LT1505CG#TR Linear Technology, LT1505CG#TR Datasheet

IC CHARGER BATT CONST V/I 28SSOP

LT1505CG#TR

Manufacturer Part Number
LT1505CG#TR
Description
IC CHARGER BATT CONST V/I 28SSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LT1505CG#TR

Function
Charge Management
Battery Type
Li-Ion, NiCd, NiMH
Voltage - Supply
11 V ~ 24 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
28-SSOP (0.200", 5.30mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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FEATURES
TYPICAL
APPLICATIO S
Simple Charging of Li-Ion, NiMH and NiCd Batteries
Very High Efficiency: Up to 97%
Precision 0.5% Charging Voltage Accuracy
Preset Battery Voltages: 12.3V, 12.6V,
16.4V and 16.8V
5% Charging Current Accuracy
Charging Current Programmed by Resistor or DAC
0.5V Dropout Voltage, Duty Cycle > 99.5%
AC Adapter Current Limit* Maximizes Charging Rate
Flag Indicates Li-Ion Charge Completion
Auto Shutdown with Adapter Removal
Only 10 A Battery Drain When Idle
Synchronizable Up to 280kHz
Notebook Computers
Portable Instruments
Chargers for Li-Ion, NiMH, NiCd and Lead Acid
Rechargeable Batteries
ADAPTER)
(FROM
V
IN
*BODY DIODE
R5
R6
POLARITY MUST
BE AS SHOWN
4k
4k
APPLICATION
100k
DBODY*
Si4435
M3
500
U
R7
C6
0.1 F
SYSTEM POWER
0.025
R
1 F
C1
S4
TO
R1
1k
C7
0.68 F
C
47 F
35V
IN
U
Figure 1. Low Dropout 4A Lithium-Ion Battery Charger
INFET
UV
SYNC
SHDN
FLAG
CAP
COMP1
CLN
CLP
BAT2 BAT
V
CC
BOOST
LT1505
SENSE
BOOSTC
3 CELL
TGATE
BGATE
GBIAS
PROG
AGND
PGND
SPIN
4.2V
4.1V
SW
V
V
High Efficiency Battery Charger
FB
C
R
4.93k
1%
C
PROG
PROG
1 F
C3
2.2 F
300
5
DESCRIPTIO
The LT
multiple battery chemistries including lithium-ion (Li-Ion),
nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd)
using constant-current or constant-voltage control. Maxi-
mum current can be easily programmed by resistors or a
DAC. The constant-voltage output can be selected for 3 or 4
series Li-Ion cells with 0.5% accuracy.
A third control loop limits the current drawn from the AC
adapter during charging*. This allows simultaneous opera-
tion of the equipment and fast battery charging without over-
loading the AC adapter.
The LT1505 can charge batteries ranging from 2.5V to 20V
with dropout voltage as low as 0.5V. Synchronous
N-channel FETs switching at 200kHz give high efficiency
and allow small inductor size. A diode is not required in
series with the battery because the charger automatically
enters a 10 A sleep mode when the wall adapter is un-
plugged. A logic output indicates Li-Ion full charge when
current drops to 20% of the programmed value.
The LT1505 is available in a 28-pin SSOP package.
*US Patent No. 5,723,970
Constant-Current/Voltage
MMSD4148T1
, LTC and LT are registered trademarks of Linear Technology Corporation.
D2
R
3k
®
X4
* DBODY IS THE BODY DIODE OF M3
0.33 F
1505 PWM battery charger controller fast charges
C
L1: SUMIDA CDRH127-150
IN
(CAN BE FROM 10 H TO 30 H)
: SANYO OS-CON
M1
Si4412
M2
Si4412
C4
0.1 F
MMSD4148T1
D4
MBRS140
U
D3
C2
0.68 F
15 H
L1
0.025
R
200
1%
R
S2
S1
R
200
1%
S3
C
22 F
25V
OUT
1505 F01
2
LT1505
12.6V
BATTERY
V
BAT
1505fc
1

Related parts for LT1505CG#TR

LT1505CG#TR Summary of contents

Page 1

... A sleep mode when the wall adapter is un- plugged. A logic output indicates Li-Ion full charge when current drops to 20% of the programmed value. The LT1505 is available in a 28-pin SSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. *US Patent No. 5,723,970 V BOOST BOOSTC ...

