ISL6273 Datasheet, PDF (2/12 Pages) Intersil Corporation – 1.2A Low Quiescent Current 1.5MHz High Efficiency Synchronous Buck Regulator

ISL6273
Absolute Maximum Ratings (Reference to SGND)
Supply Voltage (PVIN, VCC) . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
EN, RSI, MODE, PHASE, POR . . . . . . . . . . . . . -0.3V to VCC+0.3V
FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V
Recommended Operating Conditions
PVIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Load Current Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 1.2A
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . .-40°C to 85°C
Thermal Information
Thermal Resistance (Notes 1, 2)
θ_JA (°C/W) θ_JC (°C/W)
3x3 DFN Package . . . . . . . . . . . . . .
44
5.5
Junction Temperature Range. . . . . . . . . . . . . . . . . . . -40°C to 125°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. θ_JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
2. θ_JC, “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications
Unless otherwise noted, all parameter limits are guaranteed over the recommended operating conditions and
the typical specification are measured at the following conditions: T_A = 25°C, V_PVIN = V_VCC = 3.6V, EN = VCC,
RSI = 0V, MODE = VCC, L = 1.8µH, C1 = 10µF, C2 = 10µF, I_OUT = 0A (see the Typical Application Circuit).
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
SUPPLY
VCC Undervoltage Lockout Threshold
V_UVLO Rising
Falling
-
2.5
2.7
V
2.2
2.4
-
V
Quiescent Supply Current
I_PVIN
MODE = VCC, no load at the output
MODE = SGND, no load at the output
-
25
50
µA
-
5
8
mA
Shut Down Supply Current
OUTPUT REGULATION
I_SD VCC = PVIN = 5.5V, EN = low
-
0.1
2
µA
FB Regulation Voltage
FB Bias Current
Output Voltage Accuracy
Line Regulation
Maximum Output Current
V_FB T_A = 0°C to 85°C
T_A = -40°C to 85°C
I_FB FB = 0.75V
PVIN = V_O + 0.5V to 5.5V, Io = 0 to 1.2A ,
T_A = -40°C to 85°C
PVIN = V_O + 0.5V to 5.5V (minimal 2.7V)
0.784 0.8 0.816
V
0.78
0.8
0.82
V
-
0.1
-
µA
-3
-
3
%
-
0.2
-
%/V
1.2
-
-
A
COMPENSATION
Error Amplifier Trans-conductance
Adjustable version, design info only
-
20
-
µA/V
PHASE
P-Channel MOSFET On Resistance
PVIN = 3.6V, Io = 200mA
-
0.12 0.22
Ω
PVIN = 2.7V, Io = 200mA
-
0.16 0.27
Ω
N-Channel MOSFET On Resistance
PVIN = 3.6V, Io = 200mA
-
0.11 0.22
Ω
PVIN = 2.7V, Io = 200mA
-
0.15 0.27
Ω
P-Channel MOSFET Peak Current Limit
I_PK
PHASE Maximum Duty Cycle
1.5
2.1
2.6
A
-
100
-
%
PWM Switching Frequency
PHASE Minimum On Time
f_S
T_A = -40°C to 85°C
MODE = low (forced PWM mode)
1.35
1.5
1.75 MHz
-
-
140
ns
Soft Start-Up Time
-
1.1
-
ms
2
FN9256.0
March 7, 2006