Datasheet

MCP1603/B/L
DS22042B-page 6  2007-2012 Microchip Technology Inc.
Output Characteristics
Adjustable Output Voltage Range V
OUT
0.8 — 4.5 V Note 2
Reference Feedback Voltage V
FB
—0.8— V
Reference Feedback Voltage
Tole rance
-3.0 — +3.0 % T
A
= -40°C to +25°C
-2.5 — +2.5 % T
A
= +25°C to +85°C
Feedback Input Bias Current I
VFB
—0.1—nA
Output Voltage Tolerance Fixed V
OUT
-3.0% V
R
+3.0% % T
A
= -40°C to +25°C, Note 3
V
OUT
-2.5 V
R
+2.5 % T
A
= +25°C to +85°C, Note 3
Line Regulation V
LINE-REG
—0.3—%/VV
IN
= V
R
+ 1V to 5.5V,
I
OUT
= 100 mA
Load Regulation V
LOAD-REG
—0.35— %V
IN
=V
R
+1.5V,
I
LOAD
=100mAto500mA
Internal Oscillator Frequency F
OSC
1.5 2.0 2.8 MHz
Start Up Time T
SS
—0.6—msT
R
= 10% to 90%
R
DSon
P-Channel R
DSon-P
—500—m I
P
=100mA
R
DSon
N-Channel R
DSon-N
—500—m I
N
= 100 mA
L
X
Pin Leakage Current I
LX
-1.0 ±0.1 1.0 µA SHDN =0V, V
IN
=5.5V,
L
X
=0V, L
X
=5.5V
Positive Current Limit Threshold +I
LX(MAX)
—860—mANote 6
TEMPERATURE SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, all limits are specified for: V
IN
+ 2.7V to 5.5V
Parameters Sym Min Typ Max Units Conditions
Temperature Ranges
Operating Junction Temperature Range T
J
-40 — +125 °C Steady State
Storage Temperature Range T
A
-65 — +150 °C
Maximum Junction Temperature T
J
— — +150 °C Transient
Package Thermal Resistances
Thermal Resistance, 5L-TSOT 
JA
— 207.4 — °C/W Typical 4-layer Board with
Internal Ground Plane
Thermal Resistance, 8L-2x3 DFN 
JA
— 68 — °C/W Typical 4-layer Board with
Internal Ground Plane and
2-Vias in Thermal Pad
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics: Unless otherwise indicated, MCP1603/L, V
IN
= SHDN = 3.6V, C
OUT
= C
IN
= 4.7 µF,
L = 4.7 µH, V
OUT
(ADJ) = 1.8V, I
OUT
=100mA, T
A
= +25°C. Boldface specifications apply over the T
A
range of -40°C
to +85°C.
Parameters Sym Min Typ Max Units Conditions
Note 1: The input voltage should be greater then the output voltage plus headroom voltage; higher load currents
increase the input voltage required for regulation. MCP1603B device requires a minimum load for
regulation. See Section 2.0, Typical Performance Curves for typical operating voltage ranges.
2: Reference Feedback Voltage Tolerance applies to adjustable output voltage setting.
3: V
R
is the output voltage setting.
4: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
temperature and the thermal resistance from junction to air (i.e. T
A
, T
J
, 
JA
). Exceeding the maximum
allowable power dissipation causes the device to initiate thermal shutdown.
5: The internal MOSFET switches have an integral diode from the L
X
pin to the V
IN
pin, and from the L
X
pin
to the GND pin. In cases where these diodes are forward-biased, the package power dissipation limits
must be adhered to. Thermal protection is not able to limit the junction temperature for these cases.
6: The current limit threshold is a cycle-by-cycle peak current limit.