Page 2

LT1505 ABSOLUTE MAXIMUM V , CLP, CLN, INFET, UV, 3CELL, FLAG................ 27V CC SW Voltage with Respect to GND ........................... – 2V BOOST, BOOSTC Voltage with Respect to V GBIAS ..................................................................... 10V SYNC, BAT2, BAT, SENSE, SPIN ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T outputs unless otherwise noted. PARAMETER Preset Battery Voltage (12.3V, 16.4V, 12.6V, 16.8V) All Preset Battery Voltages Preset Battery Voltage Tolerance BAT2 Pin Input Current Voltage Setting Resistors Tolerance (R4, R5, R6, ...

Page 4

LT1505 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T outputs unless otherwise noted. PARAMETER Voltage Amplifier VA Transconductance (Note 3) Output Source Current V Input Bias Current FB Current Limit Amplifier CL1 Turn-On Threshold Transconductance CLP Input Current CLN ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS Efficiency of Figure 1 Circuit 105 V = 19V 12.6V BAT 100 (A) BAT 1505 G01 (Voltage Amplifier) FB ...

Page 6

LT1505 PIN FUNCTIONS BOOST (Pin 1): This pin is used to bootstrap and supply power for the topside power switch gate drive and control circuity. In normal operation, V BOOST internally generated 8.6V regulator V + 9.1V ...

Page 7

PIN FUNCTIONS the noninverting input to the amplifier the Block Diagram, that controls the charging current when the device operates in constant voltage mode. The amplifier VA controls the charging current to maintain the voltage ...

Page 8

LT1505 W BLOCK DIAGRAM (LT1505 – 6. 6. BAT 0.2V E1 – SHUTDOWN – GBIAS SHDN – ...

Page 9

TEST CIRCUITS V C 75k 0.047 0.65V CAP 0.047 F + FLAG 2V 1k – + 0.033 F LT1013 20k Test Circuit 1 LT1505 – CA1 CA2 REF PROG 300 PROG ...

Page 10

LT1505 U OPERATION The LT1505 is a synchronous current mode PWM step- down (buck) switcher. The battery DC charge current is pro- grammed by a resistor R (or a DAC output current) at PROG the PROG pin and the ratio ...

Page 11

U U APPLICATIONS INFORMATION EMI considerations usually make it desirable to minimize ripple current in the battery leads. Beads or inductors may be added to increase battery impedance at the 200kHz switching frequency. Switching ripple current splits be- tween the ...

Page 12

LT1505 U U APPLICATIONS INFORMATION This is accomplished by sensing total adapter output current and adjusting charge current downward if a preset adapter current limit is exceeded. True analog control is used, with closed loop feedback ensuring that adapter load ...

Page 13

U U APPLICATIONS INFORMATION Preset Battery Voltage Settings The LT1505 provides four preset battery voltages: 12.3V, 12.6V, 16.4V and 16.8V. See the Pin Functions section for pin setting voltage selection. An internal switch connects the resistor dividers to the battery ...

Page 14

LT1505 U U APPLICATIONS INFORMATION amplifier CA1. They are not needed if V higher than V . The PFET M3 is optional and can be BAT replaced with a diode least 3V higher than V IN ...

Page 15

... Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... Fast Charge, Longer Battery Life, Crisis Management CHARGE www.linear.com 7.65 – 7.90 (.301 – .311 1.73 – 1.99 (.068 – .078) .05 – .21 (.002 – .008) G28 SSOP 0501 1505fc LT/TP 1101 1.5K REV C • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1999 ...

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