LINER LTC3200-5 Low noise, regulated charge pump dc/dc converter Datasheet

LTC3200/LTC3200-5
Low Noise, Regulated
Charge Pump DC/DC Converters
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FEATURES
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DESCRIPTIO
The LTC®3200/LTC3200-5 are low noise, constant frequency switched capacitor voltage doublers. They produce 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 capacitors 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 shortcircuit from VOUT to GND. Built-in soft-start circuitry
prevents excessive inrush current during start-up.
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APPLICATIO S
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White LED Backlighting
Li-Ion Battery Backup Supplies
Local 3V to 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
High switching frequency enables the use of small ceramic
capacitors. A low current shutdown feature disconnects
the load from VIN and reduces quiescent current to <1µA.
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.
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TYPICAL APPLICATIO
Output Ripple Voltage vs Load Current
Regulated 5V Output from a 2.7V to 4.5V Input
40
VIN = 3V
CFLY = 1µF
TA = 25°C
4
VIN
2.7V TO 4.5V
1µF
5
2
3
OFF ON
6
C+
C–
LTC3200-5
VIN
VOUT
1
1µF
GND
VOUT = 5V ±4%
IOUT UP TO 40mA, VIN ≥ 2.7V
IOUT UP TO 100mA, VIN ≥ 3.1V
OUTPUT RIPPLE (mVP-P)
1µF
30
COUT = 1µF
20
COUT = 2.2µF
10
SHDN
ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ
OR TAIYO YUDEN JMK107BJ105MA
0
3200-5 TA01
0
50
75
25
OUTPUT CURRENT (mA)
100
3200 TA02
1
LTC3200/LTC3200-5
W W
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ABSOLUTE
AXI U RATI GS
(Note 1)
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
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
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PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
C+
VIN
C–
PGND
1
2
3
4
8
7
6
5
VOUT
FB
SHDN
SGND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
LTC3200EMS8
ORDER PART
NUMBER
TOP VIEW
VOUT 1
6 C+
GND 2
5 VIN
SHDN 3
4 C–
LTC3200ES6-5
MS8 PART MARKING
S6 PACKAGE
6-LEAD PLASTIC SOT-23
S6 PART MARKING
LTNV
TJMAX = 150°C, θJA = 230°C/W
LTSH
TJMAX = 150°C, θJA = 200°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
VIN
Input Voltage
VOUT
Output Voltage
ICC
CONDITIONS
MIN
TYP
MAX
UNITS
4.5
V
5
5
5.2
5.2
V
V
3.5
8
mA
1
µA
●
2.7
2.7V ≤ VIN ≤ 4.5V, IOUT ≤ 40mA
3.1V ≤ VIN ≤ 4.5V, IOUT ≤ 100mA
●
●
4.8
4.8
Operating Supply Current
IOUT = 0mA, SHDN = VIN
●
ISHDN
Shutdown Current
SHDN = 0V, VOUT = 0V
●
VFB
FB Voltage (LTC3200)
IFB
FB Input Current (LTC3200)
VFB = 1.4V
VR
Output Ripple (LTC3200-5)
VIN = 3V, IOUT = 100mA
η
Efficiency (LTC3200-5)
VIN = 3V, IOUT = 50mA
FOSC
Switching Frequency
VIH
SHDN Input Threshold
VIL
SHDN Input Threshold
IIH
SHDN Input Current
SHDN = VIN
●
–1
IIL
SHDN Input Current
SHDN = 0V
●
–1
tON
VOUT Turn-On Time
VIN = 3V, IOUT = 0mA, 10% to 90%
0.8
ms
ROL
Open-Loop Output Resistance
VIN = 3V, IOUT = 100mA, VFB = 0V (Note 4)
9.2
Ω
1.217
●
–50
1.268
1.319
V
50
nA
30
1
●
mVP-P
80
%
2
MHz
1.3
V
●
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.
