ltc3240-3.3 Linear Technology Corporation, ltc3240-3.3 Datasheet - Page 5

• Manufacturer Part Number: ltc3240-3.3
• Description: 3.3v/2.5v Step-up/ Step-down Charge Pump Dc/dc Converter
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
AC COUPLED
GND (Pin 1): Ground. This pin should be tied to a ground
plane for best performance.
V
with a 1μF or greater, low ESR ceramic capacitor.
V
bypassed with a 4.7μF or greater, low ESR ceramic capaci-
tor as close to the pin as possible for best performance.
C
TYPICAL PERFOR A CE CHARACTERISTICS
unless otherwise noted)
I
IN
OUT
+
LOAD
20mV/DIV
U
(Pin 4): Flying Capacitor Positive Terminal.
(Pin 2): Input Supply Voltage. V
60mA
10mA
V
(Pin 3): Regulated Output Voltage. V
OUT
V
I
Load Transient Response
(LTC3240-3.3)
LOAD
IN
U
= 3.7V
= 10mA TO 60mA
LDO MODE
10µs/DIV
U
W
U
IN
3240 G15
should be bypassed
AC COUPLED
20mV/DIV
OUT
V
OUT
should be
V
I
Output Noise/Ripple
(LTC3240-2.5)
LOAD
IN
= 2.4V
= 100mA
500ns/DIV
C
⎯ S ⎯ H ⎯ D ⎯ N (Pin 6): Active Low Shutdown Input. A low on ⎯ S ⎯ H ⎯ D ⎯ N
disables the LTC3240-3.3/LTC3240-2.5. This pin is a high
impedance CMOS input pin which must be driven with valid
logic levels. This pin must not be allowed to fl oat.
Exposed Pad (Pin 7): Ground. The exposed pad must be
soldered to PCB ground to provide electrical contact and
optimum thermal performance.
–
(Pin 5): Flying Capacitor Negative Terminal.
LTC3240-3.3/LTC3240-2.5
(T
A
3240 G16
= 25°C, C
AC COUPLED
I
LOAD
20mV/DIV
50mA
10mA
V
FLY
OUT
= C
V
I
Load Transient Response
(LTC3240-2.5)
LOAD
IN
OPERATION
IN
Burst Mode
= 2.4V
= 10mA TO 50mA
= 1µF, C
OUT
CONST FREQUENCY
10µs/DIV
= 4.7µF
MODE
3240fb
5
3240 G17