IC BATT CHARGER CONST V/I 8SOIC

LT1510CS8

Manufacturer Part NumberLT1510CS8
DescriptionIC BATT CHARGER CONST V/I 8SOIC
ManufacturerLinear Technology
LT1510CS8 datasheet
 

Specifications of LT1510CS8

FunctionCharge ManagementBattery TypeLi-Ion, NiCd, NiMH
Voltage - Supply6.2 V ~ 28 VOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS StatusContains lead / RoHS non-compliant  
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FEATURES
Charges NiCd, NiMH and Lithium-Ion Batteries ––
1
Only One
/
W Resistor Is Needed to Program
10
Charging Current
High Efficiency Current Mode PWM with 1.5A
Internal Switch and Sense Resistor
3% Typical Charging Current Accuracy
Precision 0.5% Voltage Reference for Voltage
Mode Charging or Overvoltage Protection
Current Sensing Can Be at Either Terminal of
the Battery
Low Reverse Battery Drain Current: 3 A
Charging Current Soft Start
Shutdown Control
500kHz Version Uses Small Inductor
U
APPLICATIONS
Chargers for NiCd, NiMH and Lithium Batteries
Step-Down Switching Regulator with Precision
Adjustable Current Limit
U
DESCRIPTION
With switching frequency as high as 500kHz, The LT
current mode PWM battery charger is the smallest, sim-
U
TYPICAL APPLICATIONS
C1
D1
0.22 F
MBRM120T3
SW
V
CC
+
C
*
IN
10 F
BOOST
PROG
1 F
L1**
10 H
LT1510-5
D2
MMBD914L
GND
V
0.1 F
C
OVP
SENSE
BAT
+
C
OUT ***
22 F
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED
*
TOKIN OR MARCON CERAMIC SURFACE MOUNT
**
COILTRONICS TP3-100, 10 H, 2.2mm HEIGHT (0.8A CHARGING CURRENT)
COILTRONICS TP1 SERIES, 10 H, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)
***
PANASONIC EEFCD1B220
OPTIONAL, SEE APPLICATIONS INFORMATION
Figure 1. 500kHz Smallest Li-Ion Cell Phone Charger (0.8A)
Constant-Current Battery Charger
plest, most efficient solution to fast-charge modern re-
chargeable batteries including lithium-ion (Li-Ion), nickel-
metal-hydride (NiMH)* and nickel-cadmium (NiCd)* that
require constant-current and/or constant-voltage charg-
ing. The internal switch is capable of delivering 1.5A DC
current (2A peak current). The 0.1
sense resistor makes the charging current programming
very simple. One resistor (or a programming current from
a DAC) is required to set the full charging current (1.5A) to
within 5% accuracy. The LT1510 with 0.5% reference
voltage accuracy meets the critical constant-voltage charg-
ing requirement for lithium cells.
The LT1510 can charge batteries ranging from 2V to 20V.
Ground sensing of current is not required and the battery’s
negative terminal can be tied directly to ground. A saturat-
ing switch running at 200kHz (500kHz for LT1510-5) gives
high charging efficiency and small inductor size. A block-
ing diode is not required between the chip and the battery
because the chip goes into sleep mode and drains only 3 A
when the wall adaptor is unplugged. Soft start and shutdown
features are also provided. The LT1510 is available in a 16-pin
fused lead power SO package with a thermal resistance of
50 C/W, an 8-pin SO and a 16-pin PDIP.
®
1510
, LTC and LT are registered trademarks of Linear Technology Corporation.
* NiCd and NiMH batteries require charge termination circuitry (not shown in Figure 1).
C1
D3
0.22 F
MBRM120T3
8.2V TO 20V
+ –
L1**
33 H
300
6.19k
1k
+
4.2V
Q3
2N7002
R3
70.6k
0.25%
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED
R4
* TOKIN OR MARCON CERAMIC SURFACE MOUNT
100k
** COILTRONICS CTX33-2
0.25%
OPTIONAL, SEE APPLICATIONS INFORMATION
1510 F01
Figure 2. Charging Lithium Batteries (Efficiency at 1.3A > 87%)
LT1510/LT1510-5
Constant-Voltage/
onboard current
D3
D1
1N5819
1N5819
SW
V
CC
+
C
*
IN
10 F
BOOST
PROG
1 F
300
3.83k
LT1510
D2
1N914
GND
V
0.1 F
C
1k
OVP
SENSE
BAT
+
+
C
4.2V
OUT
22 F
+
TANT
4.2V
11V TO 28V
+ –
Q3
VN2222
R3
240k
0.25%
R4
100k
0.25%
1510 F02
1

LT1510CS8 Summary of contents

  • Page 1

    ... The LT1510 is available in a 16-pin fused lead power SO package with a thermal resistance of 50 C/W, an 8-pin SO and a 16-pin PDIP. ® 1510 , LTC and LT are registered trademarks of Linear Technology Corporation. * NiCd and NiMH batteries require charge termination circuitry (not shown in Figure 1 0.22 F MBRM120T3 8 ...