2
●
0.4
V
1
µA
1
µA
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: ROL ≡ (2 VIN – VOUT)/IOUT
LTC3200/LTC3200-5
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TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Supply Voltage
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
TA = 25°C
5.00
CIN = COUT = CFLY = 1µF
VSHDN = VIN
CIN = COUT = CFLY = 1µF
TA = 25°C
TA = 85°C
5.05
6
5.2
CIN = COUT = CFLY = 1µF
IOUT = 20mA
5.10
No Load Supply Current vs Supply
Voltage
Output Voltage vs Load Current
TA = – 40°C
4.95
SUPPLY CURRENT (mA)
5.15
(LTC3200-5)
5.1
5.0
VIN = 3.2V
VIN = 2.7V
VIN = 3V
4.9
TA = 25°C
5
TA = 85°C
4
TA = – 40°C
4.90
4.85
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
4.8
4.5
3
100
150
50
LOAD CURRENT (mA)
0
200
3200 F01
2.7
100
1.0
90
CIN = COUT = CFLY = 1µF
TA = 25°C
2.0
TA = 85°C
1.8
1.6
1.4
EFFICIENCY (%)
THRESHOLD VOLTAGE (V)
TA = – 40°C
TA = 25°C
0.8
TA = 85°C
0.7
1.0
2.7
0.6
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
4.5
VIN = 2.7V
VIN = 3.2V
70
VIN = 3.7V
60
VIN = 4.5V
50
40
1.2
30
0.5
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
3200 G04
4.5
3200 G05
1
10
LOAD CURRENT (mA)
100
3200 G06
Short Circuit Current vs Supply
Voltage
250
OUTPUT CURRENT (mA)
OSCILLATOR FREQUENCY (MHz)
2.2
80
TA = – 40°C
0.9
4.5
Efficiency vs Load Current
1.1
2.8
TA = 25°C
4.2
3200 G03
VSHDN Threshold Voltage vs
Supply Voltage
3.0
2.4
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
3200 G02
Oscillator Frequency vs Supply
Voltage
2.6
3.0
CFLY = 1µF
TA = 25°C
VOUT = 0V
200
150
100
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
4.5
3200 G07
3
LTC3200/LTC3200-5
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TYPICAL PERFOR A CE CHARACTERISTICS
VOUT Soft-Start Ramp
(LTC3200-5) TA = 25°C
Load Transient Response
Output Ripple
VSHDN
2V/DIV
VOUT (AC
COUPLED)
20mV/DIV
COUT = 1µF
VOUT
1V/DIV
COUT = 3.3µF
IL
10mA TO
90mA
50mA/DIV
VOUT
(AC
COUPLED)
50mV/DIV
COUT = 10µF
VIN = 3V
200µs/DIV
32005 G08
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PIN FUNCTIONS
VIN = 3.3V
IL = 100mA
32005 G09
VIN = 3.3V
COUT = 1µF
10µs/DIV
32005 G10
LTC3200/LTC3200-5
C + (Pins 1/6): Flying Capacitor Positive Terminal.
VIN (Pins 2/5): Input Supply Voltage. VIN should be
bypassed with a 1µF to 4.7µF low ESR ceramic capacitor.
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
200ns/DIV
FB (Pin 7): (LTC3200 Only) Feedback Input Pin. An output
divider should be connected from VOUT to FB to program
the output voltage.
VOUT (Pins 8/1): Regulated Output Voltage. VOUT should
be bypassed with a 1µF to 4.7µF low ESR ceramic capacitor as close as possible to the pin for best performance.
LTC3200/LTC3200-5
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SI PLIFIED BLOCK DIAGRA S
LTC3200
SOFT-START
AND
SWITCH CONTROL
VOUT
8
FB
7
6
SHDN
1
C+
3
C–
2MHz
OSCILLATOR
–
+
CHARGE
PUMP
VIN
2
5
4
SGND
PGND
3200 BD
LTC3200-5
SOFT-START
AND
SWITCH CONTROL
VOUT
3
SHDN
6
C+
4
C–
1
2MHz
OSCILLATOR
–
+
CHARGE
PUMP
VIN
5
2
3200-5 BD
GND
5
LTC3200/LTC3200-5
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OPERATIO
Operation (Refer to Simplified Block Diagrams)
The LTC3200/LTC3200-5 use a switched capacitor charge
pump to boost VIN to a regulated output voltage. Regulation 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).
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 shutdown 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.
Short-Circuit/Thermal Protection
The LTC3200/LTC3200-5 have built-in short-circuit current
limiting as well as overtemperature protection. During
short-circuit conditions, they will automatically limit their
output current to approximately 225mA. At higher temperatures, or if the input voltage is high enough to cause excessive self heating on chip, thermal shutdown circuitry will
shut down the charge pump once the junction temperature
exceeds approximately 160°C. It will reenable the charge
pump once the junction temperature drops back to approximately 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.
Shutdown Current
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
ensure that VOUT is at 0V in shutdown on the adjustable
LTC3200 a bleed resistor may be needed from VOUT to GND.
Typically 10k to 100k is acceptable.
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:
ISTARTUP = 2C OUT
VOUT
1ms
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.
