LTC1514-3.3 LINER [Linear Technology], LTC1514-3.3 Datasheet - Page 4

• Manufacturer Part Number: LTC1514-3.3
• Description: Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator
• Manufacturer: LINER [Linear Technology]

PIN
LTC1514-3.3/LTC1514-5
BLOCK
SHDN (Pin 1): Shutdown Input. A logic low on the SHDN
pin puts the part into shutdown mode. A logic high
(V
high V
with 3V logic without causing a large rise in V
current. The SHDN pin may not float; connect to V
unused.
4
TYPICAL PERFORMANCE CHARACTERISTICS
SHDN
U
FUNCTIONS
IN
AC COUPLED
100mV/DIV
50mA/DIV
voltages, the SHDN pin may still be controlled
1.6V) enables the charge pump regulator. At
U
V
I
DIAGRAM
OUT
OUT
V
LTC1514-5 Step-Down Mode
Load Transient Response
IN
= 8V, V
U
OUT
SHDN
= 5V, C
LBO
V
IN
W
W
OUT
= 10 F, T
U
A
= 25 C
OSCILLATOR
1514 G10
650kHz
IN
50mA
0mA
quiescent
IN
STEP-UP/STEP-DOWN
if
CHARGE PUMP
C1
–
LBO (Pin 2): Open-Drain, Low-Battery Comparator Out-
put. This pin will pull low whenever the voltage on the LBI
pin is less than the internal reference voltage (1.145V typ).
LBI (Pin 3): Low-Battery Comparator Input. The voltage
on this pin is compared to the internal reference voltage
(1.145V). The LBO output will sink current when the
voltage on the LBI pin is less than 1.145V typ. The low-
–
+
–
+
C1
AC COUPLED
+
100mV/DIV
1.145V
50mA/DIV
V
REF
GND
V
I
OUT
OUT
LTC1514-5 Step-Up Mode
Load Transient Response
V
IN
= 3.3V, V
1514 BD
OUT
= 5V, C
V
LBI
OUT
OUT
= 10 F, T
A
= 25 C
1514 G11