LTC4001 Datasheet, PDF (2/20 Pages) Linear Technology – 2A Synchronous Buck Li-Ion Charger

LTC4001
ABSOLUTE AXI U RATI GS
(Note 1)
PV_IN, V_INSENSE
t < 1ms, DC < 1% .................................... –0.3V to 7V
Steady State ............................................ –0.3V to 6V
SW, SENSE, BAT, BATSENS, SS, FAULT, CHRG, EN,
NTC, PROG, IDET, TIMER Voltage .............. – 0.3V to 6V
Operating Temperature Range (Note 3) .. – 40°C to 85°C
Operating Junction Temperature
(Note 5) ............................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
16 15 14 13
BAT 1
12 PROG
SENSE 2
11 NTC
17
PGND 3
10 FAULT
GNDSENS 4
9 V_INSENSE
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 37°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER UF PART MARKING
LTC4001EUF
4001
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T_A = 25°C.
V_IN = 5V, V_EN = 0V, R_PROG = 549Ω, R_IDET = 549Ω, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
V_IN
Supply Voltage
I_IN
(Note 2)
PV_IN Connected to V_INSENSE, PROG and IDET
Pins Open, Charger On
4
5.5
2
V_FLOAT V_BAT Regulated Float Voltage
Shutdown, EN = V_IN
Measured from BATSENS to GNDSENS
50
● 4.158 4.2 4.242
4.179 4.2 4.221
I_BAT
I_TRIKL
V_TRIKL
V_UVL
∆V_UVL
V_ASD
f_OSC
D
Current Mode Charge Current
Trickle Charge Current
Trickle Charge Threshold
V_IN Undervoltage Lockout Voltage
V_IN Undervoltage Lockout Hysteresis
Automatic Shutdown Threshold
Voltage
Oscillator Frequency
R_PROG = 549Ω, V_BAT = 3.5V
R_PROG = 1.10k, V_BAT = 3.5V
Shutdown, EN = V_IN
V_BAT = 2V
V_BAT Rising
V_BAT Falling
V_IN Rising, Measured from V_INSENSE to GNDSENS
Measured from V_INSENSE to GNDSENS
V_INSENSE – V_BATSENS Rising (Turn-On), V_BATSENSE = 4V
V_INSENSE – V_BATSENS Falling (Turn-Off), V_BATSENSE = 4V
Maximum Duty Factor
1.8
2
2.2
0.9
1
1.1
±5
35
50
65
3.05
3.1
3.20
2.85
3.0
3.05
2.7
2.82
100
200 250 300
15
30
60
1.3
1.5
1.7
100
R_PFET R_DS(ON) of P-Channel MOSFET
Measured from PV_IN to SW
127
R_NFET R_DS(ON) of N-Channel MOSFET
Measured from SW to PGND
121
2
UNITS
V
mA
µA
V
V
A
A
µA
mA
V
V
V
mV
mV
mV
MHz
%
mΩ
mΩ
4001f