SC187 datasheet(3/17 Pages) SEMTECH

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SC187

Electrical Characteristics

Exceeding the absolute maximum ratings may result in permanent damage to the device and/or device malfunction. Operation outside of the

parameters specified in the Electrical Characteristics section is not recommended.

Notes:

(1) Due to parasitic board inductance, the transient LX pin voltage at the point of measurement may appear larger than that which exists on silicon. The device is

designed to tolerate the short duration transient voltages that will appear on the LX pin due to the deadtime diode conduction, for inductor currents up to the

current limit setting of the device.

(2) Tested according to JEDEC standard JESD22-A114-B.

(3) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.

Unless specified: PVIN = AVIN = 5.0V, VOUT = 1.50V, C

IN = 22µF, COUT = 2 x 22µF; L = 1.0µH; -40°C≤ TJ ≤ +125 °C; Unless otherwise noted typical values are TA = +25 °C.

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Under-Voltage Lockout

UVLO

Rising AVIN, PVIN=AVIN

2.70

2.80

2.90

Hysteresis

300

Output Voltage Tolerance(1)

ΔV

OUT

PVIN= AVIN= 2.9 to 5.5V; I

OUT=1A

-1.5

+1.5

Current Limit

LIMIT

Peak LX current

5.0

6.0

7.0

Supply Current

OUT = 0A

Shutdown Current

SHDN

CTL3-0 = AGND

µA

High Side Switch Resistance(2)

DSON_P

LX= 100mA, TJ= 25 °C

mΩ

Low Side Switch Resistance(2)

DSON_N

LX= -100mA, TJ= 25 °C

X Leakage Current

(2)

LK(LX)

PVIN= AVIN= 5.5V; LX= 0V; CTL3-0 = AGND

µA

PVIN= AVIN= 5.5V; LX= 5.0V; CTL3-0 = AGND

-20

-1

Load Regulation

ΔV

LOAD-REG

PVIN= AVIN= 5.0V, I

OUT=800mA to 4A

±0.3

Absolute Maximum Ratings

PVIN and AVIN Supply Voltages (V) . . . . . . . . . -0.3 to +6.0

LX (V) (1). . . . . . . . . . . . . . . . . . . . . . -0.3 to PVIN +0.3V, 6V Max

VOUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to AVIN + 0.3

CTLx pins (V) . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to AVIN + 0.3

VOUT Short Circuit Duration. . . . . . . . . . . . . . . . Continuous

ESD Protection Level(2) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Recommended Operating Conditions

PVIN and AVIN Supply (V) . . . . . . . . . . . . . . . . . . 2.9 to +5.5

Maximum Output Current (A) . . . . . . . . . . . . . . . . . . . . . . 4.0

Input Capacitor (µF).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Output Capacitor (µF). . . . . . . . . . . . . . . . . . . . . 47 or 2 x 22

Output Inductor (µH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0

Thermal Information

Thermal Resistance, Junction to Ambient(3) (°C/W) . . . . 40

Thermal Resistance, Junction to Case (°C/W) . . . . . . . . . . 7

Operating Junction Temperature (°C) . . . . . . . -40 to +125

Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150

Storage Temperature Range (°C) . . . . . . . . . . . -65 to +150

Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . +260

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