LQH4C100K04 MPS [Monolithic Power Systems], LQH4C100K04 Datasheet - Page 3

• Manufacturer Part Number: LQH4C100K04
• Description: 1.6MHz Synchronous Step-Down plus 200mA LDO
• Manufacturer: MPS [Monolithic Power Systems]

ELECTRICAL CHARACTERISTICS
V
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
PIN FUNCTIONS
MP2101 Rev. 1.0
8/18/2006
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
Pin #
IN1/2
10
1
2
3
4
5
6
7
8
9
= V
PWROK
EN1/2
Name
OUT2
GND
SW1
EN1
FB1
EN2
FB2
IN1
IN2
TM
= 3.6V, T
(5)
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
regulator.
Switcher Switch Node. Output for the 800mA switcher channel.
Ground.
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
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%
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
off.
Feedback 2. Feedback input for the linear regulator output (OUT2).
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
A
= +25°C, unless otherwise noted.
IN2
– V
OUT2
MP2101 – 1.6MHz SYNCHRONOUS STEP-DOWN PLUS 200mA LDO
when V
Condition
I
I
V
V
Duty Cycle = 100%,
Current Pulse Width < 1ms
I
T
–40°C ≤ T
V
V
V
I
SW1
SW1
LOAD
LOAD
A
EN1
SW1
FB2
OUT2
OUT
© 2006 MPS. All Rights Reserved.
= +25°C
OUT2
= 100mA
= –100mA
= 0.6V
= 0V, V
www.MonolithicPower.com
= 10mA, V
= 1.2V
= 150mA, V
= 0V or 6V
= 0V
is 100mV below the nominal value.
A
(4)
≤ +85°C
IN
(continued)
= 6V
OUT2
OUT2
=V
= 1.2V
FB2
0.588
0.582
Min
–50
200
0.9
1.2
1.2
–2
0.600
0.35
0.25
Typ
180
280
1.4
1.6
–2
0.612
0.618
Max
V
+50
2.0
2.0
+2
IN1
Units
MHz
mA
mA
mV
µA
nA
Ω
Ω
A
V
V
3