LTC3577EUFF#PBF Linear Technology, LTC3577EUFF#PBF Datasheet - Page 43

• Manufacturer Part Number: LTC3577EUFF#PBF
• Description: IC PWR MANAGEMENT HANDHELD 44QFN
• Manufacturer: Linear Technology

Specifications of LTC3577EUFF#PBF

• Applications: Handheld/Mobile Devices
• Voltage - Supply: 4.35 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

OPERATION
battery has returned to a valid charging temperature. A 0
in bit A0 indicates that charging has entered the end-of-
charge state (h
has been terminated. Charging can be terminated by
reaching the end of the charge timer or by a battery fault
as described previously.
I
for more details, all registers default to 0 when reset)
2
LDO and BUCK CONTOL
REGISTER
LED CONTROL
REGISTER
LED DAC REGISTER
C WRITE REGISTER MAP (see the “I
BIT
BIT
BIT
B0
B1
B2
B3
B4
B5
B6
B7
B0
B1
B2
B3
B4
B5
B6
B7
B0
B1
B2
B3
B4
B5
B6
B7
NAME
LDO1EN
LDO2EN
BK1BRST
BK2BRST
BK3BRST
SLEWCTL1
SLEWCTL2
N/A
NAME
EN
GR2
GR1
MD1
MD2
PWMC1
PWMC2
SLEWLED
NAME
DAC[0]
DAC[1]
DAC[2]
DAC[3]
DAC[4]
DAC[5]
N/A
N/A
C/10
) and is near V
ADDRESS: 00010010
SUB-ADDRESS: 00000000
FUNCTION
Enable LDO 1
Enable LDO 2
Buck1 Burst Mode Enable
Buck2 Burst Mode Enable
Buck2 Burst Mode Enable
Buck SW Slew Rate: 00 = 1ns,
01 = 2ns, 10 = 4ns, 11 = 8ns
Not Used—No Effect On Operation
ADDRESS: 00010010
SUB-ADDRESS: 00000001
FUNCTION
Enable: 1= Enable 0 = Off
Gradation GR[2:1]: 00 = 15ms, 01 = 460ms,
10 = 930ms, 11 = 1.85 Seconds
Mode MD[2:1]: 00 = CC Boost,
10 = PWM Boost, 01 = HV Boost
PWM CLK PWMC[2:1]: 00 = 8.77kHz,
01 = 4.39kHz, 10 = 2.92kHz, 11 = 2.19kHz
LED SW Slew rate: 0/1 = Fast/Slow
ADDRESS: 00010010
SUB-ADDRESS: 00000010
FUNCTION
6-Bit Log DAC Code
Not Used—No Effect On 0peration
Not Used—No Effect On 0peration
FLOAT
2
C Input Data” section
or that charging
PUSHBUTTON INTERFACE OPERATION
State Diagram/Operation
Figure 18 shows the LTC3577 pushbutton state diagram.
Upon fi rst application of power (V
internal power-on reset (POR) signal places the pushbutton
circuitry into the power-down (PDN1) state. One second
after entering the PDN1 state the pushbutton circuitry will
transition into the hard reset (HR) state. The following
events cause the state machine to transition out of HR
into the power-up (PUP1) state:
1) ON input low for 400ms (PB400MS)
2) Application of external power (EXTPWR)
3) PWR_ON input going high (PWR_ON)
LED PWM REGISTER
BIT
B0
B1
B2
B3
B4
B5
B6
B7
NAME
PWMDEN[0]
PWMDEN[1]
PWMDEN[2]
PWMDEN[3]
PWMNUM[0]
PWMNUM[1]
PWMNUM[2]
PWMNUM[3]
Figure 18. Pushbutton State Diagram
PB400MS +
EXTPWR +
PWR_ON
LTC3577/LTC3577-1
1SEC
PDN2
PUP2
POFF
ADDRESS: 00010010
SUB-ADDRESS: 00000011
FUNCTION
PWM Denominator
PWM Numerator
PWR_ON
HRST
+UVLO
HRST
5SEC
PUP1
PDN1
PON
HR
HRST
5SEC
PB400MS +
EXTPWR +
PWR_ON
BUS
1SEC
POR
, WALL or BAT) an
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