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LT1571EGN-1#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1571 Series
TYPICAL APPLICATION
U
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
Constant-Current/
Constant-Voltage Battery Chargers
with Preset Voltage and Termination Flag
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LT
®
1571 PWM battery charger is a simple, efficient
solution to fast-charge rechargeable batteries including
lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and
nickel-cadmium (NiCd) using constant-current and/or
constant-voltage control. The internal switch is capable
of delivering 1.5A DC current (2A peak current). The
onboard current sense resistor (0.1Ω) allows simple
charge current programming to within 5% accuracy
using a low cost external resistor. The constant-voltage
output can be selected for 4.1V or 4.2V per cell with 0.6%
accuracy.
LT1571 can charge batteries ranging from 1V to 20V. A
saturating switch operating at 200kHz (LT1571-1,
LT1571-2) or 500kHz (LT1571-5) gives high efficiency
and small charger size. A logic output (flag) indicates
Li-Ion near full charge when the charge current drops to
20% of the programmed value. The LT1571-1 and
LT1571-2 are in a 28-pin fused lead narrow SSOP power
package. The LT1571-5 is in a 16-pin fused lead narrow
SSOP power package.
■
Fast Charging of Li-Ion, NiMH and NiCd Batteries
■
Simple Charge Current Programming Requires
Only One Low Cost, 1/32W Resistor
■
High Efficiency Charger with Up to
1.5A Charge Current
■
Precision 0.6% Internal Voltage Reference
■
Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V
■
500kHz or 200kHz Switching Frequency
Minimizes Charger Size
■
Low Reverse Battery Drain Current: 5µA
■
Flag Indicates Li-Ion Charge Completion
■
5% Typical Charge Current Accuracy
■
Low Shutdown Current
■
LT1571-1: 200kHz, Adjustable Voltage
LT1571-2: 200kHz, Fixed 8.2V or 8.4V
LT1571-5: 500kHz, Fixed 4.1V or 4.2V
■
Cellular Phones, PDAs, Notebook Computers,
Portable Instruments
■
Cradle Chargers for Li-Ion, NiCd, NiMH and
Lead-Acid Rechargeable Batteries
Figure 1. Compact Li-Ion Cellular Phone Charger (0.8A)
SW
V
CC
PROG
6.19k
100k
V
IN
8.2V TO 20V
(ADAPTER
OUTPUT)
CHARGE
COMPLETE
+
1571 F01
C1
0.22µF
C
IN
*
10µF
L1**
10µH
LT1571-5
D1
MBRM120T3
D3
MBRM120T3
D2
MMBD914L
SELECT
SENSE
GND
CAP
4.2V
Li-Ion
BATTERY
0.33µF
0.1µF
1k
1µF
TOKIN OR MARCON CERAMIC SURFACE MOUNT
COILTRONICS TP3-100, 10µH, 2.2mm HEIGHT (0.8A CHARGING CURRENT)
COILTRONICS TP1 SERIES, 10µH, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)
PANASONIC EEFCD1B220
*
**
***
BOOST
C
OUT
***
22µF
+
V
C
BAT
BAT2
FLAG
300Ω
2
LT1571 Series
Supply Voltage (V
CC
) .............................................. 28V
BOOST Pin Voltage with Respect to V
CC
................. 20V
FLAG Pin Voltage ..................................................... V
CC
I
BAT
(Average)........................................................ 1.5A
Switch Current (Peak) .............................................. 2A
Storage Temperature Range ................. –65°C to 150°C
Operating Ambient
Temperature Range (Note 2) .................. –40°C to 85°C
Operating Junction
Temperature Range .............................. –40°C to 125°C
Lead Temperature (Soldering, 10 sec)..................300°C
Consult factory for Industrial and Military grade parts.
