NCP1422LEDGEVB ON Semiconductor, NCP1422LEDGEVB Datasheet - Page 8

• Manufacturer Part Number: NCP1422LEDGEVB
• Description: EVAL BOARD FOR NCP1422LED
• Manufacturer: ON Semiconductor

Specifications of NCP1422LEDGEVB

• Design Resources: NCP1422LEDGEVB BOM NCP1422LEDGEVB Schematic NCP1422LEDEVB Gerber Files
• Current - Output / Channel: 800mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 500 ~ 700 mV
• Voltage - Input: 3.6V
• Utilized Ic / Part: NCP1421
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: NCP1422LEDEVBOS; NCP1422LEDEVBOS; NCP1422LEDGEVBOS

step−up voltage switching converter IC specially designed
for battery operated hand−held electronic products up to
800 mA loading. It integrates a Synchronous Rectifier to
improve efficiency as well as to eliminate the external
Schottky diode. High switching frequency (up to 1.2 MHz)
allows for a low profile inductor and output capacitor to be
used. Low−Battery Detector, Logic−Controlled Shutdown,
and Cycle−by−Cycle Current Limit provide value−added
features for various battery−operated applications. With all
these functions ON, the quiescent supply current is
typically only 8.5 mA. This device is available in a compact
DFN−10 package.
NCP1422 is a monolithic micropower high−frequency
100
90
80
70
60
50
1
Figure 20. Efficiency vs. Load Current
OUTPUT LOADING CURRENT, I
NCP1422
V
L = 6.8 mH
C
C
T
A
OUT
IN
OUT
= 25_C
= 22 mF
10
= 5.0 V
= 22 mF
100
90
80
70
60
50
V
IN
1
TYPICAL OPERATING CHARACTERISTICS
= 1.5 V
NCP1422
V
L = 6.8 mH
C
C
T
A
OUT
IN
OUT
DETAILED OPERATION DESCRIPTION
100
= 25_C
= 22 mF
Figure 22. Efficiency vs. Load Current
= 1.8 V
= 22 mF
OUTPUT LOADING CURRENT, I
OUT
V
IN
V
/mA
IN
= 3.3 V
= 2.5 V
10
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1000
NCP1422
V
V
8
IN
IN
= 1.5 V
= 1.2 V
PFM Regulation Scheme
output voltage is divided down and fed back to pin 1 (FB).
This voltage goes to the non−inverting input of the PFM
comparator whereas the comparator’s inverting input is
connected to the internal voltage reference, REF. A
switching cycle is initiated by the falling edge of the
comparator, at the moment the main switch (M1) is turned
ON. After the maximum ON−time (typically 0.72 mS)
elapses or the current limit is reached, M1 is turned OFF
and the synchronous switch (M2) is turned ON. The M1
OFF time is not less than the minimum OFF−time
(typically 0.12 mS), which ensures complete energy
100
From the simplified functional diagram (Figure 1), the
90
80
70
60
50
100
1
NCP1422
V
L = 6.8 mH
C
C
T
OUT
A
OUT
IN
OUT
= 25_C
= 22 mF
/mA
Figure 21. Efficiency vs. Load Current
= 3.3 V
= 22 mF
OUTPUT LOADING CURRENT, I
1000
10
V
IN
= 2.0 V
100
V
IN
OUT
= 2.5 V
V
/mA
IN
= 1.5 V
1000