LTC3200/LTC3200-5
Low Noise, Regulated
Charge Pump DC/DC Converters
FEATURES
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DESCRIPTIO
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Low Noise Constant Frequency Operation
Output Current: 100mA
Available in 8-Pin MSOP (LTC3200) and Low
Profile (1mm) 6-Pin ThinSOT
TM
(LTC3200-5)
Packages
2MHz Switching Frequency
Fixed 5V
±
4% Output (LTC3200-5) or ADJ
V
IN
Range: 2.7V to 4.5V
Automatic Soft-Start Reduces Inrush Current
No Inductors
I
CC
<1µA in Shutdown
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 V
IN
and V
OUT
) make the LTC3200/LTC3200-5
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
OUT
to GND. Built-in soft-start circuitry
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
IN
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.
APPLICATIO S
s
s
s
s
s
White LED Backlighting
Li-Ion Battery Backup Supplies
Local 3V to 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
TYPICAL APPLICATIO
Output Ripple Voltage vs Load Current
Regulated 5V Output from a 2.7V to 4.5V Input
1µF
OUTPUT RIPPLE (mV
P-P
)
40
V
IN
= 3V
C
FLY
= 1µF
T
A
= 25°C
30
C
OUT
= 1µF
20
4
6
V
IN
2.7V TO 4.5V
1µF
5
2
3
C
+
C
–
LTC3200-5
V
IN
GND
SHDN
V
OUT
1
1µF
V
OUT
= 5V
±4%
I
OUT
UP TO 40mA, V
IN
≥
2.7V
I
OUT
UP TO 100mA, V
IN
≥
3.1V
10
OFF ON
ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ
OR TAIYO YUDEN JMK107BJ105MA
0
3200-5 TA01
0
U
C
OUT
= 2.2µF
50
75
25
OUTPUT CURRENT (mA)
100
3200 TA02
U
U
1
LTC3200/LTC3200-5
ABSOLUTE
AXI U RATI GS
V
IN
to GND ...................................................– 0.3V to 6V
V
OUT
to GND .............................................– 0.3V to 5.5V
V
FB
, SHDN to GND ........................ – 0.3V to (V
IN
+ 0.3V)
I
OUT
(Note 2) ....................................................... 150mA
PACKAGE/ORDER I FOR ATIO
TOP VIEW
C
+
V
IN
C
–
PGND
1
2
3
4
8
7
6
5
V
OUT
FB
SHDN
SGND
ORDER PART
NUMBER
LTC3200EMS8
MS8 PART MARKING
LTNV
V
OUT
1
GND 2
SHDN 3
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 200°C/W
Consult factory for parts specified with wider operating temperature ranges.
The
q
denotes specifications which apply over the full operating
temperature range. Specifications are at T
A
= 25°C, V
IN
= 3.6V, C
FLY
= 1µF, C
IN
= 1µF, C
OUT
= 1µF unless otherwise noted.
SYMBOL
V
IN
V
OUT
I
CC
I
SHDN
V
FB
I
FB
V
R
η
F
OSC
V
IH
V
IL
I
IH
I
IL
t
ON
ELECTRICAL CHARACTERISTICS
PARAMETER
Input Voltage
Output Voltage
Operating Supply Current
Shutdown Current
FB Voltage (LTC3200)
FB Input Current (LTC3200)
Output Ripple (LTC3200-5)
Efficiency (LTC3200-5)
Switching Frequency
SHDN Input Threshold
SHDN Input Threshold
SHDN Input Current
SHDN Input Current
V
OUT
Turn-On Time
Open-Loop Output Resistance
CONDITIONS
q
2.7V
≤
V
IN
≤
4.5V, I
OUT
≤
40mA
3.1V
≤
V
IN
≤
4.5V, I
OUT
≤
100mA
I
OUT
= 0mA, SHDN = V
IN
SHDN = 0V, V
OUT
= 0V
V
FB
= 1.4V
V
IN
= 3V, I
OUT
= 100mA
V
IN
= 3V, I
OUT
= 50mA
SHDN = V
IN
SHDN = 0V
V
IN
= 3V, I
OUT
= 0mA, 10% to 90%
V
IN
= 3V, I
OUT
= 100mA, V
FB
= 0V (Note 4)
R
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.
