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LT1306 Datasheet

  • LT1306

  • Synchronous, Fixed Frequency Step-Up DC/DC Converter

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LT1306
Synchronous, Fixed Frequency
Step-Up DC/DC Converter
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
Output Disconnected from Input During Shutdown
Output Voltage Remains Regulated
When V
IN
> V
OUT
Controlled Input Current During Start-Up
300kHz Current Mode PWM Operation
Can Be Externally Synchronized
Internal 2A Switches
Operates with V
IN
as Low as 1.8V
Automatic Burst Mode Operation at Light Loads
Quiescent Current: 160碌A(chǔ)
Shutdown Current: 9碌A(chǔ) Typ
The LT
廬
1306 is a fully integrated, fixed frequency syn-
chronous boost converter capable of generating 5V at 1A
from a Li-Ion cell. The device contains both the main
power switch and synchronous rectifier on chip and
automatically disconnects the output from the input in
shutdown, eliminating the need for external load discon-
nect circuitry. Additionally, the output remains regulated
when V
IN
exceeds V
OUT
, allowing difficult step-up/step-
down converter functions to be easily realized using a
single inductor.
The internal 300kHz oscillator of the LT1306 can be easily
synchronized to an external clock from 425kHz to 500kHz.
This allows switching harmonics to be tightly controlled
and eliminates any beat frequencies that may result from
a multifrequency system. The LT1306 automatically shifts
into power saving Burst Mode
TM
operation at light loads.
At heavy loads the LT1306 operates in fixed frequency
current mode. No-load quiescent current is 160碌A(chǔ) and
reduces to 9碌A(chǔ) in shutdown mode.
The LT1306 is available in an SO-8 package.
APPLICATIO S
s
s
s
s
Satellite Phones
Portable Instruments
Personal Digital Assistants
Palmtop Computers
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
D1
L1
10碌H
C1
1碌F
90
85
EFFICIENCY (%)
1-CELL
Li-Ion
V
IN
S/S
SW
LT1306
CAP
OUT
R1
768k
FB
GND
R2
249k
5V
1A
+
C
IN1
22碌F
C
IN2
0.1碌F
V
C
R3
118k
C
Z
68nF
+
C
O1
220碌F
C
O2
1碌F
C
IN1
: AVX TAJC226M010
C
O1
: AVX TPSE227M010R0100
C
IN1
, C
O2
: CERAMIC
C1: AVX TAJA105K020
D1: MMBD914LT1
L1: CTX10-2
C
P
68pF
1306 F01
Figure 1. Single Li-Ion Cell to 5V Converter
U
Efficiency
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 2.6V
80
75
70
65
60
1
10
100
LOAD CURRENT (mA)
1000
1306 TA01
U
U
+
V
O
= 5V
L1 = 10碌H
(FIGURE 1)
1

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