Charges NiCd, NiMH and Lithium-Ion Batteries 鈥撯€?/div>
Only One
1
/
10
W Resistor Is Needed to Program
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碌A(chǔ)
Charging Current Soft Start
Shutdown Control
500kHz Version Uses Small Inductor
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鈩?onboard current
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鈥檚
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碌A(chǔ)
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擄C/W, an 8-pin SO and a 16-pin PDIP.
, LTC and LT are registered trademarks of Linear Technology Corporation.
* NiCd and NiMH batteries require charge termination circuitry (not shown in Figure 1).
APPLICATIONS
s
s
Chargers for NiCd, NiMH and Lithium Batteries
Step-Down Switching Regulator with Precision
Adjustable Current Limit
DESCRIPTION
With switching frequency as high as 500kHz, The LT
廬
1510
current mode PWM battery charger is the smallest, sim-
TYPICAL APPLICATIONS
C1
0.22碌F
D1
MBRM120T3
SW
V
CC
D3
MBRM120T3
C1
D1
0.22碌F 1N5819
D3
1N5819
SW
V
CC
11V TO 28V
+
C
IN
*
10碌F
1碌F
BOOST
L1**
10碌H
D2
MMBD914L
PROG
LT1510-5
GND
OVP
V
C
0.1碌F
SENSE
BAT
+
C
OUT***
22碌F
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED
* TOKIN OR MARCON CERAMIC SURFACE MOUNT
** COILTRONICS TP3-100, 10碌H, 2.2mm HEIGHT (0.8A CHARGING CURRENT)
COILTRONICS TP1 SERIES, 10碌H, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)
*** PANASONIC EEFCD1B220
鈥?OPTIONAL, SEE APPLICATIONS INFORMATION
Figure 1. 500kHz Smallest Li-Ion Cell Phone Charger (0.8A)
U
U
U
8.2V TO 20V
+
+
鈥?/div>
BOOST
PROG
C
IN
*
10碌F
1碌F
+
鈥?/div>
3.83k
300鈩?/div>
6.19k
L1**
33碌H
D2
1N914
LT1510
GND
OVP
SENSE
BAT
V
C
0.1碌F
300鈩?/div>
1k
1k
+
4.2V
Q3
鈥?/div>
2N7002
R3
70.6k
0.25%
R4
100k
0.25%
1510 F01
+
C
OUT
22碌F
TANT
+
4.2V
+
4.2V
Q3
鈥?/div>
VN2222
R3
240k
0.25%
R4
100k
0.25%
1510 F02
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED
* TOKIN OR MARCON CERAMIC SURFACE MOUNT
** COILTRONICS CTX33-2
鈥?/div>
OPTIONAL, SEE APPLICATIONS INFORMATION
Figure 2. Charging Lithium Batteries (Efficiency at 1.3A > 87%)
1
LT1510I相關(guān)型號PDF文件下載
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