2
U
U
W
W W
U
W
(Note 1)
V
OUT
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
TOP VIEW
6 C
+
5 V
IN
4 C
–
ORDER PART
NUMBER
LTC3200ES6-5
S6 PART MARKING
LTSH
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 230°C/W
MIN
2.7
4.8
4.8
q
q
q
q
q
q
TYP
5
5
3.5
MAX
4.5
5.2
5.2
8
1
1.319
50
UNITS
V
V
V
mA
µA
V
nA
mV
P-P
%
MHz
V
1.217
–50
1.268
30
80
1
q
q
q
q
2
0.4
1.3
–1
–1
0.8
9.2
1
1
V
µA
µA
ms
Ω
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
OL
≡
(2 V
IN
– V
OUT
)/I
OUT
LTC3200/LTC3200-5
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Supply Voltage
5.15
5.10
OUTPUT VOLTAGE (V)
5.05
5.00
T
A
= – 40°C
4.95
4.90
4.85
4.8
3
0
100
150
50
LOAD CURRENT (mA)
200
3200 G02
C
IN
= C
OUT
= C
FLY
= 1µF
I
OUT
= 20mA
OUTPUT VOLTAGE (V)
T
A
= 85°C
T
A
= 25°C
5.1
SUPPLY CURRENT (mA)
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
Oscillator Frequency vs Supply
Voltage
3.0
2.8
OSCILLATOR FREQUENCY (MHz)
1.1
1.0
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
2.7
3.0
T
A
= – 40°C
T
A
= 25°C
THRESHOLD VOLTAGE (V)
2.6
T
A
= 25°C
0.8
0.7
0.6
0.5
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
4.5
3200 G05
EFFICIENCY (%)
T
A
= 85°C
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
OUTPUT CURRENT (mA)
U W
4.2
3200 F01
(LTC3200-5)
No Load Supply Current vs Supply
Voltage
6
C
IN
= C
OUT
= C
FLY
= 1µF
V
SHDN
= V
IN
T
A
= 25°C
Output Voltage vs Load Current
5.2
C
IN
= C
OUT
= C
FLY
= 1µF
T
A
= 25°C
5
5.0
V
IN
= 2.7V
4.9
V
IN
= 3.2V
V
IN
= 3V
T
A
= 85°C
4
T
A
= – 40°C
4.5
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
4.5
3200 G03
V
SHDN
Threshold Voltage vs
Supply Voltage
100
90
Efficiency vs Load Current
C
IN
= C
OUT
= C
FLY
= 1µF
T
A
= 25°C
V
IN
= 2.7V
V
IN
= 3.2V
V
IN
= 3.7V
V
IN
= 4.5V
50
40
30
0.9
T
A
= – 40°C
80
70
60
T
A
= 85°C
4.2
4.5
3200 G04
1
10
LOAD CURRENT (mA)
100
3200 G06
Short Circuit Current vs Supply
Voltage
250
C
FLY
= 1µF
T
A
= 25°C
V
OUT
= 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
TYPICAL PERFOR A CE CHARACTERISTICS
V
OUT
Soft-Start Ramp
V
SHDN
2V/DIV
V
OUT
(AC
COUPLED)
20mV/DIV
C
OUT
= 1µF
C
OUT
= 3.3µF
V
OUT
1V/DIV
V
IN
= 3V
200µs/DIV
32005 G08
PIN FUNCTIONS
LTC3200/LTC3200-5
C
+
(Pins 1/6):
Flying Capacitor Positive Terminal.
V
IN
(Pins 2/5):
Input Supply Voltage. V
IN
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
U W
(LTC3200-5) T
A
= 25°C
Load Transient Response
I
L
10mA TO
90mA
50mA/DIV
V
OUT
(AC
COUPLED)
50mV/DIV
Output Ripple
C
OUT
= 10µF
V
IN
= 3.3V
I
L
= 100mA
200ns/DIV
32005 G09
V
IN
= 3.3V
C
OUT
= 1µF
10µs/DIV
32005 G10
U
U
U
FB (Pin 7):
(LTC3200 Only) Feedback Input Pin. An output
divider should be connected from V
OUT
to FB to program
the output voltage.
V
OUT
(Pins 8/1):
Regulated Output Voltage. V
OUT
should
be bypassed with a 1µF to 4.7µF low ESR ceramic capaci-
tor as close as possible to the pin for best performance.
LTC3200/LTC3200-5
SI PLIFIED BLOCK DIAGRA S
LTC3200
V
OUT
FB
8
7
2MHz
OSCILLATOR
V
IN
2
C
–
V
OUT
1
2MHz
OSCILLATOR
V
IN
5
C
–
–
+
–
+
W
W
SOFT-START
AND
SWITCH CONTROL
6
SHDN
CHARGE
PUMP
1
C
+
3
5
SGND
4
PGND
3200 BD
LTC3200-5
SOFT-START
AND
SWITCH CONTROL
3
SHDN
CHARGE
PUMP
6
C
+
4
2
GND
3200-5 BD
5
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