  • Page 2

    ... JMAX JA 8 **GND ORDER PART GN PACKAGE (0.015 IN) NUMBER 16-LEAD PLASTIC SSOP T JMAX LT1510CS8 ** FOUR CORNER PINS ARE FUSED TO LT1510IS8 INTERNAL DIE ATTACH PADDLE FOR HEAT SINKING. CONNECT THESE FOUR PINS TO EXPANDED PC LANDS FOR S8 PART MARKING PROPER HEAT SINKING. 1510 1510I Consult factory for Military grade parts. ...

  • Page 3

    ELECTRICAL CHARACTERISTICS V = 16V 8V, V (maximum operating V CC BAT MAX PARAMETER Overall Minimum Input Operating Voltage Reverse Current from Battery (When V Is Not CC Connected Floating) SW Boost Pin Current Switch Switch ...

  • Page 4

    LT1510/LT1510-5 ELECTRICAL CHARACTERISTICS V = 16V 8V, V (maximum operating V CC BAT MAX PARAMETER Current Amplifier (CA2) Transconductance Maximum V for Switch OFF C I Current (Out of Pin) VC Voltage Amplifier (VA), 16-Pin Only Transconductance (Note ...

  • Page 5

    W U TYPICAL PERFORMANCE CHARACTERISTICS Efficiency of Figure 2 Circuit 100 V = 15V (EXCLUDING DISSIPATION INPUT DIODE D3 8.4V BAT 0.1 0.3 0.5 0.7 0.9 ...

  • Page 6

    LT1510/LT1510 TYPICAL PERFORMANCE CHARACTERISTICS Switch Current vs Boost Current vs Boost Voltage 16V 38V 40 BOOST 28V 35 18V 0.2 0.4 0.6 0.8 ...

  • Page 7

    W BLOCK DIAGRAM 0. – 1.5V GND PWM V BAT – 60k TEST CIRCUITS V C 0.047 0.65V 200kHz + OSCILLATOR SHUTDOWN – – SLOPE ...

  • Page 8

    LT1510/LT1510-5 TEST CIRCUITS U OPERATIO The LT1510 is a current mode PWM step-down (buck) switcher. The battery DC charging current is programmed by a resistor R (or a DAC output current) at the PROG PROG pin (see Block Diagram). Amplifier ...

  • Page 9

    U U APPLICATIONS INFORMATION capacity ceramic capacitor ( from Tokin or United Chemi-Con/MARCON, et al., and the old standby, aluminum electrolytic, which will require more microfarads to achieve adequate ripple rating. OS-CON can also be used. ...

  • Page 10

    LT1510/LT1510 APPLICATIONS INFORMATION where R is the total resistance from PROG pin to PROG ground. For example, 1A charging current is needed. 2 465 V 2000 PROG 1 A Charging current can also be programmed ...

  • Page 11

    U U APPLICATIONS INFORMATION of the battery, canceling part or all of the 200 A. Note that if net current is into the battery and the battery is removed, the charger output voltage will float high, to near input voltage. ...

  • Page 12

    LT1510/LT1510 APPLICATIONS INFORMATION 0.18 INTERNAL SENSE RESISTOR LT1510 GND Figure 7. Current Comparator for Initiating Float Time-Out voltage decrease is detected as an indication of near full charge. The charging current is then reduced to a much ...

  • Page 13

    U U APPLICATIONS INFORMATION Example 15V 8.4V BAT BIAS 012 ...

  • Page 14

    LT1510/LT1510 APPLICATIONS INFORMATION 90 NOTE: PEAK DIE TEMPERATURE WILL BE ABOUT 10 C HIGHER THAN LEAD TEMPER- 80 ATURE AT 1.3A CHARGING CURRENT 70 2-LAYER BOARD 60 50 4-LAYER BOARD I = 1.3A 40 CHRG V = 16V ...

  • Page 15

    ... DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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

    ... F POT 1 F 100k V OUT 2.5V TO 15V CURRENT LIMIT LEVEL 50mA TO 1A 1510 TA01 0.386 – 0.394* (9.804 – 10.008 0.150 – 0.157** (3.810 – 3.988 1510fc LT/GP 1197 REV C 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 S16 0695 ...