TM
MP2101 – 1.6MHz SYNCHRONOUS STEP-DOWN PLUS 200mA LDO
ELECTRICAL CHARACTERISTICS
(4)
(continued)
V
IN1/2
= V
EN1/2
= 3.6V, T
A
= +25°C, unless otherwise noted.
Parameters
SW1 PFET On Resistance
SW1 NFET On Resistance
SW1 Leakage Current
SW1 PFET Peak Current Limit
Oscillator Frequency
Linear Regulator LDO
IN2 Input Range
Regulated FB2 Voltage
FB2 Input Bias Current
OUT2 Short Circuit Foldback
OUT2 Output Current
Dropout Voltage
(5)
Condition
I
SW1
= 100mA
I
SW1
= –100mA
V
EN1
= 0V, V
IN
= 6V
V
SW1
= 0V or 6V
Duty Cycle = 100%,
Current Pulse Width < 1ms
Min
Typ
0.35
0.25
Max
Units
Ω
Ω
µA
A
MHz
V
V
nA
mA
mA
mV
–2
0.9
1.2
1.4
1.6
+2
2.0
2.0
V
IN1
0.612
0.618
+50
I
LOAD
= 10mA, V
OUT2
=V
FB2
T
A
= +25°C
–40°C
≤
T
A
≤
+85°C
V
FB2
= 0.6V
V
OUT2
= 0V
V
OUT
= 1.2V
I
LOAD
= 150mA, V
OUT2
= 1.2V
1.2
0.588
0.582
–50
200
0.600
–2
180
280
Notes:
4) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
5) The dropout voltage is equal to V
IN2
– V
OUT2
when V
OUT2
is 100mV below the nominal value.
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
Name
FB1
EN1
Description
Feedback 1. Feedback Input for the switcher output (OUT1).
Enable 1. Enable input for the switcher. Pull high to turn on the switcher; low to turn it off.
Input 1. Main input supply for both the switcher and the auxiliary low dropout (LDO) linear
IN1
regulator.
SW1
Switcher Switch Node. Output for the 800mA switcher channel.
GND
Ground.
IN2
Input 2. Input supply for the auxiliary linear regulator LDO output power device.
Output 2. Output of the 200mA LDO. The LDO is designed to be stable with an external
OUT2
minimum 1µF ceramic capacitor at 200mA of load current.
Power On Reset Open Drain Output. A high output indicates that both outputs are within
±10%
of the regulation value. A low output indicates that the output is outside of the
±10%
PWROK window. PWROK is pulled down if EN1 and/or EN2 is low. The PWROK window comparators
have a 50µs deglitch timer for the switcher and 150µs deglitch timer for the linear regulator
LDO to avoid a false trigger during load transient.
Enable 2. Enable input for the linear regulator LDO. Pull high to turn on the LDO; low to turn it
EN2
off.
FB2
Feedback 2. Feedback input for the linear regulator output (OUT2).
8
9
10
MP2101 Rev. 1.0
8/18/2006
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