5 will continue to operate with input
voltages somewhat above 5V. However, because of its
constant frequency nature, some charge due to internal
switching will be coupled to VOUT causing a slight upward
movement of the output voltage at very light loads. To
avoid an output overvoltage problem with high VIN, a
moderate standing load current of 1mA will help the
LTC3200/LTC3200-5 maintain exceptional line regula-
tion. This can be achieved with a 5k resistor from VOUT to
GND.
Derating Power at Higher Temperatures
To prevent an overtemperature condition in high power
applications Figure 6 should be used to determine the
maximumcombinationofambienttemperatureandpower
dissipation.
1.2
θ
T
= 175°C/W
JA
J
= 160°C
1.0
0.8
0.6
0.4
0.2
0
V
IN
V
OUT
1µF
1µF
1µF
GND
LTC3200-5
SHDN
–50
0
25
50
75
100
–25
32005 F03
AMBIENT TEMPERATURE (°C)
Figure 5. Recommended Layout
32005 • F06
Figure 6. Maximum Power Dissipation
vs Ambient Temperature
9
LTC3200/LTC3200-5
U
OPERATIO
The power dissipated in the LTC3200/LTC3200-5 should LTC3200-5 and the 8 pin MSOP adjustable LTC3200
always fall under the line shown for a given ambient which can be achieved from a printed circuit board layout
temperature. The power dissipated in the LTC3200/ with a solid ground plane and a good connection to the
LTC3200-5 is given by the expression:
ground pins of the LTC3200/LTC3200-5. Operation out-
side of this curve will cause the junction temperature to
exceed 160°C which may trigger the thermal shutdown
circuitry.
PD ≡ (2VIN – VOUT)IOUT
This derating curve assumes a maximum thermal
resistance, θJA, of 175°C/W for both the 6 pin ThinSOT
U
PACKAGE DESCRIPTIO
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 ± 0.004*
(3.00 ± 0.102)
0.043
(1.10)
MAX
0.034
(0.86)
REF
8
7
6
5
0.007
(0.18)
0° – 6° TYP
SEATING
0.118 ± 0.004**
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
PLANE
0.009 – 0.015
(0.22 – 0.38)
0.021 ± 0.006
(0.53 ± 0.015)
0.005 ± 0.002
(0.13 ± 0.05)
0.0256
(0.65)
BSC
1
2
3
4
MSOP (MS8) 1100
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
10
LTC3200/LTC3200-5
U
PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic ThinSOT-23
(LTC DWG # 05-08-1634)
2.80 – 3.10
(.110 – .118)
(NOTE 3)
SOT-23
(Original)
SOT-23
(ThinSOT)
.90 – 1.45
1.00 MAX
A
A1
A2
L
(.035 – .057)
(.039 MAX)
.00 – 0.15
(.00 – .006)
.01 – .10
(.0004 – .004)
2.60 – 3.00
1.50 – 1.75
(.102 – .118) (.059 – .069)
(NOTE 3)
.90 – 1.30
(.035 – .051)
.80 – .90
(.031 – .035)
PIN ONE ID
.35 – .55
(.014 – .021)
.30 – .50 REF
(.012 – .019 REF)
.95
(.037)
REF
.25 – .50
(.010 – .020)
(6PLCS, NOTE 2)
.20
(.008)
A2
A
DATUM ‘A’
1.90
(.074)
REF
L
.09 – .20
(.004 – .008)
(NOTE 2)
A1
S6 SOT-23 0401
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
(INCHES)
3. DRAWING NOT TO SCALE
4. DIMENSIONS ARE INCLUSIVE OF PLATING
5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
6. MOLD FLASH SHALL NOT EXCEED .254mm
7. PACKAGE EIAJ REFERENCE IS:
SC-74A (EIAJ) FOR ORIGINAL
JEDEL MO-193 FOR THIN
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LTC3200/LTC3200-5
U
TYPICAL APPLICATIO S
White or Blue LED Driver with LED Current Control
1µF
1
3
+
–
C
C
UP TO 6 LEDS
2
8
V
V
IN
OUT
3V TO 4.4V
Li-Ion
BATTERY
1µF
1µF
LTC3200
7
5
4
FB
82Ω
82Ω
82Ω
82Ω
82Ω
82Ω
SGND
PGND
6
SHDN
ON OFF
32005 TA04
(APPLY PWM WAVEFORM FOR
ADJUSTABLE BRIGHTNESS CONTROL)
V
SHDN
t
Lithium-Ion Battery to 5V White or Blue LED Driver
1µF
4
6
–
+
C
C
V
DRIVE UP TO 5 LEDS
5
3
1
2
V
IN
OUT
3V TO 4.4V
Li-Ion
BATTERY
100Ω
100Ω
100Ω
100Ω
100Ω
1µF
1µF
LTC3200-5
SHDN
GND
ON OFF
(APPLY PWM WAVEFORM FOR
ADJUSTABLE BRIGHTNESS CONTROL)
V
SHDN
3200-5 TA03
t
USB Port to Regulated 5V Power Supply
1µF
4
6
5
3
1
LTC3200-5
V
OUT
1µF
1µF
5V ±4%
50mA
2
32005 TA05
RELATED PARTS
PART NUMBER
LTC1682/-3.3/-5
LTC1751/-3.3/-5
LTC1754-3.3/-5
LTC1928-5
DESCRIPTION
COMMENTS
MS8 and SO-8 Packages , I
Doubler Charge Pumps with Low Noise LDO
Doubler Charge Pumps
= 80mA, Output Noise = 60µV
RMS
OUT
V
OUT
= 5V at 100mA; V
= 3.3V at 80mA; ADJ; MSOP Packages
OUT
Doubler Charge Pumps with Shutdown
Doubler Charge Pump with Low Noise LDO
ThinSOT Package; I = 13µA; I
= 50mA
Q
OUT
ThinSOT Output Noise = 60µV
; V
= 5V; V = 2.7V to 4V
RMS OUT IN
32005f LT/TP 0501 2K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2000
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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