The voltage divider ratio is given by the expression:
R1
V
= OUT – 1
R2 1.268V
Typical values for total voltage divider resistance can
range from several kΩs up to 1MΩ.
VOUT
8
R1
FB
7
( )
VOUT
1.268V 1 + R1
R2
COUT
R2
PGND
SGND
4
5
32005 F01
Figure 1. Programming the Adjustable LTC3200
6
LTC3200/LTC3200-5
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OPERATIO
Maximum Available Output Current
For the adjustable LTC3200, the maximum available output current and voltage can be calculated from the effective open-loop output resistance, ROL, and effective output
voltage, 2VIN(MIN).
ROL
+
–
+
2VIN
IOUT
VRIPPLEP − P ≅
32005 F02
Figure 2. Equivalent Open-Loop Circuit
From Figure 2 the available current is given by:
2VIN – VOUT
ROL
Typical ROL values as a function of temperature are shown
in Figure 3.
OUTPUT RESISTANCE (Ω)
11
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:
VOUT
–
IOUT =
Tantalum and aluminum capacitors are not recommended
because of their high ESR.
IOUT = 100mA
CFLY = 1µF
VFB = 0V
10
VIN = 2.7V
VIN = 3.3V
9
IOUT
2fOSC • C OUT
Where fOSC is the LTC3200/LTC3200-5’s oscillator frequency (typically 2MHz) and COUT is the output charge
storage capacitor.
Both the style and value of the output capacitor can significantly affect the stability of the LTC3200/LTC3200-5. As
shown in the Block Diagrams, the LTC3200/LTC3200-5
use a linear control loop to adjust the strength of the charge
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
important for the output capacitor to maintain at least 0.47µF
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.
The style and value of capacitors used with the LTC3200/
LTC3200-5 determine several important parameters such
as regulator control loop stability, output ripple, charge
pump strength and minimum start-up time.
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,
the output voltage will change by about 50mV. If the output
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 instability could result. Ceramic capacitors typically have exceptional ESR performance and combined with a tight board
layout should yield very good stability and load transient
performance.
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.
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
8
–50
75
0
25
50
–25
AMBIENT TEMPERATURE (°C)
100
32005 • F03
Figure 3. Typical ROL vs Temperature
VIN, VOUT Capacitor Selection
7
LTC3200/LTC3200-5
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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 recommended for their exceptional ESR performance.
Further input noise reduction can be achieved by powering
the LTC3200/LTC3200-5 through a very small series inductor as shown in Figure 4. A 10nH inductor will reject the
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.
10nH
VIN
VIN
0.22µF
1µF
LTC3200/
LTC3200-5
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
since its voltage can reverse upon start-up of the LTC3200/
LTC3200-5. Low ESR ceramic capacitors should always
be used for the flying capacitor.
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.
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
ROL(MIN) ≡
2VIN – VOUT
IOUT
≅
1
fOSCC FLY
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 guideline in determining a starting capacitor value.
Ceramic Capacitors
Ceramic capacitors of different materials lose their capacitance 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 comparing different capacitors it is often more appropriate to
compare the amount of achievable capacitance for a given
case size rather than discussing the specified capacitance
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 capacitors can be considered roughly equivalent . The capacitor
manufacturer’s data sheet should be consulted to determine what value of capacitor is needed to ensure the
desired capacitance at all temperatures and voltages.
Below is a list of ceramic capacitor manufacturers and
how to contact them:
AVX
www.avxcorp.com
Kemet
www.kemet.com
Murata
www.murata.com
Taiyo Yuden
www.t-yuden.com
Vishay
www.vishay.com
LTC3200/LTC3200-5
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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
pump is approximately twice the output current. In an ideal
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
connections to all capacitors will improve performance and
ensure proper regulation under all conditions. Figure 5
shows an example layout for the LTC3200-5.
Thermal Management
VOUT • IOUT VOUT
P
η ≡ OUT =
=
2VIN
PIN
VIN • 2IOUT
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 regulation. This can be achieved with a 5k resistor from VOUT to
GND.
For higher input voltages and maximum output current
there can be substantial power dissipation in the LTC3200/
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 connection 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
under the device on two layers of the PC board can reduce
the thermal resistance of the package and PC board
considerably.
Derating Power at Higher Temperatures
To prevent an overtemperature condition in high power
applications Figure 6 should be used to determine the
maximum combination of ambient temperature and power
dissipation.
