LTC3200-5 Linear Technology, LTC3200-5 Datasheet

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LTC3200-5

Manufacturer Part Number
LTC3200-5
Description
Regulated Charge Pump DC/DC Converters
Manufacturer
Linear Technology
Datasheet
www.DataSheet4U.com
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Low Noise Constant Frequency Operation
Output Current: 100mA
Available in 8-Pin MSOP (LTC3200) and Low
Profile (1mm) 6-Pin ThinSOT
Packages
2MHz Switching Frequency
Fixed 5V 4% Output (LTC3200-5) or ADJ
V
Automatic Soft-Start Reduces Inrush Current
No Inductors
I
White LED Backlighting
Li-Ion Battery Backup Supplies
Local 3V to 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
CC
IN
<1 A in Shutdown
Range: 2.7V to 4.5V
2.7V TO 4.5V
V
Regulated 5V Output from a 2.7V to 4.5V Input
IN
OFF
ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ
OR TAIYO YUDEN JMK107BJ105MA
1 F
ON
U
5
2
3
V
GND
SHDN
4
LTC3200-5
C
IN
1 F
V
OUT
C
+
6
TM
U
1
1 F
(LTC3200-5)
V
I
I
OUT
OUT
OUT
UP TO 40mA, V
UP TO 100mA, V
Charge Pump DC/DC Converters
= 5V 4%
IN
IN
3200-5 TA01
2.7V
3.1V
DESCRIPTIO
The LTC
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 V
ideally suited for small, battery-powered applications.
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 V
prevents excessive inrush current during start-up.
High switching frequency enables the use of small ceramic
capacitors. A low current shutdown feature disconnects
the load from V
The LTC3200 is available in an 8-pin MSOP package and
the LTC3200-5 is available in a 6-pin ThinSOT.
ThinSOT is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
3200/LTC3200-5 are low noise, constant fre-
IN
Low Noise, Regulated
and V
40
30
20
10
Output Ripple Voltage vs Load Current
0
0
OUT
IN
V
C
T
LTC3200/LTC3200-5
A
IN
FLY
and reduces quiescent current to <1 A.
= 25 C
= 3V
OUT
U
= 1 F
to GND. Built-in soft-start circuitry
25
OUTPUT CURRENT (mA)
) make the LTC3200/LTC3200-5
C
OUT
50
= 1 F
C
OUT
= 2.2 F
75
3200 TA02
100
1

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LTC3200-5 Summary of contents

Page 1

... High switching frequency enables the use of small ceramic capacitors. A low current shutdown feature disconnects the load from V The LTC3200 is available in an 8-pin MSOP package and the LTC3200-5 is available in a 6-pin ThinSOT. ThinSOT is a trademark of Linear Technology Corporation ...

Page 2

... V Output Voltage OUT I Operating Supply Current CC I Shutdown Current SHDN V FB Voltage (LTC3200 Input Current (LTC3200 Output Ripple (LTC3200-5) R Efficiency (LTC3200-5) F Switching Frequency OSC V SHDN Input Threshold IH V SHDN Input Threshold IL I SHDN Input Current IH I SHDN Input Current ...

Page 3

... SUPPLY VOLTAGE (V) Short Circuit Current vs Supply Voltage 250 FLY OUT 200 150 100 2.7 3.0 3.3 3.6 3.9 SUPPLY VOLTAGE (V) LTC3200/LTC3200-5 (LTC3200-5) No Load Supply Current vs Supply Voltage OUT FLY SHDN – ...

Page 4

... F to 4.7 F 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 Output Ripple V (AC OUT ...

Page 5

... OUT LTC3200 SOFT-START SWITCH CONTROL 8 2MHz 7 OSCILLATOR – + CHARGE PUMP SGND PGND LTC3200-5 SOFT-START SWITCH CONTROL 1 2MHz OSCILLATOR – + CHARGE PUMP 5 2 GND LTC3200/LTC3200-5 6 SHDN AND + 1 C – 3200 BD 3 SHDN AND + C 6 – 3200 ...

Page 6

... C. It will reenable the charge pump once the junction temperature drops back to approxi- 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 V ...

Page 7

... The charge storage capacitor also serves to form the dominant pole for the control loop. To prevent ringing or instability on the LTC3200 important for the output capacitor to maintain at least 0. capacitance over all conditions. On the adjustable LTC3200 the output capacitor should be at least 0 ...

Page 8

... ESR. Therefore ceramic capacitors are again recom- mended for their exceptional ESR performance. Further input noise reduction can be achieved by powering the LTC3200/LTC3200-5 through a very small series in- ductor 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 ...

Page 9

... PC board is recommended. Connecting the GND pin (Pins 4/5 for LTC3200, Pin 2 for LTC3200- 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 ...

Page 10

... DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 10 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 out- ...

Page 11

... Plastic ThinSOT-23 (LTC DWG # 05-08-1634) 2.60 – 3.00 1.50 – 1.75 (.102 – .118) (.059 – .069) (NOTE 3) .95 (.037) REF A2 A .09 – .20 (.004 – .008) (NOTE 2) LTC3200/LTC3200-5 2.80 – 3.10 (.110 – .118) (NOTE 3) PIN ONE ID .25 – .50 (.010 – .020) (6PLCS, NOTE 2) 1.90 (.074) A1 REF S6 SOT-23 0401 11 ...

Page 12

... OUT 100 1 F LTC3200 SHDN GND V SHDN t USB Port to Regulated 5V Power Supply LTC3200 COMMENTS MS8 and SO-8 Packages , 100mA; V OUT ThinSOT Package; I ThinSOT Output Noise = LEDS 32005 TA04 DRIVE LEDS ...

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