LM3632A Datasheet, PDF (6/64 Pages) Texas Instruments – Single-Chip Backlight With Bias Power and 1.5-A Flash LED Driver

LM3632A
SNVSA63A – APRIL 2015 – REVISED SEPTEMBER 2015
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Electrical Characteristics (continued)
Unless otherwise specified, limits apply over the full operating ambient temperature range (−40°C ≤ T_A ≤ 85°C), V_IN = 3.7 V,
V_VPOS = 5.5 V, V_VNEG = –5.4 V, V_{LCM_OUT} = 6 V.
PARAMETER
TEST CONDITION
MIN
TYP
MAX UNIT
R_{DSON_LCMBST}
High-side MOSFET on
resistance
Low-side MOSFET on
Resistance
V_IN = V_GS = 5 V, T_A = 25°C
V_IN = V_GS = 5 V, T_A = 25°C
170
mΩ
290
EFF_LCMBST
Efficiency ⁽²⁾
V_{LCM_OUT} = 6 V, 5 mA < I_LCMBST < 100
mA
92%
t_{ST_LCMBST}
Start-up time (LCM_OUT),
V_{LCM_OUT} = 10% to 90% ⁽³⁾
DISPLAY BIAS POSITIVE OUTPUT (VPOS)
C_{LCM_BST} = 10 µF
1000 µs
Programmable output voltage
range
4
6V
Output voltage step size
50
mV
Output voltage accuracy
Output voltage = 5.4 V
–1.5%
1.5%
V_VPOS
V_IN + 500 mVp-p AC square wave, Tr =
VPOS line transient response ⁽³⁾ 100 mV/µs, 200 Hz, I_LOAD = 25 mA, C_IN
–50
= 10 µF
50 mV
I_{MAX_VPOS}
I_{CL_VPOS}
I_{RUSH_PK_VPOS}
V_{DO_VPOS}
t_{ST_VPOS}
VPOS load transient response ⁽³⁾
0 to 50 mA load transient, C_VPOS = 10
µF
DC load regulation ⁽³⁾
0 mA ≤ I_VPOS ≤ 50 mA
Maximum output current
Output current limit
Peak start-up inrush current ⁽³⁾
VPOS dropout voltage ⁽⁴⁾
Start-up time VPOS, V_VPOS =
10% to 90% ⁽³⁾
V_{LCM_OUT} = 6.3 V, V_POS = 5.8 V, C_VPOS
= 10 µF
I_VPOS = 50 mA, V_VPOS = 5.5 V
C_VPOS = 10 µF
500-µs setting
800-µs setting
–50
50 mV
20 mV
50
mA
80
mA
250 mA
100 mV
500
µs
800
R_{PD_VPOS}
Output pull-down resistor
(VPOS)
VPOS disabled
30
80
110 Ω
DISPLAY BIAS NEGATIVE OUTPUT (VNEG)
V_{OVP_VNEG}
LCM bias negative charge-pump Below V_VNEG output voltage target
output overvoltage protection
–250
mV
V_{SHORT_VNEG}
LCM bias negative charge-pump VNEG to CP_GND
output short circuit protection
–750
mV
Programmable output voltage
range
–6
–4 V
Output voltage step size
50
mV
Output accuracy
Output voltage = –5.4 V
–1.5%
1.5%
V_VNEG
Peak-to-peak ripple voltage⁽³⁾
VNEG line transient response⁽³⁾
I_LOAD = 5 mA & 50 mA,
C_VNEG = 10 µF
V_IN + 500 mVp-p AC square wave, 100
mV/µs 200 Hz, 12.5% duty at 5 mA
60
–50
±25
mVpp
50 mV
I_{MAX_VNEG}
I_{CL_VNEG}
VNEG load transient response⁽³⁾
Efficiency ⁽²⁾
Maximum output current⁽³⁾
Output current limit⁽³⁾
0 to 50 mA load transient,
T_RISE/FALL = 1 µs, C_VNEG = 10 µF
V_IN = 3.7 V, V_{LCM_OUT} = 5.8 V,
V_VNEG = –5.4 V, I_VNEG > 5 mA
V_IN = 3.7 V, V_{LCM_OUT} = 5.8 V,
V_VNEG = –5.4 V
92%
50
75
100 mV
mA
mA
(4) V_{IN_VPOS} – V_VPOS when V_VPOS has dropped 100 mV below target.
6
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