LTC3557 Datasheet, PDF (2/28 Pages) Linear Technology – USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

LTC3557/LTC3557-1
ABSOLUTE MAXIMUM RATINGS
(Notes 1-4)
V_BUS, V_OUT, V_IN1, V_IN2
t < 1ms and Duty Cycle < 1% .................. −0.3V to 7V
Steady State............................................. −0.3V to 6V
BAT, NTC, CHRG, WALL, V_C,
MODE, FB1, FB2, FB3, RST2........................ −0.3V to 6V
EN1, EN2, EN3 .............................. −0.3V to V_OUT + 0.3V
ILIM0, ILIM1, PROG ....................... −0.3V to V_CC + 0.3V
I_VBUS, I_VOUT, I_BAT .........................................................2A
I_SW1 .....................................................................850mA
I_SW2, I_SW3 ............................................................600mA
I_RST2, I_CHRG, I_ACPR .................................................75mA
I_CLPROG, I_PROG..........................................................2mA
Maximum Operating Junction Temperature .......... 110°C
Operating Ambient Temperature Range ... −40°C to 85°C
Storage Temperature Range................... −65°C to 125°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23 22
ILIM0 1
ILIM1 2
WALL 3
LDO3V3 4
SW1 5
V_IN1 6
FB1 7
21 GATE
20 PROG
19 NTC
29
18 V_NTC
17 SW3
16 V_IN2
15 SW2
8 9 10 11 12 13 14
UF PACKAGE
28-LEAD (4mm s 4mm) PLASTIC QFN
T_JMAX = 110°C, θ_JA = 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3557EUF#PBF
LTC3557EUF#TRPBF
3557
28-Lead (4mm × 4mm) Plastic QFN
LTC3557EUF-1#PBF
LTC3557EUF-1#TRPBF 35571
28-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
−40°C to 85°C
−40°C to 85°C
POWER MANAGER ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T_A = 25°C.
V_BUS = 5V, V_BAT = 3.8V, ILIM0 = ILIM1 = 5V, WALL = EN1 = EN2 = EN3 = 0V, R_PROG = 2k, R_CLPROG = 2.1k.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Input Power Supply
V_BUS
Input Supply Voltage
4.35
5.5
V
I_BUS(LIM) Total Input Current (Note 5)
ILIM0 = 0V, ILIM1 = 0V (1x Mode)
ILIM0 = 5V, ILIM1 = 5V (5x Mode)
ILIM0 = 5V, ILIM1 = 0V (10x Mode)
80
90
100
mA
● 450
475
500
mA
● 900
950
1000
mA
I_BUSQ
Input Quiescent Current
1x, 5x, 10x Modes
ILIM0 = 0V, ILIM1 = 5V (Suspend Mode)
0.35
mA
0.05
0.1
mA
h_CLPROG
Ratio of Measured V_BUS Current to CLPROG 1x, 5x, 10x Modes
Program Current
1000
mA/mA
V_CLPROG
CLPROG Servo Voltage in Current Limit
1x Mode
5x Mode
10x Mode
0.2
V
1.0
V
2.0
V
V_UVLO
V_BUS Undervoltage Lockout
Rising Threshold
Falling Threshold
3.8
3.9
V
3.5
3.7
V
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