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LM3279 bảng dữ liệu(PDF) 6 Page - Texas Instruments

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LM3279
SNVS970C – MARCH 2013 – REVISED OCTOBER 2014
www.ti.com
Electrical Characteristics
(1) (continued)
Limits are for TA = TJ = 25°C, and specifications apply to the LM3279 Typical Application Circuits with: PVIN = 3.8 V, VIO or
EN = 1.8 V, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Gain
Internal gain (4)
0.167 V
≤ VCON ≤ 1.4 V
3
V/V
ICON
VCON pin input leakage
EN = 3.8 V
–1
1
µA
Leakage into VOUT pin of the buck-
EN = 0, VOUT ≤ 4.2 V, VBATT ≤ 5.5 V
IOUT_LEAKAGE
5
boost
Max limits =
−30°C ≤ TJ = TA ≤ 85°C
(4)
When using analog control (EN = HIGH) to calculate VOUT, use the following equation: VOUT = VCON × 3.
6.6 System Characteristics
The following spec table entries are specified by design and verifications, providing the component values in the typical
application circuits are used: L = 1.5 µH, DFE201610C-1R5M (2016)/TOKO; CIN and COUT each = 10 µF 6.3 V,
C105A106MQ5NUNC (0402)/Samsung; PA decoupling cap emulation = 0.47 µF, GRM033R60J474ME90 (0201)/Murata.
These parameters are not verified by production testing. Typical limits are TA = 25°C. Min and Max limits apply over the
full ambient temperature range (
−30°C ≤ TA ≤ 85°C) and over the VIN range = 2.7 V to 5.5 V, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VBATT = 3.8 V, VIO = 1.8 V, RFFE write VSET = 3.42
V (VSET_CTRL = 5Fh), IOUT = 0mA
Turn-on time (time for output
TON
35
50
µs
to reach 0V
→90% × 3.4 V)
EN = L to H, VBATT = 3.8 V, VCON = 1.14 V,
IOUT = 0 mA
VBATT ≥ 3 V, VOUT = 3.8 V
750
IOUT_MAX
Max output current
mA
VBATT ≥ 3.2 V, VOUT = 4.2 V
650
Boost (% M4 on)
50%
DMAX
Maximum duty cycle
Buck (% M1 on)
100%
PFM: VOUT = 0.6V, PVIN = 3.7 V
FOSC_PFM
Internal oscillator frequency
63
kHz
IOUT = 13 mA
Half speed readback SCLK = 13 MHz, not including
CL
Load capacitance
LM3279 capacitance.
10
50
pF
TA = 25°C
CVCON
VCON input capacitance
VCON = 1V, Test frequency = 100 kHz, TA = 25°C
10
pF
VCON_LIN
VCON linearity
0.167 V
≤ VCON ≤ 1.4 V
–2.5%
2.5%
VIO
VIO I/O voltage level
1.8V Bus, TA = 25°C
1.65
1.8
1.95 V
VBATT ≥ 3.2 V, 0.6 ≤ VOUT ≤ 4.2 V,
Ripple voltage
15
50
0 mA
≤ IOUT ≤ 430 mA, TA = 25°C
VO_RIPPLE
PFM ripple
VOUT = 0.6 V, IOUT = 5mA
40
mV
Ripple voltage in mode
VBATT = 3 V to 5 V, Tr = Tf = 30s
50
transition
3.3 V
≤ VOUT ≤ 4.2 V
VBATT = 3.2 V to 4.9 V, VOUT = 3.5 V,
Line regulation
10
PWM Operation
ΔVOUT
mV
IOUT = 0 mA to 500 mA, VBATT = 3.2 V to 4.9 V,
Load regulation
20
PWM Operation
VBATT = 3.6 V to 4.2 V, Tr = Tf = 10 µs,
–100
100
VOUT = 3.5 V, RLOAD = 11.4 Ω, PWM
Line_tr
Line transient response
mV
VBATT = 3.6 V to 4.2 V, Tr = Tf = 10 µs,
–5
5
VOUT = 0.8 V, RLOAD = 20 Ω, PFM
IOUT = 1 mA to 200 mA, Tr = Tf = 1 µs,
–100
100
VBATT = 4.2 V, VOUT = 3.5 V, PWM
Load_tr
Load transient response
mV
IOUT = 10 mA to 90 mA, Tr = Tf = 1 µs,
–10
10
VBATT = 4.2 V, VOUT = 0.8 V, PFM
6
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