2
FN9256.0
March 7, 2006
Absolute Maximum Ratings (Reference to SGND) Thermal Information
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 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 = 1.8
μH, 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 - 2.5 2.7 V
Falling 2.2 2.4 - V
Quiescent Supply Current I
PVIN
MODE = VCC, no load at the output - 25 50 μA
MODE = SGND, no load at the output - 5 8 mA
Shut Down Supply Current I
SD
VCC = PVIN = 5.5V, EN = low - 0.1 2 μA
OUTPUT REGULATION
FB Regulation Voltage V
FB
T
A
= 0°C to 85°C 0.784 0.8 0.816 V
T
A
= -40°C to 85°C 0.78 0.8 0.82 V
FB Bias Current I
FB
FB = 0.75V - 0.1 - μA
Output Voltage Accuracy PVIN = V
O
+ 0.5V to 5.5V, Io = 0 to 1.2A ,
T
A
= -40°C to 85°C
-3 - 3 %
Line Regulation PVIN = V
O
+ 0.5V to 5.5V (minimal 2.7V) - 0.2 - %/V
Maximum Output Current 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
1.5 2.1 2.6 A
PHASE Maximum Duty Cycle - 100 - %
PWM Switching Frequency f
S
T
A
= -40°C to 85°C 1.35 1.5 1.75 MHz
PHASE Minimum On Time MODE = low (forced PWM mode) - - 140 ns
Soft Start-Up Time -
1.1
-ms
ISL6273