* V
CC1
AND V
CC2
SHOULD BE CONNECTED
TOGETHER CLOSE TO THE PINS
** FOUR CORNER PINS ARE FUSED TO
INTERNAL DIE ATTACH PADDLE FOR
HEAT SINKING. CONNECT THESE FOUR
PINS TO EXPANDED PC LANDS FOR
PROPER HEAT SINKING
LT1571EGN-1
ORDER PART NUMBER
T
JMAX
= 125°C, θ
JA
= 40°C/W
TOP VIEW
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
**GND
SW
BOOST
BAT2
FLAG
SELECT
SENSE
**GND
GND**
V
CC1
*
V
CC2
*
CAP
PROG
V
C
BAT
GND**
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD NARROW PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
**GND
**GND
**GND
SW
BOOST
BAT2
FLAG
NC
SELECT
SENSE
**GND
**GND
**GND
**GND
GND**
GND**
GND**
GND**
V
CC1
*
V
CC2
*
CAP
PROG
V
C
BAT
GND**
GND**
GND**
GND**
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD NARROW PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
**GND
**GND
**GND
SW
BOOST
NC
FLAG
NC
V
FB
SENSE
**GND
**GND
**GND
**GND
GND**
GND**
GND**
GND**
V
CC1
*
V
CC2
*
CAP
PROG
V
C
BAT
GND**
GND**
GND**
GND**
* V
CC1
AND V
CC2
SHOULD BE CONNECTED TOGETHER
CLOSE TO THE PINS
** ALL GND PINS ARE FUSED TO INTERNAL DIE ATTACH
PADDLE FOR HEAT SINKING. CONNECT THESE PINS TO
EXPANDED PC LANDS FOR PROPER HEAT SINKING
40°C/W THERMAL RESISTANCE ASSUMES AN INTERNAL
GROUND PLANE DOUBLING AS A HEAT SPREADER
T
JMAX
= 125°C, θ
JA
= 40°C/W
* V
CC1
AND V
CC2
SHOULD BE CONNECTED TOGETHER
CLOSE TO THE PINS
** ALL GND PINS ARE FUSED TO INTERNAL DIE ATTACH
PADDLE FOR HEAT SINKING. CONNECT THESE PINS TO
EXPANDED PC LANDS FOR PROPER HEAT SINKING
40°C/W THERMAL RESISTANCE ASSUMES AN INTERNAL
GROUND PLANE DOUBLING AS A HEAT SPREADER
ORDER PART NUMBER
ORDER PART NUMBER
T
JMAX
= 125°C, θ
JA
= 75°C/W
LT1571EGN-2LT1571EGN-5
(Note 1)
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
3
LT1571 Series
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
CC
= 16V (LT1571-1, LT1571-2), V
CC
= 10V (LT1571-5), V
BAT
= 8V (LT1571-1,LT1571-2), V
BAT
= 4V (LT1571-5), no load on any
outputs unless otherwise noted. (Note 6)
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Overall
Supply Current V
PROG
= 2.7V ● 5.2 7 mA
DC Battery Charging Current, I
BAT
8V ≤ V
CC
≤ 26V, 0V ≤ V
BAT
≤ 20V (LT1571-1)
R
PROG
= 4.93k ● 0.93 1.0 1.07 A
R
PROG
= 4.93k, T
J
< 0°C 0.91 1.09 A
R
PROG
= 3.28k ● 1.35 1.5 1.65 A
R
PROG
= 49.3k 75 100 125 mA
R
PROG
= 49.3k, T
J
< 0°C 70 130 mA
Shutdown
Auto Shutdown, Reverse Current from Battery V
BAT
≤ 20V, 0°C ≤ T
J
≤ 70°C (LT1571-1) 5 15 µA
(When Adapter in Figure 1 Circuit is Removed)
Shutdown Threshold at V
C
Pin 40 80 mV
When V
CC
is Connected
Shutdown Supply Current V
C
≤ 40mV 0.15 0.3 mA
Reference
Reference Voltage (LT1571-1) R
PROG
= 4.93k. Measured at V
FB
, with VA
Supplying I
PROG
and Switch Off
8V ≤ V
CC
≤ 26V, 0°C ≤ T
J
≤ 70°C 2.446 2.465 2.480 V
8V ≤ V
CC
≤ 26V, 0°C ≤ T
J
≤ 125°C 2.441 2.465 2.489 V
8V ≤ V
CC
≤ 26V, T
J
< 0°C (Note 5) 2.430 2.465 2.480 V
Preset Battery Voltage
LT1571-2: 8.2V/8.4V R
PROG
= 4.93k. Measured at BAT2 Pin
LT1571-5: 4.1V/4.2V T
J
= 25°C 0.5 %
8V ≤ V
CC
≤ 26V, 0°C ≤ T
J
≤ 125°C–11%
Voltage Setting Resistors Tolerance (R4, R5) Absolute Value, Not Matching –40 40 %
BAT2 Pin Input Current (LT1571-2, LT1571-5) V
BAT2
= V
PRESET
– 1V ● 6 µA
Charge Completion Flag (Comparator E6)
Charge Completion Threshold (Note 8) R
PROG
= 4.93k 0.14 0.20 0.28 A
R
PROG
= 4.93k, R
CAP
= 65.6k 0.05 0.085 0.13 A
Threshold on CAP Pin Low-to-High Threshold 4 4.5 V
High-to-Low Threshold 0.6 V
FLAG (Open Collector) Output Low V
CAP
= 4.5V, I
FLAG
≤ 1mA ● 0.3 V
FLAG Pin Leakage Current V
CAP
= 0.6V, V
CC
= 26V ● 3 µA
Voltage Amplifier VA
Transconductance Output Current from 100µA to 500µA 0.3 0.6 2.5 mho
Output Source Current V
PROG
= V
REF
, V
FB
= V
REF
+ 10mV 1.3 mA
V
FB
Input Bias Current (LT1571-1) At 0.75mA Output Current ● ±3 ±15 nA
Overall
Minimum Input Operating Voltage Undervoltage Lockout ● 6.2 7 7.8 V
Boost Pin Current V
CC
– V
BOOST
≤ 20V ● 0.10 20 µA
20V < V
CC
– V
BOOST
≤ 26V ● 0.25 30 µA
2V ≤ V
BOOST
– V
CC
≤ 8V (Switch ON) ● 611 mA
8V < V
BOOST
– V
CC
≤ 20V (Switch ON) (LT1571-1) ● 814 mA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1571EGN-1#TRPBF

Mfr. #:
Buy LT1571EGN-1#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Adj Output CC/CV Batt Charger
Lifecycle:
New from this manufacturer.
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