Datasheet
LTC3557/LTC3557-1
2
35571fc
POWER MANAGER ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
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
(Notes 1-4)
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
450
900
90
475
950
100
500
1000
mA
mA
mA
I
BUSQ
Input Quiescent Current 1x, 5x, 10x Modes
ILIM0 = 0V, ILIM1 = 5V (Suspend Mode)
0.35
0.05 0.1
mA
mA
h
CLPROG
Ratio of Measured V
BUS
Current to CLPROG
Program Current
1x, 5x, 10x Modes 1000 mA/mA
V
CLPROG
CLPROG Servo Voltage in Current Limit 1x Mode
5x Mode
10x Mode
0.2
1.0
2.0
V
V
V
V
UVLO
V
BUS
Undervoltage Lockout Rising Threshold
Falling Threshold
3.5
3.8
3.7
3.9 V
V
28 27 26 25 24 23
8 9
TOP VIEW
29
UF PACKAGE
28-LEAD (4mm s 4mm) PLASTIC QFN
10
11 12 13 14
ILIM0
ILIM1
WALL
LDO3V3
SW1
V
IN1
FB1
GATE
PROG
NTC
V
NTC
SW3
V
IN2
SW2
CHRG
CLPROG
V
C
ACPR
V
BUS
V
OUT
BAT
MODE
EN1
EN2
EN3
FB3
FB2
RST2
16
15
17
18
19
20
21
6
7
5
4
3
2
1
22
T
JMAX
= 110°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations 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.
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3557EUF#PBF LTC3557EUF#TRPBF 3557
28-Lead (4mm × 4mm) Plastic QFN −40°C to 85°C
LTC3557EUF-1#PBF LTC3557EUF-1#TRPBF 35571
28-Lead (4mm × 4mm) Plastic QFN −40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/