LTC3200-5_15 Datasheet, PDF (1/12 Pages) Linear Technology – Low Noise, Regulated Charge Pump DC/DC Converters

LTC3200/LTC3200-5
Low Noise, Regulated
Charge Pump DC/DC Converters
FEATURES
s _{Low Noise Constant Frequency Operation}
s _{Output Current: 100mA}
s _{Available in 8-Pin MSOP (LTC3200) and Low}
Profile (1mm) 6-Pin ThinSOT^TM (LTC3200-5)
Packages
s _{2MHz Switching Frequency}
s _{Fixed 5V ± 4% Output (LTC3200-5) or ADJ}
s _{VIN Range: 2.7V to 4.5V}
s _{Automatic Soft-Start Reduces Inrush Current}
s _{No Inductors}
U ^{s ICC <1µA in Shutdown}
APPLICATIO S
s _{White LED Backlighting}
s _{Li-Ion Battery Backup Supplies}
s _{Local 3V to 5V Conversion}
s _{Smart Card Readers}
s _{PCMCIA Local 5V Supplies}
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 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.
TYPICAL APPLICATIO
Regulated 5V Output from a 2.7V to 4.5V Input
1µF
V_IN
2.7V TO 4.5V
1µF
OFF ON
4
6
C^– C⁺
LTC3200-5
5
1
V_IN V_OUT
2
1µF
GND
3
SHDN
V_OUT = 5V ±4%
I_OUT UP TO 40mA, V_IN ≥ 2.7V
I_OUT UP TO 100mA, V_IN ≥ 3.1V
ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ
OR TAIYO YUDEN JMK107BJ105MA
3200-5 TA01
Output Ripple Voltage vs Load Current
40
V_IN = 3V
C_FLY = 1µF
T_A = 25°C
30
C_OUT = 1µF
20
C_OUT = 2.2µF
10
0
0
25
50
75
100
OUTPUT CURRENT (mA)
3200 TA02
1