1.2
θJA = 175°C/W
TJ = 160°C
VIN
VOUT
1µF
1µF
GND
1µF
POWER DISSIPATION (W)
1.0
0.8
0.6
0.4
0.2
SHDN
LTC3200-5
0
–50
32005 F03
Figure 5. Recommended Layout
0
25
50
75
–25
AMBIENT TEMPERATURE (°C)
100
32005 • F06
Figure 6. Maximum Power Dissipation
vs Ambient Temperature
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LTC3200/LTC3200-5
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OPERATIO
The power dissipated in the LTC3200/LTC3200-5 should
always fall under the line shown for a given ambient
temperature. The power dissipated in the LTC3200/
LTC3200-5 is given by the expression:
PD ≡ (2VIN – VOUT)IOUT
This derating curve assumes a maximum thermal
resistance, θJA, of 175°C/W for both the 6 pin ThinSOT
LTC3200-5 and the 8 pin MSOP adjustable LTC3200
which can be achieved from a printed circuit board layout
with a solid ground plane and a good connection to the
ground pins of the LTC3200/LTC3200-5. Operation outside of this curve will cause the junction temperature to
exceed 160°C which may trigger the thermal shutdown
circuitry.
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PACKAGE DESCRIPTIO
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.043
(1.10)
MAX
0.007
(0.18)
0.034
(0.86)
REF
8
7 6
5
0° – 6° TYP
0.021 ± 0.006
(0.53 ± 0.015)
SEATING
PLANE
0.009 – 0.015
(0.22 – 0.38)
0.0256
(0.65)
BSC
0.005 ± 0.002
(0.13 ± 0.05)
* 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
0.118 ± 0.004*
(3.00 ± 0.102)
0.118 ± 0.004**
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
1
2 3
4
MSOP (MS8) 1100
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)
A
.90 – 1.45
(.035 – .057)
1.00 MAX
(.039 MAX)
A1
.00 – 0.15
(.00 – .006)
.01 – .10
(.0004 – .004)
A2
.90 – 1.30
(.035 – .051)
.80 – .90
(.031 – .035)
L
.35 – .55
(.014 – .021)
.30 – .50 REF
(.012 – .019 REF)
2.60 – 3.00
(.102 – .118)
1.50 – 1.75
(.059 – .069)
(NOTE 3)
PIN ONE ID
.95
(.037)
REF
.25 – .50
(.010 – .020)
(6PLCS, NOTE 2)
.20
(.008)
A
DATUM ‘A’
L
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
(INCHES)
.09 – .20
(.004 – .008)
(NOTE 2)
A2
1.90
(.074)
REF
A1
S6 SOT-23 0401
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LTC3200/LTC3200-5
U
TYPICAL APPLICATIO S
White or Blue LED Driver with LED Current Control
1µF
1
2
3V TO 4.4V
Li-Ion
BATTERY
C
3
+
C–
VOUT
VIN
1µF
1µF
LTC3200
FB
ON OFF
6
SGND
SHDN
UP TO 6 LEDS
8
PGND
7
5
82Ω
82Ω
82Ω
82Ω
82Ω
82Ω
4
32005 TA04
(APPLY PWM WAVEFORM FOR
ADJUSTABLE BRIGHTNESS CONTROL)
VSHDN
t
Lithium-Ion Battery to 5V White or Blue LED Driver
1µF
4
5
3V TO 4.4V
Li-Ion
BATTERY
1µF
VIN
6
C+ 1
VOUT
DRIVE UP TO 5 LEDS
SHDN
(APPLY PWM WAVEFORM FOR
ADJUSTABLE BRIGHTNESS CONTROL)
100Ω
1µF
LTC3200-5
3
ON OFF
C–
GND
100Ω
100Ω
100Ω
100Ω
2
VSHDN
3200-5 TA03
t
USB Port to Regulated 5V Power Supply
1µF
4
6
5
3
1
LTC3200-5
1µF
1µF
VOUT
5V ±4%
50mA
2
32005 TA05
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1682/-3.3/-5
Doubler Charge Pumps with Low Noise LDO
MS8 and SO-8 Packages , IOUT = 80mA, Output Noise = 60µVRMS
LTC1751/-3.3/-5
Doubler Charge Pumps
VOUT = 5V at 100mA; VOUT = 3.3V at 80mA; ADJ; MSOP Packages
LTC1754-3.3/-5
Doubler Charge Pumps with Shutdown
ThinSOT Package; IQ = 13µA; IOUT = 50mA
LTC1928-5
Doubler Charge Pump with Low Noise LDO
ThinSOT Output Noise = 60µVRMS; VOUT = 5V; VIN = 2.7V to 4V
12
Linear Technology Corporation
32005f LT/TP 0501 2K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
 LINEAR TECHNOLOGY CORPORATION 2000
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