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

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LTC1514-3.3

Manufacturer Part Number
LTC1514-3.3
Description
Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator
Manufacturer
LINER [Linear Technology]
Datasheet
APPLICATIONS
FEATURES
TYPICAL
LOW BAT
ON OFF
3.3V or 5V Output Voltages
2V to 10V Input Voltage Range
Up to 50mA Output Current
Only Three External Capacitors Required
Soft Start Limits Inrush Current at Turn-On
Low Operating Current: 60 A
Low Shutdown Current: 10 A
Shutdown Disconnects Load from V
Short-Circuit and Overtemperature Protected
650kHz Switching Frequency
Low-Battery Comparator Active in Shutdown
Available in SO-8 Package
Battery-Operated Equipment
Smart Card Readers
Local Power Supplies
Handheld Instruments
Battery Backup Supplies
5V Step-Up/Step-Down Power Supply with Low-Battery Detect
1.33M
1%
499k
1%
APPLICATION
U
1
2
3
4
SHDN
LBO
LBI
GND
LTC1514-5
100k
V
OUT
C1
C1
V
IN
+
8
7
6
5
U
0.22 F
IN
+
10 F
+
V
I
OUT
OUT
10 F
1514 TA01
= 50mA
= 5V
Capacitor DC/DC Converters
Step-Up/Step-Down Switched
with Low-Battery Comparator
DESCRIPTION
The LTC
capacitor DC/DC converters that produce a regulated
output voltage by either stepping up or stepping down
the input voltage. Output voltage is fixed at either 3.3V
(LTC1514-3.3) or 5V (LTC1514-5) by an internal resistor
divider.
A unique architecture allows the parts to accommodate
a wide input voltage range (2V to 10V) while maintaining
inrush current and output voltage ripple when large V
to V
An internal uncommitted comparator is kept active in
shutdown. The comparator has an open-drain output for
flexible interfacing.
The parts are short-circuit and overtemperature pro-
tected. Battery life is maximized by very low operating
currents (I
are available in an SO-8 package.
V
4-CELL
NiCd
4% regulation. Additional circuitry prevents excessive
IN
, LTC and LT are registered trademarks of Linear Technology Corporation.
OUT
®
differentials are present.
1514-3.3/LTC1514-5 are micropower switched
CC
LTC1514-3.3/LTC1514-5
= 60 A typ, 10 A in shutdown). Both parts
5.2
5.1
5.0
4.9
4.8
U
2
I
OUT
3
LTC1514-5 Output Voltage
= 10mA
4
vs Input Voltage
INPUT VOLTAGE (V)
5
6
7
8
LT1514 • TA02
9
10
1
IN

Related parts for LTC1514-3.3

LTC1514-3.3 Summary of contents

Page 1

... DC/DC converters that produce a regulated output voltage by either stepping up or stepping down the input voltage. Output voltage is fixed at either 3.3V (LTC1514-3. (LTC1514- internal resistor divider. A unique architecture allows the parts to accommodate a wide input voltage range (2V to 10V) while maintaining IN 4% regulation ...

Page 2

... U RATINGS PACKAGE/ORDER SHDN 1 LBO 2 LBI 3 GND 4 8-LEAD PLASTIC SO T JMAX Consult factory for Military grade parts unless otherwise noted (Note 2). IN OUT CONDITIONS LTC1514-3.3 LTC1514 8V, I 15mA IN OUT 3V V 8V, I 50mA IN OUT 2.7V V 10V, I 15mA IN OUT 3.3V V 10V, I 50mA IN OUT ...

Page 3

... LTC1514-5 Efficiency vs Input Voltage 100 OUT I = 10mA OUT INPUT VOLTAGE (V) 1514 G08 LTC1514-3.3 Output Voltage Ripple vs Input Voltage 250 V = 3.3V OUT I = 10mA OUT 200 A 150 OUT OUT 100 OUT ...

Page 4

... LTC1514-3.3/LTC1514 TYPICAL PERFORMANCE CHARACTERISTICS LTC1514-5 Step-Down Mode Load Transient Response V OUT AC COUPLED 100mV/DIV I OUT 50mA/DIV OUT OUT W BLOCK DIAGRAM V IN SHDN LBO PIN FUNCTIONS SHDN (Pin 1): Shutdown Input. A logic low on the SHDN pin puts the part into shutdown mode. A logic high (V 1 ...

Page 5

... ESR capacitor as close as possible to the pin for best performance. V (Pin 8): Regulated Output Voltage. The output volt- OUT age is internally set to either 3.3V (LTC1514-3. (LTC1514-5) using an internal resistor divider bypassed with low ESR capacitor as close as possible to the pin for best performance tantalum and should greater ...

Page 6

... Only the effective charge pump output impedance limits the current while the charge pump is enabled. This may disrupt input supply regulation, espe- cially if the input supply is a low power DC/DC converter or linear regulator. The LTC1514-3.3/LTC1514-5 mini- mize inrush currents both at start-up and under normal high operation ...

Page 7

... LTC1514 SHDN V OUT 2 7 LBO LBI C1 0.22 F CHARGE PATH 4 5 – + GND LTC1514-3.3/LTC1514 3.3V 4% OUT I = 15mA, V > 2V OUT 50mA, V > OUT 1514 TA05 BACKED-UP CIRCUITRY BAT54 TRICKLE CHARGE AND LTC1514 I DD ...

Page 8

... LTC1514-3.3/LTC1514-5 U TYPICAL APPLICATIONS Low Power Dual Output Supply (Maximum Combined I ON OFF OUT 3.3V 4% 750k 2.2nF + 402k 1% Q1: TP0610T Q2: MMBT3906LT1 Step-Up/Step-Down Power Supply with Input Autoswitching +6VDC WALL ADAPTER MMBD 914LT1 100k ON OFF PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – ...

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