LM3560 datasheet(4/48 Pages) TI1

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LM3560

SNOSB43B – SEPTEMBER 2011 – REVISED AUGUST 2013

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ELECTRICAL CHARACTERISTICS

(1) (2) (continued)

Limits in standard typeface are for TA = +25°C. Limits in boldface type apply over the full operating ambient temperature

range (

−40°C ≤ TA ≤ +85°C). Unless otherwise specified, VIN = 3.6V, VHWEN = VIN.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Output Over-

ON Threshold

4.925

5.075

VOVP

Voltage Protection

OFF Threshold

4.8

Trip Point(3)

Step-Up DC/DC Converter Specifications

PMOS Switch On-

RPMOS

IPMOS = 1A

Ω

Resistance

NMOS Switch On-

RNMOS

INMOS = 1A

Ω

Resistance

CL bits = 00, 3.0V

≤ VIN ≤ 4.2V

1.44

1.6

1.76

CL bits = 01, 3.0V

≤ VIN ≤ 4.2V

2.02

2.3

2.58

Switch Current

ICL

Limit(4)

CL bits = 10, 3.0V

≤ VIN ≤ 4.2V

2.64

3.0

3.36

CL bits = 11, 3.0V

≤ VIN ≤ 4.2V

3.17

3.6

4.03

Output Short

IOUT_SC

Circuit Current

VOUT < 2.3V

300

Limit

Message Indicator Register, bits[2:0] = 111, 3.0V

≤ VIN ≤ 4.2V,

ILED/NTC

Indicator Current

VLEDI/NTC = 2V

Comparator Trip

VTRIP

Configuration Register 1, bit4 = 1, 3.0V

≤ VIN ≤ 4.2V

0.97

1.03

Threshold

Switching

fSW

3.0V

≤ VIN ≤ 4.2V

1.8

2.2

MHz

Frequency

Timeout Duration

tTIMEOUT

3.0V

≤ VIN ≤ 4.2V

−10%

+10%

(5), (6)

Device Not Switching, VOUT = 3V

900

µA

Quiescent Supply

Device Switching, VOUT = 4.5V

1.97

Current

Indicate Mode, Message Indicator Register, bits[2:0] = 111,

590

µA

3.0V

≤ VIN ≤ 4.2V

Shutdown Supply

ISHDN

VHWEN = GND, 3.0V ≤ VIN ≤ 4.2V

0.02

1.25

Current

µA

Standby Supply

ISTBY

VHWEN = VIN , 3.0V ≤ VIN ≤ 4.2V

1.25

Current

VIN Monitor

VIN_TH

VIN Monitor Register = 0x01

2.85

2.9

2.95

Threshold

VIN Flash Monitor

VIN_FLASH_TH

VIN Monitor Register = 0x08

2.85

2.9

2.95

Threshold

Flash to Torch LED

TX_ Low to High,

Current Settling

ILED1 + ILED2 = 2A to 187.5 mA

Time

tTX

µs

Torch to Flash LED

TX_ High to Low,

Current Settling

160

ILED1 + ILED2 = 187.5mA to 2A

Time

(3)

The typical curve for Over-Voltage Protection (OVP) is measured in closed loop using the typical application circuit . The OVP value is

found by forcing an open circuit in the LED1 and LED2 path and recording the peak value of VOUT. The value given in the Electrical

Table is found in an open loop configuration by ramping the voltage at OUT until the OVP comparator trips. The closed loop data can

appear higher due to the stored energy in the inductor being dumped into the output capacitor after the OVP comparator trips. At worst

case is an open circuit condition where the output voltage can continue to rise after the OVP comparator trips by approximately

IIN×sqrt(L/COUT).

(4)

The typical curve for Current Limit is measured in closed loop using the typical application circuit by increasing IOUT until the peak

inductor current stops increasing. The value given in the Electrical Table is measured open loop and is found by forcing current into SW

until the current limit comparator threshold is reached. Closed loop data appears higher due to the delay between the comparator trip

point and the NFET turning off. This delay allows the closed loop inductor current to ramp higher after the trip point by approximately

20ns × VIN/L

(5)

Specified by design. Not production tested.

(6)

The timeout period is a divided down representation of the 2MHz clock and thus the accuracy spec is the same as the switching

frequency.

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